缓存初解（五）---SpringMVC基于注解的缓存配置--web应用实例

之前为大家介绍了如何使用spring注解来进行缓存配置 （EHCache 和 OSCache）的简单的例子，详见

Spring基于注解的缓存配置--EHCache AND OSCache

现在介绍一下如何在基于注解springMVC的web应用中使用注解缓存，其实很简单，就是将springMVC配置文件与缓存注解文件一起声明到context中就OK了。

下面我就来构建一个基于spring注解小型的web应用,这里我使用EHCache来作为缓存方案

jar依赖：

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

接着我们来编写web.xml

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<?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加载log4j -->
    <context-param>
        <param-name>log4jConfigLocation</param-name>
        <param-value>classpath:log4j.properties</param-value>
    </context-param>
     
    <!-- 声明spring配置文件 -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>
            /WEB-INF/spring-servlet.xml
        </param-value>
    </context-param>
     
    <!-- 使用UTF-8编码 -->
    <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>
 
    <!-- 负责初始化log4j-->
    <listener>
        <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
    </listener>
     
    <!-- 负责初始化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>

 接着我们来编写spring-servlet.xml

 

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<?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">
 
 
    <!--启用注解   定义组件查找规则 -->
    <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>
 
    <!-- 视图查找器 -->
    <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>
     
    <!-- 加载ehcache缓存配置文件
 
    说明：在这里我遇到了这样一个问题，当使用@Service等注解的方式将类声明到配置文件中时，
    就需要将缓存配置import到主配置文件中，否则缓存会不起作用
    如果是通过<bean>声明到配置文件中时，
    则只需要在web.xml的contextConfigLocation中加入applicationContext-ehcache.xml即可，
    不过还是推荐使用如下方式吧，因为这样不会有任何问题
    -->
    <import resource="classpath:applicationContext-ehcache.xml"/>
</beans>

 

ok，我们接着编写applicationContext-ehcache.xml，还记得之前介绍的基于命名空间的配置吗，如下：

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<?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

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<?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，配置文件都完成了，接着我们来编写controller、service和dao

1.CacheDemoController：

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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 ：

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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");
    }
 
}

 

我们只对service层加入了注解缓存配置。

 

接着我们来写一个简单的页面，cacheDemo.jsp：

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<%@ 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，一切就绪，我们启动服务器，并访问http://localhost:8080/cache/demo.do

 

多请求几次，请求两次的输出结果：

Processing testCaching
NameId:0
NameId:0

 

说明缓存起作用了，ok！

 

接着我们刷新该缓存，访问http://localhost:8080/cache/demoFulsh.do

再请求http://localhost:8080/cache/demo.do

输出结果：

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

 

缓存刷新成功。

posted @   吴小雨  阅读(573)  评论(0)  编辑  收藏  举报
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