打开并配置IDEA
IDEA更换工作空间：
（也可不更换，就用原来的）
关闭当前工作空间：
创建新项目/选择新的工作空间
然后会有弹框，x掉。
配置MAVEN
配置JDK：
模型自动创建springboot项目：（也可手动创建）
等待一会儿。
修改目录结构
引入依赖：（pom.xml）
```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 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>2.1.6.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.baizhi</groupId>
<artifactId>yingx_zhangyk</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>yingx_zhangyk</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<!--web支持的jar springboot的启动器-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!--测试支持的jar-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<!-- 只在test测试里面运行 -->
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.4</version>
<scope>provided</scope>
</dependency>
<!--整合mybatis-->
<!--mybatis和springboot的整合包-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.0.0</version>
</dependency>
<!--数据源-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.0.29</version>
</dependency>
<!--数据库驱动-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.47</version>
</dependency>
<!--mybatis的核心jar-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.6</version>
</dependency>
<!-- 给内嵌tomcat提供jsp解析功能的jar-->
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.9.8</version>
</dependency>
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<!--引入fastjson-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.47</version>
</dependency>
<!--文件上传相关jar包-->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.8.1</version>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.6</version>
</dependency>
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.3</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
```
配置文件：(application.xml)
```xml
server:
port: 8989
servlet:
context-path: /yingx
jsp:
init-parameters:
development: true
spring:
mvc:
view:
suffix: .jsp
prefix: /
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/yingx
username: root
password: 123456
mybatis:
type-aliases-package: com.baizhi.entity
mapper-locations: classpath:com/baizhi/mapper/*Mapper.xml
```
可以开始写代码了。
提示：先写个流程测试一下
举例:
entity/Admin.java
```java
package com.baizhi.entity;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor //有参构造
@NoArgsConstructor //无参构造
public class Admin {
private String id;
private String username;
private String password;
}
```
resources/xxx/mapper/AdminMapper.xml
```java
<?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.baizhi.dao.AdminDao">
<select id="queryByUsername" parameterType="java.lang.String" resultType="Admin">
select id,username,password from yx_admin where username=#{username}
</select>
</mapper>
```
dao/AdminDao.java
```java
package com.baizhi.dao;
import com.baizhi.entity.Admin;
public interface AdminDao {
/*
后台管理员登录方法
*/
public Admin queryByUsername(String username);
}
```
xxxApplication.java
```java
package com.baizhi;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@MapperScan("com.baizhi.dao")
@SpringBootApplication
public class YingxZhangykApplication {
public static void main(String[] args) {
SpringApplication.run(YingxZhangykApplication.class, args);
}
}
```
test/xxx.java
```java
package com.baizhi.yingx_zhangyk;
import com.baizhi.dao.AdminDao;
import com.baizhi.entity.Admin;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import javax.annotation.Resource;
@RunWith(SpringRunner.class)
@SpringBootTest
public class YingxZhangykApplicationTests {
@Resource
AdminDao adminDao;
@Test
public void contextLoads() {
Admin admin= adminDao.queryByUsername("admin");
System.out.println(admin);
}
}
```
运行测试代码：
可以开始写项目了。
