java json转化成map java json转list

JSON是Java EE 8中自带的一个JSON处理库，可以方便地将Json数据转换为Java对象。需要先在pom.xml中添加JSON库的依赖：

<dependency>
    <groupId>javax.json</groupId>
    <artifactId>javax.json-api</artifactId>
    <version>1.1.4</version>
</dependency>
<dependency>
    <groupId>org.glassfish</groupId>
    <artifactId>javax.json</artifactId>
    <version>1.1.4</version>
</dependency>

然后使用JsonReader和JsonArray将Json数据转换为List对象

import javax.json.Json;
import javax.json.JsonArray;
import javax.json.JsonReader;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.List;
public class Main {
public static void main(String[] args) {
        String json = "[{\"name\":\"Tom\",\"age\":18},{\"name\":\"Jerry\",\"age\":20}]";
        JsonReader jsonReader = Json.createReader(new StringReader(json));
        JsonArray jsonArray = jsonReader.readArray();
        List<Person> personList = new ArrayList<>();
        for (int i = 0; i < jsonArray.size(); i++) {
            String name = jsonArray.getJsonObject(i).getString("name");
            int age = jsonArray.getJsonObject(i).getInt("age");
            Person person = new Person();
            person.setName(name);
            person.setAge(age);
            personList.add(person);
        }
        System.out.println(personList);
    }
}

class Person {
    private String name;
    private int age;
    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; }
    @Override
    public String toString() {
        return "Person{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}