Gson 将json格式字符串转换为对象

使用谷歌的Gson进行字符串和json对象之间的转换，是很方便的，本文讲解如何使用Gson将json格式的字符串转换为json对象

1、先创建实体类

    package com.che.pri.bean;

    public class User {

        private String name;

        private String code;

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public String getCode() {
            return code;
        }

        public void setCode(String code) {
            this.code = code;
        }

        @Override
        public String toString() {
            return "User [name=" + name + ", code=" + code + "]";
        }
    }

2、进行list和Json之间的转换

package com.che.pri.json;

import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;
import com.che.pri.bean.User;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;

public class ListToJson {

    public static void main(String[] args) {
        List<User> list = new ArrayList<User>();

        User user1 = new User();
        user1.setCode("001");
        user1.setName("李逵");
        list.add(user1);

        User user2 = new User();
        user2.setCode("001");
        user2.setName("宋江");
        list.add(user2);

        User user3 = new User();
        user3.setCode("001");
        user3.setName("张飞");
        list.add(user3);

        User user4 = new User();
        user4.setCode("001");
        user4.setName("赵云");
        list.add(user4);
        //以上代码创建list对象

        //将list转换为json格式字符串
        String json = new Gson().toJson(list);
        System.out.println(json);
        //[{"name":"李逵","code":"001"},{"name":"宋江","code":"001"},{"name":"张飞","code":"001"},{"name":"赵云","code":"001"}]


        //将json格式字符串转换为List对象
        Type type = new TypeToken<List<User>>() {}.getType();
        List<User> userLists = new Gson().fromJson(json, type);
        System.out.println(userLists);
        //[User [name=李逵, code=001], User [name=宋江, code=001], User [name=张飞, code=001], User [name=赵云, code=001]]
    }

}

3、总结

通过new Gson().toJson(list)方法，将list对象转换为Json格式字符串

通过Type type = new TypeToken<List<User>>() {}.getType();List<User> userLists = new Gson().fromJson(json, type)方法将Json格式字符串转换为List对象