JSON简单例子(Json-lib)

   下载

    到http://json-lib.sourceforge.net下载json-lib-1.1-jdk15.jar，运行json还需要的包有：commons-lang.jar、commons-logging.jar，commons-beanutils.jar、xom-1.0-2005-01-05.jar、ezmorph-1.0.1.jar，可在http://www.docjar.com搜索下载。

//第一个案例：java转换成JSON字符串

    @Test

    public void fromObject(){

       //将java对象转换成JSON字符串

       Teacher teacher=new Teacher();

       teacher.setName("aa");

       teacher.setSex("男");

       teacher.setAge(28);

       teacher.setBirth(new Date());

      

       //JSON字符串

       //{name:"aa",sex:"男",age:"28",birth:"...."}

       //需要引入类库文件

       System.out.println(JSONObject.fromObject(teacher));

    }

 

{"age":28,"birth":{"date":28,"day":2,"hours":9,"minutes":32,"month":1,"seconds":5,"time":1330392725328,"timezoneOffset":-480,"year":112},"name":"aa","sex":"男"}

 

 

 

//将java集合转换成JSON字符串

    @Test

    public void fromVector(){

      

       List<Teacher> teas=new ArrayList<Teacher>();

       for(int i=0;i<3;i++){

          

          

              Teacher teacher=new Teacher();

              teacher.setName("aa");

              teacher.setSex("男");

              teacher.setAge(28);

              teacher.setBirth(new Date());

             

              teas.add(teacher);

       }

      

       //teas集合

       System.out.println(JSONArray.fromObject(teas).toString());

      

    }

 

 

[{"age":28,"birth":{"date":28,"day":2,"hours":9,"minutes":29,"month":1,"seconds":18,"time":1330392558562,"timezoneOffset":-480,"year":112},"name":"aa","sex":"男"},{"age":28,"birth":{"date":28,"day":2,"hours":9,"minutes":29,"month":1,"seconds":18,"time":1330392558562,"timezoneOffset":-480,"year":112},"name":"aa","sex":"男"},{"age":28,"birth":{"date":28,"day":2,"hours":9,"minutes":29,"month":1,"seconds":18,"time":1330392558562,"timezoneOffset":-480,"year":112},"name":"aa","sex":"男"}]

 

 

// JSON字符串转换为对象

    @Test

    public void fromJsonObject() {

       // 第一步：定义成字符串

       String teaObj = "{\"age\":28,\"birth\":{\"date\":28,\"day\":2,\"hours\":9,\"minutes\":20,\"month\":1,\"seconds\":25,\"time\":1330392025906,\"timezoneOffset\":-480,\"year\":112},\"name\":\"aa\",\"sex\":\"男\"}";

       // 第二步：使用JsonObject.fromObject方法将其字符串转换为JsonObject对象

       JSONObject jsonObj = JSONObject.fromObject(teaObj);

       // 第三步：调用JsonObject的toBean的方法，将其转换成一个Object对象当取单个的时候:

//System.out.println("uname:"+jsonObj.get("name")); 

//System.out.println("uname:"+PropertyUtils.getProperty(Teacher,"uname")); 

       Teacher teac = (Teacher) JSONObject.toBean(jsonObj,Teacher.class);

 

       System.out.println(teac.toString()); 

 

    }

 

Teacher [age=28, birth=Tue Feb 28 09:20:25CST 2012, name=aa, sex=男, stus=null]

 

// 将数组的字符串转换成集合对象

    @SuppressWarnings("unchecked")

    @Test

    public void fromJsonArray() {

       // 声明字符串

       String teaArr = "[{\"age\":28,\"birth\":{\"date\":28,\"day\":2,\"hours\":9,\"minutes\":28,\"month\":1,\"seconds\":44,\"time\":1330392524093,\"timezoneOffset\":-480,\"year\":112},\"name\":\"aa\",\"sex\":\"男\"},{\"age\":28,\"birth\":{\"date\":28,\"day\":2,\"hours\":9,\"minutes\":28,\"month\":1,\"seconds\":44,\"time\":1330392524093,\"timezoneOffset\":-480,\"year\":112},\"name\":\"aa\",\"sex\":\"男\"},{\"age\":28,\"birth\":{\"date\":28,\"day\":2,\"hours\":9,\"minutes\":28,\"month\":1,\"seconds\":44,\"time\":1330392524093,\"timezoneOffset\":-480,\"year\":112},\"name\":\"aa\",\"sex\":\"男\"}]";

       // 调用JsonArray.fromObject方法将其字符串转成一个JsonArray'对象

       JSONArray jsonArra = JSONArray.fromObject(teaArr);

       // 第三步：调用

       List<Teacher> teas = (List<Teacher>) JSONArray.toCollection(jsonArra,

              Teacher.class);

       for (Teacher tea : teas) {

           System.out.println(tea.toString());

       }

 

    }

 

Teacher [age=28, birth=Tue Feb28 09:28:44 CST 2012, name=aa, sex=男, stus=null]

Teacher [age=28, birth=Tue Feb28 09:28:44 CST 2012, name=aa, sex=男, stus=null]

Teacher [age=28, birth=Tue Feb 28 09:28:44CST 2012, name=aa, sex=男, stus=null]

 

 

//将java对象转换为json字符的案例

    @Test

    public void fromObject1(){

       // 将java对象转换为JSON数据

       Teacher teacher = new Teacher();

       teacher.setName("老王");

       teacher.setAge(23);

       teacher.setBirth(new Date());

      

       List<Student> seas = new ArrayList<Student>();

       for (int i = 0; i < 3; i++) {

           Student stu =  new Student();

           stu.setName("熊熊"+i);

           seas.add(stu);

       }

  

       teacher.setStus(seas);

      

       System.out.println(JSONObject.fromObject(teacher).toString());

 

    }

 

{"age":23,"birth":{"date":28,"day":2,"hours":13,"minutes":50,"month":1,"seconds":22,"time":1330408222921,"timezoneOffset":-480,"year":112},"name":"老王","sex":"","stus":[{"name":"熊熊0"},{"name":"熊熊1"},{"name":"熊熊2"}]}

 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 );

 System.out.print(jsonObject.get( "name" )),System.out.print(PropertyUtils.getProperty( bean, "name" ) ); 一样取值
 jsonObject.get( "bool" )|| PropertyUtils.getProperty( bean, "bool" ) );
 jsonObject.get( "int" )||PropertyUtils.getProperty( bean, "int" ) );
 jsonObject.get( "double" )|| PropertyUtils.getProperty( bean, "double" ) );
  jsonObject.get( "func" )|| PropertyUtils.getProperty( bean, "func" ) );
 List expected = JSONArray.toList( jsonObject.getJSONArray( "array" ) );
 expected, (List) PropertyUtils.getProperty( bean, "array" ) );