Jackson将json转换为字符串和列表的映射。

import com.fasterxml.jackson.databind.ObjectMapper;

public class JsonMapper {
    public static void main(String[] args) {
        String json = "{\"name\":\"John\", \"age\":30, \"city\":\"New York\"}";

        try {
            ObjectMapper objectMapper = new ObjectMapper();
            Person person = objectMapper.readValue(json, Person.class);
            System.out.println(person);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

class Person {
    private String name;
    private int age;
    private String city;

    // getters and setters

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

import com.fasterxml.jackson.databind.ObjectMapper;

public class JsonMapper {
    public static void main(String[] args) {
        Person person = new Person("John", 30, "New York");

        try {
            ObjectMapper objectMapper = new ObjectMapper();
            String json = objectMapper.writeValueAsString(person);
            System.out.println(json);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

class Person {
    private String name;
    private int age;
    private String city;

    // constructor, getters and setters

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

import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;

import java.util.List;

public class JsonMapper {
    public static void main(String[] args) {
        String json = "[{\"name\":\"John\", \"age\":30, \"city\":\"New York\"}, {\"name\":\"Alice\", \"age\":25, \"city\":\"London\"}]";

        try {
            ObjectMapper objectMapper = new ObjectMapper();
            List<Person> persons = objectMapper.readValue(json, new TypeReference<List<Person>>() {});
            System.out.println(persons);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

class Person {
    private String name;
    private int age;
    private String city;

    // getters and setters

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