Using idea to complete a demo of springboot

itread01 2020-11-07 16:46:45
using idea complete demo springboot

I plan to start my graduation project , Write some blogs to record the process of graduation project .

Two days ago, I took some simple code from my teacher , The configuration environment has run for a while , When the teacher came to me, he said there was still 50% The job of , But it feels like at least 70%.

Not much nonsense , Today, learn to use IDEA Make a little demo.

The development environment is windows10、IntelliJ IDEA Community Edition 2020.2.3 x64、JDK11.

One . Create a project

First, on the initial interface New Project.


According to the online tutorial needs to choose spring Initializr, But my community version doesn't have , So we need a plug-in .

Back to the start interface , In the lower right corner, click Plugins.



Download Spring Assiant.


This way, when a new project is created, there will be a Spring Assistant, Select the default option next That's all right. .


Change the configuration of the project ,next.


Then check the required service , According to the Internet, you need Web Next check Spring Web ,Template Englines Tick Thymeleaf;SQL Tick :MySQL Driver,JDBC API and MyBatis Framework Three items ; Click on next;

This is me Spring Boot The version is 2.3.5.


Finally, set the storage path and click Finish.



Two . Configure projects

First, take a look at the structure of the project .



First of all maven Warehouse configuration , To configure maven Location and warehouse location , Then download what you need for the update jar package .



3、 ... and . Officially written

stay templates Create a new file index.html Page , As the initial page to launch

<!DOCTYPE html>
<html lang="en">
<meta charset="UTF-8">
Here is a simple launch page



stay com.wangyu.test Under the new controller Folder , stay controller Create a simple HelloController Class ;(Controller Class to add @Controller Notes , When the project starts ,SpringBoot It will scan and load automatically Controller)

package com.wangyu.test.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
public class HelloController {
public String sayHello(){
return "index";



stay resources Under folder application In the first configuration DataSource Basic information ,application There are two file formats , One is to .properties At the end of the word , One is to .yml It's the end of the word , There is a slight difference between the two configurations , Please refer to this website for details :; Here I use .yml File format at the end of the word . Right click application File selection Refact, Choice Rename, Change the ending to yml.

name: springboottest
url: jdbc:mysql://localhost:3306/springboottest
username: root
password: xxxxxx
driver-class-name: com.mysql.cj.jdbc.Driver


pom.xml File configuration information .

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="" xmlns:xsi=""
<relativePath/> <!-- lookup parent from repository -->
<description>Demo project for Spring Boot</description>
<!--thymeleaf Template engine configuration -->
<!--Web Rely on -->
<!--MyBatis To configure -->
<!--MySQL Database configuration -->
<!-- Unit test configuration -->


Bean Entity class , According to the database table , Generate set and get Method :

package com.wangyu.test.bean;
public class UserBean {
private int id;
private String name;
private String password;
public int getId() {
return id;
public void setId(int id) { = id;
public String getName() {
return name;
public void setName(String name) { = name;
public String getPassword() {
return password;
public void setPassword(String password) {
this.password = password;


Mapper Layer access database interface files :

package com.wangyu.test.mapper;
import com.wangyu.test.bean.UserBean;
public interface UserMapper {
UserBean getInfo(String name, String password);


Mapper Layer access database implementation file ( Need to be in resource Create... Under the package mapper Folder , And then build another UserMapper.xml. stay application In the configuration file mybatis:mapper-locations: The corresponding file address is ), Be careful <mapper> Labeled namespace Attribute should be filled in   Access database interface class file path :

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-// Mapper 3.0//EN" "" >
<mapper namespace="com.wangyu.test.mapper.UserMapper">
<select id="getInfo" parameterType="String" resultType="com.wangyu.test.bean.UserBean">
SELECT * FROM user WHERE name = #{name} AND password = #{password}


Service Layer business interface class :

package com.wangyu.test.service;
import com.wangyu.test.bean.UserBean;
public interface UserService {
UserBean loginIn(String name, String password);

Service Layer business implementation class writing , Note that @Service, Inject Mapper:

package com.wangyu.test.serviceImpl;
import com.wangyu.test.bean.UserBean;
import com.wangyu.test.mapper.UserMapper;
import com.wangyu.test.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
public class UserServiceImpl implements UserService {
// Will DAO Inject Service Layer
private UserMapper userMapper;
public UserBean loginIn(String name, String password) {
return userMapper.getInfo(name,password);


The project startup class should be annotated @MapperScan Scan when the project starts mapper Interface , Otherwise, it will report an error and cannot find mapper Archives :

package com.wangyu.test;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
public class TestApplication {
public static void main(String[] args) {, args);


Write test class , See if you can succeed Access the database , Access to database information :

package com.wangyu.test;
import com.wangyu.test.bean.UserBean;
import com.wangyu.test.service.UserService;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
public class TestApplicationTests {
UserService userService;
public void contextLoads() {
UserBean userBean = userService.loginIn("a","a");
System.out.println(" The user ID For :");



controller Layer , Pay attention to the addition of @controller Notes , Inject Service Service :

package com.wangyu.test.controller;
import com.wangyu.test.bean.UserBean;
import com.wangyu.test.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
public class LoginController {
// Will Service Inject Web Layer
UserService userService;
public String show(){
return "login";
@RequestMapping(value = "/loginIn",method = RequestMethod.POST)
public String login(String name,String password){
UserBean userBean = userService.loginIn(name,password);
return "success";
}else {
return "error";



<!DOCTYPE html>
<html lang="en">
<meta charset="UTF-8">
<form role="form" action = "/loginIn" method="post">
Account number :<input type="text" id="name" name = "name"> <br>
code :<input type="password" id = "password" name = "password"> <br>
<input type="submit" id = "login" value = "login">



<!DOCTYPE html>
<html lang="en">
<meta charset="UTF-8">
<h1> Login successful !</h1>



<!DOCTYPE html>
<html lang="en">
<meta charset="UTF-8">
<h1> Login failed !</h1>


Execute the test class first , See if the database information is successfully obtained :


Execute Archives , Start the project , Enter the browser and type localhost:8080/login

Enter the account password to test whether the page Jump is normal .


So far , The whole demo And it's done .




Refer to :



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