FastJson 解析序列化及反序列化

Posted 2022-01-14 xiaozhaoboke

一、环境准备：使用maven特性在pom.xml中导入fastjson的依赖包

<!-- https://mvnrepository.com/artifact/com.alibaba/fastjson -->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.47</version>
</dependency>

二、序列化

package cn.xiaobing.json;

import com.alibaba.fastjson.JSONObject;

import cn.xiaobing.pojo.ResultJson;

public class jsonDemo02 
    /**将对象序列化成json
     * @return jsonString
     */
    public static String entityToJsonString () 
        //构造器实例化对象
        ResultJson resutlJson = new ResultJson("2","登录失败，密码错误！");
        //利用fastjson中JSONObject类的toJSONString方法，实现将对象ResultJson转化为jsonString
//        String jsonString = JSONObject.toJSONString(resutlJson);
        //如果需要美化输出json格式 
        String jsonString = JSONObject.toJSONString(resutlJson,true);
        return jsonString;
    
    public static void main(String[] args) 
        String jsonString = entityToJsonString();
        System.out.println("ResultJson序列化json字符串："+"\\n"+jsonString);
    

三、反序列化

1.提供json字符串如："status":"1","message":"登录成功"

2.创建实体类对象

package cn.xiaobing.pojo;

/**创建实体类ResultJson，属性与提供jsonString中的key保持一致
 * @author Administrator
 */
public class ResultJson 
    private String status;
    private String message;
    public String getStatus() 
        return status;
    
    public void setStatus(String status) 
        this.status = status;
    
    public String getMessage() 
        return message;
    
    public void setMessage(String message) 
        this.message = message;
    
    
    public ResultJson() 
        super();
    
    public ResultJson(String status, String message) 
        super();
        this.status = status;
        this.message = message;
    
    @Override
    public String toString() 
        return "ResultJson [status=" + status + ", message=" + message + "]";
    

3.利用fastJson实现json字符串的反序列化

 1 package cn.xiaobing.json;
 2 
 3 import java.util.Map;
 4 
 5 import com.alibaba.fastjson.JSONObject;
 6 
 7 import cn.xiaobing.pojo.ResultJson;
 8 
 9 /**利用fastJson实现json字符串的反序列化
10  * @author Administrator
11  */
12 public class jsonDemo01 
13     //提供json字符串"status":"1","message":"登录成功"
14     static String jsonString = "\\"status\\":\\"1\\",\\"message\\":\\"登录成功\\"";
15     /**
16      * 利用fastJson实现json字符串反序列化为对象
17      */
18     public static ResultJson jsonStringToEntity() 
19         
20         //创建实体类 resultJson,利用fastjson中JSONObject类的parseObject方法，实现将jsonString转化为对象ResultJson
21         ResultJson resultJson = JSONObject.parseObject(jsonString, ResultJson.class);
22         return resultJson;
23     
24     /**
25      * 利用fastJson实现json字符串保存Map中
26      */
27     public static Map<String, String> jsonStringToMapping() 
28         //将json字符串封装到Map
29         Map<String, String> map = (Map<String, String>) JSONObject.parse(jsonString);
30         return map;
31     
32     public static void main(String[] args) 
33         ResultJson resultJson = jsonStringToEntity();
34         System.out.println("json转换成对象输出："+"status:"+resultJson.getStatus()+",message:"+resultJson.getMessage());
35         Map<String, String> map = jsonStringToMapping();
36         System.out.println("json转换成Map输出："+"status:"+map.get("status")+",message:"+map.get("message"));
37     
38 

4.未完待续... ...