JSON与JAVA数据的转换

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./ 
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"]

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}

3、BEAN 

/**
      * 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 

/**
       * 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 

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() );

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]; }]