如何使用Json-lib

1. 数组与List、Collection等都用JSONArray解析

boolean[] boolArray = new boolean[]{true,false,true};  

JSONArray jsonArray = JSONArray.fromObject( boolArray );  

System.out.println( jsonArray );  

// prints [true,false,true]  

List list = new ArrayList();  

list.add( "first" );  

list.add( "second" );  

JSONArray jsonArray = JSONArray.fromObject( list );  

System.out.println( jsonArray );  

// prints ["first","second"]  

JSONArray jsonArray = JSONArray.fromObject( "['json','is','easy']" );  

System.out.println( jsonArray );  

// prints ["json","is","easy"]

2. Beans & Maps 转换 to JSON

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 jsonObject = JSONObject.fromObject( map );  

System.out.println( jsonObject );  

// prints ["name":"json","bool":true,"int":1,"arr":["a","b"],"func":function(i){ return this.arr[i]; }]  



class MyBean{  

   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];");  

  

   // getters & setters  

   ...  

}  

  

JSONObject jsonObject = JSONObject.fromObject( new MyBean() );  

System.out.println( jsonObject );  

/* prints 

  {"name":"json","pojoId":1,"options":["a","f"], 

  "func1":function(i){ return this.options[i];}, 

  "func2":function(i){ return this.options[i];}} 

*/

 

3.From JSON to Beans

 

Convert to DynaBean:

String json = "{name=\"json\",bool:true,int:1,double:2.2,func:function(a){ return a; },array:[1,2]}";  

JSONObject jsonObject = JSONObject.fromObject( 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" ) );  

Assertions.assertListEquals( expected, (List) PropertyUtils.getProperty( bean, "array" ) );

 

Convert to Bean:

String json = "{bool:true,integer:1,string:\"json\"}";  

JSONObject jsonObject = JSONObject.fromObject( json );  

BeanA bean = (BeanA) JSONObject.toBean( jsonObject, BeanA.class );  

assertEquals( jsonObject.get( "bool" ), Boolean.valueOf( bean.isBool() ) );  

assertEquals( jsonObject.get( "integer" ), new Integer( bean.getInteger() ) );  

assertEquals( jsonObject.get( "string" ), bean.getString() );

 

Working with XML

From JSON to XML

JSONObject json = JSONObject.fromObject("{\"name\":\"json\",\"bool\":true,\"int\":1}");  

String xml = XMLSerializer.write( json );

 

From XML to JSON

JSONArray json = (JSONArray) XMLSerializer.read( xml );  

System.out.println( json );  

// prints [function(i,j){ return matrix[i][j]; }]