系列二十八、Spring + SpringMVC + MyBatis整合

已于 2024-02-01 20:42:55 修改
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分类专栏： Spring5系列 文章标签： Spring SpringMVC MyBatis
于 2023-11-06 15:32:31 首次发布
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本文链接：https://blog.youkuaiyun.com/HelloWorld20161112/article/details/134247298

一、概述

整合 Spring、SpringMVC、MyBatis。

二、整合步骤

2.1、pom

<dependencies>
	<!-- 普通maven项目中使用Sl4j注解 -->
	<dependency>
		<groupId>org.projectlombok</groupId>
		<artifactId>lombok</artifactId>
		<version>1.18.22</version>
	</dependency>
	<dependency>
		<groupId>org.slf4j</groupId>
		<artifactId>slf4j-api</artifactId>
		<version>1.7.32</version>
	</dependency>
	<dependency>
		<groupId>ch.qos.logback</groupId>
		<artifactId>logback-classic</artifactId>
		<version>1.2.10</version>
	</dependency>

	<!-- 工具 -->
	<dependency>
		<groupId>com.alibaba</groupId>
		<artifactId>fastjson</artifactId>
		<version>1.2.76</version>
	</dependency>
	<dependency>
		<groupId>org.apache.commons</groupId>
		<artifactId>commons-collections4</artifactId>
		<version>4.3</version>
	</dependency>
	<dependency>
		<groupId>org.apache.commons</groupId>
		<artifactId>commons-lang3</artifactId>
		<version>3.11</version>
	</dependency>
	<dependency>
		<groupId>cn.hutool</groupId>
		<artifactId>hutool-all</artifactId>
		<version>5.7.22</version>
	</dependency>
	<dependency>
		<groupId>com.fasterxml.jackson.core</groupId>
		<artifactId>jackson-databind</artifactId>
		<version>2.12.1</version>
	</dependency>

	<dependency>
		<groupId>org.apache.logging.log4j</groupId>
		<artifactId>log4j-web</artifactId>
		<version>2.12.1</version>
	</dependency>

	<!-- 三大框架整合 -->
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-webmvc</artifactId>
		<version>5.3.4</version>
	</dependency>
	<dependency>
		<groupId>org.mybatis</groupId>
		<artifactId>mybatis</artifactId>
		<version>3.5.6</version>
	</dependency>
	<dependency>
		<groupId>org.mybatis</groupId>
		<artifactId>mybatis-spring</artifactId>
		<version>2.0.6</version>
	</dependency>
	<dependency>
		<groupId>mysql</groupId>
		<artifactId>mysql-connector-java</artifactId>
		<version>8.0.26</version>
	</dependency>
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-jdbc</artifactId>
		<version>5.3.4</version>
	</dependency>
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-aop</artifactId>
		<version>5.3.4</version>
	</dependency>

	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-beans</artifactId>
		<version>5.3.4</version>
	</dependency>
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-context</artifactId>
		<version>5.3.4</version>
	</dependency>
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-core</artifactId>
		<version>5.3.4</version>
	</dependency>
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-expression</artifactId>
		<version>5.3.4</version>
	</dependency>
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-tx</artifactId>
		<version>5.3.4</version>
	</dependency>

	<!-- 动态代理 -->
	<dependency>
		<groupId>cglib</groupId>
		<artifactId>cglib</artifactId>
		<version>3.1</version>
	</dependency>
	<dependency>
		<groupId>aopalliance</groupId>
		<artifactId>aopalliance</artifactId>
		<version>1.0</version>
	</dependency>
	<dependency>
		<groupId>org.aspectj</groupId>
		<artifactId>aspectjweaver</artifactId>
		<version>1.9.19</version>
	</dependency>

</dependencies>

<build>
	<!--
		说明：
				在maven中，默认情况下maven要求我们将xxxMapper.xml配置文件、properties配置等都放在resources目录下，如果我们强行放在java目录，
			默认情况下打包的时候这个配置文件将会被自动忽略掉。

			场景一：将xxxMapper.xml文件和xxxMapper接口放在同一个包下
			解决方法：在resources目录添加下边的配置

			场景二：将xxxMapper.xml文件放在resources目录
			解决方法：在resources目录创建和xxxMapper同样的Directory
			坑：注意创建的是Directory，不是package
	-->
	<resources>
		<resource>
			<directory>src/main/java</directory>
			<includes>
				<include>**/*.xml</include>
			</includes>
		</resource>
		<resource>
			<directory>src/main/resources</directory>
		</resource>
	</resources>

	<plugins>
		<plugin>
			<groupId>org.apache.maven.plugins</groupId>
			<artifactId>maven-compiler-plugin</artifactId>
			<version>3.10.1</version>
			<configuration>
				<source>8</source>
				<target>8</target>
			</configuration>
		</plugin>
	</plugins>
</build>

2.2、db.properties

db.driver=com.mysql.cj.jdbc.Driver
db.url=jdbc:mysql://localhost:3306/20231106_ssm?useSSL=false&useUnicode=true&characterEncoding=UTF8&serverTimezone=GMT
db.username=root
db.password=123456

2.3、init.sql

drop DATABASE if EXISTS 20231106_ssm;
create DATABASE 20231106_ssm;
use 20231106_ssm;

CREATE TABLE `user`  (
                         `id` int NOT NULL AUTO_INCREMENT COMMENT '主键',
                         `username` varchar(50) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL COMMENT '用户名',
                         `password` varchar(60) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL COMMENT '密码',
                         `age` int NULL DEFAULT NULL COMMENT '年龄',
                         PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8mb4 COLLATE = utf8mb4_0900_ai_ci ROW_FORMAT = Dynamic;

INSERT INTO `user` VALUES (1, 'zhangsan', 'zhangsan123', 23);
INSERT INTO `user` VALUES (2, 'lisi', 'lisi123', 24);

2.4、applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop https://www.springframework.org/schema/aop/spring-aop.xsd">
    <context:property-placeholder location="classpath:db.properties"/>

    <context:component-scan base-package="org.star" use-default-filters="true">
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

    <bean class="org.springframework.jdbc.datasource.DriverManagerDataSource" id="dataSource">
        <property name="driverClassName" value="${db.driver}"/>
        <property name="url" value="${db.url}"/>
        <property name="username" value="${db.username}"/>
        <property name="password" value="${db.password}"/>
    </bean>

    <bean class="org.mybatis.spring.SqlSessionFactoryBean" id="sqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="typeAliasesPackage" value="org.star.entity.model"/>
        <property name="configuration">
            <bean class="org.apache.ibatis.session.Configuration">
                <property name="logImpl" value="org.apache.ibatis.logging.stdout.StdOutImpl"></property>
                <property name="cacheEnabled" value="true"></property>
            </bean>
        </property>
        <property name="mapperLocations" value="classpath:mappers/*.xml"/>
        <!--
        <property name="mapperLocations">
            <list>
                <value>classpath*:org/star/mapper/*.xml</value>
            </list>
        </property>
        -->
    </bean>
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer" id="mapperScannerConfigurer">
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactoryBean"/>
        <property name="basePackage" value="org.star.mapper"/>
    </bean>

    <!-- 事务管理器 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!--
        声明式事务：spring中的事务是基于aop实现，但使用的不是通知而是拦截器
    -->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <!--
            定义事务的对象信息
        -->
        <tx:attributes>
            <!--
                disable*：表示以disable开头的所有方法
            -->
            <tx:method name="*" propagation="REQUIRED" isolation="DEFAULT"/>
        </tx:attributes>
    </tx:advice>

    <aop:config>
        <aop:pointcut id="txPointCut" expression="execution(* org.star.service.UserService.*(..))"/>
        <aop:advisor advice-ref="txAdvice" pointcut-ref="txPointCut"></aop:advisor>
    </aop:config>

</beans>

2.5、dispatcherServlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <context:component-scan base-package="org.star" use-default-filters="false">
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>
    <mvc:annotation-driven/>

</beans>

2.6、web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">

    <!-- spring配置信息 -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <!-- springmvc配置信息 -->
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:dispatcherServlet.xml</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!-- 全局乱码过滤器配置 -->
    <filter>
        <filter-name>encodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
        <init-param>
            <param-name>forceRequestEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
        <init-param>
            <param-name>forceResponseEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

</web-app>

2.7、UserDO

/**
 * @Author : 一叶浮萍归大海
 * @Date: 2023/11/6 11:34
 * @Description:
 */
@Data
@AllArgsConstructor
@NoArgsConstructor
@Accessors(chain = true)
@ToString(callSuper = true)
public class UserDO implements Serializable {
    /**
     * 编号
     */
    private Integer id;

    /**
     * 用户名
     */
    private String username;

    /**
     * 密码
     */
    private String password;

    /**
     * 年龄
     */
    private Integer age;
}

2.8、UserMappper

/**
 * @Author : 一叶浮萍归大海
 * @Date: 2023/11/6 11:35
 * @Description:
 */
public interface UserMapper {

    /**
     * 添加用户
     * @param param
     */
    void saveUser(UserDO param);

    /**
     * 查询所有的用户
     * @return
     */
    List<UserDO> listAllUser();

    /**
     * 根据id查询用户
     * @param id
     * @return
     */
    UserDO getUserById(Integer id);
}

2.9、UserMapper.xml

<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="org.star.mapper.UserMapper">

    <insert id="saveUser">
        insert into `user`(username,password,age) values (#{username},#{password},#{age})
    </insert>


    <select id="listAllUser" resultType="userDO">
        select * from `user`
    </select>

    <select id="getUserById" resultType="userDO">
        select * from `user` where id = #{id}
    </select>
</mapper>

2.10、UserService

/**
 * @Author : 一叶浮萍归大海
 * @Date: 2023/11/6 11:36
 * @Description:
 */
@Service
public class UserService {

    @Autowired
    private UserMapper userMapper;

    @Transactional(propagation = Propagation.REQUIRED,rollbackFor = Exception.class)
    public List<UserDO> listAllUser() {

        return userMapper.listAllUser();
    }

    public void saveUser(UserDO param) {
        userMapper.saveUser(param);
    }

    /**
     * 不加此注解的话，将会执行多次数据库查询
     * 参考：https://blog.51cto.com/u_15942107/6019692
     * @param id
     * @return
     */
    @Transactional(propagation = Propagation.REQUIRED,rollbackFor = Exception.class)
    public UserDO getUserById(Integer id) {
        UserDO u1 = userMapper.getUserById(id);
        UserDO u2 = userMapper.getUserById(id);
        UserDO u3 = userMapper.getUserById(id);
        System.out.println(u1);
        System.out.println(u2);
        System.out.println(u3);

        return userMapper.getUserById(id);
    }
}

2.11、UserController

@Slf4j
@RestController
public class UserController {

    @Autowired
    private UserService userService;

    @PostMapping("/saveUser")
    public String saveUser(@RequestBody UserDO param) {
        log.info("UserController saveUser param:{}", param);
        userService.saveUser(param);
        return "SUCCESS";
    }

    @GetMapping("/listAllUser")
    public List<UserDO> listAllUser() {
        log.info("=================>listAllUser");
        return userService.listAllUser();
    }

    @GetMapping("/getUserById/{id}")
    public UserDO getUserById(@PathVariable("id") Integer id) {
        log.info("=================>getUserById id:{}",id);
        return userService.getUserById(id);
    }

}

三、测试

http://localhost:8080/listAllUser

四、项目结构

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