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]; }]