首先找到File-new-Project找到Spring Initializr
然后点击next,填写好后继续next
选择左边的列web,右边列勾选web框
然后勾选需要的mysql mybatis等
如果前面没有修改工程名称,可以在这一界面更改,然后点击finish。
项目开始生成,界面右下角回弹出一个小方框,点击Enable Autop-Import ,idea 会自动下载jar包,时间比较长 (5分钟左右)
6、等待片刻后,项目格式如下图。controller,mapper,model,service是后来我新建的。
构建pom
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.7.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>demo</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<!-- web -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- mybatis -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.1</version>
</dependency>
<!-- mysql -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
创建application.properties文件
#基本配置
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/liujilu?useUnicode=true&characterEncoding=utf-8&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC
spring.datasource.username=用户名
spring.datasource.password=密码
spring.datasource.driverClassName=com.mysql.cj.jdbc.Driver
#使用mysql
spring.jpa.database = mysql
#是否显示sql语句
spring.jpa.show-sql=true
#mybatis配置 mybatis.config-location=classpath:mybatis-config.xml // 配置文件位置
mybatis.typeAliasesPackage=com.example.demo.model
mybatis.mapper-locations=classpath:mybatis/mapper/*.xml
user实体类
package com.example.demo.model;
public class User {
private String id;
private String name;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
创建Usermapper 接口
package com.example.demo.mapper;
import com.example.demo.model.User;
import org.apache.ibatis.annotations.Mapper;
import java.util.List;
@Mapper
public interface UserMapper {
public List<User> selectList();
}
创建接口 UserService
package com.example.demo.service;
import com.example.demo.model.User;
import java.util.List;
public interface UserService {
public List<User> selectList();
}
创建UserServiceImpl
package com.example.demo.service;
import com.example.demo.mapper.CoachMapper;
import com.example.demo.mapper.UserMapper;
import com.example.demo.model.Coach;
import com.example.demo.model.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class UserServiceImpl implements UserService{
@Autowired
private UserMapper uMapper;
@Override
public List<User> selectList() {
return uMapper.selectList();
}
}
在resource目录下创建mybatis文件下、在该文件下创建mapper文件夹、然后在该文件夹下创建User.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.example.demo.mapper.UserMapper">
<select id="selectList" resultType="user">
select * from user
</select>
</mapper>
创建controller
package com.example.demo.controller;
import com.example.demo.model.User;
import com.example.demo.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;
@RestController
public class TesrController {
@Autowired
private CoachService coachService;
@Autowired
private UserService userService;
@RequestMapping("/hello")
public String hello() {
return "hello world3";
}
@RequestMapping("/selectList")
public List<User> selectList() {
return userService.selectList();
}
}
最后附上启动器的代码
package com.example.demo;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
@MapperScan("com.example.demo.mapper")
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
项目结构图
启动项目在浏览器输入:http://localhost:8080/selectList ,如下图