JSON与JAVA数据的转换

SON-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

Java代码  

1. boolean[] boolArray = new boolean[]{true,false,true};     
2.            JSONArray jsonArray1 = JSONArray.fromObject( boolArray );     
3.            System.out.println( jsonArray1 );     
4.            // prints [true,false,true]    
5.              
6.            List list = new ArrayList();     
7.            list.add( "first" );     
8.            list.add( "second" );     
9.            JSONArray jsonArray2 = JSONArray.fromObject( list );     
10.            System.out.println( jsonArray2 );     
11.            // prints ["first","second"]    
12.   
13.            JSONArray jsonArray3 = JSONArray.fromObject( "['json','is','easy']" );     
14.            System.out.println( jsonArray3 );     
15.            // prints ["json","is","easy"]     

2、Map

Java代码  

1. Map map = new HashMap();     
2.          map.put( "name", "json" );     
3.          map.put( "bool", Boolean.TRUE );     
4.            
5.          map.put( "int", new Integer(1) );     
6.          map.put( "arr", new String[]{"a","b"} );     
7.          map.put( "func", "function(i){ return this.arr[i]; }" );     
8.          JSONObject json = JSONObject.fromObject( map );     
9.          System.out.println( json );     
10.          //{"func":function(i){ return this.arr[i]; },"arr":["a","b"],"int":1,"name":"json","bool":true}  

3、BEAN

Java代码  

1. /** 
2.      * Bean.java  
3.         private String name = "json";    
4.         private int pojoId = 1;    
5.         private char[] options = new char[]{'a','f'};    
6.         private String func1 = "function(i){ return this.options[i]; }";    
7.         private JSONFunction func2 = new JSONFunction(new String[]{"i"},"return this.options[i];"); 
8.     */   
9. JSONObject jsonObject = JSONObject.fromObject( new JsonBean() );     
10. System.out.println( jsonObject );     
11.  //{"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  

1. /** 
2.       * private int row ; 
3.           private int col ; 
4.           private String value ; 
5.       * 
6.       */  
7. List list = new ArrayList();  
8.          JsonBean2 jb1 = new JsonBean2();  
9.          jb1.setCol(1);  
10.          jb1.setRow(1);  
11.          jb1.setValue("xx");  
12.            
13.          JsonBean2 jb2 = new JsonBean2();  
14.          jb2.setCol(2);  
15.          jb2.setRow(2);  
16.          jb2.setValue("");  
17.            
18.            
19.          list.add(jb1);  
20.          list.add(jb2);  
21.            
22.          JSONArray ja = JSONArray.fromObject(list);  
23.          System.out.println( ja.toString() );  
24.          //[{"value":"xx","row":1,"col":1},{"value":"","row":2,"col":2}]  

5、String to bean

Java代码  

1. String json = "{name=\"json\",bool:true,int:1,double:2.2,func:function(a){ return a; },array:[1,2]}";     
2. JSONObject jsonObject = JSONObject.fromString(json);     
3. Object bean = JSONObject.toBean( jsonObject );     
4.  assertEquals( jsonObject.get( "name" ), PropertyUtils.getProperty( bean, "name" ) );     
5.   assertEquals( jsonObject.get( "bool" ), PropertyUtils.getProperty( bean, "bool" ) );     
6.   assertEquals( jsonObject.get( "int" ), PropertyUtils.getProperty( bean, "int" ) );     
7.    assertEquals( jsonObject.get( "double" ), PropertyUtils.getProperty( bean, "double" ) );     
8.    assertEquals( jsonObject.get( "func" ), PropertyUtils.getProperty( bean, "func" ) );     
9.   List expected = JSONArray.toList( jsonObject.getJSONArray( "array" ) );     
10.   assertEquals( expected, (List) PropertyUtils.getProperty( bean, "array" ) );    

Java代码  

1. String json = "{\"value\":\"xx\",\"row\":1,\"col\":1}";     
2.  JSONObject jsonObject = JSONObject.fromString(json);  
3.   JsonBean2 bean = (JsonBean2) JSONObject.toBean( jsonObject, JsonBean2.class );     
4.    assertEquals( jsonObject.get( "col" ),new Integer( bean.getCol())  );     
5.      assertEquals( jsonObject.get( "row" ), new Integer( bean.getRow() ) );     
6.      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]; }]