jackson 常用方法

 DTO

package com.jt.dto;

import com.fasterxml.jackson.annotation.JsonProperty;
import lombok.Data;


@Data
public class UserDTO {
    private String name;

    private Integer age;

    @JsonProperty("class")
    private String clazz;
}

package com.jt.dto;

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

import java.util.List;
import java.util.Map;


public class JsonToObject {

    public static void main(String[] args) throws JsonProcessingException {

        String json = "{"student":[{"name": "lili","age": 15,"class1": "高三7班"},{"name": "ldj","age": 5,"class1": "幼儿园"},{"name": "jack","age": 16,"class1": "初三5班"}]}";

        //jackson json -> Map
        ObjectMapper objectMapper = new ObjectMapper();

        Map> stringListMap1 = objectMapper.readValue(json, new TypeReference>>() {
        });

        Map stringListMap2 = objectMapper.readValue(json, new TypeReference>() {
        });

        System.out.println("jacksonMap1:" + stringListMap1);
        System.out.println("jacksonMap2:" + stringListMap2);

        //jackson json -> List
        String jsonBeans = "[{"name": "lili","age": 15,"class": "高三7班"},{"name": "ldj","age": 5,"class": "幼儿园"},{"name": "jack","age": 16,"class": "初三5班"}]";

        //UsersDTO usersDTO = objectMapper.readValue(jsonBeans, UsersDTO.class); 数组类型 反序列失败了
        //System.out.println(usersDTO);

        List