1.創(chuàng)建個實(shí)體類

實(shí)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(shí)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(gòu)造函數(shù)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(zhuǎn)換成 json

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

System.out.println(json);

}

}

運(yùn)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

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(wù)訪問http://127.0.0.1:8080/web/user

訪問結(jié)果：

OK,到此就完成實(shí)體類轉(zhuǎn)為json對象的需求了。更多相關(guān)Java實(shí)體類轉(zhuǎn)為json對象內(nèi)容請搜索云海天教程以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持云海天教程！

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