1.創建個實體類

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

@NoArgsConstructor

public class User {

private Integer id;

private String name;

private String address;

private Date date;

}

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

2.使用類庫 fastjson

添加依賴：

com.alibaba

fastjson

1.2.73

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集合轉換成 json

String json = JSON.toJSONString(userList, SerializerFeature.WriteDateUseDateFormat );

System.out.println(json);

}

}

運行結果：

[{"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

4.Controller代碼

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);

}

}

啟動服務訪問http://127.0.0.1:8080/web/user

訪問結果：

OK,到此就完成實體類轉為json對象的需求了。更多相關Java實體類轉為json對象內容請搜索云海天教程以前的文章或繼續瀏覽下面的相關文章希望大家以后多多支持云海天教程！

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