fastjson是阿里巴巴的开源JSON解析库，它可以解析JSON格式的字符串，支持将Java Bean序列化为JSON字符串，也可以从JSON字符串反序列化到JavaBean。

package apitest;import java.util.HashMap;import java.util.Map;import com.alibaba.fastjson.JSON;import com.alibaba.fastjson.serializer.SerializerFeature;import com.github.checkpoint.JsonPath;import test.User;public class TestTest {    public static void main(String[] args) {        //对象转json        User user =new User(1,"zhangsan","男","生日","地址");        //SerializerFeature对数据进行一些定制  常用的有格式、空的时候展示、单引号等等        String jsonString = JSON.toJSONString(user,SerializerFeature.PrettyFormat,                 SerializerFeature.WriteNullStringAsEmpty, SerializerFeature.UseSingleQuotes);        System.out.println(jsonString);        //json转对象         User user1 =JSON.parseObject(jsonString,User.class);        System.out.println(user1);        //json转对象map        Map map=JSON.parseObject(jsonString,HashMap.class);        System.out.println(map);        //map转json        String jsonString2=JSON.toJSONString(map);        System.out.println(jsonString2);    }}