JSON与JAVA数据的转换

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2008-12 ( 6)
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AJAX学习

json Java Bean Ajax XML

关键字: json java

近年来当XML被人们提起时，几乎所有的人对它都很看好，都认为在XML上都能有事可做了。例如webservice、AJAX等等。就其中的 AJAX，可以说XML把ajax发挥到了一个至高的境界，数据交换成为了非常容易的事情。但是当你看见JSON时，可能觉得它是那么的小巧，那么的优美。原来传输对象数据还能这么简单，仅仅是简单的键值对文本就行了；并且还是JAVASCRIPT里面的。下面就怎么使用JSON和JAVA做简单的介绍。
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 = new boolean[]{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"]

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

   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}

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

   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]; }}

/**
     * 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

   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}]

/**
      * 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

   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" ) );

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

   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() );

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]; }]

出自http://falchion.iteye.com/