Java_数据交换_fastJSON_01_用法入门

一、用法

1.序列化—将Object转为Json对象

    Object data=JSON.toJSON( MyObject );

 注:本文的Object可以是Map、List、javaBean等

 

需求:请拼接如下json

{
  "openid": [
      "o1Pj9jmZvwSyyyyyyBa4aULW2mA", 
      "o1Pj9jmZvxxxxxxxxxULW2mA"
               ],
  "username": [
      "afdvvf",
      "abcd"
                ]
 }

 

代码

     Map<String,List<String>>  postDataMap= new HashMap<String,List<String>>();
     postDataMap.put("openid", openIdList);
     postDataMap.put("username", userNameList);

     Object data=JSON.toJSON(postDataMap);
     system.out.println(data.toString());
View Code

 

 

2.序列化—将Object转为Json字符串

String data=JSON.toJSONString(MyObject);

 

需求:请拼接如下字符串:

{}

 

代码:

    Object ob=new Object();
    String data=JSON.toJSONString(ob);
    System.out.println(data);
View Code

 

 

3.反序列化—将json字符串转为JSONObject

JSONObject jsonObject=JSON.parseObject(str);

 

Data data = JSON.parseObject(str, Data.class);

 

需求:将以下Json字符串转为JSONObject

{
  "openid": [
      "o1Pj9jmZvwSyyyyyyBa4aULW2mA", 
      "o1Pj9jmZvxxxxxxxxxULW2mA"
               ],
  "username": [
      "afdvvf",
      "abcd"
                ]
 }

 

代码:

        String str="{ " + 
                "  \"openid\": [ " + 
                "      \"o1Pj9jmZvwSyyyyyyBa4aULW2mA\",  " + 
                "      \"o1Pj9jmZvxxxxxxxxxULW2mA\" " + 
                "               ], " + 
                "  \"username\": [ " + 
                "      \"afdvvf\", " + 
                "      \"abcd\" " + 
                "                ] " + 
                " }";
        
        JSONObject jsonObject=JSON.parseObject(str);
        System.out.println(jsonObject.toJSONString());
View Code

 

 

4.通过JSONObject构造json字符串

JSONObject jsonObject=new JSONObject();
jsonObject.put(key, value);

 

需求:请构造如下json字符串

{
    "money": 123, 
    "s_pappid": "djwhei124"
}

 

代码:

        JSONObject jsonObject=new JSONObject();
        jsonObject.put("s_pappid", "djwhei124");
        jsonObject.put("money", 123);
        
        System.out.println(jsonObject.toJSONString());
View Code

 

 

 

 

 

 

二、参考资料

1.fastjson初级使用方法

2.fastjson 使用方法

 

posted @ 2017-10-15 22:03 shirayner 阅读(...) 评论(...) 编辑 收藏