springboot搭建SSM框架步骤

1.创建Maven工程

选择web 和sql以及mabatis

2.项目框架结构

注意，启动文件**application.java需要和项目平级，或者大于它。

3.pom.xml文件

<?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>2.2.0.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.itheima</groupId> <artifactId>springboot_mybatis</artifactId> <version>0.0.1-SNAPSHOT</version> <name>springboot_mybatis</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>2.1.0</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.48</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> <exclusions> <exclusion> <groupId>org.junit.vintage</groupId> <artifactId>junit-vintage-engine</artifactId> </exclusion> </exclusions> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>

4.注意，系统自带的mysql驱动包为8.0版本，低版本的对应为5.0版本的

idea自带的mysql驱动版本

我们需要使用的mysql版本，构建环境时候，需要注意版本对应的问题。

需要使用的mysql版本

 5.application.properties需要的配置

#DB Configuration: spring.datasource.driverClassName=com.mysql.jdbc.Driver spring.datasource.url=jdbc:mysql://localhost:3306/test spring.datasource.username=root spring.datasource.password=root #配置mybatis信息 #spring集成Mybatis环境 #pojo别名扫描包 mybatis.type-aliases-package=com.itheima.ssm.domain #加载Mybatis映射文件 mybatis.mapper-locations=classpath:mapper/*Mapper.xml

6.*Mapper.xml映射文件需要填写的内容

<?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.itheima.ssm.dao.IUserDao"> <!-- 配置查询所有操作 --> <select id="findAll" resultType="com.itheima.ssm.domain.User"> select * from product </select> </mapper>

图中划红线的部分记得修改，不然会出现如下错误。

 

 

 

7.编写测试类

 

 

package com.itheima.ssm; import com.itheima.ssm.dao.IUserDao; import com.itheima.ssm.domain.User; import org.junit.jupiter.api.Test; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.test.context.SpringBootTest; import java.util.List; @SpringBootTest class SsmApplicationTests { @Autowired private IUserDao iUserDao; @Test void contextLoads() { List<User> all = iUserDao.findAll(); for (User i:all ) { System.out.println(i); } } }