JSON-lib框架，转换JSON、XML不再困难

Json-lib可以将Java对象转成json格式的字符串，也可以将Java对象转换成xml格式的文档，同样可以将json字符串转换成Java对象或是将xml字符串转换成Java对象。

一、 准备工作 

 

1、 首先要去官方下载json-lib工具包

下载地址：

http://sourceforge.net/projects/json-lib/files/json-lib/json-lib-2.4/

目前最新的是2.4的版本，本示例中使用的是v2.3；json-lib还需要以下依赖包：

jakarta commons-lang 2.5

jakarta commons-beanutils 1.8.0

jakarta commons-collections 3.2.1

jakarta commons-logging 1.1.1

ezmorph 1.0.6

官方网址：http://json-lib.sourceforge.net/

然后在工程中添加如下jar包：

 

当然你也可以用2.4的json-lib库

你可以在这里看看官方提供的示例：

http://json-lib.sourceforge.net/usage.html

由于本次介绍的示例需要junit工具，所以你还需要添加junit的jar文件，版本是4.8.2版本的，下载地址：https://github.com/KentBeck/junit/downloads

如果你还不了解JSON是什么？那么你应该可以看看http://www.json.org/json-zh.html

2、 要转换的JavaBean的代码如下：

package com.hoo.entity;

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public class Student {

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    private int id;

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    private String name;

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    private String email;

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    private String address;

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    private Birthday birthday;

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    //setter、getter

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    public String toString() {

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        return this.name + "#" + this.id + "#" + this.address + "#" + this.birthday + "#" + this.email;

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    }

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}

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Birthday.java

package com.hoo.entity;

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public class Birthday {

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    private String birthday;

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    public Birthday(String birthday) {

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        super();

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        this.birthday = birthday;

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    }

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    //setter、getter

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    public Birthday() {}

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    @Override

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    public String toString() {

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        return this.birthday;

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    }

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}

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注意，上面的getter、setter方法省略了，自己构建下。

3、 新建JsonlibTest测试类，基本代码如下：

package com.hoo.test;

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import java.lang.reflect.InvocationTargetException;

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import java.util.ArrayList;

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import java.util.Collection;

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import java.util.Date;

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import java.util.HashMap;

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import java.util.Iterator;

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import java.util.List;

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import java.util.Map;

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import java.util.Set;

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import net.sf.json.JSON;

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import net.sf.json.JSONArray;

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import net.sf.json.JSONFunction;

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import net.sf.json.JSONObject;

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import net.sf.json.JSONSerializer;

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import net.sf.json.JsonConfig;

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import net.sf.json.processors.JsonValueProcessor;

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import net.sf.json.util.PropertyFilter;

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import net.sf.json.xml.XMLSerializer;

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import org.apache.commons.beanutils.PropertyUtils;

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import org.junit.After;

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import org.junit.Before;

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import org.junit.Test;

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import com.hoo.entity.Birthday;

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import com.hoo.entity.Student;

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/**

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 * <b>function:</b> 用json-lib转换java对象到JSON字符串

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 * 读取json字符串到java对象，序列化jsonObject到xml

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 * json-lib-version: json-lib-2.3-jdk15.jar

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 * 依赖包: 

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 * commons-beanutils.jar

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 * commons-collections-3.2.jar

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 * ezmorph-1.0.3.jar

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 * commons-lang.jar

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 * commons-logging.jar

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 * @author hoojo

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 * @createDate Nov 28, 2010 2:28:39 PM

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 * @file JsonlibTest.java

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 * @package com.hoo.test

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 * @project WebHttpUtils

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 * @blog http://blog.csdn.net/IBM_hoojo

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 * @email [email protected]

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 * @version 1.0

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 */

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@SuppressWarnings({ "deprecation", "unchecked" })

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public class JsonlibTest {

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    private JSONArray jsonArray = null;

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    private JSONObject jsonObject = null;

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    private Student bean = null;

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    @Before

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    public void init() {

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        jsonArray = new JSONArray(); 

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        jsonObject = new JSONObject(); 

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        bean = new Student();

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        bean.setAddress("address");

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        bean.setEmail("email");

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        bean.setId(1);

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        bean.setName("haha");

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        Birthday day = new Birthday();

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        day.setBirthday("2010-11-22");

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        bean.setBirthday(day);

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    }

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    @After

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    public void destory() {

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        jsonArray = null;

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        jsonObject = null;

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        bean = null;

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        System.gc();

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    }

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    public final void fail(String string) {

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        System.out.println(string);

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    }

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    public final void failRed(String string) {

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        System.err.println(string);

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    }

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}

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上面的init会在每个方法之前运行，destory会在每个方法完成后执行。分别用到了junit的@Before、@After注解，如果你对junit的这些注解不是很了解，可以看看junit官方的测试用例的example和doc；

JSONObject是将Java对象转换成一个json的Object形式，JSONArray是将一个Java对象转换成json的Array格式。

那什么是json的Object形式、Array形式？

用通俗易懂的方法将，所谓的json的Object形式就是一个花括号里面存放的如JavaMap的键值对，如：{name:’hoojo’, age: 24}；

那么json的Array形式呢？

就是中括号，括起来的数组。如：[ ‘json’, true, 22]；

如果你还想了解更多json方面的知识，请看：http://www.json.org/json-zh.html

除了上面的JSONArray、JSONObject可以将Java对象转换成JSON或是相反，将JSON字符串转换成Java对象，还有一个对象也可以完成上面的功能，它就是JSONSerializer；下面我们就来看看它们是怎么玩转Java对象和JSON的。

二、 Java对象序列化成JSON对象

1、 将JavaObject转换吃JSON字符串

在JsonlibTest中添加如下代码：

/*=========================Java Object >>>> JSON String ===========================*/

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/**

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 * <b>function:</b>转Java Bean对象到JSON

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 * @author hoojo

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 * @createDate Nov 28, 2010 2:35:54 PM

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 */

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@Test

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public void writeEntity2JSON() {

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    fail("==============Java Bean >>> JSON Object==================");

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    fail(JSONObject.fromObject(bean).toString());

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    fail("==============Java Bean >>> JSON Array==================");

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    fail(JSONArray.fromObject(bean).toString());//array会在最外层套上[]

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    fail("==============Java Bean >>> JSON Object ==================");

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    fail(JSONSerializer.toJSON(bean).toString());

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    fail("========================JsonConfig========================");

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    JsonConfig jsonConfig = new JsonConfig();   

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    jsonConfig.registerJsonValueProcessor(Birthday.class, new JsonValueProcessor() {

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        public Object processArrayValue(Object value, JsonConfig jsonConfig) {

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            if (value == null) {

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                return new Date();

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            }

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            return value;

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        }

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        public Object processObjectValue(String key, Object value, JsonConfig jsonConfig) {

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            fail("key:" + key);

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            return value + "##修改过的日期";

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        }

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    });

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    jsonObject = JSONObject.fromObject(bean, jsonConfig);

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    fail(jsonObject.toString());

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    Student student = (Student) JSONObject.toBean(jsonObject, Student.class);

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    fail(jsonObject.getString("birthday"));

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    fail(student.toString());

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    fail("#####################JsonPropertyFilter############################");

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    jsonConfig.setJsonPropertyFilter(new PropertyFilter() {

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        public boolean apply(Object source, String name, Object value) {

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            fail(source + "%%%" + name + "--" + value);

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            //忽略birthday属性

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            if (value != null && Birthday.class.isAssignableFrom(value.getClass())) {

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                return true;

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            }

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            return false;

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        }

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    });  

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    fail(JSONObject.fromObject(bean, jsonConfig).toString());

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    fail("#################JavaPropertyFilter##################");

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    jsonConfig.setRootClass(Student.class);   

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    jsonConfig.setJavaPropertyFilter(new PropertyFilter() {

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        public boolean apply(Object source, String name, Object value) {

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            fail(name + "@" + value + "#" + source);

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            if ("id".equals(name) || "email".equals(name)) {

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                value = name + "@@";

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                return true;

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            }

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            return false;

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        }

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    });   

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    //jsonObject = JSONObject.fromObject(bean, jsonConfig);

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    //student = (Student) JSONObject.toBean(jsonObject, Student.class);

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    //fail(student.toString());

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    student = (Student) JSONObject.toBean(jsonObject, jsonConfig);

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    fail("Student:" + student.toString());

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}

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fromObject将Java对象转换成json字符串，toBean将json对象转换成Java对象；

上面方法值得注意的是使用了JsonConfig这个对象，这个对象可以在序列化的时候对JavaObject的数据进行处理、过滤等

上面的jsonConfig的registerJsonValueProcessor方法可以完成对象值的处理和修改，比如处理生日为null时，给一个特定的值。同样setJsonPropertyFilter和setJavaPropertyFilter都是完成对转换后的值的处理。

运行上面的代码可以在控制台看到如下结果：

==============Java Bean >>> JSON Object==================

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{"address":"address","birthday":{"birthday":"2010-11-22"},"email":"email","id":1,"name":"haha"}

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==============Java Bean >>> JSON Array==================

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[{"address":"address","birthday":{"birthday":"2010-11-22"},"email":"email","id":1,"name":"haha"}]

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==============Java Bean >>> JSON Object ==================

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{"address":"address","birthday":{"birthday":"2010-11-22"},"email":"email","id":1,"name":"haha"}

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========================JsonConfig========================

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key:birthday

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{"address":"address","birthday":"2010-11-22##修改过的日期","email":"email","id":1,"name":"haha"}

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2010-11-22##修改过的日期

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haha#1#address#null#email

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#####################JsonPropertyFilter############################

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haha#1#address#2010-11-22#email%%%address--address

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haha#1#address#2010-11-22#email%%%birthday--2010-11-22

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haha#1#address#2010-11-22#email%%%email--email

<!--CRLF-->

haha#1#address#2010-11-22#email%%%id--1

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haha#1#address#2010-11-22#email%%%name--haha

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{"address":"address","email":"email","id":1,"name":"haha"}

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#################JavaPropertyFilter##################

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address@address#null#0#null#null#null

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birthday@2010-11-22##修改过的日期#null#0#address#null#null

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email@email#null#0#address#null#null

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id@1#null#0#address#null#null

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name@haha#null#0#address#null#null

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Student:haha#0#address#null#null

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2、 将JavaList集合转换吃JSON字符串

/**

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 * <b>function:</b>转换Java List集合到JSON

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 * @author hoojo

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 * @createDate Nov 28, 2010 2:36:15 PM

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 */

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@Test

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public void writeList2JSON() {

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    fail("==============Java List >>> JSON Array==================");

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    List<Student> stu = new ArrayList<Student>();

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    stu.add(bean);

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    bean.setName("jack");

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    stu.add(bean);

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    fail(JSONArray.fromObject(stu).toString());

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    fail(JSONSerializer.toJSON(stu).toString());

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}

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运行此方法后，可以看到控制台输出：

==============Java List >>> JSON Array==================

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[{"address":"address","birthday":{"birthday":"2010-11-22"},"email":"email","id":1,"name":"jack"},

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{"address":"address","birthday":{"birthday":"2010-11-22"},"email":"email","id":1,"name":"jack"}]

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[{"address":"address","birthday":{"birthday":"2010-11-22"},"email":"email","id":1,"name":"jack"},

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{"address":"address","birthday":{"birthday":"2010-11-22"},"email":"email","id":1,"name":"jack"}]

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如果你是转换List集合，一定得用JSONArray或是JSONSrializer提供的序列化方法。如果你用 JSONObject.fromObject方法转换List会出现异常，通常使用JSONSrializer这个JSON序列化的方法，它会自动识别你传递的对象的类型，然后转换成相应的JSON字符串。

3、 将Map集合转换成JSON对象

/**

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 * <b>function:</b>转Java Map对象到JSON

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 * @author hoojo

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 * @createDate Nov 28, 2010 2:37:35 PM

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 */

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@Test

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public void writeMap2JSON() {

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    Map<String, Object> map = new HashMap<String, Object>();

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    map.put("A", bean);

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    bean.setName("jack");

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    map.put("B", bean);

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    map.put("name", "json");

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    map.put("bool", Boolean.TRUE);

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    map.put("int", new Integer(1));

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    map.put("arr", new String[] { "a", "b" });

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    map.put("func", "function(i){ return this.arr[i]; }"); 

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    fail("==============Java Map >>> JSON Object==================");

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    fail(JSONObject.fromObject(map).toString());

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    fail("==============Java Map >>> JSON Array ==================");

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    fail(JSONArray.fromObject(map).toString());

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    fail("==============Java Map >>> JSON Object==================");

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    fail(JSONSerializer.toJSON(map).toString());

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}

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上面的Map集合有JavaBean、String、Boolean、Integer、以及Array和js的function函数的字符串。

运行上面的程序，结果如下：

==============Java Map >>> JSON Object==================

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{"arr":["a","b"],"A":{"address":"address","birthday":{"birthday":"2010-11-22"},"email":"email","id":1,"name":"jack"},"int":1,

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"B":{"address":"address","birthday":{"birthday":"2010-11-22"},"email":"email","id":1,"name":"jack"},"name":"json",

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"func":function(i){ return this.arr[i]; },"bool":true}

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==============Java Map >>> JSON Array ==================

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[{"arr":["a","b"],"A":{"address":"address","birthday":{"birthday":"2010-11-22"},"email":"email","id":1,"name":"jack"},"int":1,

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"B":{"address":"address","birthday":{"birthday":"2010-11-22"},"email":"email","id":1,"name":"jack"},"name":"json",

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"func":function(i){ return this.arr[i]; },"bool":true}]

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==============Java Map >>> JSON Object==================

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{"arr":["a","b"],"A":{"address":"address","birthday":{"birthday":"2010-11-22"},"email":"email","id":1,"name":"jack"},"int":1,

<!--CRLF-->

"B":{"address":"address","birthday":{"birthday":"2010-11-22"},"email":"email","id":1,"name":"jack"},"name":"json",

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"func":function(i){ return this.arr[i]; },"bool":true}

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4、 将更多类型转换成JSON

/**

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 * <b>function:</b>  转换更多数组类型到JSON

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 * @author hoojo

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 * @createDate Nov 28, 2010 2:39:19 PM

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 */

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@Test

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public void writeObject2JSON() {

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    String[] sa = {"a", "b", "c"};

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    fail("==============Java StringArray >>> JSON Array ==================");

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    fail(JSONArray.fromObject(sa).toString());

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    fail(JSONSerializer.toJSON(sa).toString());

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    fail("==============Java boolean Array >>> JSON Array ==================");

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    boolean[] bo = { true, false, true };

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    fail(JSONArray.fromObject(bo).toString());

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    fail(JSONSerializer.toJSON(bo).toString());

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    Object[] o = { 1, "a", true, 'A', sa, bo };

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    fail("==============Java Object Array >>> JSON Array ==================");

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    fail(JSONArray.fromObject(o).toString());

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    fail(JSONSerializer.toJSON(o).toString());

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    fail("==============Java String >>> JSON ==================");

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    fail(JSONArray.fromObject("['json','is','easy']").toString());

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    fail(JSONObject.fromObject("{'json':'is easy'}").toString());

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    fail(JSONSerializer.toJSON("['json','is','easy']").toString());

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    fail("==============Java JSONObject >>> JSON ==================");

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    jsonObject = new JSONObject()   

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        .element("string", "JSON")

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        .element("integer", "1")

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        .element("double", "2.0")

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        .element("boolean", "true");  

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    fail(JSONSerializer.toJSON(jsonObject).toString());

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    fail("==============Java JSONArray >>> JSON ==================");

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    jsonArray = new JSONArray()   

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        .element( "JSON" )   

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        .element( "1" )   

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        .element( "2.0" )   

<!--CRLF-->

        .element( "true" ); 

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    fail(JSONSerializer.toJSON(jsonArray).toString());

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    fail("==============Java JSONArray JsonConfig#setArrayMode >>> JSON ==================");

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    List input = new ArrayList();   

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    input.add("JSON");

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    input.add("1");

<!--CRLF-->

    input.add("2.0");

<!--CRLF-->

    input.add("true");   

<!--CRLF-->

    JSONArray jsonArray = (JSONArray) JSONSerializer.toJSON( input );   

<!--CRLF-->

    JsonConfig jsonConfig = new JsonConfig();   

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    jsonConfig.setArrayMode( JsonConfig.MODE_OBJECT_ARRAY );   

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    Object[] output = (Object[]) JSONSerializer.toJava(jsonArray, jsonConfig);

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    System.out.println(output[0]);

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    fail("==============Java JSONFunction >>> JSON ==================");

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    String str = "{'func': function( param ){ doSomethingWithParam(param); }}";   

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    JSONObject jsonObject = (JSONObject) JSONSerializer.toJSON(str);   

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    JSONFunction func = (JSONFunction) jsonObject.get("func");   

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    fail(func.getParams()[0]);   

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    fail(func.getText() );   

<!--CRLF-->

}

<!--CRLF-->

运行后结果如下：

==============Java StringArray >>> JSON Array ==================

<!--CRLF-->

["a","b","c"]

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["a","b","c"]

<!--CRLF-->

==============Java boolean Array >>> JSON Array ==================

<!--CRLF-->

[true,false,true]

<!--CRLF-->

[true,false,true]

<!--CRLF-->

==============Java Object Array >>> JSON Array ==================

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[1,"a",true,"A",["a","b","c"],[true,false,true]]

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[1,"a",true,"A",["a","b","c"],[true,false,true]]

<!--CRLF-->

==============Java String >>> JSON ==================

<!--CRLF-->

["json","is","easy"]

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{"json":"is easy"}

<!--CRLF-->

["json","is","easy"]

<!--CRLF-->

==============Java JSONObject >>> JSON ==================

<!--CRLF-->

{"string":"JSON","integer":"1","double":"2.0","boolean":"true"}

<!--CRLF-->

==============Java JSONArray >>> JSON ==================

<!--CRLF-->

["JSON","1","2.0","true"]

<!--CRLF-->

==============Java JSONArray JsonConfig#setArrayMode >>> JSON ==================

<!--CRLF-->

JSON

<!--CRLF-->

==============Java JSONFunction >>> JSON ==================

<!--CRLF-->

param

<!--CRLF-->

doSomethingWithParam(param);

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这里还有一个JSONFunction的对象，可以转换JavaScript的function。可以获取方法参数和方法体。同时，还可以用JSONObject、JSONArray构建Java对象，完成Java对象到JSON字符串的转换。

三、 JSON对象反序列化成Java对象

1、 将json字符串转成Java对象

private String json = "{\"address\":\"chian\",\"birthday\":{\"birthday\":\"2010-11-22\"}," +

<!--CRLF-->

        "\"email\":\"[email protected]\",\"id\":22,\"name\":\"tom\"}";

<!--CRLF-->

/**

<!--CRLF-->

 * <b>function:</b>将json字符串转化为java对象

<!--CRLF-->

 * @author hoojo

<!--CRLF-->

 * @createDate Nov 28, 2010 3:01:16 PM

<!--CRLF-->

 */

<!--CRLF-->

@Test

<!--CRLF-->

public void readJSON2Bean() {

<!--CRLF-->

    fail("==============JSON Object String >>> Java Bean ==================");

<!--CRLF-->

    jsonObject = JSONObject.fromObject(json);

<!--CRLF-->

    Student stu = (Student) JSONObject.toBean(jsonObject, Student.class);

<!--CRLF-->

    fail(stu.toString());

<!--CRLF-->

}

<!--CRLF-->

运行后，结果如下：

==============JSON Object String >>> Java Bean ==================

<!--CRLF-->

tom#22#chian#2010-11-22#[email protected]

<!--CRLF-->

2、 将json字符串转换成动态Java对象(MorphDynaBean)

private String json = "{\"address\":\"chian\",\"birthday\":{\"birthday\":\"2010-11-22\"},"+

<!--CRLF-->

        "\"email\":\"[email protected]\",\"id\":22,\"name\":\"tom\"}";

<!--CRLF-->

<!--CRLF-->

@Test

<!--CRLF-->

public void readJSON2DynaBean() {

<!--CRLF-->

    try {

<!--CRLF-->

        fail("==============JSON Object String >>> Java MorphDynaBean ==================");

<!--CRLF-->

        JSON jo = JSONSerializer.toJSON(json);

<!--CRLF-->

        Object o = JSONSerializer.toJava(jo);//MorphDynaBean

<!--CRLF-->

        fail(PropertyUtils.getProperty(o, "address").toString());

<!--CRLF-->

        jsonObject = JSONObject.fromObject(json);

<!--CRLF-->

        fail(jsonObject.getString("email"));

<!--CRLF-->

        o = JSONSerializer.toJava(jsonObject);//MorphDynaBean

<!--CRLF-->

        fail(PropertyUtils.getProperty(o, "name").toString());

<!--CRLF-->

    } catch (IllegalAccessException e) {

<!--CRLF-->

        e.printStackTrace();

<!--CRLF-->

    } catch (InvocationTargetException e) {

<!--CRLF-->

        e.printStackTrace();

<!--CRLF-->

    } catch (NoSuchMethodException e) {

<!--CRLF-->

        e.printStackTrace();

<!--CRLF-->

    }

<!--CRLF-->

}

<!--CRLF-->

转换后的对象Object是一个MorphDynaBean的动态JavaBean，通过PropertyUtils可以获得指定的属性的值。

运行后结果如下：

==============JSON Object String >>> Java MorphDynaBean =============

<!--CRLF-->

chian

<!--CRLF-->

[email protected]

<!--CRLF-->

tom

<!--CRLF-->

3、 将json字符串转成Java的Array数组

private String json = "{\"address\":\"chian\",\"birthday\":{\"birthday\":\"2010-11-22\"},"+

<!--CRLF-->

        "\"email\":\"[email protected]\",\"id\":22,\"name\":\"tom\"}";

<!--CRLF-->

<!--CRLF-->

@Test

<!--CRLF-->

public void readJSON2Array() {

<!--CRLF-->

    try {

<!--CRLF-->

        fail("==============JSON Arry String >>> Java Array ==================");

<!--CRLF-->

        json = "[" + json + "]";

<!--CRLF-->

        jsonArray = JSONArray.fromObject(json);

<!--CRLF-->

        fail("#%%%" + jsonArray.get(0).toString());

<!--CRLF-->

        Object[] os = jsonArray.toArray();

<!--CRLF-->

        System.out.println(os.length);

<!--CRLF-->

<!--CRLF-->

        fail(JSONArray.fromObject(json).join(""));

<!--CRLF-->

        fail(os[0].toString());

<!--CRLF-->

        Student[] stus = (Student[]) JSONArray.toArray(jsonArray, Student.class);

<!--CRLF-->

        System.out.println(stus.length);

<!--CRLF-->

        System.out.println(stus[0]);

<!--CRLF-->

    } catch (Exception e) {

<!--CRLF-->

        e.printStackTrace();

<!--CRLF-->

    }

<!--CRLF-->

}

<!--CRLF-->

运行的结果如下：

==============JSON Arry String >>> Java Array ==================

<!--CRLF-->

#%%%{"address":"chian","birthday":{"birthday":"2010-11-22"},"email":"[email protected]","id":22,"name":"tom"}

<!--CRLF-->

1

<!--CRLF-->

{"address":"chian","birthday":{"birthday":"2010-11-22"},"email":"[email protected]","id":22,"name":"tom"}

<!--CRLF-->

{"address":"chian","birthday":{"birthday":"2010-11-22"},"email":"[email protected]","id":22,"name":"tom"}

<!--CRLF-->

1

<!--CRLF-->

tom#22#chian#2010-11-22#[email protected]

<!--CRLF-->

4、 将JSON字符串转成Java的List集合

private String json = "{\"address\":\"chian\",\"birthday\":{\"birthday\":\"2010-11-22\"},"+

<!--CRLF-->

        "\"email\":\"[email protected]\",\"id\":22,\"name\":\"tom\"}";

<!--CRLF-->

<!--CRLF-->

@Test

<!--CRLF-->

public void readJSON2List() {

<!--CRLF-->

    try {

<!--CRLF-->

        fail("==============JSON Arry String >>> Java List ==================");

<!--CRLF-->

        json = "[" + json + "]";

<!--CRLF-->

        jsonArray = JSONArray.fromObject(json);

<!--CRLF-->

        List<Student> list = JSONArray.toList(jsonArray, Student.class);

<!--CRLF-->

        System.out.println(list.size());

<!--CRLF-->

        System.out.println(list.get(0));

<!--CRLF-->

<!--CRLF-->

        list = JSONArray.toList(jsonArray);

<!--CRLF-->

        System.out.println(list.size());

<!--CRLF-->

        System.out.println(list.get(0));//MorphDynaBean

<!--CRLF-->

    } catch (Exception e) {

<!--CRLF-->

        e.printStackTrace();

<!--CRLF-->

    }

<!--CRLF-->

}

<!--CRLF-->

运行后结果如下：

==============JSON Arry String >>> Java List ==================

<!--CRLF-->

1

<!--CRLF-->

tom#22#chian#2010-11-22#[email protected]

<!--CRLF-->

1

<!--CRLF-->

net.sf.ezmorph.bean.MorphDynaBean@141b571[

<!--CRLF-->

  {id=22, birthday=net.sf.ezmorph.bean.MorphDynaBean@b23210[

<!--CRLF-->

  {birthday=2010-11-22}

<!--CRLF-->

], address=chian, [email protected], name=tom}

<!--CRLF-->

]

<!--CRLF-->

5、 将json字符串转换成Collection接口

private String json = "{\"address\":\"chian\",\"birthday\":{\"birthday\":\"2010-11-22\"},"+

<!--CRLF-->

        "\"email\":\"[email protected]\",\"id\":22,\"name\":\"tom\"}";

<!--CRLF-->

<!--CRLF-->

@Test

<!--CRLF-->

public void readJSON2Collection() {

<!--CRLF-->

    try {

<!--CRLF-->

        fail("==============JSON Arry String >>> Java Collection ==================");

<!--CRLF-->

        json = "[" + json + "]";

<!--CRLF-->

        jsonArray = JSONArray.fromObject(json);

<!--CRLF-->

        Collection<Student> con = JSONArray.toCollection(jsonArray, Student.class);

<!--CRLF-->

        System.out.println(con.size());

<!--CRLF-->

        Object[] stt = con.toArray();

<!--CRLF-->

        System.out.println(stt.length);

<!--CRLF-->

        fail(stt[0].toString());

<!--CRLF-->

<!--CRLF-->

    } catch (Exception e) {

<!--CRLF-->

        e.printStackTrace();

<!--CRLF-->

    }

<!--CRLF-->

}

<!--CRLF-->

刚才上面的将json转换成list提示该方法过时，这里有toCollection，可以用此方法代替toList方法；运行后结果如下：

==============JSON Arry String >>> Java Collection ==================

<!--CRLF-->

1

<!--CRLF-->

1

<!--CRLF-->

tom#22#chian#2010-11-22#[email protected]

<!--CRLF-->

6、 将json字符串转换成Map集合

@Test

<!--CRLF-->

public void readJSON2Map() {

<!--CRLF-->

    try {

<!--CRLF-->

        fail("==============JSON Arry String >>> Java Map ==================");

<!--CRLF-->

        json = "{\"arr\":[\"a\",\"b\"],\"A\":{\"address\":\"address\",\"birthday\":{\"birthday\":\"2010-11-22\"},"+

<!--CRLF-->

        "\"email\":\"email\",\"id\":1,\"name\":\"jack\"},\"int\":1,"+

<!--CRLF-->

        "\"B\":{\"address\":\"address\",\"birthday\":{\"birthday\":\"2010-11-22\"},"+

<!--CRLF-->

        "\"email\":\"email\",\"id\":1,\"name\":\"jack\"},\"name\":\"json\",\"bool\":true}";

<!--CRLF-->

        jsonObject = JSONObject.fromObject(json);

<!--CRLF-->

        Map<String, Class<?>> clazzMap = new HashMap<String, Class<?>>();

<!--CRLF-->

        clazzMap.put("arr", String[].class);

<!--CRLF-->

        clazzMap.put("A", Student.class);

<!--CRLF-->

        clazzMap.put("B", Student.class);

<!--CRLF-->

        Map<String, ?> mapBean = (Map) JSONObject.toBean(jsonObject, Map.class, clazzMap);

<!--CRLF-->

        System.out.println(mapBean);

<!--CRLF-->

<!--CRLF-->

        Set<String> set = mapBean.keySet();

<!--CRLF-->

        Iterator<String> iter = set.iterator();

<!--CRLF-->

        while (iter.hasNext()) {

<!--CRLF-->

            String key = iter.next();

<!--CRLF-->

            fail(key + ":" + mapBean.get(key).toString());

<!--CRLF-->

        }

<!--CRLF-->

    } catch (Exception e) {

<!--CRLF-->

        e.printStackTrace();

<!--CRLF-->

    }

<!--CRLF-->

}

<!--CRLF-->

运行后结果如下：

==============JSON Arry String >>> Java Map ==================

<!--CRLF-->

{A=jack#1#address#2010-11-22#email, arr=[a, b], B=jack#1#address#2010-11-22#email, int=1, name=json, bool=true}

<!--CRLF-->

A:jack#1#address#2010-11-22#email

<!--CRLF-->

arr:[a, b]

<!--CRLF-->

B:jack#1#address#2010-11-22#email

<!--CRLF-->

int:1

<!--CRLF-->

name:json

<!--CRLF-->

bool:true

<!--CRLF-->

四、 JSON-lib对XML的支持

1、 将Java对象到XML

/*============================Java Object >>>>> XML ==========================*/

<!--CRLF-->

/**

<!--CRLF-->

 * <b>function:</b> 转换Java对象到XML

<!--CRLF-->

 * 需要额外的jar包：xom.jar

<!--CRLF-->

 * @author hoojo

<!--CRLF-->

 * @createDate Nov 28, 2010 2:39:55 PM

<!--CRLF-->

 */

<!--CRLF-->

@Test

<!--CRLF-->

public void writeObject2XML() {

<!--CRLF-->

    XMLSerializer xmlSerializer = new XMLSerializer();

<!--CRLF-->

    fail("==============Java String Array >>> XML ==================");

<!--CRLF-->

    //xmlSerializer.setElementName("bean");

<!--CRLF-->

    fail(xmlSerializer.write(JSONArray.fromObject(bean)));

<!--CRLF-->

    String[] sa = {"a", "b", "c"};

<!--CRLF-->

    fail("==============Java String Array >>> XML ==================");

<!--CRLF-->

    fail(xmlSerializer.write(JSONArray.fromObject(sa)));

<!--CRLF-->

    fail("==============Java boolean Array >>> XML ==================");

<!--CRLF-->

    boolean[] bo = { true, false, true };

<!--CRLF-->

    fail(xmlSerializer.write(JSONArray.fromObject(bo)));

<!--CRLF-->

    fail(xmlSerializer.write(JSONSerializer.toJSON(bo)));

<!--CRLF-->

    Object[] o = { 1, "a", true, 'A', sa, bo };

<!--CRLF-->

    fail("==============Java Object Array >>> JSON Array ==================");

<!--CRLF-->

    fail(xmlSerializer.write(JSONArray.fromObject(o)));

<!--CRLF-->

    fail(xmlSerializer.write(JSONSerializer.toJSON(o)));

<!--CRLF-->

    fail("==============Java String >>> JSON ==================");

<!--CRLF-->

    fail(xmlSerializer.write(JSONArray.fromObject("['json','is','easy']")).toString());

<!--CRLF-->

    fail(xmlSerializer.write(JSONObject.fromObject("{'json':'is easy'}")).toString());

<!--CRLF-->

    fail(xmlSerializer.write(JSONSerializer.toJSON("['json','is','easy']")).toString());

<!--CRLF-->

}

<!--CRLF-->

主要运用的是XMLSerializer的write方法，这个方法可以完成java对象到xml的转换，不过你很容易就可以看到这个xml序列化对象，需要先将java对象转成json对象，然后再将json转换吃xml文档。

运行后结果如下：

==============Java String Array >>> XML ==================

<!--CRLF-->

<?xml version="1.0" encoding="UTF-8"?>

<!--CRLF-->

<a><e class="object">

<!--CRLF-->

<address type="string">address</address><birthday class="object"><birthday type="string">2010-11-22</birthday></birthday>

<!--CRLF-->

<email type="string">email</email><id type="number">1</id><name type="string">haha</name>

<!--CRLF-->

</e></a>

<!--CRLF-->

<!--CRLF-->

==============Java String Array >>> XML ==================

<!--CRLF-->

<?xml version="1.0" encoding="UTF-8"?>

<!--CRLF-->

<a><e type="string">a</e><e type="string">b</e><e type="string">c</e></a>

<!--CRLF-->

<!--CRLF-->

==============Java boolean Array >>> XML ==================

<!--CRLF-->

<?xml version="1.0" encoding="UTF-8"?>

<!--CRLF-->

<a><e type="boolean">true</e><e type="boolean">false</e><e type="boolean">true</e></a>

<!--CRLF-->

<!--CRLF-->

<?xml version="1.0" encoding="UTF-8"?>

<!--CRLF-->

<a><e type="boolean">true</e><e type="boolean">false</e><e type="boolean">true</e></a>

<!--CRLF-->

<!--CRLF-->

==============Java Object Array >>> JSON Array ==================

<!--CRLF-->

<?xml version="1.0" encoding="UTF-8"?>

<!--CRLF-->

<a><e type="number">1</e><e type="string">a</e><e type="boolean">true</e><e type="string">A</e><e class="array">

<!--CRLF-->

<e type="string">a</e><e type="string">b</e><e type="string">c</e></e><e class="array"><e type="boolean">true</e>

<!--CRLF-->

<e type="boolean">false</e><e type="boolean">true</e></e></a>

<!--CRLF-->

<!--CRLF-->

<?xml version="1.0" encoding="UTF-8"?>

<!--CRLF-->

<a><e type="number">1</e><e type="string">a</e><e type="boolean">true</e><e type="string">A</e><e class="array">

<!--CRLF-->

<e type="string">a</e><e type="string">b</e><e type="string">c</e></e><e class="array"><e type="boolean">true</e>

<!--CRLF-->

<e type="boolean">false</e><e type="boolean">true</e></e></a>

<!--CRLF-->

<!--CRLF-->

==============Java String >>> JSON ==================

<!--CRLF-->

<?xml version="1.0" encoding="UTF-8"?>

<!--CRLF-->

<a><e type="string">json</e><e type="string">is</e><e type="string">easy</e></a>

<!--CRLF-->

<!--CRLF-->

<?xml version="1.0" encoding="UTF-8"?>

<!--CRLF-->

<o><json type="string">is easy</json></o>

<!--CRLF-->

<!--CRLF-->

<?xml version="1.0" encoding="UTF-8"?>

<!--CRLF-->

<a><e type="string">json</e><e type="string">is</e><e type="string">easy</e></a>

<!--CRLF-->

上面的节点名称有点乱，你可以通过setElementName设置节点名称

2、 将XML转换成Java对象

/*============================XML String >>>>> Java Object ==========================*/

<!--CRLF-->

/**

<!--CRLF-->

 * <b>function:</b>转换xml文档到java对象

<!--CRLF-->

 * @author hoojo

<!--CRLF-->

 * @createDate Nov 28, 2010 3:00:27 PM

<!--CRLF-->

 */

<!--CRLF-->

@Test

<!--CRLF-->

public void readXML2Object() {

<!--CRLF-->

    XMLSerializer xmlSerializer = new XMLSerializer();

<!--CRLF-->

    fail("============== XML >>>> Java String Array ==================");

<!--CRLF-->

    String[] sa = {"a", "b", "c"};

<!--CRLF-->

    jsonArray = (JSONArray) xmlSerializer.read(xmlSerializer.write(JSONArray.fromObject(sa)));

<!--CRLF-->

    fail(jsonArray.toString());

<!--CRLF-->

<!--CRLF-->

    String[] s = (String[]) JSONArray.toArray(jsonArray, String.class);

<!--CRLF-->

    fail(s[0].toString());

<!--CRLF-->

<!--CRLF-->

    fail("============== XML >>>> Java boolean Array ==================");

<!--CRLF-->

    boolean[] bo = { true, false, true };

<!--CRLF-->

    jsonArray = (JSONArray) xmlSerializer.read(xmlSerializer.write(JSONArray.fromObject(bo)));

<!--CRLF-->

    bo = (boolean[]) JSONArray.toArray(jsonArray, boolean.class);

<!--CRLF-->

    fail(bo.toString());

<!--CRLF-->

    System.out.println(bo[0]);

<!--CRLF-->

<!--CRLF-->

    jsonArray = (JSONArray) xmlSerializer.read(xmlSerializer.write(JSONSerializer.toJSON(bo)));

<!--CRLF-->

    bo = (boolean[]) JSONArray.toArray(jsonArray, boolean.class);

<!--CRLF-->

    fail(bo.toString());

<!--CRLF-->

    System.out.println(bo[0]);

<!--CRLF-->

<!--CRLF-->

    fail("==============Java Object Array >>> JSON Array ==================");

<!--CRLF-->

    Object[] o = { 1, "a", true, 'A', sa, bo };

<!--CRLF-->

    jsonArray = (JSONArray) xmlSerializer.read(xmlSerializer.write(JSONArray.fromObject(o)));

<!--CRLF-->

    System.out.println(jsonArray.getInt(0));

<!--CRLF-->

    System.out.println(jsonArray.get(1));

<!--CRLF-->

    System.out.println(jsonArray.getBoolean(2));

<!--CRLF-->

    jsonArray = (JSONArray) xmlSerializer.read(xmlSerializer.write(JSONSerializer.toJSON(o)));

<!--CRLF-->

    System.out.println(jsonArray.get(4));

<!--CRLF-->

    System.out.println(jsonArray.getJSONArray(5).get(0));

<!--CRLF-->

    System.out.println(jsonArray.get(5));

<!--CRLF-->

<!--CRLF-->

    fail("==============Java String >>> JSON ==================");

<!--CRLF-->

    jsonArray = (JSONArray) xmlSerializer.read(xmlSerializer.write(JSONArray.fromObject("['json','is','easy']")).toString());

<!--CRLF-->

    s = (String[]) JSONArray.toArray(jsonArray, String.class);

<!--CRLF-->

    fail(s[0].toString());

<!--CRLF-->

    jsonObject = (JSONObject) xmlSerializer.read(xmlSerializer.write(JSONObject.fromObject("{'json':'is easy'}")).toString());

<!--CRLF-->

    Object obj = JSONObject.toBean(jsonObject);

<!--CRLF-->

    System.out.println(obj);

<!--CRLF-->

    jsonArray = (JSONArray) xmlSerializer.read(xmlSerializer.write(JSONSerializer.toJSON("['json','is','easy']")).toString());

<!--CRLF-->

    s = (String[]) JSONArray.toArray(jsonArray, String.class);

<!--CRLF-->

    fail(s[1].toString());

<!--CRLF-->

}

<!--CRLF-->

主要运用到XMLSerializer的read方法，将xml内容读取后，转换成Java对象。运行后结果如下：

============== XML >>>> Java String Array ==================

<!--CRLF-->

["a","b","c"]

<!--CRLF-->

a

<!--CRLF-->

============== XML >>>> Java boolean Array ==================

<!--CRLF-->

[Z@15856a5

<!--CRLF-->

true

<!--CRLF-->

[Z@79ed7f

<!--CRLF-->

true

<!--CRLF-->

==============Java Object Array >>> JSON Array ==================

<!--CRLF-->

1

<!--CRLF-->

a

<!--CRLF-->

true

<!--CRLF-->

["a","b","c"]

<!--CRLF-->

true

<!--CRLF-->

["true","false","true"]

<!--CRLF-->

==============Java String >>> JSON ==================

<!--CRLF-->

json

<!--CRLF-->

net.sf.ezmorph.bean.MorphDynaBean@c09554[

<!--CRLF-->

  {json=is easy}

<!--CRLF-->

]

<!--CRLF-->

is

<!--CRLF-->

3、 将xml的字符串内容，转换成Java的Array对象

@Test

<!--CRLF-->

public void testReadXml2Array() {

<!--CRLF-->

    String str = "<a class=\"array\">" +   

<!--CRLF-->

          "<e type=\"function\" params=\"i,j\">" +  

<!--CRLF-->

          "return matrix[i][j];" +    

<!--CRLF-->

          "</e>" +  

<!--CRLF-->

        "</a>";

<!--CRLF-->

    JSONArray json = (JSONArray) new XMLSerializer().read(str);

<!--CRLF-->

    fail(json.toString());   

<!--CRLF-->

}

<!--CRLF-->

上面是一段xml字符串格式的文档，将其转换为JSONArray对象。转换后结果如下：

[function(i,j){ return matrix[i][j]; }]

<!--CRLF-->

就是一个数组；