~~~ package com.kimgao.bootlauch; import com.fasterxml.jackson.core.JsonProcessingException; import com.fasterxml.jackson.databind.ObjectMapper; import com.kimgao.bootlauch.model.Article; import com.kimgao.bootlauch.model.Reader; import org.junit.jupiter.api.Test; import java.util.ArrayList; import java.util.Date; import java.util.List; public class JacksonTest { @Test void testJacson() throws JsonProcessingException { //jackson 的 ObjectMapper 轉換對象 ObjectMapper mapper = new ObjectMapper(); List<Reader> readers = new ArrayList<Reader>(){{ add(new Reader("kobe",21)); add(new Reader("kimgao",32)); }}; Article article = Article.builder() .id(1L) .author("kimgao") .content("青銅") .createTime(new Date()) .reader(readers) .title("T1") .build(); //序列化與反序列化 //將java多項轉換為JSON字符串 String jsonStr = mapper.writeValueAsString(article); System.out.println(jsonStr); //將JSON字符串轉換為Java對象 Article article1 = mapper.readValue("{\"content\":\"青銅\",\"title\":\"T1\",\"createTime\":\"2020/06/21 23:31:57\",\"reader\":[{\"name\":\"kobe\",\"age\":21},{\"name\":\"kimgao\",\"age\":32}],\"author\":\"kimgao\"}" ,Article.class); System.out.println(article1); } } ~~~