JSON简单例子

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" ) );