JAVA和JSON数据对象转换

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

/**
      * 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

/**
       * 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}]