java中map/json转实体类

依赖fastjson

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.35</version>
 </dependency>

User user = JSON.parseObject(jsonObject.toJSONString(), User.class);
User user = JSON.parseObject(JSON.toJSONString(map), User.class);

需要注意null值的处理