json转化为对象

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;

public class FastjsonTest {
    public static void main(String[] args) {
        String jsonstr="{"id":"1001","name":"zs","age":18,"sex":"男","clazz":"一班"}";
        //json->对象
        // 通过反射进行转换 转换成指定对象
        Student student = JSON.parseObject(jsonstr, Student.class);
//        System.out.println(student.toString());

        //json->对象
        // 通过反射进行转换 转换成默认JSONObject对象 不需要创新的对象
//        //kv对象 hashmap
//        JSonObject jsonObject = JSON.parseObject(jsonstr);
//        Object id = jsonObject.get("id");
//        System.out.println(id);

        String  o = JSON.toJSONString(student);
        System.out.println(o);


    }
}

import com.google.gson.Gson;

import java.util.HashMap;

// "k":"v",k:18,k:v
// "id":1001,"name":"zs","age":18,"sex":"男","班级":"一班"
public class GsonTest {
    public static void main(String[] args) {
        String jsonstr="{"id":"1001","name":"zs","age":18,"sex":"男","clazz":"一班"}";
        System.out.println(jsonstr);
        Gson gson = new Gson();
        //json转化成对象
        Student student = gson.fromJson(jsonstr, Student.class);
        System.out.println(student.toString());
        System.out.println(student.getClazz());
        HashMap stringStringHashMap = new HashMap();
        HashMap hashMap = gson.fromJson(jsonstr, stringStringHashMap.getClass());
        System.out.println(hashMap);
        //对象转化成json
        //不是{k:v,k:v...}
        System.out.println("------------------");
//        int[] strs={1,2,3,4,5,6,7,8,9};
//        String s = gson.toJson(strs);
//        System.out.println(s);


    }

}

package mysql;

public class Student {
    private String id;
    private String name;
    private int age;
    private String gender;
    private String clazz;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }


    public String getClazz() {
        return clazz;
    }

    public void setClazz(String clazz) {
        this.clazz = clazz;
    }

    public Student() {
    }

    @Override
    public String toString() {
        return "Student{" +
                "id='" + id + ''' +
                ", name='" + name + ''' +
                ", age=" + age +
                ", gender='" + gender + ''' +
                ", clazz='" + clazz + ''' +
                '}';
    }

    public Student(String id, String name, int age, String gender, String clazz) {
        this.id = id;
        this.name = name;
        this.age = age;
        this.gender = gender;
        this.clazz = clazz;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }
}