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使用idea创建springboot项目

项目下载地址：

解压后的 demo09

1、环境准备

开发环境：idea 2020.1.1，jdk 1.8，maven3.6.0（

jdk安装教程

）（

idea2020.1.1安装教程

）


(maven的安装配置)

数据库

create database demo;
use demo;
create table user
(
    id       int auto_increment
        primary key,
    username varchar(20) null,
    gender   varchar(1)  null,
    age      int(3)      null
);

2、创建项目

提高构建速度，配置下面的参数

https://start.aliyun.com/

其余的默认即可





springboot版本和插件选择





项目名及位置

3、代码编写

创建如图所示的目录结构





application.properties

server.port=8001
server.servlet.context-path=/demo09
spring.application.name=demo09

# mysql数据库
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/demo?serverTimezone=GMT%2B8&useSSL=true&characterEncoding=UTF-8
spring.datasource.username=root
spring.datasource.password=root

mybatis.mapper-locations= classpath:mappers/*.xml
mybatis.type-aliases-package= com.mystery.domain

Demo09Application.java

package com.mystery;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;

@SpringBootApplication
@MapperScan("com.mystery.dao")
public class Demo09Application {

    public static void main(String[] args) {
        SpringApplication.run(Demo09Application.class, args);
    }
}

UserMapper.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.mystery.dao.UserMapper">

    <select id="getUserName" parameterType="int" resultType="String">

        select username from user WHERE id=#{id}
    </select>

</mapper>

pom.xml

<?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 http://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>2.2.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>cn.mystery</groupId>
    <artifactId>demo09</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo09</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.2</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

        <!--线程池-->
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.2</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </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>
            <!--添加配置跳过测试-->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
                <version>2.22.1</version>
                <configuration>
                    <skipTests>true</skipTests>
                </configuration>
            </plugin>
            <!--添加配置跳过测试-->
        </plugins>
    </build>
</project>

运行结果