JSON与JAVA数据的转换

JSON与JAVA数据的转换

关键字: json java
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:

jakarta commons-lang 2.3 
 
jakarta commons-beanutils 1.7.0 
 
jakarta commons-collections 3.2 
 
jakarta commons-logging 1.1 
 
ezmorph 1.0.1 
 
1、List 
 

Java代码 
 
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 
 

Java代码 
 
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 
 

Java代码 
 
/** 
 
      * 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 
 

Java代码 
 
/** 
 
       * 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}]   
 
/** 
 
* 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}] 
 

5、String to bean 
 

Java代码 
 
String json = "{name=\"json\",bool:true,int:1,double:2.2,func:function(a){ return a; },array:[1,2]}";       
 
JSONObject jsonObject = JSONObject.fromString(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" ) );       
 
   assertEquals( expected, (List) PropertyUtils.getProperty( bean, "array" ) );     
 
String json = "{name=\"json\",bool:true,int:1,double:2.2,func:function(a){ return a; },array:[1,2]}"; 
 
JSONObject jsonObject = JSONObject.fromString(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" ) ); 
 
assertEquals( expected, (List) PropertyUtils.getProperty( bean, "array" ) ); 
 



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