idea创建Springboot+mybatis+mysql

故久

发布于 2019-09-29 14:59:10

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发布于 2019-09-29 14:59:10

文章被收录于专栏：故久故久

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