使用fastjson转换类

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导入依赖

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.49</version>
</dependency>

准备

创建User类

创建UserDto类

对象互转（将User转为UserDto）

User u = new User("1","小王",18);
String jsonString = JSONObject.toJSONString(u);
 UserDto userDto = JSONObject.parseObject(jsonString, UserDto.class); 

Map转对象（将Map转为UserDto）

Map<String,Object> userMap = new HashMap<>();
userMap.put("id","2");
 userMap.put("name","小刘");
 userMap.put("age",19);

 String jsonStringMap = JSONObject.toJSONString(userMap);
 UserDto dto = JSONObject.parseObject(jsonStringMap, UserDto.class);

对象转Map（将User转为Map）

User u = new User("1","小王",18);
String jsonString = JSONObject.toJSONString(u);

Map map = JSONObject.parseObject(jsonString, Map.class);