SSM整合

Posted 2021-03-11 zomicc

本文介绍spring、springmvc、mybatis的整合。

　　应用系统三层架构分为：表现层（也就是我们通常说的mvc）、业务层（service层）、持久层（dao层）。

　　如下所示，我们就按照这层次对SSM进行整合。配置文件分门别类：

　　　　表现层：springmvc-servlet.xml（配置controller、springmvc各大组件）

　　　　业务层：applicationContext-servlet.xml（配置service、声明式事务）

　　　　持久层：applicationContext-dao.xml、db.properties（配置dao、数据源、mapper映射）

　　　　web配置：web.xml（加载以上配置）

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 1、整合前，需要添加上pom约束。可参考如下：

<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>com.kkb</groupId>
    <artifactId>ssm-5</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>

    <dependencies>
        <!-- 持久层依赖 开始 -->
        <!-- spring ioc组件需要的依赖包 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>5.0.7.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>5.0.7.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.0.7.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-expression</artifactId>
            <version>5.0.7.RELEASE</version>
        </dependency>

        <!-- spring 事务管理和JDBC依赖包 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>5.0.7.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.0.7.RELEASE</version>
        </dependency>

        <!-- mysql数据库驱动包 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.35</version>
        </dependency>

        <!-- dbcp连接池的依赖包 -->
        <dependency>
            <groupId>commons-dbcp</groupId>
            <artifactId>commons-dbcp</artifactId>
            <version>1.4</version>
        </dependency>

        <!-- mybatis依赖 -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.5</version>
        </dependency>

        <!-- mybatis和spring的整合依赖 -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.1</version>
        </dependency>

        <!-- 持久层依赖 结束 -->

        <!-- 业务层依赖 开始 -->
        <!-- 基于AspectJ的aop依赖 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aspects</artifactId>
            <version>5.0.7.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>aopalliance</groupId>
            <artifactId>aopalliance</artifactId>
            <version>1.0</version>
        </dependency>
        <!-- 业务层依赖 结束 -->


        <!-- 表现层依赖 开始 -->
        <!-- spring MVC依赖包 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.0.7.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>5.0.7.RELEASE</version>
        </dependency>

        <!-- jstl 取决于视图对象是否是JSP -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>


        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>5.0.7.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-oxm</artifactId>
            <version>5.0.7.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>com.thoughtworks.xstream</groupId>
            <artifactId>xstream</artifactId>
            <version>1.4.10</version>
        </dependency>


        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.9.6</version>
        </dependency>


        <!-- 表现层依赖 结束 -->

        <!-- spring 单元测试组件包 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>5.0.7.RELEASE</version>
        </dependency>

        <!-- 单元测试Junit -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>

        <!-- Mock测试使用的json-path依赖 -->
        <dependency>
            <groupId>com.jayway.jsonpath</groupId>
            <artifactId>json-path</artifactId>
            <version>2.2.0</version>
        </dependency>


        <!-- 文件上传 -->
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3.1</version>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <!-- 配置Maven的JDK编译级别 -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.2</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>

            <plugin>
                <groupId>org.apache.tomcat.maven</groupId>
                <artifactId>tomcat7-maven-plugin</artifactId>
                <version>2.2</version>
                <configuration>
                    <path>/</path>
                    <port>80</port>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

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2、dao层：mapper映射、PO类，可直接适用mybatis逆向工程生成。不是重点，此文直接省略。

3、service层的代码如下。　

package com.kkb.ssm.service;

import java.util.List;

import com.kkb.ssm.po.Hero;

public interface HeroService {
    List<Hero> findHeros();
}

package com.kkb.ssm.service;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.kkb.ssm.mapper.HeroMapper;
import com.kkb.ssm.po.Hero;

@Service
public class HeroServiceImpl implements HeroService {

    @Autowired
    private HeroMapper mapper;
    
    @Override
    public List<Hero> findHeros() {
        return mapper.selectByExample(null);
    }

}

4、controller代码如下。

package com.kkb.ssm.controller;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import com.kkb.ssm.po.Hero;
import com.kkb.ssm.service.HeroService;

@Controller
public class HeroController {

    @Autowired
    private HeroService heroService ;
    
    @RequestMapping("findHeros")
    @ResponseBody
    public List<Hero> findHeros(){
        return heroService.findHeros()  ;
    }
}

 

---

至此，代码就已经写完了。重点看接下来的配置。

---

 1、表现层配置。

　　springmvc-servlet.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
        http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <context:component-scan base-package="com.kkb.ssm.controller"/>
    
    <!-- 配置【处理器映射器】RequestMappingHandlerMapping和【处理器适配器】RequestMappingHandlerAdapter -->
    <mvc:annotation-driven/>
    
    <!-- 【视图解析器】 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>
    
    ~~~~~~如下是一些文件上传和String类型转Date类型的配置（暂保留）~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    <!-- 配置【文件上传解析器】 -->
    <bean id="multipartResolver" 
        class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <!-- 上传文件最大大小，5M。单位为字节 -->
        <property name="maxUploadSize" value="5242880"></property>
        <property name="defaultEncoding" value="UTF-8"></property>    
    </bean>
    
    <!-- 配置String转Date【类型转换器】。springmvc中已经内置了常用的类型转化器，这里只需要加入用户自定义的转换器  -->
    <!-- 加载注解驱动器 -->
    <mvc:annotation-driven conversion-service="conversionService" />
    <!-- 转换器配置 -->
    <bean id="conversionService" 
    class="org.springframework.format.support.FormattingConversionServiceFactoryBean">
        <property name="converters">
            <set>
                <bean class="com.kkb.ssm.controller.converter.DateConverter"></bean>
            </set>
        </property>
    </bean>
</beans>
    

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2、持久层配置。

　　applicationContext-dao.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"
    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">

    <context:property-placeholder location="classpath:db.properties"/>
    <!-- 配置数据源 -->
    <bean id="dataSource"
        class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="${jdbc.driver}" />
        <property name="url" value="${jdbc.url}" />
        <property name="username" value="${jdbc.username}" />
        <property name="password" value="${jdbc.password}" />
        <property name="maxActive" value="30" />
        <property name="maxIdle" value="5" />
    </bean>
    
    <!-- 配置SqlSessionFacotory -->
    <bean id="sqlSessionFactory"
        class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 配置数据源 -->
        <property name="dataSource" ref="dataSource" />
        <property name="typeAliasesPackage" value="com.kkb.ssm.po"></property>
        <!-- 因为dataSource（如上）和mapper（如下）的配置已经移到spring中了，所以一般不建议再配置configLocation。因为已经不需要mybatis本身的配置文件了 -->
        <!-- <property name="configLocation" value="classpath:mybatis-cfg.xml"></property> -->
    </bean>
    
    <!-- 配置mapper扫描器。SqlSessionConfig.xml中的mapper配置去掉 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.kkb.ssm.mapper"></property>
    </bean>
    
</beans>

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　　db.properties：

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://47.105.173.112:3306/hero?characterEncoding=utf8
jdbc.username=root
jdbc.password=root

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3、业务层配置。

　　applicationContext-service.xml：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:tx="http://www.springframework.org/schema/tx"
    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
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
    http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">

    <!-- 扫描Service -->
    <context:component-scan
        base-package="com.kkb.ssm.service" />
        
    <import resource="classpath:applicationContext-dao.xml"/>
    <!-- 配置事务 -->
    <!-- 对mybatis的数据库操作进行事务配置，此处使用jdbc事务管理 -->
    <bean id="transactionManager"
        class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <!-- 指定要进行事务管理的数据源 -->
        <property name="dataSource" ref="dataSource"></property><!-- 可以直接引用dao配置中的数据源 -->
    </bean>
    
    <!-- spring声明式事务配置 -->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <!-- 传播行为 -->
            <tx:method name="save*" propagation="REQUIRED" />
            <tx:method name="add*" propagation="REQUIRED" />
            <tx:method name="insert*" propagation="REQUIRED" />
            <tx:method name="delete*" propagation="REQUIRED" />
            <tx:method name="del*" propagation="REQUIRED" />
            <tx:method name="remove*" propagation="REQUIRED" />
            <tx:method name="update*" propagation="REQUIRED" />
            <tx:method name="modify*" propagation="REQUIRED" />
            <tx:method name="find*" read-only="true" />
            <tx:method name="query*" read-only="true" />
            <tx:method name="select*" read-only="true" />
            <tx:method name="get*" read-only="true" />
        </tx:attributes>
    </tx:advice>
    <aop:config>
        <aop:advisor advice-ref="txAdvice" pointcut="execution(* *..*.*ServiceImpl.*(..))"/>
    </aop:config>

</beans>

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 4、web.xml。--加载以上3个配置文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
  <display-name>springmvc20200205</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  
      <servlet>
          <servlet-name>springmvc</servlet-name>
          <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
          <init-param>
              <param-name>contextConfigLocation</param-name>
              <!-- 通过DispatcherServlet加载mvc配置。子容器 -->
              <param-value>classpath:springmvc-servlet.xml</param-value>
          </init-param>
          <!-- 配置为2表示tomcat启动时，dispatcherServlet会跟着初始化。如果不指定初始化时机，DispatcherServlet就会在第一次请求的时候被初始化 -->
          <load-on-startup>2</load-on-startup>
      </servlet>
      <servlet-mapping>
          <servlet-name>springmvc</servlet-name>
          <url-pattern>/</url-pattern>
      </servlet-mapping>
      
      <!-- 通过ContextLoaderListener加载持久层和业务层配置文件。父容器 -->
      <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>
      
      <!-- <error-page>
          <error-code>404</error-code>
          <location>/error.jsp</location>
      </error-page> -->
</web-app>

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