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]; }]