實體類User代碼：

package com.neuedu.entity;import lombok.AllArgsConstructor;import lombok.Data;import lombok.NoArgsConstructor;import java.util.Date;/** * Keafmd * * @ClassName: User * @Description: user實體類 * @author: 牛哄哄的柯南 * @date: 2020-12-17 14:08 */@Data@AllArgsConstructor@NoArgsConstructorpublic class User { private Integer id; private String name; private String address; private Date date;}

我沒有自己寫構(gòu)造函數(shù)和Setter()，Getter()以及toString()方法，而是使用了lombok自動生成的。

添加依賴：

<dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.73</version></dependency>3.測試一下

JsonTest 代碼：

package com.neuedu.entity;import com.alibaba.fastjson.JSON;import com.alibaba.fastjson.serializer.SerializerFeature;import org.junit.Test;import java.util.ArrayList;import java.util.Date;import java.util.List;/** * Keafmd * * @ClassName: Test * @Description: user測試類 * @author: 牛哄哄的柯南 * @date: 2020-12-17 14:10 */public class JsonTest { @Test public void test(){ List userList = new ArrayList(); userList.add(new User(1,'牛哄哄的柯南1','某某省某某市1',new Date())); userList.add(new User(2,'牛哄哄的柯南2','某某省某某市2',new Date())); userList.add(new User(3,'牛哄哄的柯南3','某某省某某市3',new Date())); userList.add(new User(4,'牛哄哄的柯南4','某某省某某市4',new Date())); userList.add(new User(5,'牛哄哄的柯南5','某某省某某市5',new Date())); userList.add(new User(6,'牛哄哄的柯南6','某某省某某市6',new Date())); //List集合轉(zhuǎn)換成 json String json = JSON.toJSONString(userList, SerializerFeature.WriteDateUseDateFormat ); System.out.println(json); }}

運行結(jié)果：

[{'address':'某某省某某市1','date':'2020-12-17 21:09:21','id':1,'name':'牛哄哄的柯南1'},{'address':'某某省某某市2','date':'2020-12-17 21:09:21','id':2,'name':'牛哄哄的柯南2'},{'address':'某某省某某市3','date':'2020-12-17 21:09:21','id':3,'name':'牛哄哄的柯南3'},{'address':'某某省某某市4','date':'2020-12-17 21:09:21','id':4,'name':'牛哄哄的柯南4'},{'address':'某某省某某市5','date':'2020-12-17 21:09:21','id':5,'name':'牛哄哄的柯南5'},{'address':'某某省某某市6','date':'2020-12-17 21:09:21','id':6,'name':'牛哄哄的柯南6'}]

Process finished with exit code 0

UserController代碼：

package com.neuedu.controller;import com.alibaba.fastjson.JSON;import com.alibaba.fastjson.serializer.SerializerFeature;import com.neuedu.entity.User;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.IOException;import java.io.PrintWriter;import java.util.ArrayList;import java.util.Date;import java.util.List;/** * Keafmd * * @ClassName: UserController * @Description: UserController * @author: 牛哄哄的柯南 * @date: 2020-12-17 14:20 * * * http://127.0.0.1:8080/web/user */@WebServlet(name='UserController' ,urlPatterns = '/user')public class UserController extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { List userList = new ArrayList(); userList.add(new User(1,'牛哄哄的柯南1','某某省某某市1',new Date())); userList.add(new User(2,'牛哄哄的柯南2','某某省某某市2',new Date())); userList.add(new User(3,'牛哄哄的柯南3','某某省某某市3',new Date())); userList.add(new User(4,'牛哄哄的柯南4','某某省某某市4',new Date())); userList.add(new User(5,'牛哄哄的柯南5','某某省某某市5',new Date())); userList.add(new User(6,'牛哄哄的柯南6','某某省某某市6',new Date())); String json = JSON.toJSONString(userList, SerializerFeature.WriteDateUseDateFormat ); resp.setContentType('application/json'); resp.setCharacterEncoding('utf-8'); PrintWriter out = resp.getWriter(); out.write(json); out.flush(); out.close(); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { this.doGet(req, resp); }}

啟動服務(wù)訪問http://127.0.0.1:8080/web/user

訪問結(jié)果：

OK,到此就完成實體類轉(zhuǎn)為json對象的需求了。更多相關(guān)Java實體類轉(zhuǎn)為json對象內(nèi)容請搜索好吧啦網(wǎng)以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持好吧啦網(wǎng)！