JSON与JAVA的数据转换

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

1、List

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

 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

   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]; }}      
 
 
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

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}]    
 
    
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

    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" ) );  

   

  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]; }]