LinkedHashMap转为对象

最新推荐文章于 2023-10-19 15:33:34 发布

LambdaRemoveIf

最新推荐文章于 2023-10-19 15:33:34 发布

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文章标签： java 开发语言

本文链接：https://blog.youkuaiyun.com/LambdaRemoveIf/article/details/128382250

加入依赖

import com.alibaba.fastjson.JSON;

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.83</version>
</dependency>

创建 LinkedHashMap 集合

List<Map> mapList = new ArrayList<>();
    for (int i = 1; i <= 5; i++){
    LinkedHashMap<Object,Object> hashMap = new LinkedHashMap<>();
    hashMap.put("nickName","小五" + i);
    hashMap.put("phone","20" + i);
    hashMap.put("icon","天津" + i + "号");
    mapList.add(hashMap);
    }

user 对象

@Data
public Class User{
    private Long id;
    private String nickName;
    private String phone;
    private String icon;
}

需要将 linkedHashMap 集合转为数组对象集合时，如下

//转数组对象
List<User> userList = JSON.parseArray(JSON.toJSONString(mapList), User.class);
System.err.println(userList);

将 map 转为实体类对象时，需要结合fastjson 来实现

  @Test
    public void t1(){
        List<Map> mapList = new ArrayList<>();
        for (int i = 1; i <= 5; i++){
            LinkedHashMap<Object,Object> hashMap = new LinkedHashMap<>();
            hashMap.put("nickName","小五" + i);
            hashMap.put("phone","20" + i);
            hashMap.put("icon","天津" + i + "号");
            mapList.add(hashMap);
        }
        System.err.println("LinkendMap集合............");
        System.err.println(mapList);
        System.err.println();
        System.err.println();
        //转数组对象
        System.err.println("数组对象..........");
        List<User> userList = JSON.parseArray(JSON.toJSONString(mapList), User.class);
        System.err.println(userList);
    }