作者：hoojo
出处： http://www.cnblogs.com/hoojo/archive/2011/04/21/2023805.html
blog：http://blog.csdn.net/IBM_hoojo
本文版权归作者和博客园共有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。
JSON-lib框架，转换JSON、XML不再困难【回钦波】
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);
}
}
下面是我个人写的测试类：
package json_test;
import net.sf.json.JSON;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import net.sf.json.JSONSerializer;
import org.junit.After;
public class JsonTest {
private JSONArray jsonArray = null;
private JSONObject jsonObject = null;
private Student bean = null;
public static void main(String args[]){
JsonTest jt = new JsonTest();
jt.init();
}
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);
System.out.println( JSONObject.fromObject(bean));
System.out.println( "----------------------------");
System.out.println( JSONArray.fromObject(bean));
JSON json = JSONSerializer.toJSON( bean );
// return JSONObject.fromObject(bean);
System.out.println("json.toString**************"+json.toString()
);
}
}
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：
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]; }]
就是一个数组；