我的应用程序是Spring MVC应用程序。尝试使用基于Spring Annotation的缓存。但它不起作用。请参阅下面的代码
1. pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.giggal.spring</groupId>
<artifactId>spring-tutorial-mvc</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
......
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.3.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>4.3.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>4.3.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>4.3.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>4.3.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>4.3.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>4.3.4.RELEASE</version>
</dependency>
<!-- Servlet -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<!-- EHCache -->
<dependency>
<groupId>net.sf.ehcache</groupId>
<artifactId>ehcache</artifactId>
<version>2.10.2.2.21</version>
</dependency>
</dependencies>
</project>
2. My Spring app consists of two context xml config files, the first one app-ctx.xml only scans non-@Controller annotated beans:
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:cache="http://www.springframework.org/schema/cache"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.1.xsd
http://www.springframework.org/schema/cache
http://www.springframework.org/schema/cache/spring-cache.xsd">
<context:component-scan base-package="com.giggal.spring">
<context:exclude-filter expression="org.springframework.stereotype.Controller" type="annotation" />
</context:component-scan>
<bean id="cacheManager" class="org.springframework.cache.ehcache.EhCacheCacheManager">
<property name="cacheManager" ref="ehcache" />
</bean>
<bean id="ehcache"
class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean">
<property name="configLocation" value="classpath:ehcache.xml" />
<property name="shared" value="true" />
</bean>
.....
</beans>
3. The second one mvc-config.xml contains all spring-mvc setup and scans @Controller annotated 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:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.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.xsd">
<context:component-scan base-package="com.giggal.spring" use-default-filters="false">
<context:include-filter expression="org.springframework.stereotype.Controller"
type="annotation" />
</context:component-scan>
<mvc:annotation-driven />
<!-- 2. HandlerMapping : Used default handler mapping internally -->
<!-- 3. ViewResolver -->
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<!-- Example: a logical view name of 'showMessage' is mapped to '/WEB-INF/jsp/showMessage.jsp' -->
<property name="prefix" value="/WEB-INF/view/" />
<property name="suffix" value=".jsp" />
</bean>
</beans>
4. The ehcache.xml used for caching with cache name emp :
<?xml version="1.0" encoding="UTF-8"?>
<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="http://ehcache.org/ehcache.xsd">
<defaultCache eternal="true" maxElementsInMemory="100"
overflowToDisk="false" />
<cache name="emp" maxElementsInMemory="10000" eternal="true"
overflowToDisk="false" />
</ehcache>
5. The controller class UserController
@Controller
@RequestMapping(value = "/user/")
public class UserController {
@Autowired
UserService userService; // Service which will do all data
// retrieval/manipulation work
@RequestMapping(value = "/getAllUsers/", method = RequestMethod.GET)
public ModelAndView listAllUsers() {
ModelAndView mav = new ModelAndView("user/user_list");
List<User> users = userService.findAllUsers();
mav.addObject("users", users);
return mav;
}
......
}
6. UserService class:
@Service("userService")
@Transactional
public class UserServiceImpl implements UserService {
private static final AtomicLong counter = new AtomicLong();
private static List<User> users;
static {
users = populateDummyUsers();
}
@Cacheable("emp")
public List<User> findAllUsers() {
System.out.println("execute getEmployee method..");
return users;
}
....
}
但是findAllUsers（）方法调用永远不会被缓存，我总是每次都获得sysout“执行getEmployee方法..”。可能是什么原因导致的肯定有一些关于缓存注释的东西我还不了解。
But the same code is working as below
1.
@Configuration
@EnableCaching
@ComponentScan({ "com.giggal.*" })
public class AppConfig {
@Bean
public CacheManager cacheManager() {
return new EhCacheCacheManager(ehCacheCacheManager().getObject());
}
@Bean
public EhCacheManagerFactoryBean ehCacheCacheManager() {
EhCacheManagerFactoryBean cmfb = new EhCacheManagerFactoryBean();
cmfb.setConfigLocation(new ClassPathResource("ehcache.xml"));
cmfb.setShared(true);
return cmfb;
}
}
---
@Controller
@RequestMapping(value = "/user/")
public class UserController {
@RequestMapping(value = "/getAllUsers/", method = RequestMethod.GET)
public ModelAndView listAllUsers() {
AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(com.giggal.spring.AppConfig.class);
UserService obj = (UserService) context.getBean("userService");
List<User> users = obj.findAllUsers();
ModelAndView mav = new ModelAndView("user/user_list");
//List<User> users = userService.findAllUsers();
mav.addObject("users", users);
return mav;
}
..}
请建议使用注释的机制
答案 0 :(得分：2)
在xml配置中，您需要添加
<cache:annotation-driven />
以便弹簧选择@Cacheable注释。
@EnableCaching和<cache:annotation-driven/>负责 注册必要的Spring组件 注释驱动的缓存管理，例如CacheInterceptor和 基于代理或基于AspectJ的建议，将拦截器编织进去 调用@Cacheable方法时的调用堆栈。