框架整合之SSM——Spring、SpringMVC、Mybaits

爱被打了一巴掌 2022-05-25 02:26 232阅读 0赞

在前面的博文中，依次介绍了Spring、Spring mvc、Mybaits框架的功能及使用。在之前的博文中都是单独的介绍，尤其是Mybaits框架，在例子中跟本就没有用到其它的框架，这说明了他们的独立性，但反观之前的Mybaits的例子，测试的时候总是要先创建sqlSession，再获取mapper接口的动态代理对象，然后才能调用mapper对象的方法，而这些代码都是必须且重复的，十分的不便。这时，Spring的作用就发挥出来了。我们可以实现将所有对象创建和依赖关系维护交给Spring管理，Spring本身就是一个大工厂，负责bean的生产。

一般来说，先整合Spring和SpringMVC，再整合Spring和Mybaits，不过为了方便，我就直接发代码了，不分步骤，xml文件中会有详细的注释说明。以《JavaWeb高级编程》一书中的Discussion-Board工程为例，这个工程本身只是整合了Spring与Spring MVC，我在此工程的基础上添加了MySQL数据库并以Mybaits为框架，有略作修改。

首先是工程的整体结构目录：

![70][]

这个工程的结构与普通直接创建的MAVEN工程有些不同，这是因为我在pom.xml文件中做了设置，只是个人喜好，不同也没有关系。

接下来是Maven的pom.xml文件

我就不显示我是怎么设置的了，其中有很多不需要的包，各种包有注释说明，依据个人需求吧，并不需要全部都写

<properties>
    		
    		
    		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    		<plugin.version>2.6</plugin.version>
    		<project.build.name>tools</project.build.name>
    		
    		<spring.version>4.3.13.RELEASE</spring.version>
    		
    		<mybatis.version>3.4.1</mybatis.version>
    		
    		<org.slf4j.version>1.7.25</org.slf4j.version>
    		<logback.version>1.0.7</logback.version>
    		
    		<spring-security.version>4.1.2.RELEASE</spring-security.version>
    	</properties>
    	<dependencies>
    		
    		<dependency> 
    			<groupId>org.springframework</groupId>
    			<artifactId>spring-core</artifactId>
    			<version>${spring.version}</version>
    		</dependency>
    
    		<dependency>
    			<groupId>org.springframework</groupId>
    			<artifactId>spring-web</artifactId>
    			<version>${spring.version}</version>
    		</dependency>
    
    		<dependency>
    			<groupId>org.springframework</groupId>
    			<artifactId>spring-oxm</artifactId>
    			<version>${spring.version}</version>
    		</dependency>
    
    		<dependency>
    			<groupId>org.springframework</groupId>
    			<artifactId>spring-tx</artifactId>
    			<version>${spring.version}</version>
    		</dependency>
    
    		<dependency>
    			<groupId>org.springframework</groupId>
    			<artifactId>spring-jdbc</artifactId>
    			<version>${spring.version}</version>
    		</dependency>
    
    		<dependency>
    			<groupId>org.springframework</groupId>
    			<artifactId>spring-webmvc</artifactId>
    			<version>${spring.version}</version>
    		</dependency>
    
    		<dependency>
    			<groupId>org.springframework</groupId>
    			<artifactId>spring-aop</artifactId>
    			<version>${spring.version}</version>
    		</dependency>
    
    		<dependency>
    			<groupId>org.springframework</groupId>
    			<artifactId>spring-context-support</artifactId>
    			<version>${spring.version}</version>
    		</dependency>
    
    		<dependency>
    			<groupId>org.springframework</groupId>
    			<artifactId>spring-test</artifactId>
    			<version>${spring.version}</version>
    		</dependency>
    
    		<dependency>
    			<groupId>org.springframework</groupId>
    			<artifactId>spring-context</artifactId>
    			<version>${spring.version}</version>
    		</dependency>
    
    		<dependency>
    			<groupId>org.springframework</groupId>
    			<artifactId>spring-orm</artifactId>
    			<version>${spring.version}</version>
    		</dependency>
    
    		
    		<dependency>
    			<groupId>org.springframework.security</groupId>
    			<artifactId>spring-security-config</artifactId>
    			<version>${spring-security.version}</version>
    		</dependency>
    
    		<dependency>
    			<groupId>org.springframework.security</groupId>
    			<artifactId>spring-security-core</artifactId>
    			<version>${spring-security.version}</version>
    		</dependency>
    
    		<dependency>
    			<groupId>org.springframework.security</groupId>
    			<artifactId>spring-security-web</artifactId>
    			<version>${spring-security.version}</version>
    		</dependency>
    
    		<dependency>
    			<groupId>org.aspectj</groupId>
    			<artifactId>aspectjweaver</artifactId>
    			<version>1.8.7</version>
    		</dependency>
    
    		
    		<dependency>
    			<groupId>org.codehaus.jackson</groupId>
    			<artifactId>jackson-mapper-asl</artifactId>
    			<version>1.9.5</version>
    		</dependency>
    
    		
    		<dependency>
    			<groupId>org.mybatis</groupId>
    			<artifactId>mybatis</artifactId>
    			<version>${mybatis.version}</version>
    		</dependency>
    
    		
    		<dependency>
    			<groupId>org.mybatis</groupId>
    			<artifactId>mybatis-spring</artifactId>
    			<version>1.3.1</version>
    		</dependency>
    		
    		
    		
    		<dependency>
    			<groupId>org.mybatis.caches</groupId>
    			<artifactId>mybatis-ehcache</artifactId>
    			<version>1.1.0</version>
    		</dependency>
    		
    		<dependency>  
    		    <groupId>org.mybatis</groupId>  
    		    <artifactId>mybatis-typehandlers-jsr310</artifactId>  
    		    <version>1.0.1</version>  
    		</dependency> 
    		
    		
    		
    		<dependency>
    			<groupId>javax.persistence</groupId>
    			<artifactId>persistence-api</artifactId>
    			<version>1.0.2</version>
    		</dependency>
    		
    		
    		
    		<dependency>
    			<groupId>tk.mybatis</groupId>
    			<artifactId>mapper</artifactId>
    			<version>3.4.4</version>
    		</dependency>
    		
    		
    		
    		<dependency>
    			<groupId>com.github.pagehelper</groupId>
    			<artifactId>pagehelper</artifactId>
    			<version>4.2.1</version>
    		</dependency>
    
    		
    		
    		<dependency>
    			<groupId>org.mybatis.generator</groupId>
    			<artifactId>mybatis-generator-core</artifactId>
    			<version>1.3.5</version>
    		</dependency>
    		
    		
    		
    		<dependency>
    			<groupId>redis.clients</groupId>
    			<artifactId>jedis</artifactId>
    			<version>2.9.0</version>
    		</dependency>
    		
    		
    		
    		<dependency>
    			<groupId>org.springframework.data</groupId>
    			<artifactId>spring-data-redis</artifactId>
    			<version>2.0.2.RELEASE</version>
    		</dependency>
    		
    
    		
    		<dependency>
    			<groupId>junit</groupId>
    			<artifactId>junit</artifactId>
    			<version>4.12</version>
    			<scope>test</scope>
    		</dependency>
    
    		
    		<dependency>
    			<groupId>mysql</groupId>
    			<artifactId>mysql-connector-java</artifactId>
    			<version>5.1.40</version>
    		</dependency>
    
    		
    		<dependency>
    			<groupId>com.alibaba</groupId>
    			<artifactId>druid</artifactId>
    			<version>1.1.6</version>
    		</dependency>
    
    		
    		
    		<dependency>
    			<groupId>javax.servlet</groupId>
    			<artifactId>javax.servlet-api</artifactId>
    			<version>4.0.0</version>
    			<scope>provided</scope>
    		</dependency>
    
    		
    		<dependency>
    			<groupId>javax.servlet.jsp</groupId>
    			<artifactId>javax.servlet.jsp-api</artifactId>
    			<version>2.3.1</version>
    			<scope>provided</scope>
    		</dependency>
    
    		
    		
    		<dependency>
    			<groupId>org.slf4j</groupId>
    			<artifactId>slf4j-api</artifactId>
    			<version>${org.slf4j.version}</version>
    		</dependency>
    		
    		
    		
    		
    		
    	
    
    		<dependency>
    			<groupId>ch.qos.logback</groupId>
    			<artifactId>logback-classic</artifactId>
    			<version>${logback.version}</version>
    			<type>jar</type>
    			<scope>compile</scope>
    		</dependency>
    
    		<dependency>
    			<groupId>ch.qos.logback</groupId>
    			<artifactId>logback-core</artifactId>
    			<version>${logback.version}</version>
    			<type>jar</type>
    			<scope>compile</scope>
    		</dependency>
    		
    		
    		<dependency>
    			<groupId>org.logback-extensions</groupId>
    			<artifactId>logback-ext-spring</artifactId>
    			<version>0.1.4</version>
    		</dependency>
    		
    		
    		<dependency>
    			<groupId>jstl</groupId>
    			<artifactId>jstl</artifactId>
    			<version>1.2</version>
    		</dependency>
    
    		
    		<dependency>
    			<groupId>org.apache.taglibs</groupId>
    			<artifactId>taglibs-standard-impl</artifactId>
    			<version>1.2.5</version>
    		</dependency>
    		
    		
    		<dependency>
    			<groupId>commons-io</groupId>
    			<artifactId>commons-io</artifactId>
    			<version>2.4</version>
    		</dependency>
    
    		
    		<dependency>
    			<groupId>commons-beanutils</groupId>
    			<artifactId>commons-beanutils</artifactId>
    			<version>1.9.3</version>
    		</dependency>
    
    		
    		<dependency>
    			<groupId>commons-logging</groupId>
    			<artifactId>commons-logging</artifactId>
    			<version>1.2</version>
    		</dependency>
    
    		<dependency>
    			<groupId>commons-codec</groupId>
    			<artifactId>commons-codec</artifactId>
    			<version>1.9</version>
    		</dependency>
    
    		<dependency>
    			<groupId>org.apache.commons</groupId>
    			<artifactId>commons-lang3</artifactId>
    			<version>3.0</version>
    		</dependency>
    		
    		
    		<dependency>
    			<groupId>net.sf.json-lib</groupId>
    			<artifactId>json-lib</artifactId>
    			<version>2.4</version>
    			<classifier>jdk15</classifier>
    		</dependency>
    
    		
    		<dependency>
    			<groupId>org.apache.poi</groupId>
    			<artifactId>poi</artifactId>
    			<version>3.5-FINAL</version>
    		</dependency>
    		
    		
    		<dependency>
    			<groupId>com.google.code.gson</groupId>
    			<artifactId>gson</artifactId>
    			<version>2.1</version>
    		</dependency>
    
    		<dependency>
    			<groupId>org.json</groupId>
    			<artifactId>json</artifactId>
    			<version>20160212</version>
    		</dependency>
    
    		<dependency>
    			<groupId>com.alibaba</groupId>
    			<artifactId>fastjson</artifactId>
    			<version>1.2.17</version>
    		</dependency>
    		
    		
    		<dependency>
    			<groupId>cn.songxinqiang</groupId>
    			<artifactId>com.baidu.ueditor</artifactId>
    			<version>1.1.2-offical</version>
    		</dependency>
    		
    		
    		<dependency>
    			<groupId>commons-fileupload</groupId>
    			<artifactId>commons-fileupload</artifactId>
    			<version>1.3.1</version>
    			<type>jar</type>
    			<scope>compile</scope>
    		</dependency>
    		
    		
    		
    		<dependency>
    			<groupId>com.google.zxing</groupId>
    			<artifactId>core</artifactId>
    			<version>3.3.0</version>
    		</dependency>
    		
    		
    		<dependency>
    			<groupId>com.google.zxing</groupId>
    			<artifactId>javase</artifactId>
    			<version>3.3.0</version>
    		</dependency>
    		
    		
    		
    		<dependency>
    			<groupId>dom4j</groupId>
    			<artifactId>dom4j</artifactId>
    			<version>1.6.1</version>
    		</dependency>
    		
    		
    		
    		<dependency>
    			<groupId>com.thoughtworks.xstream</groupId>
    			<artifactId>xstream</artifactId>
    			<version>1.4.10</version>
    		</dependency>
    		
    		
    		<dependency>
    			<groupId>net.coobird</groupId>
    			<artifactId>thumbnailator</artifactId>
    			<version>0.4.8</version>
    		</dependency>
    		
    		
    		
    		<dependency>
    			<groupId>org.apache.httpcomponents</groupId>
    			<artifactId>httpcore</artifactId>
    			<version>4.4.6</version>
    		</dependency>
    		
    		
    		<dependency>
    			<groupId>org.apache.httpcomponents</groupId>
    			<artifactId>httpclient</artifactId>
    			<version>4.5.3</version>
    		</dependency>
    		
    		
    		<dependency>
    			<groupId>org.eclipse.persistence</groupId>
    			<artifactId>javax.persistence</artifactId>
    			<version>2.1.1</version>
    		</dependency>
    		
    		
    		
    		<dependency>
    			<groupId>org.freemarker</groupId>
    			<artifactId>freemarker</artifactId>
    			<version>2.3.23</version>
    		</dependency>
    		
    		
    		<dependency>
    			<groupId>com.ibeetl</groupId>
    			<artifactId>btjson</artifactId>
    			<version>0.94</version>
    		</dependency>
    
    		
    		<dependency>
    			<groupId>com.ibeetl</groupId>
    			<artifactId>beetl</artifactId>
    			<version>2.7.18</version>
    		</dependency>
    		
    		
    		
    		<dependency>
    			<groupId>org.quartz-scheduler</groupId>
    			<artifactId>quartz</artifactId>
    			<version>2.3.0</version>
    		</dependency>
    
    		
    		<dependency>
    			<groupId>org.quartz-scheduler</groupId>
    			<artifactId>quartz-jobs</artifactId>
    			<version>2.3.0</version>
    		</dependency>
    		
    		 
    	</dependencies>

然后是web.xml文件，主要是配置Spring和Spring MVC，我还配置了druid连接池监控

<?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">
      <display-name>Disscussion-Board</display-name>
      <welcome-file-list>
        <welcome-file>index.html</welcome-file>
        <welcome-file>index.jsp</welcome-file>
        
      </welcome-file-list>
      
     	<welcome-file-list>
    		<welcome-file>index.html</welcome-file>
    	</welcome-file-list>
    	
    	
    	<listener>
    		<listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
    	</listener>
    	
    	<listener>
    		<listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>
    	</listener>
    	
    	
    	
    	<context-param>
    		<param-name>contextConfigLocation</param-name>
    		
    		
    		<param-value>classpath:spring/applicationContext.xml</param-value>
    	</context-param>
    	
    	
    	<listener>
    		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    	</listener>
    	
    	
    	<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>forceEncoding</param-name>
    			<param-value>true</param-value>
    		</init-param>
    	</filter>
    	<filter-mapping>
    		<filter-name>encodingFilter</filter-name>
    		<url-pattern>/*</url-pattern>
    	</filter-mapping>
    
    	
    	<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:spring/applicationContext-mvc.xml</param-value>
    		</init-param>
    	</servlet>
    	<servlet-mapping>
    		<servlet-name>SpringMVC</servlet-name>
    		<url-pattern>/</url-pattern>
    	</servlet-mapping>
    	
    	
    	
    	
    	
    	<session-config>
    		<session-timeout>1440000</session-timeout>
    	</session-config>
    
    	
    	<servlet>
    		<servlet-name>DruidStatView</servlet-name>
    		<servlet-class>com.alibaba.druid.support.http.StatViewServlet</servlet-class>
    	</servlet>
    
    	<servlet-mapping>
    		<servlet-name>DruidStatView</servlet-name>
    		<url-pattern>/druid/*</url-pattern>
    	</servlet-mapping>
    
    	<filter>
    		<filter-name>druidWebStatFilter</filter-name>
    		<filter-class>com.alibaba.druid.support.http.WebStatFilter</filter-class>
    		<init-param>
    			<param-name>exclusions</param-name>
    			<param-value>/public/*,*.js,*.css,/druid*,*.jsp,*.swf</param-value>
    		</init-param>
    		<init-param>
    			<param-name>principalSessionName</param-name>
    			<param-value>sessionInfo</param-value>
    		</init-param>
    		<init-param>
    			<param-name>profileEnable</param-name>
    			<param-value>true</param-value>
    		</init-param>
    	</filter>
    
    	<filter-mapping>
    		<filter-name>druidWebStatFilter</filter-name>
    		<url-pattern>/*</url-pattern>
    	</filter-mapping>
    </web-app>

接下来是Spring的配置文件applicationContext.xml(这个是默认的名字，如果需要更改成其他名字，需要在web.xml文件中说明，怎么说明就请你自行百度了)，需要注意的是，文件配置中取消了对Controller层的扫描加载bean，因为控制将有SpringMVC控制，如果Spring又扫描的话，控制层的bean将会被扫描两遍，会引发一些莫名奇妙的错误。

<?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:aop="http://www.springframework.org/schema/aop"
    	xmlns:context="http://www.springframework.org/schema/context"
    	xmlns:mvc="http://www.springframework.org/schema/mvc"
    	xmlns:tx="http://www.springframework.org/schema/tx"
    	xmlns:mybatis-spring="http://mybatis.org/schema/mybatis-spring"
    	xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
    		http://mybatis.org/schema/mybatis-spring http://mybatis.org/schema/mybatis-spring-1.2.xsd
    		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-4.3.xsd
    		http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
    		http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">
    
        
    	<context:annotation-config />
    	
    	
    	<context:component-scan base-package="com.wrox">
    		<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    	</context:component-scan>
    	
    	
    	<bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
    		<property name="locations">
    			<list>
    				<value>classpath:config/dbconfig.properties</value>
    			</list>
    		</property>
    	</bean>
    	
    	
    	 <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
    		destroy-method="close">  
            
    		<property name="url" value="${url}" />
    		<property name="username" value="${username}" />
    		<property name="password" value="${password}" />
    		<property name="driverClassName" value="${driverClassName}" />
    		<property name="filters" value="${filters}" />  
       		
    		<property name="maxActive" value="${maxActive}" />
             
    		<property name="initialSize" value="${initialSize}" />
             
    		<property name="maxWait" value="${maxWait}" />
             
    		<property name="minIdle" value="${minIdle}" />  
       		
    		<property name="timeBetweenEvictionRunsMillis" value="${timeBetweenEvictionRunsMillis}" />
           
    		<property name="minEvictableIdleTimeMillis" value="${minEvictableIdleTimeMillis}" />
    		<property name="validationQuery" value="${validationQuery}" />
    		<property name="testWhileIdle" value="${testWhileIdle}" />
    		<property name="testOnBorrow" value="${testOnBorrow}" />
    		<property name="testOnReturn" value="${testOnReturn}" />
    		<property name="maxOpenPreparedStatements" value="${maxOpenPreparedStatements}" />
            
    		<property name="removeAbandoned" value="${removeAbandoned}" />
             
    		<property name="removeAbandonedTimeout" value="${removeAbandonedTimeout}" />
            
    		<property name="logAbandoned" value="${logAbandoned}" />
    	</bean>
    	
    	
    	<bean name="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    		<property name="dataSource" ref="dataSource"></property>
    	</bean>
    	
    	<aop:config>
    		<aop:pointcut id="pc"
    			expression="execution(* com.wrox.*.service..*.*(..))" />
    		<aop:advisor pointcut-ref="pc" advice-ref="txAdvice" />
    	</aop:config>
    	
    	 <tx:advice id="txAdvice" transaction-manager="transactionManager">
    		<tx:attributes>
    			<tx:method name="delete*" propagation="REQUIRED" read-only="false"
    				rollback-for="java.lang.Exception" />
    			<tx:method name="insert*" propagation="REQUIRED" read-only="false"
    				rollback-for="java.lang.Exception" />
    			<tx:method name="update*" propagation="REQUIRED" read-only="false"
    				rollback-for="java.lang.Exception" />
    			<tx:method name="save*" propagation="REQUIRED" read-only="false"
    				rollback-for="java.lang.Exception" />
    			<tx:method name="*Service" propagation="REQUIRED"
    				read-only="false" rollback-for="java.lang.Exception" />
    		</tx:attributes>
    	</tx:advice>
    	
    	
    	<aop:aspectj-autoproxy proxy-target-class="true" />
    	
    	
    	 <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
    		<property name="dataSource" ref="dataSource" />
    		<property name="configLocation" value="classpath:mybatis/sqlMapConfig.xml"></property>
            
    		<property name="mapperLocations" value="classpath*:mybatis/mapper/**/*.xml"></property>
    	</bean>
    	
    	
    	
    	
    	
    	
    	
    	
    	
    	
    	<mybatis-spring:scan base-package="com.wrox.*.mapper"/>
    </beans>

注意最后mybaits配置时，对mapper文件的自动加载生成代理对象的两种方式，理论上应该是两种方式都可以，但是我只能用没有被注释掉的一种，可能是前面那种发式哪里写错了，欢迎大家指出纠正。

接下来是Springmvc的配置文件applicationContext-mvc.xml(这个名字没有要求，自己爱怎么起就怎么起，但是要跟web.xml请求分发器中限定的文件名一致)

<?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/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
    		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
    		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">
    
        
    	<mvc:default-servlet-handler />  
    	
    	
    		
    	
    	
    	<context:component-scan
    		base-package="com.wrox.*.controller"
    		use-default-filters="false">
    		<context:include-filter type="annotation"
    			expression="org.springframework.stereotype.Controller" />
    		<context:include-filter type="annotation"
    			expression="org.springframework.web.bind.annotation.ControllerAdvice" />
    	</context:component-scan>
    
    	<mvc:annotation-driven>
    		<mvc:message-converters register-defaults="true">
    			
    			<bean class="org.springframework.http.converter.StringHttpMessageConverter">
    				<constructor-arg value="UTF-8" />
    				<property name="supportedMediaTypes">
    					<list>
    						<bean class="org.springframework.http.MediaType">
    							<constructor-arg index="0" value="text" />
    							<constructor-arg index="1" value="plain" />
    							<constructor-arg index="2" value="UTF-8" />
    						</bean>
    						<bean class="org.springframework.http.MediaType">
    							<constructor-arg index="0" value="*" />
    							<constructor-arg index="1" value="*" />
    							<constructor-arg index="2" value="UTF-8" />
    						</bean>
    					</list>
    				</property>
    			</bean>
    			
    			<bean id="fastJsonHttpMessageConverter"
    				class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter">
    				<property name="supportedMediaTypes">
    					<list>
    						<value>application/json;charset=UTF-8</value>
    					</list>
    				</property>
    			</bean>
    		</mvc:message-converters>
    	</mvc:annotation-driven>
    	
    	
    	<mvc:interceptors>
    		<bean class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor" />
    	</mvc:interceptors>
    	
    	
        
    	<bean id="contentNegotiationManager"
    		class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean">
            
    		<property name="favorPathExtension" value="true" />
            
    		<property name="favorParameter" value="true" />
    		<property name="parameterName" value="format" />
            
    		<property name="ignoreAcceptHeader" value="false" />
    
    		<property name="mediaTypes"> 
    			<value>
    				json=application/json
    				xml=application/xml
    				html=text/html
    			</value>
    		</property>
            
    		<property name="defaultContentType" value="text/html" />
    	</bean>
    	
    	
    	
    	<bean id="defaultViewResolver"
    		class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    		<property name="order" value="1" />
    		<property name="viewClass"
    			value="org.springframework.web.servlet.view.JstlView" />
    		<property name="contentType" value="text/html" />
    		<property name="prefix" value="/WEB-INF/jsp/" />
    		<property name="suffix" value=".jsp" />
    	</bean>
    	
    	
    	<bean id="multipartResolver"
    		class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    		<property name="defaultEncoding" value="UTF-8" /> 
    		<property name="maxInMemorySize" value="10240" /> 
    		<property name="maxUploadSize" value="-1" /> 
    	</bean>
    </beans>

这样Spring 、SpringMVC和Mybaits就整合完毕了，但是还确实Mybait的主配置文件，sqlMapConfig.xml(名字也随便你起，但要跟Spring配置文件中写的一致)，事实上什么都没有，因为没用上它的功能，比如开启缓存啊、setting设置啊之类的，主要是省了我们写mapper映射文件加载，Spring已经自动帮我们完成了。

<?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="com.wrox.discussionboard.pojo"/>
    	</typeAliases> 
      </configuration>

配置文件就是这样的了，上面的所有东西就已经将Spring、SpringMVC、Mybaits整合完成了，接下是Discussion-Board功能的具体实现。

首先是POJO类，结构如下：

![70 1][]

只列出属性，注意一定要有get、set方法

public class Reply implements Serializable{
    
    	private static final long serialVersionUID = 1L;
    	private Integer id;
    	private Integer discussionId;
    	private String user;
    	private String message;
    	private LocalDateTime created;

public class Discussion implements Serializable {
    
    	private static final long serialVersionUID = 1L;
    	private Integer id;
    	private String user;
    	private String subject;
    	private String uriSafeSubject;
    	private String message;
    	private LocalDateTime created;
    	private LocalDateTime lastUpdated;
    	private Set<String> subscribedUsers = new HashSet<>();

public class DiscussionForm implements Serializable{
    
    	private static final long serialVersionUID = 1L;
    	private String user;
    	private String subject;
    	private String message;

public class ReplyForm implements Serializable{
    
    	private static final long serialVersionUID = 1L;
    	
    	private String user;
    	private String message;

接下来时mapper接口类，也就是在平常的Dao层：

public interface DiscussionMapper {
    
    	List<Discussion> getAll();
    	Discussion get(int id);
    	void add(Discussion discussion);
    	void update(Discussion discussion);
    }

public interface ReplyMapper {
    
    	List<Reply> getForDiscussion(int id);
    	void add(Reply reply);
    	void update(Reply reply);
    }

mapper映射文件代码如下：

ReplyMapper.xml

<?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.wrox.discussionboard.mapper.ReplyMapper">
    <select id="getForDiscussion" parameterType="int" resultType="com.wrox.discussionboard.pojo.Reply">
    	select * from reply where discussionId = #{discussionId}
    </select>
    <insert id="add" parameterType="com.wrox.discussionboard.pojo.Reply">
    	insert into reply(discussionId,user,message,created) 
    	values (#{discussionId},#{user},#{message},#{created})
    </insert>
    
    <update id="update" parameterType="com.wrox.discussionboard.pojo.Reply">
    	update reply set message = #{message}, created = #{created} where id = #{id}
    </update>
    
    </mapper>

DiscussionMapper.xml:

<?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.wrox.discussionboard.mapper.DiscussionMapper">
    
    <select id="getAll" resultType="com.wrox.discussionboard.pojo.Discussion">
    	select * from discussion
    </select>
    <select id="get" resultType="com.wrox.discussionboard.pojo.Discussion" parameterType="int">
    	select * from discussion where id = #{id}
    </select>
    <insert id="add" parameterType="com.wrox.discussionboard.pojo.Discussion">
    	insert into discussion(user,subject,uriSafeSubject,message,created,lastUpdated) 
    	values(#{user},#{subject},#{uriSafeSubject},#{message},#{created},#{lastUpdated}) 
    </insert>
    
    <update id="update" parameterType="com.wrox.discussionboard.pojo.Discussion">
    	update discussion set subject = #{subject} ,uriSafeSubject = #{uriSafeSubject} , lastUpdated= #{lastUpdated} where id = #{id}
    </update>
    
    </mapper>

然后是Service层，采用面向接口编程的方式，结构如下：

![70 2][]

接口文件如下：

public interface DiscussionService {
    
    	List<Discussion> getAllDiscussion();
    	Discussion getDiscussion(int id);
    	void saveDiscussion(Discussion discussion);
    }

public interface ReplyService {
    	
    	List<Reply> getRepliesForDiscussion(int discussionId);
    	void saveReply(Reply reply);
    }

接口实现类如下:

@Service
    public class DefaultDiscussionService implements DiscussionService{
    
    	@Autowired
    	DiscussionMapper discussionMapper;
    	
    	@Override
    	public List<Discussion> getAllDiscussion() {
    		List<Discussion> list = this.discussionMapper.getAll();
    		list.sort((d1,d2) -> d1.getLastUpdated().compareTo(d2.getLastUpdated()));
    		return list;
    	}
    
    	@Override
    	public Discussion getDiscussion(int id) {
    		// TODO Auto-generated method stub
    		return this.discussionMapper.get(id);
    	}
    
    	@Override
    	public void saveDiscussion(Discussion discussion) {
    		// TODO Auto-generated method stub
    		String subject = discussion.getSubject();
    		subject = Normalizer.normalize(subject.toLowerCase(), Normalizer.Form.NFD)
                    .replaceAll("\\p{InCombiningDiacriticalMarks}+", "")
                    .replaceAll("[^\\p{Alnum}]+", "-")
                    .replace("--", "-").replace("--", "-")
                    .replaceAll("[^a-z0-9]+$", "")
                    .replaceAll("^[^a-z0-9]+", "");
    		discussion.setUriSafeSubject(subject);
    		LocalDateTime now = LocalDateTime.now();
    		discussion.setLastUpdated(now);
    		
    		if(discussion.getId() ==  null){
    			discussion.setCreated(now);
    			discussion.getSubscribedUsers().add(discussion.getUser());
    			this.discussionMapper.add(discussion);
    		}else
    			this.discussionMapper.update(discussion);
    	}
    
    }

@Service
    public class DefaultReplyService implements ReplyService{
    
    	@Autowired
    	ReplyMapper replyMapper;
    	@Autowired
    	DiscussionService discussionService;
    	
    	@Override
    	public List<Reply> getRepliesForDiscussion(int discussionId) {
    		List<Reply> list = this.replyMapper.getForDiscussion(discussionId);
    		list.sort((r1,r2) -> r1.getId()<r2.getId() ? -1:1);
    		return list;
    	}
    
    	@Override
    	public void saveReply(Reply reply) {
    		// TODO Auto-generated method stub
    		Discussion discussion = this.discussionService.getDiscussion(reply.getDiscussionId());
    		if(reply.getId() == null){
    			discussion.getSubscribedUsers().add(reply.getUser());
    			reply.setCreated(LocalDateTime.now());
    			this.replyMapper.add(reply);
    		}
    		else{
    			this.replyMapper.update(reply);
    		}
    		this.discussionService.saveDiscussion(discussion);
    	}
    
    }

最后是逻辑控制层，其实现如下：

@Controller
    @RequestMapping("discussion")
    public class BoradController {
    
    	@Autowired
    	DiscussionService discussionService;
    	
    	@RequestMapping(value={"","list"},method = {RequestMethod.GET,RequestMethod.POST})
    	public String listDiscussions(Map<String,Object> model,HttpServletRequest request){
    		model.put("discussions",this.discussionService.getAllDiscussion());
    		return "discussion/list";
    	}
    	@RequestMapping(value="create",method = RequestMethod.GET)
    	public String createDiscussion(Map<String,Object> model,HttpServletRequest request){
    		model.put("discussionForm", new DiscussionForm());
    		return "discussion/create";
    	}
    	@RequestMapping(value="create",method = RequestMethod.POST)
    	public String createDiscussion(DiscussionForm from){
    		Discussion discussion = new Discussion();
    		discussion.setUser(from.getUser());
    		discussion.setSubject(from.getSubject());;
    		discussion.setMessage(from.getMessage());
    		this.discussionService.saveDiscussion(discussion);
    		
    		return "forward:/discussion/list";
    	}
    }

@Controller
    @RequestMapping("discussion/{discussionId:\\d+}")
    public class DiscussionController {
    
    	@Autowired
    	DiscussionService discussionService;
    	@Autowired
    	ReplyService replyService;
    	
    	@RequestMapping(value ={"","*"},method = RequestMethod.GET)
    	public String viewDiscussion(Map<String,Object> model,@PathVariable("discussionId") int id){
    		Discussion discussion = this.discussionService.getDiscussion(id);
    		if(discussion != null){
    			model.put("discussion", discussion);
    			model.put("replies", this.replyService.getRepliesForDiscussion(id));
    			model.put("replyForm", new ReplyForm());
    			return "discussion/view";
    		}
    		return "discussion/errorNoDiscussion";
    	}
    	@RequestMapping(value="reply",method=RequestMethod.POST)
    	public ModelAndView reply(ReplyForm form,@PathVariable("discussionId") int id){
    		Discussion discussion = this.discussionService.getDiscussion(id);
    		if(discussion != null){
    			Reply reply = new Reply();
    			reply.setDiscussionId(id);
    			reply.setUser(form.getUser());
    			reply.setMessage(form.getMessage());
    			this.replyService.saveReply(reply);
    			
    			return new ModelAndView(new RedirectView("/discussion/"+id+"/"+discussion.getUriSafeSubject(),true,false));
    		}
    		return new ModelAndView("discussion/errorNoDiscussion");
    	}
    	
    }

最后是视图层，其结构如果：

![70 3][]

create.jsp文件代码如下：

<%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Insert title here</title>
    </head>
    <body>
    	<h2>Create Discussion</h2>
    	<a href="list">返回列表界面</a>
    	<br>
    	<form:form method="post" modelAttribute="discussionForm">
    		<form:label path="user">邮箱：</form:label><br>
    		<form:input path="user" type="email"/><br>
    		<br>
    		<form:label path="subject">Subject</form:label><br>
    		<form:input path="subject" /><br>
    		<br>
    		<form:label path="message">Message</form:label><br />
            <form:textarea path="message" cols="40" rows="5" /><br />
            <br />
            <input type="submit" value="Submit" />
    		
    	</form:form>
    </body>
    </html>

errorNoDiscussion.jsp：

<%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Insert title here</title>
    </head>
    <body>
            <h2>Error: Discussion Not Found</h2>
          	  你输入的讨论不存在！<br />
            <br />
            [<a href="<c:url value="discussion/list" />">返回列表</a>]
    </body>
    </html>

list.jsp:

<%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
        <%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
        <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
        <%--@elvariable id="discussions" type="java.util.List<com.wrox.discussionboard.pojo.Discussion>"--%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Insert title here</title>
    </head>
    <body>
            <h2>Discussions</h2>
            [<a href="<c:url value="/discussion/create" />">new discussion</a>]<br />
            <br />
            <c:choose>
                <c:when test="${fn:length(discussions) > 0}">
                    <c:forEach items="${discussions}" var="discussion">
                        <a href="<c:url value="/discussion/${discussion.id}/${discussion.uriSafeSubject}" />">
                            <c:out value="${discussion.subject}" /></a><br />
                        (<c:out value="${discussion.user}" />)<br/>
                    </c:forEach>
                </c:when>
                <c:otherwise>
                    <i>There are no discussions yet.</i>
                </c:otherwise>
            </c:choose>
    </body>
    </html>

view.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
    <%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
    <%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
    <%--@elvariable id="discussion" type="com.wrox.discussionboard.pojo.Discussion"--%>
    <%--@elvariable id="replies" type="java.util.List<com.wrox.discussionboard.pojo.Reply>"--%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Insert title here</title>
    </head>
    <body>
            <h2>Discussion: <c:out value="${discussion.subject}" /></h2>
            [<a href="<c:url value="/discussion/list" />">return to list</a>]<br />
            <i>User: <c:out value="${discussion.user}" /> / Created: <c:out value="${discussion.created}" /></i>
            <br />
            <c:out value="${discussion.message}" /><br />
            <br />
            <c:choose>
                <c:when test="${fn:length(replies) > 0}">
                    <c:forEach items="${replies}" var="reply" varStatus="i">
                        <b>Reply #${i.count}</b><i> - <c:out value="${reply.user}" /> -
                        <c:out value="${reply.created}" /></i><br />
                        <c:out value="${reply.message}" /><br />
                        <br />
                    </c:forEach>
                </c:when>
                <c:otherwise>
                    <i>There are no replies yet.</i><br />
                    <br />
                </c:otherwise>
            </c:choose>
            <b>Post Reply</b><br />
            <br />
            <c:set var="action"><c:url value="/discussion/${discussion.id}/reply" /></c:set>
            <form:form method="post" action="${action}" modelAttribute="replyForm">
                <form:label path="user">Your Email</form:label><br />
                <form:input path="user" type="email" /><br />
                <br />
                <form:label path="message">Message</form:label><br />
                <form:textarea path="message" cols="40" rows="5" /><br />
                <br />
                <input type="submit" value="Submit" />
            </form:form>
    </body>
    </html>

启动Tomcat,在浏览器地址中输入：http://localhost/Discussion-Board/discussion/list因有如下显示：

![70 4][]

我是因为数据库中已经存有了信息才会有这些显示，如果数据库为空，应显示There are no discussions yet.

这篇博文提醒了我要搞个github账户来玩一玩，否则的话非重点的代码实在是太多了！！

[70]: /images/20220525/43cd4c070f554e4397c27977ced62343.png
[70 1]: /images/20220525/72ba2e01ad634de0b482feddef4760af.png
[70 2]: /images/20220525/b926189bcadb4b80b045b605bcc2edfa.png
[70 3]: /images/20220525/bbec279862b44b3ba75dbb903f335875.png
[70 4]: /images/20220525/315a535df564406db74b404133fdd657.png