fastjson 的简单使用，对象与JSON字符串互转

使用 fastjson 当然先要导入 JAR 包，下面是 maven 依赖的地址

<dependency>
    <groupId>com.alibabagroupId>
    <artifactId>fastjsonartifactId>
    <version>1.2.73version>
dependency>

先准备一个 Use 和 Grade 类

• User.java

package top.shijialeya.po;

public class User {
    private String name;
    private Integer age;

    public User() {
    }

    public User(String name, Integer age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

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

    public Integer getAge() {
        return age;
    }

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

    @Override
    public String toString() {
        return "User{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}

• Grade.java

package top.shijialeya.po;

import java.util.ArrayList;
import java.util.List;

public class Grade {
    private String name;
    private List<User> users = new ArrayList<User>();

    public Grade() {
    }

    public Grade(String name, List<User> users) {
        this.name = name;
        this.users = users;
    }

    public String getName() {
        return name;
    }

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

    public List<User> getUsers() {
        return users;
    }

    public void setUsers(List<User> users) {
        this.users = users;
    }

    @Override
    public String toString() {
        return "Grade{" +
                "name='" + name + '\'' +
                ", users=" + users +
                '}';
    }
}

序列化

把 JavaBean 对象转成 JSON 格式的字符串

将对象转为 JOSN 字符主要使用到 JSON.toJSONString(Object)

1. 简单的 Java 类转为 JSON

@Test
public void test01() {
    //简单 java 类转换成 JSON
    User user = new User("张三", 18);
    String userJSONString = JSON.toJSONString(user);
    System.out.println(userJSONString);
}

结果：

{"age":18,"name":"张三"}

2. List