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。
首先来看一下目录结构,如下:
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
1. <?xml version="1.0" encoding="UTF-8"?>
2. <web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
3. id="WebApp_ID" version="2.4"
4. xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
5. <display-name>SpringCacheWeb</display-name>
6.
7. <!-- 由spring加载log4j -->
8. <context-param>
9. <param-name>log4jConfigLocation</param-name>
10. <param-value>classpath:log4j.properties</param-value>
11. </context-param>
12.
13. <!-- 声明spring配置文件 -->
14. <context-param>
15. <param-name>contextConfigLocation</param-name>
16. <param-value>
17. /WEB-INF/spring-servlet.xml
18. </param-value>
19. </context-param>
20.
21. <!-- 使用UTF-8编码 -->
22. <filter>
23. <filter-name>Set Character Encoding</filter-name>
24. <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
25. <init-param>
26. <param-name>encoding</param-name>
27. <param-value>UTF-8</param-value>
28. </init-param>
29. </filter>
30. <filter-mapping>
31. <filter-name>Set Character Encoding</filter-name>
32. <url-pattern>*.do</url-pattern>
33. </filter-mapping>
34.
35. <!-- 负责初始化log4j-->
36. <listener>
37. <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
38. </listener>
39.
40. <!-- 负责初始化spring上下文-->
41. <listener>
42. <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
43. </listener>
44.
45. <!-- springMVC控制器-->
46. <servlet>
47. <servlet-name>spring</servlet-name>
48. <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
49. <load-on-startup>1</load-on-startup>
50. </servlet>
51.
52. <servlet-mapping>
53. <servlet-name>spring</servlet-name>
54. <url-pattern>*.do</url-pattern>
55. </servlet-mapping>
56.
57. <session-config>
58. <session-timeout>10</session-timeout>
59. </session-config>
60.
61. <welcome-file-list>
62. <welcome-file>index.jsp</welcome-file>
63. <welcome-file>index.html</welcome-file>
64. <welcome-file>index.htm</welcome-file>
65. </welcome-file-list>
66. </web-app>
接着我们来编写spring-servlet.xml
1. <?xml version="1.0" encoding="UTF-8"?>
2. <beans xmlns="http://www.springframework.org/schema/beans"
3. xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
4. xmlns:context="http://www.springframework.org/schema/context"
5. xmlns:ehcache="http://www.springmodules.org/schema/ehcache"
6. xsi:schemaLocation="
7. http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
8. http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd
9. http://www.springmodules.org/schema/ehcache http://www.springmodules.org/schema/cache/springmodules-ehcache.xsd"
10. default-lazy-init="true">
11.
12.
13. <!--启用注解 定义组件查找规则 -->
14. <context:component-scan base-package="com.netqin">
15. <context:include-filter type="annotation"
16. expression="org.springframework.stereotype.Controller" />
17. <context:include-filter type="annotation"
18. expression="org.springframework.stereotype.Service" />
19. <context:include-filter type="annotation"
20. expression="org.springframework.stereotype.Repository" />
21. </context:component-scan>
22.
23. <!-- 视图查找器 -->
24. <bean id="viewResolver"
25. class="org.springframework.web.servlet.view.InternalResourceViewResolver">
26. <property name="viewClass"
27. value="org.springframework.web.servlet.view.JstlView">
28. </property>
29. <property name="prefix" value="/WEB-INF/jsp/"></property>
30. <property name="suffix" value=".jsp"></property>
31. </bean>
32.
33. <!-- 加载ehcache缓存配置文件
34.
35. 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,
36. 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
37. <bean>声明到配置文件中时,
38. 则只需要在web.xml的contextConfigLocation中加入applicationContext-ehcache.xml即可,
39. 不过还是推荐使用如下方式吧,因为这样不会有任何问题
40. >
41. <import resource="classpath:applicationContext-ehcache.xml"/>
42. </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:
1. <?xml version="1.0" encoding="UTF-8"?>
2. <beans xmlns="http://www.springframework.org/schema/beans"
3. xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ehcache="http://www.springmodules.org/schema/ehcache"
4. xsi:schemaLocation="
5. http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
6. >
7.
8.
9. <ehcache:config configLocation="classpath:ehcache.xml"
10. id="cacheProvider" />
11. <ehcache:annotations providerId="cacheProvider">
12. <ehcache:caching cacheName="testCache" id="testCaching" />
13. <ehcache:flushing cacheNames="testCache" id="testFlushing" />
14. </ehcache:annotations>
15.
16. </beans>
ehcache.xml如下:
1. <?xml versinotallow="1.0" encoding="UTF-8"?>
2. <ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
3. xsi:noNamespaceSchemaLocatinotallow="ehcache.xsd" updateCheck="true"
4. mnotallow="autodetect">
5. <diskStore path="java.io.tmpdir"/>
6. <defaultCache
7. maxElementsInMemory="10000"
8. eternal="false"
9. timeToIdleSecnotallow="120"
10. timeToLiveSecnotallow="120"
11. overflowToDisk="true"
12. maxElementsOnDisk="10000000"
13. diskPersistent="false"
14. diskExpiryThreadIntervalSecnotallow="120"
15. memoryStoreEvictinotallow="LRU"
16. />
17. <cache name="testCache"
18. maxElementsInMemory="10000"
19. maxElementsOnDisk="1000"
20. eternal="false"
21. overflowToDisk="true"
22. diskSpoolBufferSizeMB="20"
23. timeToIdleSecnotallow="300"
24. timeToLiveSecnotallow="600"
25. memoryStoreEvictinotallow="LFU"
26. />
27. </ehcache>
ok,配置文件都完成了,接着我们来编写controller、service和dao
1.CacheDemoController:
1. package
2.
3. import
4. import
5. import
6. import
7.
8. @Controller
9. public class
10. @Autowired
11. private
12.
13. @RequestMapping("/demo.do")
14. public
15.
16. 0));
17. "name", service.getName(0));
18.
19. return "cacheDemo";
20. }
21. @RequestMapping("/demoFulsh.do")
22. public
23. service.flush();
24. return "cacheDemo";
25. }
26. }
2.CacheDemoService :
1. package
2.
3. import
4. import
5. import
6. import
7.
8. @Service
9. public class
10. @Autowired
11. private
12.
13. @Cacheable(modelId = "testCaching")
14. public String getName(int
15. "Processing testCaching");
16. return
17. }
18.
19. @CacheFlush(modelId = "testFlushing")
20. public void
21. "Processing testFlushing");
22. }
23.
24. }
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:
1. <%@ page language="java" cnotallow="text/html; charset=UTF-8"
2. pageEncoding="UTF-8"%>
3. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
4. <html>
5. <head>
6. <meta http-equiv="Content-Type" cnotallow="text/html; charset=UTF-8">
7. <title>Insert title here</title>
8. </head>
9. <body>
10. CacheDemo:${name}
11. </body>
12. </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。