Spring基於註解的緩衝配置--web應用執行個體__spring

之前為大家介紹了如何使用spring註解來進行緩衝配置 （EHCache 和 OSCache）的簡單的例子，詳見

Spring基於註解的緩衝配置--EHCache AND OSCache

 

現在介紹一下如何在基於註解springMVC的web應用中使用註解緩衝，其實很簡單，就是將springMVC設定檔與緩衝註解檔案一起聲明到context中就OK了。

 

下面我就來構建一個基於spring註解小型的web應用,這裡我使用EHCache來作為緩衝方案。

 

首先來看一下目錄結構，如下：

 

jar依賴：

ehcache-core-1.7.2.jar
jakarta-oro-2.0.8.jar
slf4j-api-1.5.8.jar
slf4j-jdk14-1.5.8.jar 
cglib-nodep-2.1_3.jar
commons-logging.jar
log4j-1.2.15.jar
spring-modules-cache.jar
spring.jar 
jstl.jar

standard.jar 

 

接著我們來編寫web.xml

<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" id="WebApp_ID" version="2.4" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <display-name>SpringCacheWeb</display-name> <!-- 由spring載入log4j --> <context-param> <param-name>log4jConfigLocation</param-name> <param-value>classpath:log4j.properties</param-value> </context-param> <!-- 聲明spring設定檔 --> <context-param> <param-name>contextConfigLocation</param-name> <param-value> /WEB-INF/spring-servlet.xml </param-value> </context-param> <!-- 使用UTF-8編碼 --> <filter> <filter-name>Set Character 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>Set Character Encoding</filter-name> <url-pattern>*.do</url-pattern> </filter-mapping> <!-- 負責初始化log4j--> <listener> <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class> </listener> <!-- 負責初始化spring上下文--> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <!-- springMVC控制器--> <servlet> <servlet-name>spring</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>spring</servlet-name> <url-pattern>*.do</url-pattern> </servlet-mapping> <session-config> <session-timeout>10</session-timeout> </session-config> <welcome-file-list> <welcome-file>index.jsp</welcome-file> <welcome-file>index.html</welcome-file> <welcome-file>index.htm</welcome-file> </welcome-file-list> </web-app>

 

接著我們來編寫spring-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:ehcache="http://www.springmodules.org/schema/ehcache" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd http://www.springmodules.org/schema/ehcache http://www.springmodules.org/schema/cache/springmodules-ehcache.xsd" default-lazy-init="true"> <!--啟用註解 定義組件尋找規則 --> <context:component-scan base-package="com.netqin"> <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller" /> <context:include-filter type="annotation" expression="org.springframework.stereotype.Service" /> <context:include-filter type="annotation" expression="org.springframework.stereotype.Repository" /> </context:component-scan> <!-- 視圖尋找器 --> <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"> </property> <property name="prefix" value="/WEB-INF/jsp/"></property> <property name="suffix" value=".jsp"></property> </bean> <!-- 載入ehcache緩衝設定檔 說明：在這裡我遇到了這樣一個問題，當使用@Service等註解的方式將類聲明到設定檔中時， 就需要將緩衝配置import到主設定檔中，否則緩衝會不起作用 如果是通過<bean>聲明到設定檔中時， 則只需要在web.xml的contextConfigLocation中加入applicationContext-ehcache.xml即可， 不過還是推薦使用如下方式吧，因為這樣不會有任何問題 --> <import resource="classpath:applicationContext-ehcache.xml"/> </beans>

 

ok，我們接著編寫applicationContext-ehcache.xml，還記得之前介紹的基於命名空間的配置嗎，如下：

<?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:ehcache="http://www.springmodules.org/schema/ehcache" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springmodules.org/schema/ehcache http://www.springmodules.org/schema/cache/springmodules-ehcache.xsd"> <ehcache:config configLocation="classpath:ehcache.xml" id="cacheProvider" /> <ehcache:annotations providerId="cacheProvider"> <ehcache:caching cacheName="testCache" id="testCaching" /> <ehcache:flushing cacheNames="testCache" id="testFlushing" /> </ehcache:annotations> </beans>

 

ehcache.xml如下：

<?xml version="1.0" encoding="UTF-8"?> <ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="ehcache.xsd" updateCheck="true" monitoring="autodetect"> <diskStore path="java.io.tmpdir"/> <defaultCache maxElementsInMemory="10000" eternal="false" timeToIdleSeconds="120" timeToLiveSeconds="120" overflowToDisk="true" maxElementsOnDisk="10000000" diskPersistent="false" diskExpiryThreadIntervalSeconds="120" memoryStoreEvictionPolicy="LRU" /> <cache name="testCache" maxElementsInMemory="10000" maxElementsOnDisk="1000" eternal="false" overflowToDisk="true" diskSpoolBufferSizeMB="20" timeToIdleSeconds="300" timeToLiveSeconds="600" memoryStoreEvictionPolicy="LFU" /> </ehcache>

 

ok，設定檔都完成了，接著我們來編寫controller、service和dao

1.CacheDemoController：

package com.netqin.function.cacheDemo; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.RequestMapping; @Controller public class CacheDemoController { @Autowired private CacheDemoService service; @RequestMapping("/demo.do") public String handleIndex(Model model) { System.out.println(service.getName(0)); model.addAttribute("name", service.getName(0)); return "cacheDemo"; } @RequestMapping("/demoFulsh.do") public String handleFulsh(Model model) { service.flush(); return "cacheDemo"; } }

2.CacheDemoService ：

package com.netqin.function.cacheDemo; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import org.springmodules.cache.annotations.CacheFlush; import org.springmodules.cache.annotations.Cacheable; @Service public class CacheDemoService { @Autowired private CacheDemoDao dao; @Cacheable(modelId = "testCaching") public String getName(int id){ System.out.println("Processing testCaching"); return dao.getName(id); } @CacheFlush(modelId = "testFlushing") public void flush(){ System.out.println("Processing testFlushing"); } }

我們只對service層加入了註解緩衝配置。

 

接著我們來寫一個簡單的頁面，cacheDemo.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> CacheDemo:${name} </body> </html>

 

ok，一切就緒，我們啟動伺服器，並訪問http://localhost:8080/cache/demo.do

 

多請求幾次，請求兩次的輸出結果：

Processing testCaching
NameId:0
NameId:0

 

說明緩衝起作用了，ok。

 

接著我們重新整理該緩衝，訪問http://localhost:8080/cache/demoFulsh.do

再請求http://localhost:8080/cache/demo.do

輸出結果：

Processing testCaching
NameId:0
NameId:0
Processing testFlushing
Processing testCaching
NameId:0

 

緩衝重新整理成功。  SpringCacheWeb.rar (4.2 MB)