Spring基於註解的緩存配置--web應用實例

時間  2019-11-06
標籤 spring 基於 註解 緩存 配置 web 應用 實例 欄目 Spring 简体版
原文   原文鏈接

以前爲你們介紹瞭如何使用spring註解來進行緩存配置 （EHCache 和 OSCache）的簡單的例子，詳見html

Spring基於註解的緩存配置--EHCache AND OSCachejava

如今介紹一下如何在基於註解springMVC的web應用中使用註解緩存，其實很簡單，就是將springMVC配置文件與緩存註解文件一塊兒聲明到context中就OK了。node

下面我就來構建一個基於spring註解小型的web應用,這裏我使用EHCache來做爲緩存方案。web

首先來看一下目錄結構，以下：spring

jar依賴：express

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.jarapi

standard.jar 緩存

接着咱們來編寫web.xml服務器

Xml代碼 複製代碼 收藏代碼
  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>
  7. <!-- 由spring加載log4j -->
  8. <context-param>
  9. <param-name>log4jConfigLocation</param-name>
  10. <param-value>classpath:log4j.properties</param-value>
  11. </context-param>
  13. <!-- 聲明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>
  21. <!-- 使用UTF-8編碼 -->
  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>
  35. <!-- 負責初始化log4j-->
  36. <listener>
  37. <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
  38. </listener>
  40. <!-- 負責初始化spring上下文-->
  41. <listener>
  42. <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  43. </listener>
  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>
  52. <servlet-mapping>
  53. <servlet-name>spring</servlet-name>
  54. <url-pattern>*.do</url-pattern>
  55. </servlet-mapping>
  57. <session-config>
  58. <session-timeout>10</session-timeout>
  59. </session-config>
  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> 
<?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加載log4j -->
	<context-param>
		<param-name>log4jConfigLocation</param-name>
		<param-value>classpath:log4j.properties</param-value>
	</context-param>
	
	<!-- 聲明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>

接着咱們來編寫spring-servlet.xmlsession

Xml代碼 複製代碼 收藏代碼
  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">
  13. <!--啓用註解 定義組件查找規則 -->
  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>
  23. <!-- 視圖查找器 -->
  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>
  33. <!-- 加載ehcache緩存配置文件
  35. 說明：在這裏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配置文件中時，
  36. 就須要將緩存配置import到主配置文件中，不然緩存會不起做用
  37. 若是是經過<bean>聲明到配置文件中時，
  38. 則只須要在web.xml的contextConfigLocation中加入applicationContext-ehcache.xml便可，
  39. 不過仍是推薦使用以下方式吧，由於這樣不會有任何問題
  40. -->
  41. <import resource="classpath:applicationContext-ehcache.xml"/>
  42. </beans> 
<?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">


	<!--啓用註解   定義組件查找規則 -->
	<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>
	
	<!-- 加載ehcache緩存配置文件 

	說明：在這裏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配置文件中時，
	就須要將緩存配置import到主配置文件中，不然緩存會不起做用
	若是是經過<bean>聲明到配置文件中時，
	則只須要在web.xml的contextConfigLocation中加入applicationContext-ehcache.xml便可，
	不過仍是推薦使用以下方式吧，由於這樣不會有任何問題
	-->
	<import resource="classpath:applicationContext-ehcache.xml"/>
</beans>

ok，咱們接着編寫applicationContext-ehcache.xml，還記得以前介紹的基於命名空間的配置嗎，以下：

Xml代碼 複製代碼 收藏代碼
  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. http://www.springmodules.org/schema/ehcache http://www.springmodules.org/schema/cache/springmodules-ehcache.xsd">
  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>
  16. </beans> 
<?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以下：

Xml代碼 複製代碼 收藏代碼
  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  3. xsi:noNamespaceSchemaLocation="ehcache.xsd" updateCheck="true"
  4. monitoring="autodetect">
  5. <diskStore path="java.io.tmpdir"/>
  6. <defaultCache
  7. maxElementsInMemory="10000"
  8. eternal="false"
  9. timeToIdleSeconds="120"
  10. timeToLiveSeconds="120"
  11. overflowToDisk="true"
  12. maxElementsOnDisk="10000000"
  13. diskPersistent="false"
  14. diskExpiryThreadIntervalSeconds="120"
  15. memoryStoreEvictionPolicy="LRU"
  16. />
  17. <cache name="testCache"
  18. maxElementsInMemory="10000"
  19. maxElementsOnDisk="1000"
  20. eternal="false"
  21. overflowToDisk="true"
  22. diskSpoolBufferSizeMB="20"
  23. timeToIdleSeconds="300"
  24. timeToLiveSeconds="600"
  25. memoryStoreEvictionPolicy="LFU"
  26. />
  27. </ehcache> 
<?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，接着咱們來編寫controller、service和dao

1.CacheDemoController：

Java代碼 複製代碼 收藏代碼
  1. package com.netqin.function.cacheDemo;
  3. import org.springframework.beans.factory.annotation.Autowired;
  4. import org.springframework.stereotype.Controller;
  5. import org.springframework.ui.Model;
  6. import org.springframework.web.bind.annotation.RequestMapping;
  8. @Controller
  9. public class CacheDemoController {
  10. @Autowired
  11. private CacheDemoService service;
  13. @RequestMapping("/demo.do")
  14. public String handleIndex(Model model) {
  16. System.out.println(service.getName());
  17. model.addAttribute("name", service.getName());
  19. return "cacheDemo";
  20. }
  21. @RequestMapping("/demoFulsh.do")
  22. public String handleFulsh(Model model) {
  23. service.flush();
  24. return "cacheDemo";
  25. }
  26. } 
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 ：

Java代碼 複製代碼 收藏代碼
  1. package com.netqin.function.cacheDemo;
  3. import org.springframework.beans.factory.annotation.Autowired;
  4. import org.springframework.stereotype.Service;
  5. import org.springmodules.cache.annotations.CacheFlush;
  6. import org.springmodules.cache.annotations.Cacheable;
  8. @Service
  9. public class CacheDemoService {
  10. @Autowired
  11. private CacheDemoDao dao;
  13. @Cacheable(modelId = "testCaching")
  14. public String getName(int id){
  15. System.out.println("Processing testCaching");
  16. return dao.getName(id);
  17. }
  19. @CacheFlush(modelId = "testFlushing")
  20. public void flush(){
  21. System.out.println("Processing testFlushing");
  22. }
  24. } 
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");
	}

}

咱們只對service層加入了註解緩存配置。

接着咱們來寫一個簡單的頁面，cacheDemo.jsp：

Html代碼 複製代碼 收藏代碼
  1. <%@ page language="java" contentType="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" content="text/html; charset=UTF-8">
  7. <title>Insert title here</title>
  8. </head>
  9. <body>
  10. CacheDemo:${name}
  11. </body>
  12. </html> 
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
CacheDemo:${name}
</body>
</html>

ok，一切就緒，咱們啓動服務器，並訪問http://localhost:8080/cache/demo.do

多請求幾回，請求兩次的輸出結果：

Processing testCaching
NameId:0
NameId:0

說明緩存起做用了，ok！

接着咱們刷新該緩存，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

緩存刷新成功。

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