Java <->Json

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
Java代码
  1. boolean[] boolArray =newboolean[]{true,false,true};      
  2.             JSONArray jsonArray1 = JSONArray.fromObject( boolArray );      
  3.             System.out.println( jsonArray1 );      
  4.            // prints [true,false,true]    
  5.               
  6.             List list = new ArrayList();      
  7.             list.add( "first" );      
  8.             list.add( "second" );      
  9.             JSONArray jsonArray2 = JSONArray.fromObject( list );      
  10.             System.out.println( jsonArray2 );      
  11.            // prints ["first","second"]    
  12.   
  13.             JSONArray jsonArray3 = JSONArray.fromObject( "['json','is','easy']" );      
  14.             System.out.println( jsonArray3 );      
  15.            // prints ["json","is","easy"]     

2、Map
Java代码
  1. Map map = new HashMap();      
  2.           map.put( "name","json" );      
  3.           map.put( "bool", Boolean.TRUE );      
  4.             
  5.           map.put( "int",new Integer(1) );      
  6.           map.put( "arr",new String[]{"a","b"} );      
  7.           map.put( "func","function(i){ return this.arr[i]; }" );      
  8.           JSONObject json = JSONObject.fromObject( map );      
  9.           System.out.println( json );      
  10.          //{"func":function(i){ return this.arr[i]; },"arr":["a","b"],"int":1,"name":"json","bool":true}  

3、BEAN
Java代码
  1. /**
  2.       * Bean.java
  3.          private String name = "json";   
  4.          private int pojoId = 1;   
  5.          private char[] options = new char[]{'a','f'};   
  6.          private String func1 = "function(i){ return this.options[i]; }";   
  7.          private JSONFunction func2 = new JSONFunction(new String[]{"i"},"return this.options[i];");
  8.      */   
  9. JSONObject jsonObject = JSONObject.fromObject( new JsonBean() );      
  10. System.out.println( jsonObject );      
  11. //{"func1":function(i){ return this.options[i]; },"pojoId":1,"name":"json","options":["a","f"],"func2":function(i){ return this.options[i]; }}    

4、BEANS
Java代码
  1. /**
  2.        * private int row ;
  3.            private int col ;
  4.            private String value ;
  5.        *
  6.        */  
  7. List list = new ArrayList();   
  8.           JsonBean2 jb1 = new JsonBean2();   
  9.           jb1.setCol(1);   
  10.           jb1.setRow(1);   
  11.           jb1.setValue("xx");   
  12.             
  13.           JsonBean2 jb2 = new JsonBean2();   
  14.           jb2.setCol(2);   
  15.           jb2.setRow(2);   
  16.           jb2.setValue("");   
  17.             
  18.             
  19.           list.add(jb1);   
  20.           list.add(jb2);   
  21.             
  22.           JSONArray ja = JSONArray.fromObject(list);   
  23.           System.out.println( ja.toString() );   
  24.          //[{"value":"xx","row":1,"col":1},{"value":"","row":2,"col":2}]  

5、String to bean
Java代码
  1. String json = "{name=\"json\",bool:true,int:1,double:2.2,func:function(a){ return a; },array:[1,2]}";      
  2. JSONObject jsonObject = JSONObject.fromString(json);      
  3. Object bean = JSONObject.toBean( jsonObject );      
  4. assertEquals( jsonObject.get( "name" ), PropertyUtils.getProperty( bean,"name" ) );      
  5.    assertEquals( jsonObject.get( "bool" ), PropertyUtils.getProperty( bean,"bool" ) );      
  6.    assertEquals( jsonObject.get( "int" ), PropertyUtils.getProperty( bean,"int" ) );      
  7.     assertEquals( jsonObject.get( "double" ), PropertyUtils.getProperty( bean,"double" ) );      
  8.     assertEquals( jsonObject.get( "func" ), PropertyUtils.getProperty( bean,"func" ) );      
  9.    List expected = JSONArray.toList( jsonObject.getJSONArray( "array" ) );      
  10.    assertEquals( expected, (List) PropertyUtils.getProperty( bean, "array" ) );    


Java代码
  1. String json = "{\"value\":\"xx\",\"row\":1,\"col\":1}";      
  2. JSONObject jsonObject = JSONObject.fromString(json);   
  3.    JsonBean2 bean = (JsonBean2) JSONObject.toBean( jsonObject, JsonBean2.class );      
  4.     assertEquals( jsonObject.get( "col" ),new Integer( bean.getCol())   );      
  5.       assertEquals( jsonObject.get( "row" ),new Integer( bean.getRow() ) );      
  6.       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]; }]


1. json-lib是一个java类库,提供将Java对象,包括beans, maps, collections, java arrays and XML等转换成JSON,或者反向转换的功能。

 

2. json-lib 主页 : http://json-lib.sourceforge.net/

 

3.执行环境

     需要以下类库支持

  • jakarta commons-lang 2.5
  • jakarta commons-beanutils 1.8.0
  • jakarta commons-collections 3.2.1
  • jakarta commons-logging 1.1.1
  • ezmorph 1.0.6

4.功能示例

   这里通过JUnit-Case例子给出代码示例

  

复制代码
package com.mai.json;

import  static org.junit.Assert.assertEquals;

import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import net.sf.ezmorph.Morpher;
import net.sf.ezmorph.MorpherRegistry;
import net.sf.ezmorph.bean.BeanMorpher;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import net.sf.json.util.JSONUtils;

import org.apache.commons.beanutils.PropertyUtils;
import org.junit.Test;

public  class JsonLibTest {

     /*
     *  普通类型、List、Collection等都是用JSONArray解析
     *  
     *  Map、自定义类型是用JSONObject解析
     *  可以将Map理解成一个对象,里面的key/value对可以理解成对象的属性/属性值
     *  即{key1:value1,key2,value2......}
     * 
     * 1.JSONObject是一个name:values集合,通过它的get(key)方法取得的是key后对应的value部分(字符串)
     *         通过它的getJSONObject(key)可以取到一个JSONObject,--> 转换成map,
     *         通过它的getJSONArray(key) 可以取到一个JSONArray ,
     * 
     * 
     
*/
    
     // 一般数组转换成JSON
    @Test
     public  void testArrayToJSON(){
         boolean[] boolArray =  new  boolean[]{ true, false, true};  
        JSONArray jsonArray = JSONArray.fromObject( boolArray );  
        System.out.println( jsonArray );  
         //  prints [true,false,true]  
    }
    
    
     // Collection对象转换成JSON
    @Test
     public  void testListToJSON(){
        List list =  new ArrayList();  
        list.add( "first" );  
        list.add( "second" );  
        JSONArray jsonArray = JSONArray.fromObject( list );  
        System.out.println( jsonArray );  
         //  prints ["first","second"]  
    }
    
    
     // 字符串json转换成json, 根据情况是用JSONArray或JSONObject
    @Test
     public  void testJsonStrToJSON(){
        JSONArray jsonArray = JSONArray.fromObject( "['json','is','easy']" );  
        System.out.println( jsonArray );  
         //  prints ["json","is","easy"]  
    }
    
    
     // Map转换成json, 是用jsonObject
    @Test
     public  void testMapToJSON(){
        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 );  
    }
    
     // 复合类型bean转成成json
    @Test
     public  void testBeadToJSON(){
        MyBean bean =  new MyBean();
        bean.setId("001");
        bean.setName("银行卡");
        bean.setDate( new Date());
        
        List cardNum =  new ArrayList();
        cardNum.add("农行");
        cardNum.add("工行");
        cardNum.add("建行");
        cardNum.add( new Person("test"));
        
        bean.setCardNum(cardNum);
        
        JSONObject jsonObject = JSONObject.fromObject(bean);
        System.out.println(jsonObject);
        
    }
    
     // 普通类型的json转换成对象
    @Test
     public  void testJSONToObject()  throws Exception{
        String json = "{name=\"json\",bool:true,int:1,double:2.2,func:function(a){ return a; },array:[1,2]}";  
        JSONObject jsonObject = JSONObject.fromObject( json ); 
        System.out.println(jsonObject);
        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" ) );  
        System.out.println(PropertyUtils.getProperty(bean, "name"));
        System.out.println(PropertyUtils.getProperty(bean, "bool"));
        System.out.println(PropertyUtils.getProperty(bean, "int"));
        System.out.println(PropertyUtils.getProperty(bean, "double"));
        System.out.println(PropertyUtils.getProperty(bean, "func"));
        System.out.println(PropertyUtils.getProperty(bean, "array"));
        
        List arrayList = (List)JSONArray.toCollection(jsonObject.getJSONArray("array"));
         for(Object object : arrayList){
            System.out.println(object);
        }
        
    }
    
    
     // 将json解析成复合类型对象, 包含List
    @Test
     public  void testJSONToBeanHavaList(){
        String json = "{list:[{name:'test1'},{name:'test2'}],map:{test1:{name:'test1'},test2:{name:'test2'}}}";
//         String json = "{list:[{name:'test1'},{name:'test2'}]}";
        Map classMap =  new HashMap();
        classMap.put("list", Person. class);
        MyBeanWithPerson diyBean = (MyBeanWithPerson)JSONObject.toBean(JSONObject.fromObject(json),MyBeanWithPerson. class , classMap);
        System.out.println(diyBean);
        
        List list = diyBean.getList();
         for(Object o : list){
             if(o  instanceof Person){
                Person p = (Person)o;
                System.out.println(p.getName());
            }
        }
    }
    
    
     // 将json解析成复合类型对象, 包含Map
    @Test
     public  void testJSONToBeanHavaMap(){
         // 把Map看成一个对象
        String json = "{list:[{name:'test1'},{name:'test2'}],map:{testOne:{name:'test1'},testTwo:{name:'test2'}}}";
        Map classMap =  new HashMap();
        classMap.put("list", Person. class);
        classMap.put("map", Map. class);
         // 使用暗示,直接将json解析为指定自定义对象,其中List完全解析,Map没有完全解析
        MyBeanWithPerson diyBean = (MyBeanWithPerson)JSONObject.toBean(JSONObject.fromObject(json),MyBeanWithPerson. class , classMap);
        System.out.println(diyBean);
        
        System.out.println("do the list release");
        List<Person> list = diyBean.getList();
         for(Person o : list){
            Person p = (Person)o;
            System.out.println(p.getName());
        }
        
        System.out.println("do the map release");
        
         // 先往注册器中注册变换器,需要用到ezmorph包中的类
        MorpherRegistry morpherRegistry = JSONUtils.getMorpherRegistry();
        Morpher dynaMorpher =  new BeanMorpher( Person. class,  morpherRegistry);  
        morpherRegistry.registerMorpher( dynaMorpher );  
        
        
        Map map = diyBean.getMap();
         /* 这里的map没进行类型暗示,故按默认的,里面存的为net.sf.ezmorph.bean.MorphDynaBean类型的对象 */
        System.out.println(map);
      /*输出:
        {testOne=net.sf.ezmorph.bean.MorphDynaBean@f73c1[
          {name=test1}
        ], testTwo=net.sf.ezmorph.bean.MorphDynaBean@186c6b2[
          {name=test2}
        ]}
      */
        List<Person> output =  new ArrayList();  
         for( Iterator i = map.values().iterator(); i.hasNext(); ){  
             // 使用注册器对指定DynaBean进行对象变换
           output.add( (Person)morpherRegistry.morph( Person. class, i.next() ) );  
        }  
        
         for(Person p : output){
            System.out.println(p.getName());
        /*输出:
          test1
          test2
        */
        }
        
    }
    
    
    
}

 

5.下面提供上面例子所需的资源,包括jar包和代码

/Files/mailingfeng/json-lib/json-lib用例所需jar包和java类.rar


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