jpa+springmvc+springdata(一)

学习尚硅谷笔记：

首先配置application.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"
     xmlns:jpa="http://www.springframework.org/schema/data/jpa"
     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
         http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd
         http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">

     <!-- 配置自动扫描的包 -->
     <context:component-scan base-package="com.atguigu.sssp">
         <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
         <context:exclude-filter type="annotation" expression="org.springframework.web.bind.annotation.ControllerAdvice"/>
     </context:component-scan>

     <!-- 配置数据源 -->
     <context:property-placeholder location="classpath:db.properties"/>

     <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="driverClass" value="${jdbc.driverClass}"></property>
         <property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property>    

         <!-- 配置其他属性 -->
     </bean>

     <!-- 配置 JPA 的 EntityManagerFactory -->
     <bean id="entityManagerFactory"
         class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
         <property name="dataSource" ref="dataSource"></property>
         <property name="jpaVendorAdapter">
             <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"></bean>
         </property>
         <property name="packagesToScan" value="com.atguigu.sssp"></property>
         <property name="jpaProperties">
             <props>
                 <prop key="hibernate.ejb.naming_strategy">org.hibernate.cfg.ImprovedNamingStrategy</prop>
                 <prop key="hibernate.hbm2ddl.auto">update</prop>
                 <prop key="hibernate.show_sql">true</prop>
                 <prop key="hibernate.format_sql">true</prop>
                 <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</prop>

                 <prop key="hibernate.cache.use_second_level_cache">true</prop>
                 <prop key="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.EhCacheRegionFactory</prop>
                 <prop key="hibernate.cache.use_query_cache">true</prop>
             </props>
         </property>
         <property name="sharedCacheMode" value="ENABLE_SELECTIVE"></property>
     </bean>

     <!-- 配置事务 -->
     <bean id="transactionManager"
         class="org.springframework.orm.jpa.JpaTransactionManager">
         <property name="entityManagerFactory" ref="entityManagerFactory"></property>
     </bean>

     <!-- 配置支持基于注解的事务 -->
     <tx:annotation-driven transaction-manager="transactionManager"/>

     <!-- 配置 SpringData -->
     <jpa:repositories base-package="com.atguigu.sssp"
         entity-manager-factory-ref="entityManagerFactory"></jpa:repositories>

 </beans>

其中：db.properties

jdbc.user=root
jdbc.password=1111
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.jdbcUrl=jdbc:mysql://localhost:3306/springdata

还有二级缓存的配置：ehcache.xml

 <ehcache>

     <!-- Sets the path to the directory where cache .data files are created.

          If the path is a Java System Property it is replaced by
          its value in the running VM.

          The following properties are translated:
          user.home - User's home directory
          user.dir - User's current working directory
          java.io.tmpdir - Default temp file path -->
     <diskStore path="java.io.tmpdir"/>

     <!--Default Cache configuration. These will applied to caches programmatically created through
         the CacheManager.

         The following attributes are required for defaultCache:

         maxInMemory       - Sets the maximum number of objects that will be created in memory
         eternal           - Sets whether elements are eternal. If eternal,  timeouts are ignored and the element
                             is never expired.
         timeToIdleSeconds - Sets the time to idle for an element before it expires. Is only used
                             if the element is not eternal. Idle time is now - last accessed time
         timeToLiveSeconds - Sets the time to live for an element before it expires. Is only used
                             if the element is not eternal. TTL is now - creation time
         overflowToDisk    - Sets whether elements can overflow to disk when the in-memory cache
                             has reached the maxInMemory limit.

         -->
     <defaultCache
         maxElementsInMemory="10000"
         eternal="false"
         timeToIdleSeconds="120"
         timeToLiveSeconds="120"
         overflowToDisk="true"
         />

     <!--Predefined caches.  Add your cache configuration settings here.
         If you do not have a configuration for your cache a WARNING will be issued when the
         CacheManager starts

         The following attributes are required for defaultCache:

         name              - Sets the name of the cache. This is used to identify the cache. It must be unique.
         maxInMemory       - Sets the maximum number of objects that will be created in memory
         eternal           - Sets whether elements are eternal. If eternal,  timeouts are ignored and the element
                             is never expired.
         timeToIdleSeconds - Sets the time to idle for an element before it expires. Is only used
                             if the element is not eternal. Idle time is now - last accessed time
         timeToLiveSeconds - Sets the time to live for an element before it expires. Is only used
                             if the element is not eternal. TTL is now - creation time
         overflowToDisk    - Sets whether elements can overflow to disk when the in-memory cache
                             has reached the maxInMemory limit.

         -->

     <!-- Sample cache named sampleCache1
         This cache contains a maximum in memory of 10000 elements, and will expire
         an element if it is idle for more than 5 minutes and lives for more than
         10 minutes.

         If there are more than 10000 elements it will overflow to the
         disk cache, which in this configuration will go to wherever java.io.tmp is
         defined on your system. On a standard Linux system this will be /tmp"
         -->
     <cache name="sampleCache1"
         maxElementsInMemory="10000"
         eternal="false"
         timeToIdleSeconds="300"
         timeToLiveSeconds="600"
         overflowToDisk="true"
         />

     <!-- Sample cache named sampleCache2
         This cache contains 1000 elements. Elements will always be held in memory.
         They are not expired. -->
     <cache name="sampleCache2"
         maxElementsInMemory="1000"
         eternal="true"
         timeToIdleSeconds="0"
         timeToLiveSeconds="0"
         overflowToDisk="false"
         /> -->

     <!-- Place configuration for your caches following -->

 </ehcache>

springmvc的配置：springDispatcherServlet-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/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">

     <!-- 配置自动扫描的包 -->
     <context:component-scan base-package="com.atguigu.sssp" 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>

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

     <mvc:default-servlet-handler/>
     <mvc:annotation-driven></mvc:annotation-driven>

 </beans>

web.xml:

 <?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" id="WebApp_ID" version="2.5">

     <!-- 配置启动 IOC 容器的 Listener -->
     <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>

     <!-- 配置字符编码过滤器 -->
     <!-- 字符编码过滤器必须配置在所有过滤器的最前面! -->
     <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>
     </filter>

     <filter-mapping>
         <filter-name>CharacterEncodingFilter</filter-name>
         <url-pattern>/*</url-pattern>
     </filter-mapping>

     <!-- 配置可以把 POST 请求转为 PUT、DELETE 请求的 Filter -->
     <filter>
         <filter-name>HiddenHttpMethodFilter</filter-name>
         <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
     </filter>

     <filter-mapping>
         <filter-name>HiddenHttpMethodFilter</filter-name>
         <url-pattern>/*</url-pattern>
     </filter-mapping>

     <!-- 配置 OpenEntityManagerInViewFilter. 可以解决懒加载异常的问题 -->
     <filter>
         <filter-name>OpenEntityManagerInViewFilter</filter-name>
         <filter-class>org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter</filter-class>
     </filter>

     <filter-mapping>
         <filter-name>OpenEntityManagerInViewFilter</filter-name>
         <url-pattern>/*</url-pattern>
     </filter-mapping>

     <!-- 配置 SpringMVC 的 DispatcherServlet -->
     <servlet>
         <servlet-name>springDispatcherServlet</servlet-name>
         <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
         <load-on-startup>1</load-on-startup>
     </servlet>

     <servlet-mapping>
         <servlet-name>springDispatcherServlet</servlet-name>
         <url-pattern>/</url-pattern>
     </servlet-mapping>

 </web-app>