JSON-lib框架，JAVA对象与JSON、XML之间的相互转换

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：

clip_image002

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：

Student.java

 1 package com.hoo.entity;
 2  
 3 public class Student {
 4     private int id;
 5     private String name;
 6     private String email;
 7     private String address;
 8     private Birthday birthday;
 9  
10     //setter、getter
11     public String toString() {
12         return this.name + "#" + this.id + "#" + this.address + "#" + this.birthday + "#" + this.email;
13     }
14 }
代码

Birthday.java

 1 package com.hoo.entity;
 2  
 3 public class Birthday {
 4     private String birthday;
 5     
 6     public Birthday(String birthday) {
 7         super();
 8         this.birthday = birthday;
 9     }
10     //setter、getter
11     public Birthday() {}
12     
13     @Override
14     public String toString() {
15         return this.birthday;
16     }
17 }
代码

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：

 1 package com.hoo.test;
 2  
 3 import java.lang.reflect.InvocationTargetException;
 4 import java.util.ArrayList;
 5 import java.util.Collection;
 6 import java.util.Date;
 7 import java.util.HashMap;
 8 import java.util.Iterator;
 9 import java.util.List;
10 import java.util.Map;
11 import java.util.Set;
12 import net.sf.json.JSON;
13 import net.sf.json.JSONArray;
14 import net.sf.json.JSONFunction;
15 import net.sf.json.JSONObject;
16 import net.sf.json.JSONSerializer;
17 import net.sf.json.JsonConfig;
18 import net.sf.json.processors.JsonValueProcessor;
19 import net.sf.json.util.PropertyFilter;
20 import net.sf.json.xml.XMLSerializer;
21 import org.apache.commons.beanutils.PropertyUtils;
22 import org.junit.After;
23 import org.junit.Before;
24 import org.junit.Test;
25 import com.hoo.entity.Birthday;
26 import com.hoo.entity.Student;
27  
28 /**
29  * <b>function:</b> 用json-lib转换java对象到JSON字符串
30  * 读取json字符串到java对象，序列化jsonObject到xml
31  * json-lib-version: json-lib-2.3-jdk15.jar
32  * 依赖包: 
33  * commons-beanutils.jar
34  * commons-collections-3.2.jar
35  * ezmorph-1.0.3.jar
36  * commons-lang.jar
37  * commons-logging.jar
38  * @author hoojo
39  * @createDate Nov 28, 2010 2:28:39 PM
40  * @file JsonlibTest.java
41  * @package com.hoo.test
42  * @project WebHttpUtils
43  * @blog http://blog.csdn.net/IBM_hoojo
44  * @email hoojo_@126.com
45  * @version 1.0
46  */
47 @SuppressWarnings({ "deprecation", "unchecked" })
48 public class JsonlibTest {
49     private JSONArray jsonArray = null;
50     private JSONObject jsonObject = null;
51     
52     private Student bean = null;
53     
54     @Before
55     public void init() {
56         jsonArray = new JSONArray(); 
57         jsonObject = new JSONObject(); 
58         
59         bean = new Student();
60         bean.setAddress("address");
61         bean.setEmail("email");
62         bean.setId(1);
63         bean.setName("haha");
64         Birthday day = new Birthday();
65         day.setBirthday("2010-11-22");
66         bean.setBirthday(day);
67     }
68     
69     @After
70     public void destory() {
71         jsonArray = null;
72         jsonObject = null;
73         bean = null;
74         System.gc();
75     }
76     
77     public final void fail(String string) {
78         System.out.println(string);
79     }
80     
81     public final void failRed(String string) {
82         System.err.println(string);
83     }
84     
85 }
代码

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：

 1 /*=========================Java Object >>>> JSON String ===========================*/
 2 /**
 3  * <b>function:</b>转Java Bean对象到JSON
 4  * @author hoojo
 5  * @createDate Nov 28, 2010 2:35:54 PM
 6  */
 7 @Test
 8 public void writeEntity2JSON() {
 9     fail("==============Java Bean >>> JSON Object==================");
10     fail(JSONObject.fromObject(bean).toString());
11     fail("==============Java Bean >>> JSON Array==================");
12     fail(JSONArray.fromObject(bean).toString());//array会在最外层套上[]
13     fail("==============Java Bean >>> JSON Object ==================");
14     fail(JSONSerializer.toJSON(bean).toString());
15     
16     fail("========================JsonConfig========================");
17     JsonConfig jsonConfig = new JsonConfig();   
18     jsonConfig.registerJsonValueProcessor(Birthday.class, new JsonValueProcessor() {
19         public Object processArrayValue(Object value, JsonConfig jsonConfig) {
20             if (value == null) {
21                 return new Date();
22             }
23             return value;
24         }
25  
26         public Object processObjectValue(String key, Object value, JsonConfig jsonConfig) {
27             fail("key:" + key);
28             return value + "##修改过的日期";
29         }
30  
31     });
32     jsonObject = JSONObject.fromObject(bean, jsonConfig);
33     
34     fail(jsonObject.toString());
35     Student student = (Student) JSONObject.toBean(jsonObject, Student.class);
36     fail(jsonObject.getString("birthday"));
37     fail(student.toString());
38     
39     fail("#####################JsonPropertyFilter############################");
40     jsonConfig.setJsonPropertyFilter(new PropertyFilter() {
41         public boolean apply(Object source, String name, Object value) {
42             fail(source + "%%%" + name + "--" + value);
43             //忽略birthday属性
44             if (value != null && Birthday.class.isAssignableFrom(value.getClass())) {
45                 return true;
46             }
47             return false;
48         }
49     });  
50     fail(JSONObject.fromObject(bean, jsonConfig).toString());
51     fail("#################JavaPropertyFilter##################");
52     jsonConfig.setRootClass(Student.class);   
53     jsonConfig.setJavaPropertyFilter(new PropertyFilter() {
54         public boolean apply(Object source, String name, Object value) {
55             fail(name + "@" + value + "#" + source);
56             if ("id".equals(name) || "email".equals(name)) {
57                 value = name + "@@";
58                 return true;
59             }
60             return false;
61         }
62     });   
63     //jsonObject = JSONObject.fromObject(bean, jsonConfig);
64     //student = (Student) JSONObject.toBean(jsonObject, Student.class);
65     //fail(student.toString());
66     student = (Student) JSONObject.toBean(jsonObject, jsonConfig);
67     fail("Student:" + student.toString());
68 }
代码

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：

 1 ==============Java Bean >>> JSON Object==================
 2 {"address":"address","birthday":{"birthday":"2010-11-22"},"email":"email","id":1,"name":"haha"}
 3 ==============Java Bean >>> JSON Array==================
 4 [{"address":"address","birthday":{"birthday":"2010-11-22"},"email":"email","id":1,"name":"haha"}]
 5 ==============Java Bean >>> JSON Object ==================
 6 {"address":"address","birthday":{"birthday":"2010-11-22"},"email":"email","id":1,"name":"haha"}
 7 ========================JsonConfig========================
 8 key:birthday
 9 {"address":"address","birthday":"2010-11-22##修改过的日期","email":"email","id":1,"name":"haha"}
10 2010-11-22##修改过的日期
11 haha#1#address#null#email
12 #####################JsonPropertyFilter############################
13 haha#1#address#2010-11-22#email%%%address--address
14 haha#1#address#2010-11-22#email%%%birthday--2010-11-22
15 haha#1#address#2010-11-22#email%%%email--email
16 haha#1#address#2010-11-22#email%%%id--1
17 haha#1#address#2010-11-22#email%%%name--haha
18 {"address":"address","email":"email","id":1,"name":"haha"}
19 #################JavaPropertyFilter##################
20 address@address#null#0#null#null#null
21 birthday@2010-11-22##修改过的日期#null#0#address#null#null
22 email@email#null#0#address#null#null
23 id@1#null#0#address#null#null
24 name@haha#null#0#address#null#null
25 Student:haha#0#address#null#null
结果

2、 将JavaList集合转换吃JSON字符串

 1 /**
 2  * <b>function:</b>转换Java List集合到JSON
 3  * @author hoojo
 4  * @createDate Nov 28, 2010 2:36:15 PM
 5  */
 6 @Test
 7 public void writeList2JSON() {
 8     fail("==============Java List >>> JSON Array==================");
 9     List<Student> stu = new ArrayList<Student>();
10     stu.add(bean);
11     bean.setName("jack");
12     stu.add(bean);
13     fail(JSONArray.fromObject(stu).toString());
14     fail(JSONSerializer.toJSON(stu).toString());
15 }
16 运行此方法后，可以看到控制台输出：
17 
18 ==============Java List >>> JSON Array==================
19 [{"address":"address","birthday":{"birthday":"2010-11-22"},"email":"email","id":1,"name":"jack"},
20 {"address":"address","birthday":{"birthday":"2010-11-22"},"email":"email","id":1,"name":"jack"}]
21 [{"address":"address","birthday":{"birthday":"2010-11-22"},"email":"email","id":1,"name":"jack"},
22 {"address":"address","birthday":{"birthday":"2010-11-22"},"email":"email","id":1,"name":"jack"}]
代码

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

 1 /**
 2  * <b>function:</b>转Java Map对象到JSON
 3  * @author hoojo
 4  * @createDate Nov 28, 2010 2:37:35 PM
 5  */
 6 @Test
 7 public void writeMap2JSON() {
 8     Map<String, Object> map = new HashMap<String, Object>();
 9     map.put("A", bean);
10     
11     bean.setName("jack");
12     map.put("B", bean);
13     map.put("name", "json");
14     map.put("bool", Boolean.TRUE);
15     map.put("int", new Integer(1));
16     map.put("arr", new String[] { "a", "b" });
17     map.put("func", "function(i){ return this.arr[i]; }"); 
18     fail("==============Java Map >>> JSON Object==================");
19     fail(JSONObject.fromObject(map).toString());
20     fail("==============Java Map >>> JSON Array ==================");
21     fail(JSONArray.fromObject(map).toString());
22     fail("==============Java Map >>> JSON Object==================");
23     fail(JSONSerializer.toJSON(map).toString());
24 }
代码

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：

 1 ==============Java Map >>> JSON Object==================
 2 {"arr":["a","b"],"A":{"address":"address","birthday":{"birthday":"2010-11-22"},"email":"email","id":1,"name":"jack"},"int":1,
 3 "B":{"address":"address","birthday":{"birthday":"2010-11-22"},"email":"email","id":1,"name":"jack"},"name":"json",
 4 "func":function(i){ return this.arr[i]; },"bool":true}
 5 ==============Java Map >>> JSON Array ==================
 6 [{"arr":["a","b"],"A":{"address":"address","birthday":{"birthday":"2010-11-22"},"email":"email","id":1,"name":"jack"},"int":1,
 7 "B":{"address":"address","birthday":{"birthday":"2010-11-22"},"email":"email","id":1,"name":"jack"},"name":"json",
 8 "func":function(i){ return this.arr[i]; },"bool":true}]
 9 ==============Java Map >>> JSON Object==================
10 {"arr":["a","b"],"A":{"address":"address","birthday":{"birthday":"2010-11-22"},"email":"email","id":1,"name":"jack"},"int":1,
11 "B":{"address":"address","birthday":{"birthday":"2010-11-22"},"email":"email","id":1,"name":"jack"},"name":"json",
12 "func":function(i){ return this.arr[i]; },"bool":true}
结果

4、 将更多类型转换成JSON

 1 /**
 2  * <b>function:</b>  转换更多数组类型到JSON
 3  * @author hoojo
 4  * @createDate Nov 28, 2010 2:39:19 PM
 5  */
 6 @Test
 7 public void writeObject2JSON() {
 8     String[] sa = {"a", "b", "c"};
 9     fail("==============Java StringArray >>> JSON Array ==================");
10     fail(JSONArray.fromObject(sa).toString());
11     fail(JSONSerializer.toJSON(sa).toString());
12     fail("==============Java boolean Array >>> JSON Array ==================");
13     boolean[] bo = { true, false, true };
14     fail(JSONArray.fromObject(bo).toString());
15     fail(JSONSerializer.toJSON(bo).toString());
16     Object[] o = { 1, "a", true, 'A', sa, bo };
17     fail("==============Java Object Array >>> JSON Array ==================");
18     fail(JSONArray.fromObject(o).toString());
19     fail(JSONSerializer.toJSON(o).toString());
20     fail("==============Java String >>> JSON ==================");
21     fail(JSONArray.fromObject("['json','is','easy']").toString());
22     fail(JSONObject.fromObject("{'json':'is easy'}").toString());
23     fail(JSONSerializer.toJSON("['json','is','easy']").toString());
24     fail("==============Java JSONObject >>> JSON ==================");
25     jsonObject = new JSONObject()   
26         .element("string", "JSON")
27         .element("integer", "1")
28         .element("double", "2.0")
29         .element("boolean", "true");  
30     fail(JSONSerializer.toJSON(jsonObject).toString());
31     
32     fail("==============Java JSONArray >>> JSON ==================");
33     jsonArray = new JSONArray()   
34         .element( "JSON" )   
35         .element( "1" )   
36         .element( "2.0" )   
37         .element( "true" ); 
38     fail(JSONSerializer.toJSON(jsonArray).toString());
39     
40     fail("==============Java JSONArray JsonConfig#setArrayMode >>> JSON ==================");
41     List input = new ArrayList();   
42     input.add("JSON");
43     input.add("1");
44     input.add("2.0");
45     input.add("true");   
46     JSONArray jsonArray = (JSONArray) JSONSerializer.toJSON( input );   
47     JsonConfig jsonConfig = new JsonConfig();   
48     jsonConfig.setArrayMode( JsonConfig.MODE_OBJECT_ARRAY );   
49     Object[] output = (Object[]) JSONSerializer.toJava(jsonArray, jsonConfig);
50     System.out.println(output[0]);
51     
52     fail("==============Java JSONFunction >>> JSON ==================");
53     String str = "{'func': function( param ){ doSomethingWithParam(param); }}";   
54     JSONObject jsonObject = (JSONObject) JSONSerializer.toJSON(str);   
55     JSONFunction func = (JSONFunction) jsonObject.get("func");   
56     fail(func.getParams()[0]);   
57     fail(func.getText() );   
58 }
代码

运行后结果如下：

 1 ==============Java StringArray >>> JSON Array ==================
 2 ["a","b","c"]
 3 ["a","b","c"]
 4 ==============Java boolean Array >>> JSON Array ==================
 5 [true,false,true]
 6 [true,false,true]
 7 ==============Java Object Array >>> JSON Array ==================
 8 [1,"a",true,"A",["a","b","c"],[true,false,true]]
 9 [1,"a",true,"A",["a","b","c"],[true,false,true]]
10 ==============Java String >>> JSON ==================
11 ["json","is","easy"]
12 {"json":"is easy"}
13 ["json","is","easy"]
14 ==============Java JSONObject >>> JSON ==================
15 {"string":"JSON","integer":"1","double":"2.0","boolean":"true"}
16 ==============Java JSONArray >>> JSON ==================
17 ["JSON","1","2.0","true"]
18 ==============Java JSONArray JsonConfig#setArrayMode >>> JSON ==================
19 JSON
20 ==============Java JSONFunction >>> JSON ==================
21 param
22 doSomethingWithParam(param);
结果

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

 1 private String json = "{"address":"chian","birthday":{"birthday":"2010-11-22"}," +
 2         ""email":"email@123.com","id":22,"name":"tom"}";
 3 /**
 4  * <b>function:</b>将json字符串转化为java对象
 5  * @author hoojo
 6  * @createDate Nov 28, 2010 3:01:16 PM
 7  */
 8 @Test
 9 public void readJSON2Bean() {
10     fail("==============JSON Object String >>> Java Bean ==================");
11     jsonObject = JSONObject.fromObject(json);
12     Student stu = (Student) JSONObject.toBean(jsonObject, Student.class);
13     fail(stu.toString());
14 }
代码

运行后，结果如下：

1 ==============JSON Object String >>> Java Bean ==================
2 tom#22#chian#2010-11-22#email@123.com
结果

2、 将json字符串转换成动态Java对象(MorphDynaBean)

 1 private String json = "{"address":"chian","birthday":{"birthday":"2010-11-22"},"+
 2         ""email":"email@123.com","id":22,"name":"tom"}";
 3  
 4 @Test
 5 public void readJSON2DynaBean() {
 6     try {
 7         fail("==============JSON Object String >>> Java MorphDynaBean ==================");
 8         JSON jo = JSONSerializer.toJSON(json);
 9         Object o = JSONSerializer.toJava(jo);//MorphDynaBean
10         fail(PropertyUtils.getProperty(o, "address").toString());
11         jsonObject = JSONObject.fromObject(json);
12         fail(jsonObject.getString("email"));
13         o = JSONSerializer.toJava(jsonObject);//MorphDynaBean
14         fail(PropertyUtils.getProperty(o, "name").toString());
15     } catch (IllegalAccessException e) {
16         e.printStackTrace();
17     } catch (InvocationTargetException e) {
18         e.printStackTrace();
19     } catch (NoSuchMethodException e) {
20         e.printStackTrace();
21     }
22 }
代码

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：

1 ==============JSON Object String >>> Java MorphDynaBean =============
2 chian
3 email@123.com
4 tom
结果

3、 将json字符串转成Java的Array数组

 1 private String json = "{"address":"chian","birthday":{"birthday":"2010-11-22"},"+
 2         ""email":"email@123.com","id":22,"name":"tom"}";
 3  
 4 @Test
 5 public void readJSON2Array() {
 6     try {
 7         fail("==============JSON Arry String >>> Java Array ==================");
 8         json = "[" + json + "]";
 9         jsonArray = JSONArray.fromObject(json);
10         fail("#%%%" + jsonArray.get(0).toString());
11         Object[] os = jsonArray.toArray();
12         System.out.println(os.length);
13         
14         fail(JSONArray.fromObject(json).join(""));
15         fail(os[0].toString());
16         Student[] stus = (Student[]) JSONArray.toArray(jsonArray, Student.class);
17         System.out.println(stus.length);
18         System.out.println(stus[0]);
19     } catch (Exception e) {
20         e.printStackTrace();
21     }
22 }
代码

运行的结果如下：

1 ==============JSON Arry String >>> Java Array ==================
2 #%%%{"address":"chian","birthday":{"birthday":"2010-11-22"},"email":"email@123.com","id":22,"name":"tom"}
3 1
4 {"address":"chian","birthday":{"birthday":"2010-11-22"},"email":"email@123.com","id":22,"name":"tom"}
5 {"address":"chian","birthday":{"birthday":"2010-11-22"},"email":"email@123.com","id":22,"name":"tom"}
6 1
7 tom#22#chian#2010-11-22#email@123.com
结果

4、 将JSON字符串转成Java的List集合

 1 private String json = "{"address":"chian","birthday":{"birthday":"2010-11-22"},"+
 2         ""email":"email@123.com","id":22,"name":"tom"}";
 3  
 4 @Test
 5 public void readJSON2List() {
 6     try {
 7         fail("==============JSON Arry String >>> Java List ==================");
 8         json = "[" + json + "]";
 9         jsonArray = JSONArray.fromObject(json);
10         List<Student> list = JSONArray.toList(jsonArray, Student.class);
11         System.out.println(list.size());
12         System.out.println(list.get(0));
13         
14         list = JSONArray.toList(jsonArray);
15         System.out.println(list.size());
16         System.out.println(list.get(0));//MorphDynaBean
17     } catch (Exception e) {
18         e.printStackTrace();
19     }
20 }
代码

运行后结果如下：

1 ==============JSON Arry String >>> Java List ==================
2 1
3 tom#22#chian#2010-11-22#email@123.com
4 1
5 net.sf.ezmorph.bean.MorphDynaBean@141b571[
6   {id=22, birthday=net.sf.ezmorph.bean.MorphDynaBean@b23210[
7   {birthday=2010-11-22}
8 ], address=chian, email=email@123.com, name=tom}
9 ]
结果

5、 将json字符串转换成Collection接口

 1 private String json = "{"address":"chian","birthday":{"birthday":"2010-11-22"},"+
 2         ""email":"email@123.com","id":22,"name":"tom"}";
 3  
 4 @Test
 5 public void readJSON2Collection() {
 6     try {
 7         fail("==============JSON Arry String >>> Java Collection ==================");
 8         json = "[" + json + "]";
 9         jsonArray = JSONArray.fromObject(json);
10         Collection<Student> con = JSONArray.toCollection(jsonArray, Student.class);
11         System.out.println(con.size());
12         Object[] stt = con.toArray();
13         System.out.println(stt.length);
14         fail(stt[0].toString());
15         
16     } catch (Exception e) {
17         e.printStackTrace();
18     }
19 }
代码

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：

1 ==============JSON Arry String >>> Java Collection ==================
2 1
3 1
4 tom#22#chian#2010-11-22#email@123.com
结果

6、 将json字符串转换成Map集合

 1 @Test
 2 public void readJSON2Map() {
 3     try {
 4         fail("==============JSON Arry String >>> Java Map ==================");
 5         json = "{"arr":["a","b"],"A":{"address":"address","birthday":{"birthday":"2010-11-22"},"+
 6         ""email":"email","id":1,"name":"jack"},"int":1,"+
 7         ""B":{"address":"address","birthday":{"birthday":"2010-11-22"},"+
 8         ""email":"email","id":1,"name":"jack"},"name":"json","bool":true}";
 9         jsonObject = JSONObject.fromObject(json);
10         Map<String, Class<?>> clazzMap = new HashMap<String, Class<?>>();
11         clazzMap.put("arr", String[].class);
12         clazzMap.put("A", Student.class);
13         clazzMap.put("B", Student.class);
14         Map<String, ?> mapBean = (Map) JSONObject.toBean(jsonObject, Map.class, clazzMap);
15         System.out.println(mapBean);
16         
17         Set<String> set = mapBean.keySet();
18         Iterator<String> iter = set.iterator();
19         while (iter.hasNext()) {
20             String key = iter.next();
21             fail(key + ":" + mapBean.get(key).toString());
22         }
23     } catch (Exception e) {
24         e.printStackTrace();
25     }
26 }
代码

运行后结果如下：

1 ==============JSON Arry String >>> Java Map ==================
2 {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}
3 A:jack#1#address#2010-11-22#email
4 arr:[a, b]
5 B:jack#1#address#2010-11-22#email
6 int:1
7 name:json
8 bool:true
结果

四、 JSON-lib对XML的支持

1、 将Java对象到XML

 1 /*============================Java Object >>>>> XML ==========================*/
 2 /**
 3  * <b>function:</b> 转换Java对象到XML
 4  * 需要额外的jar包：xom.jar
 5  * @author hoojo
 6  * @createDate Nov 28, 2010 2:39:55 PM
 7  */
 8 @Test
 9 public void writeObject2XML() {
10     XMLSerializer xmlSerializer = new XMLSerializer();
11     fail("==============Java String Array >>> XML ==================");
12     //xmlSerializer.setElementName("bean");
13     fail(xmlSerializer.write(JSONArray.fromObject(bean)));
14     String[] sa = {"a", "b", "c"};
15     fail("==============Java String Array >>> XML ==================");
16     fail(xmlSerializer.write(JSONArray.fromObject(sa)));
17     fail("==============Java boolean Array >>> XML ==================");
18     boolean[] bo = { true, false, true };
19     fail(xmlSerializer.write(JSONArray.fromObject(bo)));
20     fail(xmlSerializer.write(JSONSerializer.toJSON(bo)));
21     Object[] o = { 1, "a", true, 'A', sa, bo };
22     fail("==============Java Object Array >>> JSON Array ==================");
23     fail(xmlSerializer.write(JSONArray.fromObject(o)));
24     fail(xmlSerializer.write(JSONSerializer.toJSON(o)));
25     fail("==============Java String >>> JSON ==================");
26     fail(xmlSerializer.write(JSONArray.fromObject("['json','is','easy']")).toString());
27     fail(xmlSerializer.write(JSONObject.fromObject("{'json':'is easy'}")).toString());
28     fail(xmlSerializer.write(JSONSerializer.toJSON("['json','is','easy']")).toString());
29 }
代码

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：

 1 ==============Java String Array >>> XML ==================
 2 <?xml version="1.0" encoding="UTF-8"?>
 3 <a><e class="object">
 4 <address type="string">address</address><birthday class="object"><birthday type="string">2010-11-22</birthday></birthday>
 5 <email type="string">email</email><id type="number">1</id><name type="string">haha</name>
 6 </e></a>
 7  
 8 ==============Java String Array >>> XML ==================
 9 <?xml version="1.0" encoding="UTF-8"?>
10 <a><e type="string">a</e><e type="string">b</e><e type="string">c</e></a>
11  
12 ==============Java boolean Array >>> XML ==================
13 <?xml version="1.0" encoding="UTF-8"?>
14 <a><e type="boolean">true</e><e type="boolean">false</e><e type="boolean">true</e></a>
15  
16 <?xml version="1.0" encoding="UTF-8"?>
17 <a><e type="boolean">true</e><e type="boolean">false</e><e type="boolean">true</e></a>
18  
19 ==============Java Object Array >>> JSON Array ==================
20 <?xml version="1.0" encoding="UTF-8"?>
21 <a><e type="number">1</e><e type="string">a</e><e type="boolean">true</e><e type="string">A</e><e class="array">
22 <e type="string">a</e><e type="string">b</e><e type="string">c</e></e><e class="array"><e type="boolean">true</e>
23 <e type="boolean">false</e><e type="boolean">true</e></e></a>
24  
25 <?xml version="1.0" encoding="UTF-8"?>
26 <a><e type="number">1</e><e type="string">a</e><e type="boolean">true</e><e type="string">A</e><e class="array">
27 <e type="string">a</e><e type="string">b</e><e type="string">c</e></e><e class="array"><e type="boolean">true</e>
28 <e type="boolean">false</e><e type="boolean">true</e></e></a>
29  
30 ==============Java String >>> JSON ==================
31 <?xml version="1.0" encoding="UTF-8"?>
32 <a><e type="string">json</e><e type="string">is</e><e type="string">easy</e></a>
33  
34 <?xml version="1.0" encoding="UTF-8"?>
35 <o><json type="string">is easy</json></o>
36  
37 <?xml version="1.0" encoding="UTF-8"?>
38 <a><e type="string">json</e><e type="string">is</e><e type="string">easy</e></a>
结果

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

 1 /*============================XML String >>>>> Java Object ==========================*/
 2 /**
 3  * <b>function:</b>转换xml文档到java对象
 4  * @author hoojo
 5  * @createDate Nov 28, 2010 3:00:27 PM
 6  */
 7 @Test
 8 public void readXML2Object() {
 9     XMLSerializer xmlSerializer = new XMLSerializer();
10     fail("============== XML >>>> Java String Array ==================");
11     String[] sa = {"a", "b", "c"};
12     jsonArray = (JSONArray) xmlSerializer.read(xmlSerializer.write(JSONArray.fromObject(sa)));
13     fail(jsonArray.toString());
14     
15     String[] s = (String[]) JSONArray.toArray(jsonArray, String.class);
16     fail(s[0].toString());
17     
18     fail("============== XML >>>> Java boolean Array ==================");
19     boolean[] bo = { true, false, true };
20     jsonArray = (JSONArray) xmlSerializer.read(xmlSerializer.write(JSONArray.fromObject(bo)));
21     bo = (boolean[]) JSONArray.toArray(jsonArray, boolean.class);
22     fail(bo.toString());
23     System.out.println(bo[0]);
24     
25     jsonArray = (JSONArray) xmlSerializer.read(xmlSerializer.write(JSONSerializer.toJSON(bo)));
26     bo = (boolean[]) JSONArray.toArray(jsonArray, boolean.class);
27     fail(bo.toString());
28     System.out.println(bo[0]);
29     
30     fail("==============Java Object Array >>> JSON Array ==================");
31     Object[] o = { 1, "a", true, 'A', sa, bo };
32     jsonArray = (JSONArray) xmlSerializer.read(xmlSerializer.write(JSONArray.fromObject(o)));
33     System.out.println(jsonArray.getInt(0));
34     System.out.println(jsonArray.get(1));
35     System.out.println(jsonArray.getBoolean(2));
36     jsonArray = (JSONArray) xmlSerializer.read(xmlSerializer.write(JSONSerializer.toJSON(o)));
37     System.out.println(jsonArray.get(4));
38     System.out.println(jsonArray.getJSONArray(5).get(0));
39     System.out.println(jsonArray.get(5));
40     
41     fail("==============Java String >>> JSON ==================");
42     jsonArray = (JSONArray) xmlSerializer.read(xmlSerializer.write(JSONArray.fromObject("['json','is','easy']")).toString());
43     s = (String[]) JSONArray.toArray(jsonArray, String.class);
44     fail(s[0].toString());
45     jsonObject = (JSONObject) xmlSerializer.read(xmlSerializer.write(JSONObject.fromObject("{'json':'is easy'}")).toString());
46     Object obj = JSONObject.toBean(jsonObject);
47     System.out.println(obj);
48     jsonArray = (JSONArray) xmlSerializer.read(xmlSerializer.write(JSONSerializer.toJSON("['json','is','easy']")).toString());
49     s = (String[]) JSONArray.toArray(jsonArray, String.class);
50     fail(s[1].toString());
51 }
代码

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：

 1 ============== XML >>>> Java String Array ==================
 2 ["a","b","c"]
 3 a
 4 ============== XML >>>> Java boolean Array ==================
 5 [Z@15856a5
 6 true
 7 [Z@79ed7f
 8 true
 9 ==============Java Object Array >>> JSON Array ==================
10 1
11 a
12 true
13 ["a","b","c"]
14 true
15 ["true","false","true"]
16 ==============Java String >>> JSON ==================
17 json
18 net.sf.ezmorph.bean.MorphDynaBean@c09554[
19   {json=is easy}
20 ]
21 is
结果

3、 将xml的字符串内容，转换成Java的Array对象

 1 @Test
 2 public void testReadXml2Array() {
 3     String str = "<a class="array">" +   
 4           "<e type="function" params="i,j">" +  
 5           "return matrix[i][j];" +    
 6           "</e>" +  
 7         "</a>";
 8     JSONArray json = (JSONArray) new XMLSerializer().read(str);
 9     fail(json.toString());   
10 }
代码

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：

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

就是一个数组；

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原文地址：https://www.cnblogs.com/longqingyang/p/5569935.html