JSON与JAVA数据的转换

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最新推荐文章于 2025-08-08 12:35:56 发布

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文章标签： json java bean function string list

本文介绍如何使用JSON-lib库实现Java数据类型如List、Map、Bean等与JSON之间的转换，并展示从JSON字符串还原为Java Bean及XML的方法。

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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:
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

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]; }]