SSM随笔

Posted 2022-09-17 dch0

1.SSM框架的简单配置

1.1 引入jar

c3p0-0.9.1.2.jar    #连接池
com.springsource.org.aopalliance-1.0.0.jar
com.springsource.org.aspectj.weaver-1.6.8.RELEASE.jar
commons-logging-1.1.3.jar
jackson-annotations-2.9.8.jar   #json支持
jackson-core-2.9.8.jar          #json支持
jackson-databind-2.9.8.jar      #json支持
mybatis-3.4.1.jar
mybatis-spring-1.3.0.jar
mysql-connector-java-5.1.7-bin.jar  #mysql驱动
spring-aop-4.0.0.RELEASE.jar
spring-aspects-4.0.0.RELEASE.jar
spring-beans-4.0.0.RELEASE.jar
spring-context-4.0.0.RELEASE.jar
spring-core-4.0.0.RELEASE.jar
spring-expression-4.0.0.RELEASE.jar
spring-jdbc-4.0.0.RELEASE.jar
spring-orm-4.0.0.RELEASE.jar
spring-tx-4.0.0.RELEASE.jar
spring-web-4.0.0.RELEASE.jar
spring-webmvc-4.0.0.RELEASE.jar

1.2 web.xml配置文件

1.2.1在工程的classpath下创建两个配置文件

#在src目录下创建
applicationContext.xml
springMvc.xml

1.2.2web.xml的配置

<!-- 配置spring -->
<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>

<!--POST过滤器 -->
<filter>
    <filter-name>encoding</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>encoding</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

<!-- springMVC -->
<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>

• 注意：/ 和 /*的区别

其中/和/*的区别：
< url-pattern > / </ url-pattern >   会匹配到/login这样的路径型url,不会匹配到*.jsp，即：*.jsp不会进入spring的 DispatcherServlet类 。
< url-pattern > /* </ url-pattern > 会匹配*.jsp，会出现返回jsp视图时再次进入spring的DispatcherServlet 类，导致找不到对应的controller所以报404错。

1.3 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"
    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/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd">

    <!-- 自动扫描包,排除springmvc中的Controller -->
    <context:component-scan base-package="com.pdsu">
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>
    
    <!-- property引入文件 -->
    <context:property-placeholder location="classpath:jdbc.properties"/>
    
    <!-- c3p0连接池 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" >
        <property name="user" value="$jdbc.user"></property>
        <property name="password" value="$jdbc.password"></property>
        <property name="jdbcUrl" value="$jdbc.jdbcUrl"></property>
        <property name="driverClass" value="$jdbc.driverClass"></property>
    </bean>
    
    <!-- 配置数据源事务管理器 -->
     <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
     </bean>
     
     <!-- 开启基于注解的事物 -->
     <tx:annotation-driven transaction-manager="transactionManager"/>
    
    <!-- 配置mybatis -->
    <bean class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
        <property name="configLocation" value="classpath:mybatis.xml"/>
    </bean> 
     
     <!-- 配置扫描Mapper包 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.pdsu.dao" />
    </bean>
    
</beans>

1.4 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/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.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-4.0.xsd">

    <!-- 自动扫描包,只扫描Controller -->
    <context:component-scan base-package="com.pdsu" use-default-filters="false">
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

    <!-- 视图解析器 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="suffix" value=".jsp"></property>
        <property name="prefix" value="/WEB-INF/views/"></property>
    </bean>
    
    <!-- json转换器 -->
    <bean id="jsonMessageConverter"
        class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
    </bean>
    
    <!-- 拦截静态资源 -->
    <mvc:default-servlet-handler/>
    
    <!-- 注解驱动 -->
    <mvc:annotation-driven/>
    
</beans>

1.5 mybatis.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>
    <settings>
        <!-- 开启mybatis的懒加载机制 -->
        <setting name="lazyLoadingEnabled" value="true"/>
        <setting name="aggressiveLazyLoading" value="false"/>
        
        <!-- 转驼峰命名 -->
        
        <!-- 打印sql -->
        <setting name="logImpl" value="STDOUT_LOGGING" />
    </settings>
</configuration>

1.6 jdbc.properties

jdbc.jdbcUrl=jdbc:mysql://localhost:3306/spring4
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.user=root
jdbc.password=root

2. Mybatis相关配置