JSON-lib这个Java类包用于把bean,map和XML转换成JSON并能够把JSON转回成bean和DynaBean。

下载地址:http://json-lib.sourceforge.net/
还要需要的第3方包:
org.apache.commons(3.2以上版本)
org.apache.oro
net.sf.ezmorph(ezmorph-1.0.4.jar)
nu.xom

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

1、List
Java代码
boolean[] boolArray = new boolean[]{true,false,true};      
JSONArray jsonArray1 = JSONArray.fromObject( boolArray );      
System.out.println( jsonArray1 );      
// prints [true,false,true]    
  
List list = new ArrayList();      
list.add( "first" );      
list.add( "second" );      
JSONArray jsonArray2 = JSONArray.fromObject( list );      
System.out.println( jsonArray2 );      
// prints ["first","second"]    
  
JSONArray jsonArray3 = JSONArray.fromObject( "['json','is','easy']" );      
System.out.println( jsonArray3 );      
// prints ["json","is","easy"]    

            boolean[] boolArray = new boolean[]{true,false,true};  
            JSONArray jsonArray1 = JSONArray.fromObject( boolArray );  
            System.out.println( jsonArray1 );  
            // prints [true,false,true]  
            
            List list = new ArrayList();  
            list.add( "first" );  
            list.add( "second" );  
            JSONArray jsonArray2 = JSONArray.fromObject( list );  
            System.out.println( jsonArray2 );  
            // prints ["first","second"]  

            JSONArray jsonArray3 = JSONArray.fromObject( "['json','is','easy']" );  
            System.out.println( jsonArray3 );  
            // prints ["json","is","easy"]     2、Map
Java代码
Map map = new HashMap();      
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]; }" );      
JSONObject json = JSONObject.fromObject( map );      
System.out.println( json );      
//{"func":function(i){ return this.arr[i]; },"arr":["a","b"],"int":1,"name":"json","bool":true}  

         Map map = new HashMap();  
         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]; }" );  
         JSONObject json = JSONObject.fromObject( map );  
         System.out.println( json );  
         //{"func":function(i){ return this.arr[i]; },"arr":["a","b"],"int":1,"name":"json","bool":true} 3、BEAN
Java代码
/**  
     * Bean.java  
        private String name = "json";    
        private int pojoId = 1;    
        private char[] options = new char[]{'a','f'};    
        private String func1 = "function(i){ return this.options[i]; }";    
        private JSONFunction func2 = new JSONFunction(new String[]{"i"},"return this.options[i];");  
    */    
JSONObject jsonObject = JSONObject.fromObject( new JsonBean() );      
System.out.println( jsonObject );      
//{"func1":function(i){ return this.options[i]; },"pojoId":1,"name":"json","options":["a","f"],"func2":function(i){ return this.options[i]; }}    

/**
     * Bean.java
        private String name = "json";  
        private int pojoId = 1;  
        private char[] options = new char[]{'a','f'};  
        private String func1 = "function(i){ return this.options[i]; }";  
        private JSONFunction func2 = new JSONFunction(new String[]{"i"},"return this.options[i];");
    */
JSONObject jsonObject = JSONObject.fromObject( new JsonBean() );  
System.out.println( jsonObject );  
//{"func1":function(i){ return this.options[i]; },"pojoId":1,"name":"json","options":["a","f"],"func2":function(i){ return this.options[i]; }}   4、BEANS
Java代码
/**  
      * private int row ;  
          private int col ;  
          private String value ;  
      *  
      */  
List list = new ArrayList();  
         JsonBean2 jb1 = new JsonBean2();  
         jb1.setCol(1);  
         jb1.setRow(1);  
         jb1.setValue("xx");  
            
         JsonBean2 jb2 = new JsonBean2();  
         jb2.setCol(2);  
         jb2.setRow(2);  
         jb2.setValue("");  
            
            
         list.add(jb1);  
         list.add(jb2);  
            
         JSONArray ja = JSONArray.fromObject(list);  
         System.out.println( ja.toString() );  
         //[{"value":"xx","row":1,"col":1},{"value":"","row":2,"col":2}]  

/**
      * private int row ;
          private int col ;
          private String value ;
      *
      */
List list = new ArrayList();
         JsonBean2 jb1 = new JsonBean2();
         jb1.setCol(1);
         jb1.setRow(1);
         jb1.setValue("xx");
        
         JsonBean2 jb2 = new JsonBean2();
         jb2.setCol(2);
         jb2.setRow(2);
         jb2.setValue("");
        
        
         list.add(jb1);
         list.add(jb2);
        
         JSONArray ja = JSONArray.fromObject(list);
         System.out.println( ja.toString() );
         //[{"value":"xx","row":1,"col":1},{"value":"","row":2,"col":2}] 5、String to bean
Java代码
String json = "{name=/"json/",bool:true,int:1,double:2.2,func:function(a){ return a; },array:[1,2]}";      
JSONObject jsonObject = JSONObject.fromString(json);      
Object bean = JSONObject.toBean( jsonObject );      
assertEquals( jsonObject.get( "name" ), PropertyUtils.getProperty( bean, "name" ) );      
  assertEquals( jsonObject.get( "bool" ), PropertyUtils.getProperty( bean, "bool" ) );      
  assertEquals( jsonObject.get( "int" ), PropertyUtils.getProperty( bean, "int" ) );      
   assertEquals( jsonObject.get( "double" ), PropertyUtils.getProperty( bean, "double" ) );      
   assertEquals( jsonObject.get( "func" ), PropertyUtils.getProperty( bean, "func" ) );      
  List expected = JSONArray.toList( jsonObject.getJSONArray( "array" ) );      
  assertEquals( expected, (List) PropertyUtils.getProperty( bean, "array" ) );    

String json = "{name=/"json/",bool:true,int:1,double:2.2,func:function(a){ return a; },array:[1,2]}";  
JSONObject jsonObject = JSONObject.fromString(json);  
Object bean = JSONObject.toBean( jsonObject );  
assertEquals( jsonObject.get( "name" ), PropertyUtils.getProperty( bean, "name" ) );  
  assertEquals( jsonObject.get( "bool" ), PropertyUtils.getProperty( bean, "bool" ) );  
  assertEquals( jsonObject.get( "int" ), PropertyUtils.getProperty( bean, "int" ) );  
   assertEquals( jsonObject.get( "double" ), PropertyUtils.getProperty( bean, "double" ) );  
   assertEquals( jsonObject.get( "func" ), PropertyUtils.getProperty( bean, "func" ) );  
  List expected = JSONArray.toList( jsonObject.getJSONArray( "array" ) );  
  assertEquals( expected, (List) PropertyUtils.getProperty( bean, "array" ) );    Java代码
String json = "{/"value/":/"xx/",/"row/":1,/"col/":1}";      
JSONObject jsonObject = JSONObject.fromString(json);  
  JsonBean2 bean = (JsonBean2) JSONObject.toBean( jsonObject, JsonBean2.class );      
   assertEquals( jsonObject.get( "col" ),new Integer( bean.getCol())  );      
     assertEquals( jsonObject.get( "row" ), new Integer( bean.getRow() ) );      
     assertEquals( jsonObject.get( "value" ), bean.getValue() );    

String json = "{/"value/":/"xx/",/"row/":1,/"col/":1}";  
  JSONObject jsonObject = JSONObject.fromString(json);
   JsonBean2 bean = (JsonBean2) JSONObject.toBean( jsonObject, JsonBean2.class );  
    assertEquals( jsonObject.get( "col" ),new Integer( bean.getCol())  );  
      assertEquals( jsonObject.get( "row" ), new Integer( bean.getRow() ) );  
      assertEquals( jsonObject.get( "value" ), bean.getValue() );   6  json to xml
1)
JSONObject json = new JSONObject( true );  
String xml = XMLSerializer.write( json );  

<o class="object" null="true">  

2)
JSONObject json = JSONObject.fromObject("{/"name/":/"json/",/"bool/":true,/"int/":1}");  
String xml = XMLSerializer.write( json );  
<o class="object">  
   <name type="string">json</name>  
   <bool type="boolean">true</bool>  
   <int type="number">1</int>  
</o>  
   <o class="object">
      <name type="string">json</name>
      <bool type="boolean">true</bool>
      <int type="number">1</int>
   </o>
3)
JSONArray json = JSONArray.fromObject("[1,2,3]");  
String xml = XMLSerializer.write( json );  
<a class="array">
   <e type="number">1</e>  
   <e type="number">2</e>  
   <e type="number">3</e>  
</a>  

7 、xml to json
<a class="array">  
  <e type="function" params="i,j">  
      return matrix[i][j];  
  </e>  
</a>  
   <a class="array">
     <e type="function" params="i,j">
         return matrix[i][j];
     </e>
   </a>
  
JSONArray json = (JSONArray) XMLSerializer.read( xml );  
System.out.println( json );  
// prints [function(i,j){ return matrix[i][j]; }]