SSM整合

作者: 伍陆柒_ | 来源:发表于2018-09-04 11:37 被阅读0次

    框架整合思路

    springmvc+mybaits的系统架构


    image.png

    spring将各层进行整合
    通过spring管理持久层的mapper(相当于dao接口)
    通过spring管理业务层service,service中可以调用mapper接口。
    通过spring进行事务控制(原子性)。
    通过spring管理表现层Controller,Controller中可以调用service接口。
    通过spring管理mapper、service、Controller,因为都是。

    所需的jar包

    mysql数据库驱动包
    mybatis的jar包
    mybatis和spring整合包
    log4j包
    druid数据库连接池包
    spring所有jar包

    工程结构

    image.png

    第一步:整合dao层

    mybatis和spring整合,通过spring管理mapper接口。
    使用mapper的扫描器自动扫描mapper接口在spring中进行注册。

    数据库服务器配置文件
    在classpath下创建db.properties

    #配置信息采取name = value的形式
    #1.配置驱动程序
    jdbc.driver =com.mysql.jdbc.Driver
    #2.配置数据库url
    jdbc.url = jdbc:mysql://localhost:3306/coder_school?useUnicode=true&characterEncoding=UTF-8
    #3.配置用户名
    jdbc.username=root
    #4.配置用户密码
    jdbc.password=root
    

    日志配置文件
    在classpath下创建log4j.properties

    # Global logging configuration
    #\u751F\u4EA7\u73AF\u5883\u914D\u7F6Einfo   ERROR
    log4j.rootLogger=DEBUG,stdout
    # MyBatis logging configuration...
    log4j.logger.org.mybatis.example.BlogMapper=TRACE
    # Console output...
    log4j.appender.stdout=org.apache.log4j.ConsoleAppender
    log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
    log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n
    

    Mybatis配置文件
    在classpath下创建mybatis/SqlMapConfig.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>
        <typeAliases>
            <package name="school.coder.domain"></package>
        </typeAliases>
    </configuration>
    

    spring管理SqlSessionFactory、mapper
    在classpath下创建applicationContext-dao.xml
    配置数据源

    <?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"
        xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
        xsi:schemaLocation="http://www.springframework.org/schema/beans 
            http://www.springframework.org/schema/beans/spring-beans-4.0.xsd 
            http://www.springframework.org/schema/mvc 
            http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd 
            http://www.springframework.org/schema/context 
            http://www.springframework.org/schema/context/spring-context-4.0.xsd 
            http://www.springframework.org/schema/aop 
            http://www.springframework.org/schema/aop/spring-aop-4.0.xsd 
            http://www.springframework.org/schema/tx 
            http://www.springframework.org/schema/tx/spring-tx-4.0.xsd ">
        <!-- 加载db.properties文件中的内容,db.properties文件中key命名要有一定的特殊规则 -->
        <context:property-placeholder location="classpath:db.properties" />
        <!-- 配置数据源 ,dbcp -->
        <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
            <!-- 基本属性 url、user、password -->
            <property name="url" value="${jdbc.url}" />
            <property name="username" value="${jdbc.username}" />
            <property name="password" value="${jdbc.password}" />
    
            <!-- 配置初始化大小、最小、最大 -->
            <property name="initialSize" value="20" />
            <property name="minIdle" value="1" />
            <property name="maxActive" value="50" />
    
            <!-- 配置获取连接等待超时的时间 -->
            <property name="maxWait" value="60000" />
    
            <!-- 配置间隔多久才进行一次检测,检测需要关闭的空闲连接,单位是毫秒 -->
            <property name="timeBetweenEvictionRunsMillis" value="60000" />
    
            <!-- 配置一个连接在池中最小生存的时间,单位是毫秒 -->
            <property name="minEvictableIdleTimeMillis" value="300000" />
    
            <property name="validationQuery" value="SELECT 'x'" />
            <property name="testWhileIdle" value="true" />
            <property name="testOnBorrow" value="false" />
            <property name="testOnReturn" value="false" />
    
            <!-- 打开PSCache,并且指定每个连接上PSCache的大小 -->
            <property name="poolPreparedStatements" value="true" />
            <property name="maxPoolPreparedStatementPerConnectionSize" value="20" />
    
            <!-- 配置监控统计拦截的filters,去掉后监控界面sql无法统计 -->
            <property name="filters" value="stat" />
        </bean>
        
        <!-- sqlSessionFactory -->
        <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
            <!-- 数据库连接池 -->
            <property name="dataSource" ref="dataSource" />
            <!-- 加载mybatis的全局配置文件 -->
            <property name="configLocation" value="classpath:SqlMapConfig.xml" />
        </bean>
        
        <!-- mapper扫描器 -->
        <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
            <!-- 扫描包路径,如果需要扫描多个包,中间使用半角逗号隔开 -->
            <property name="basePackage" value="com.neuedu.mapper"></property>
            <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
        </bean>
    </beans>
    

    第二步:整合service层

    通过spring管理service接口,使用配置方式将service接口配置在spring配置文件applicationContext-service.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"
        xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
        xsi:schemaLocation="http://www.springframework.org/schema/beans 
            http://www.springframework.org/schema/beans/spring-beans-3.2.xsd 
            http://www.springframework.org/schema/mvc 
            http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd 
            http://www.springframework.org/schema/context 
            http://www.springframework.org/schema/context/spring-context-3.2.xsd 
            http://www.springframework.org/schema/aop 
            http://www.springframework.org/schema/aop/spring-aop-3.2.xsd 
            http://www.springframework.org/schema/tx 
            http://www.springframework.org/schema/tx/spring-tx-3.2.xsd ">
            <context:component-scan base-package="com.neuedu.service.impl"></context:component-scan>
    </beans>
    

    实现事务控制。
    Spring管理service bean,并进行事务控制
    定义service接口
    applicationContext-transaction.xml中使用spring声明式事务控制方法

    <?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"
        xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
        xsi:schemaLocation="http://www.springframework.org/schema/beans 
            http://www.springframework.org/schema/beans/spring-beans-4.0.xsd 
            http://www.springframework.org/schema/mvc 
            http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd 
            http://www.springframework.org/schema/context 
            http://www.springframework.org/schema/context/spring-context-4.0.xsd 
            http://www.springframework.org/schema/aop 
            http://www.springframework.org/schema/aop/spring-aop-4.0.xsd 
            http://www.springframework.org/schema/tx 
            http://www.springframework.org/schema/tx/spring-tx-4.0.xsd ">
    
        <!-- 事务管理器 ,对mybatis操作数据库事务控制,spring使用jdbc的事务控制类-->
        <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
            <property name="dataSource" ref="dataSource"/>
        </bean>
        <tx:annotation-driven transaction-manager="transactionManager"></tx:annotation-driven>
    </beans>
    

    测试service,在方法实现上添加 @Transactional注解测试事务是否生效。

    package com.neuedu.service.impl;
    
    import java.io.IOException;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    import org.springframework.transaction.annotation.Transactional;
    
    import com.neuedu.bean.Commentinfo;
    import com.neuedu.mapper.CommentMapper;
    import com.neuedu.service.CommentService;
    @Service
    public class CommentServiceImpl implements CommentService{
        @Autowired
        CommentMapper cm;
        @Override
        @Transactional // 控制事务原子性,要么全成功,要么全失败
        public int addComment(Commentinfo comm) throws IOException {
            int num1 = cm.addComment(comm);
            int num2 = cm.updateCommNum(comm);
            return num1;
        }
    }
    

    第三步:整合springmvc

    由于springmvc是spring的模块,不需要整合。
    springmvc.xml配置文件
    在classpath下创建springmvc.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-4.0.xsd
            http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
         <!-- context:component-scan 扫描指定包下的注解,默认启动注解 -->
         <context:component-scan base-package="com.neuedu.controller"></context:component-scan>
         <!-- 视图资源解析器 -->
         <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
            <property name="prefix" value="/WEB-INF/jsp/"></property>
            <property name="suffix" value=".jsp"></property>
         </bean>
         <!-- 静态资源访问  -->
         <mvc:annotation-driven></mvc:annotation-driven>
         <mvc:resources location="/res/" mapping="/res/**"/>
         <mvc:resources location="/upload/" mapping="/upload/**"/>
         <!-- 配置默认首页 -->
         <mvc:view-controller path="/" view-name="redirect:/article/loadindex" />
         <!-- 文件上传 -->
         <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
               <property name="maxUploadSize" value="10000000"></property>
               <property name="defaultEncoding" value="UTF-8"></property>
         </bean>
         <!-- 拦截器 -->
         <mvc:interceptors>
            <mvc:interceptor>
                 <mvc:mapping path="/page/add" />
                 <bean class="com.neuedu.interceptor.CheckInterceptor"></bean>
            </mvc:interceptor>
         </mvc:interceptors>
    </beans>
    

    第四步:web.xml配置文件

    配置前端控制器
    在web.xml中,添加spring容器监听器,加载spring容器。

    <?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_3_0.xsd" id="WebApp_ID" version="3.0">
        <!-- tomcat服务器,一启动马上读取applicationContext-*.xml -->
        <context-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:applicationContext-*.xml</param-value>
        </context-param>
        <!-- tomcat服务器,一启动就加载spring框架的ContextLoaderListener意味着,spring容器启动,开始作用 -->
        <listener>
            <listener-class>
                org.springframework.web.context.ContextLoaderListener
            </listener-class>
        </listener>
       <!-- 404页面 -->!
        <error-page>
          <error-code>404</error-code>
          <location>/jsp/404.jsp</location>
        </error-page>
      <!-- 中央控制器 -->
        <servlet>
            <servlet-name>springDispatcherServlet</servlet-name>
            <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
            <init-param>
                <param-name>contextConfigLocation</param-name>
                <param-value>classpath:springmvc.xml</param-value>
            </init-param>
            <load-on-startup>1</load-on-startup>
        </servlet>
        <servlet-mapping>
            <servlet-name>springDispatcherServlet</servlet-name>
            <url-pattern>/</url-pattern>
        </servlet-mapping>
      <!-- 处理中文乱码 -->
        <filter>
            <filter-name>characterEncodingFilter</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>forceEncoding</param-name>
                <param-value>true</param-value>
            </init-param>
        </filter>
        <filter-mapping>
            <filter-name>characterEncodingFilter</filter-name>
            <url-pattern>/*</url-pattern>
        </filter-mapping>
    </web-app>
    

    将Controller层中Service对象及Service层实现类中的Mapper对象,修改为注解自动装配,三大框架整合完毕,编写测试程序验证。

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