JSON简单例子-白红宇

JSON简单例子

阅读量：6934 次

发布时间：2019-06-27

本文共 5239 字，大约阅读时间需要 17 分钟。

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到下载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，可在搜索下载。

//第一个案例：java转换成JSON字符串

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

public void fromVector(){             List
    
      teas=new ArrayList
     
      ();       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

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")

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
    
      teas = (List
     
      ) 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 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

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
    
      seas = new ArrayList
     
      ();       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" ) );

转载于:https://my.oschina.net/xiahuawuyu/blog/67484

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