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;

 

public class Student {

private int id;

private String name;

private String email;

private String address;

private Birthday birthday;

 

//setter、getter

public String toString() {

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

}

}

 

 

Birthday.java

 

package com.hoo.entity;

 

public class Birthday {

private String birthday;

 

public Birthday(String birthday) {

super ();

this .birthday = birthday;

}

//setter、getter

public Birthday() {}

 

@Override

public String toString() {

return this .birthday;

}

}

 

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;

 

import java.lang.reflect.InvocationTargetException;

import java.util.ArrayList;

import java.util.Collection;

import java.util.Date;

import java.util.HashMap;

import java.util.Iterator;

import java.util.List;

import java.util.Map;

import java.util.Set;

import net.sf.json.JSON;

import net.sf.json.JSONArray;

import net.sf.json.JSONFunction;

import net.sf.json.JSONObject;

import net.sf.json.JSONSerializer;

import net.sf.json.JsonConfig;

import net.sf.json.processors.JsonValueProcessor;

import net.sf.json.util.PropertyFilter;

import net.sf.json.xml.XMLSerializer;

import org.apache.commons.beanutils.PropertyUtils;

import org.junit.After;

import org.junit.Before;

import org.junit.Test;

import com.hoo.entity.Birthday;

import com.hoo.entity.Student;

 

/**

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

* 读取json字符串到java对象，序列化jsonObject到xml

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

* 依赖包:

* commons-beanutils.jar

* commons-collections-3.2.jar

* ezmorph-1.0.3.jar

* commons-lang.jar

* commons-logging.jar

* @author hoojo

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

* @file JsonlibTest.java

* @package com.hoo.test

* @project WebHttpUtils

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

* @email [email protected]

* @version 1.0

*/

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

public class JsonlibTest {

private JSONArray jsonArray = null;

private JSONObject jsonObject = null;

 

private Student bean = null;

 

@Before

public void init() {

jsonArray = new JSONArray();

jsonObject = new JSONObject();

 

bean = new Student();

bean.setAddress("address" );

bean.setEmail("email" );

bean.setId(1);

bean.setName("haha" );

Birthday day = new Birthday();

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

bean.setBirthday(day);

}

 

@After

public void destory() {

jsonArray = null;

jsonObject = null;

bean = null;

System.gc();

}

 

public final void fail(String string) {

System.out.println(string);

}

 

public final void failRed(String string) {

System.err.println(string);

}

 

}

 

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 ===========================*/

/**

* <b>function:</b>转Java Bean对象到JSON

* @author hoojo

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

*/

@Test

public void writeEntity2JSON() {

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

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

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

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

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

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

 

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

JsonConfig jsonConfig = new JsonConfig();

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

public Object processArrayValue(Object value, JsonConfig jsonConfig) {

if (value == null) {

return new Date();

}

return value;

}

 

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

fail("key:" + key);

return value + "##修改过的日期" ;

}

 

});

jsonObject = JSONObject.fromObject(bean, jsonConfig);

 

fail(jsonObject.toString());

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

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

fail(student.toString());

 

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

jsonConfig.setJsonPropertyFilter(new PropertyFilter() {

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

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

//忽略birthday属性

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

return true;

}

return false;

}

});

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

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

jsonConfig.setRootClass(Student.class );

jsonConfig.setJavaPropertyFilter(new PropertyFilter() {

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

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

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

value = name + "@@" ;

return true;

}

return false;

}

});

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

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

//fail(student.toString());

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

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

}

 

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==================

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

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

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

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

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

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

key:birthday

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

2010-11-22##修改过的日期

haha#1#address#null#email

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

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

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

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

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

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

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

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

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

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

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

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

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

Student:haha#0#address#null#null

 

2、 将JavaList集合转换吃JSON字符串

 

/**

* <b>function:</b>转换Java List集合到JSON

* @author hoojo

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

*/

@Test

public void writeList2JSON() {

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

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

stu.add(bean);

bean.setName("jack" );

stu.add(bean);

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

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

}

 

运行此方法后，可以看到控制台输出：

 

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

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

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

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

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

 

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

 

/**

* <b>function:</b>转Java Map对象到JSON

* @author hoojo

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

*/

@Test

public void writeMap2JSON() {

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

map.put("A" , bean);

 

bean.setName("jack" );

map.put("B" , bean);

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

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

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

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

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

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

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

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

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

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

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

}

 

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==================

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

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

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

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

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

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

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

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

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

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

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

 

4、 将更多类型转换成JSON

 

/**

* <b>function:</b> 转换更多数组类型到JSON

* @author hoojo

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

*/

@Test

public void writeObject2JSON() {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

jsonObject = new JSONObject()

.element("string" , "JSON" )

.element("integer" , "1" )

.element("double" , "2.0" )

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

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

 

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

jsonArray = new JSONArray()

.element( "JSON" )

.element( "1" )

.element( "2.0" )

.element( "true" );

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

 

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

List input = new ArrayList();

input.add("JSON" );

input.add("1" );

input.add("2.0" );

input.add("true" );

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

JsonConfig jsonConfig = new JsonConfig();

jsonConfig.setArrayMode( JsonConfig.MODE_OBJECT_ARRAY );

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

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

 

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

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

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

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

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

fail(func.getText() );

}

 

运行后结果如下：

 

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

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

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

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

[true,false,true]

[true,false,true]

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

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

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

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

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

{"json" :"is easy" }

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

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

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

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

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

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

JSON

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

param

doSomethingWithParam(param);

 

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\"}," +

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

/**

* <b>function:</b>将json字符串转化为java对象

* @author hoojo

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

*/

@Test

public void readJSON2Bean() {

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

jsonObject = JSONObject.fromObject(json);

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

fail(stu.toString());

}

 

运行后，结果如下：

 

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

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

 

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\"}," +

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

 

@Test

public void readJSON2DynaBean() {

try {

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

JSON jo = JSONSerializer.toJSON(json);

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

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

jsonObject = JSONObject.fromObject(json);

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

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

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

} catch (IllegalAccessException e) {

e.printStackTrace();

} catch (InvocationTargetException e) {

e.printStackTrace();

} catch (NoSuchMethodException e) {

e.printStackTrace();

}

}

 

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 =============

chian

[email protected]

tom

 

3、 将json字符串转成Java的Array数组

 

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

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

 

@Test

public void readJSON2Array() {

try {

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

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

jsonArray = JSONArray.fromObject(json);

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

Object[] os = jsonArray.toArray();

System.out.println(os.length);

 

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

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

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

System.out.println(stus.length);

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

} catch (Exception e) {

e.printStackTrace();

}

}

 

运行的结果如下：

 

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

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

1

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

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

1

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

 

4、 将JSON字符串转成Java的List集合

 

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

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

 

@Test

public void readJSON2List() {

try {

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

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

jsonArray = JSONArray.fromObject(json);

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

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

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

 

list = JSONArray.toList(jsonArray);

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

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

} catch (Exception e) {

e.printStackTrace();

}

}

 

运行后结果如下：

 

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

1

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

1

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

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

{birthday=2010-11-22}

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

]

 

5、 将json字符串转换成Collection接口

 

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

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

 

@Test

public void readJSON2Collection() {

try {

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

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

jsonArray = JSONArray.fromObject(json);

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

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

Object[] stt = con.toArray();

System.out.println(stt.length);

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

 

} catch (Exception e) {

e.printStackTrace();

}

}

 

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 ==================

1

1

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

 

6、 将json字符串转换成Map集合

 

@Test

public void readJSON2Map() {

try {

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

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

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

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

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

jsonObject = JSONObject.fromObject(json);

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

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

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

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

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

System.out.println(mapBean);

 

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

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

while (iter.hasNext()) {

String key = iter.next();

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

}

} catch (Exception e) {

e.printStackTrace();

}

}

 

运行后结果如下：

 

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

{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}

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

 

四、 JSON-lib 对 XML 的支持

 

1、 将Java对象到XML

 

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

/**

* <b>function:</b> 转换Java对象到XML

* 需要额外的jar包：xom.jar

* @author hoojo

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

*/

@Test

public void writeObject2XML() {

XMLSerializer xmlSerializer = new XMLSerializer();

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

//xmlSerializer.setElementName("bean");

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

}

 

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 ==================

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

< a >< e class ="object" >

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

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

</ e ></ a >

 

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

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

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

 

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

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

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

 

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

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

 

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

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

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

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

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

 

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

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

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

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

 

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

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

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

 

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

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

 

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

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

 

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 ==========================*/

/**

* <b>function:</b>转换xml文档到java对象

* @author hoojo

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

*/

@Test

public void readXML2Object() {

XMLSerializer xmlSerializer = new XMLSerializer();

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

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

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

fail(jsonArray.toString());

 

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

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

 

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

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

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

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

fail(bo.toString());

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

 

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

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

fail(bo.toString());

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

 

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

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

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

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

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

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

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

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

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

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

 

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

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

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

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

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

Object obj = JSONObject.toBean(jsonObject);

System.out.println(obj);

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

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

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

}

 

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 ==================

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

a

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

[Z@15856a5

true

[Z@79ed7f

true

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

1

a

true

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

true

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

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

json

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

{json=is easy}

]

is

 

3、 将xml的字符串内容，转换成Java的Array对象

 

@Test

public void testReadXml2Array() {

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

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

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

"</e>" +

"</a>" ;

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

fail(json.toString());

}

 

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]; }]

 

 

版权所有，转载请注明出处 本文出自： http://www.cnblogs.com/hoojo/archive/2011/04/21/2023805.html