SSM整合（SpringMVC + Spring + MyBatis）

2021-04-18 11:40 251人阅读评论(0)

文章目录

完整工程已上传到GitHub：[传送门](https://github.com/877254169/ssm-template.git)
maven依赖
MyBatis整合
Spring整合
SpringMVC整合
注意事项

完整工程已上传到GitHub：传送门

新建一个空的maven项目

maven依赖

<?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>

    <groupId>cn.jam</groupId>
    <artifactId>ssm-template</artifactId>
    <version>1.0-SNAPSHOT</version>

    <!--依赖-->
    <dependencies>
        <!--Junit-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>

        <!--数据库驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.38</version>
        </dependency>

        <!--数据库连接池-->
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.5</version>
        </dependency>

        <!--servlet-jsp-->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>3.0-alpha-1</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.2</version>
        </dependency>
        <dependency>
            <groupId>jstl</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>

        <!--MyBatis-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.2</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.6</version>
        </dependency>

        <!--Spring-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.8.10</version>
        </dependency>

        <!--FastJson-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.76</version>
        </dependency>

        <!--Lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.18</version>
        </dependency>
    </dependencies>


    <!--静态资源导出问题-->
    <build>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
        </resources>
    </build>

</project>

MyBatis整合

创建用于测试的POJO：

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Books {
   
    /**
     * id
     */
    private long bookId;
    /**
     * 书名
     */
    private String bookName;
    /**
     * 数量
     */
    private int bookCounts;
    /**
     * 描述
     */
    private String detail;
}

Books的Mapper接口：

public interface BookMapper {
   
    /**
     * 通过id查询Book对象
     * @param id bookId
     * @return Book对象
     */
    Books queryBookById(@Param("bookId") long id);
}

BookMapper的xml文件：

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="cn.jam.dao.BookMapper">
    <select id="queryBookById" parameterType="long" resultType="Books">
        select * from books where bookId = #{bookId};
    </select>
</mapper>

在resources目录下创建MyBaits的配置文件“MyBaits-config.xml”：

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>

    <!--注意配置的顺序-->

        <settings>
            <!-- 打印SQL-->
            <setting name="logImpl" value="STDOUT_LOGGING"/>
    <!--        &lt;!&ndash; 开启延迟加载 &ndash;&gt;-->
    <!--        <setting name="lazyLoadingEnabled" value="true"/>-->
    <!--        &lt;!&ndash; 开启二级缓存 &ndash;&gt;-->
    <!--        <setting name="cacheEnabled" value="true"/>-->
        </settings>

    <typeAliases>
    	<!--对这个目录下的POJO启用别名-->
        <package name="cn.jam.pojo"/>
    </typeAliases>

    <!--在spring-dao.xml配置了扫描，这里不用每次注册-->
<!--    <mappers>-->
<!--        <mapper class="cn.jam.dao.BookMapper"/>-->
<!--    </mappers>-->

</configuration>

添加数据库信息的配置文件“database.properties”：

jdbc.driver=com.mysql.jdbc.Driver
#如果是用的MySQL 8.0+，这里要加时区的配置：&serverTimezone=Asia/Shanghai
jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?useUnicode=true&amp;characterEncoding=UTF-8
jdbc.username=root
jdbc.password=root

MyBatis中的连接池、mapper.xml等不在mybatis-config.xml里配置，都通过Spring来配置

Spring整合

首先添加Spring的applicationContext.xml，它包含其他相关的Spring配置文件。

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

</beans>

通过spring-dao.xml配置dao的部分，整合Mybatis。

<?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"
       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">

    <!--1.关联数据库配置文件-->
    <context:property-placeholder location="classpath:database.properties"/>

    <!--2.连接池
        dbcp：半自动化操作，不能自动连接
        c3p0：自动化操作，自动加载配置文件，可以自动设置到对象中
        druid
        hikari-->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driver}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>

        <!--c3p0私有属性-->
        <!--连接池大小-->
        <property name="maxPoolSize" value="30"/>
        <property name="minPoolSize" value="10"/>
        <!--关闭连接后不自动commit-->
        <property name="autoCommitOnClose" value="false"/>
        <!--连接超时时间-->
        <property name="checkoutTimeout" value="10000"/>
        <!--获取连接失败重试次数-->
        <property name="acquireRetryAttempts" value="2"/>
    </bean>

	<!--使用spring的数据源代替mybatis的，和c3p0相比，配置会简单点，但也就没那么灵活-->
<!--    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">-->
<!--        <property name="driverClassName" value="${jdbc.driver}"/>-->
<!--        <property name="url" value="${jdbc.url}"/>-->
<!--        <property name="username" value="${jdbc.username}"/>-->
<!--        <property name="password" value="${jdbc.password}"/>-->
<!--    </bean>-->

    <!--3.SqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <!--mybatis 配置文件-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
        <!--配置mapper配置文件-->
        <property name="mapperLocations" value="classpath:cn/jam/dao/*.xml"/>
    </bean>

    <!--配置dao接口扫描包，动态的实现dao接口可以注入到Spring容器中-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--注入SqlSessionFactory-->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <!--要扫描的dao包-->
        <property name="basePackage" value="cn.jam.dao"/>
    </bean>

</beans>

通过spring-service.xml配置service层，通过AOP切入事务

<?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">

    <!--1.扫描service下的包-->
    <context:component-scan base-package="cn.jam.service"/>

    <!--2.将我们所有业务类，注入Spring，可以通过配置，也可以通过注解，这里用注解-->

    <!--3.声明式事务-->
    <bean id="dataSourceTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <!--注入数据源-->
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!--4.aop事务支持-->
    <!--结合AOP，实现事务的织入-->
    <tx:advice id="txAdvice" transaction-manager="dataSourceTransactionManager">
        <tx:attributes>
            <!--配置那些方法要织入事务，*代表所有方法-->
            <tx:method name="*" propagation="REQUIRED"/>
        </tx:attributes>
    </tx:advice>

    <!--配置AOP切入事务-->
    <aop:config>
        <aop:pointcut id="txCutPoint" expression="execution(* cn.jam.dao.*.*(..))"/>
        <aop:advisor advice-ref="txAdvice" pointcut-ref="txCutPoint"/>
    </aop:config>

</beans>

将spring-dao.xml、spring-service.xml加到applicationContext.xml中

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

    <import resource="classpath:spring-dao.xml"/>
    <import resource="classpath:spring-service.xml"/>

</beans>

编写service层中的BookService：

public interface BookService {
   
    /**
     * 通过id查找Book对象
     * @param id id
     * @return Book对象
     */
    Books queryBookById(long id);
}

@Service
public class BookServiceImpl implements BookService {
   

    private final BookMapper bookMapper;

    /** Spring4.x之后，使用构造器就可以不需要@Autowired注解 */
    public BookServiceImpl(BookMapper bookMapper) {
   
        this.bookMapper = bookMapper;
    }

    public Books queryBookById(long id) {
   
        return bookMapper.queryBookById(id);
    }
}

SpringMVC整合

因为以开始是建的普通maven工程，在整合SpringMVC之前需要先配置web框架：
加好web框架后，先需要在web.xml中，配上SpringMVC的DispatchServlet、处理乱码的filter等

<?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">

    <!--dispatchServlet-->
    <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:applicationContext.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!--乱码过滤-->
    <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>
    </filter>
    <filter-mapping>
        <filter-name>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!--Session-->
    <session-config>
        <!--session过期时间，15min-->
        <session-timeout>15</session-timeout>
    </session-config>
</web-app>

web.xml处理好后，开始写mvc的配置文件spring-mvc.xml，同时，要记得import到applicationContext.xml中

<?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:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">

    <!--1.注解驱动，即handlerMapping、handlerAdapt-->
    <mvc:annotation-driven/>

    <!--2.静态资源过滤，防止通过请求直接拿到静态资源-->
    <mvc:default-servlet-handler/>

    <!--3.扫描包：controller-->
    <context:component-scan base-package="cn.jam.controller"/>

    <!--4.视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

</beans>

编写测试用的BookController

@Controller
public class BookController {
   

    private BookService bookService;

    public BookController(BookService bookService) {
   
        this.bookService = bookService;
    }

    @RequestMapping("query/{bookId}")
    public String queryById(@PathVariable("bookId") long id, Model model) {
   
        Books book = bookService.queryBookById(id);
        model.addAttribute("book", JSON.toJSONString(book));
        return "book";
    }

}

在WEB-INF下新建一个jsp目录，存放jsp页面，同时新建一个book.jsp页面，来展示BookController返回的Book对象

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>

    ${book}

</body>
</html>

测试一下（我这里是本地已经有数据了，所以可以查到）：
最后，这是整个工程的目录结构，以供参考

注意事项

如果使用IDEA，需要检查依赖的jar有没有以前打包到war包里，没有的话可以自己建一个lib目录，手动把jar加进来

转载：https://blog.csdn.net/qq_33954947/article/details/115681512

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SSM整合（SpringMVC + Spring + MyBatis）

文章目录

完整工程已上传到GitHub：传送门

maven依赖

MyBatis整合

Spring整合

SpringMVC整合

注意事项

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