java spring using annotations to implement caching

 

example here using spring3.1.4 + ehcache

 

use of annotations added cache is spring3.1

 

use:

 

1.ehcache dependency + spring dependency

 

  

<!-- ehcache依赖--> 
<dependency> 
    <groupId>net.sf.ehcache</groupId> 
    <artifactId>ehcache</artifactId> 
    <version>2.7.2</version> 
</dependency>

 

 

  

        <dependency> 
            <groupId>org.springframework</groupId> 
            <artifactId>spring-core</artifactId> 
            <version>3.1.4.RELEASE</version> 
        </dependency> 
        <dependency> 
            <groupId>org.springframework</groupId> 
            <artifactId>spring-web</artifactId> 
            <version>3.1.4.RELEASE</version> 
        </dependency> 
        <dependency> 
            <groupId>org.springframework</groupId> 
            <artifactId>spring-webmvc</artifactId> 
            <version>3.1.4.RELEASE</version> 
        </dependency>
        <!-- 这里有注解类需要的jar -->
        <dependency> 
            <groupId>org.springframework</groupId> 
            <artifactId>spring-context</artifactId> 
            <version>3.1.4.RELEASE</version> 
        </dependency>

  

cglib
< span> cglib
2.2.2
< / dependency>

  

 

 

2.spring + ehcache simple configuration

 

Ehcache basic configuration, meaning specific parameters see: http://www.ehcache.org/documentation/configuration/configuration

                                                                                                                                                                                             

name	cache unique identifier
maxElementsInMemory	create maximum number of
eternal	whether the cache is permanent, default false
timeToLiveSeconds	cache survival time
timeToIdleSeconds	long without access to clear the cache
overflowToDisk	memory is written to disk, the default False
maxElementsOnDisk	persisted to disk maximum number
memoryStoreEvictionPolicy	the cache is full, clear cache rules, comes with three kinds: FIFO (First In First Out), LFU (least used), LRU (least recently used)
diskSpoolBufferSizeMB	disk cache buffer size, the default 30M
diskExpiryThreadIntervalSeconds	disk failure thread time interval

 

2.1 ehcache.xml first create a configuration file

 

  

<ehcache> 
    <defaultCache 
            maxElementsInMemory="10000" 
            eternal="false" 
            timeToIdleSeconds="120" 
            timeToLiveSeconds="120" 
            overflowToDisk="false" 
            maxElementsOnDisk="10000000" 
            diskPersistent="false" 
            diskExpiryThreadIntervalSeconds="120" 
            memoryStoreEvictionPolicy="LRU" 
            /> 
 
    <cache 
            name="onecache" 
            maxElementsInMemory="10000" 
            eternal="false" 
            overflowToDisk="false" 
            timeToIdleSeconds="10" 
            timeToLiveSeconds="10"/> 
</ehcache>

 

 

 

 

2.2 in the spring of apllication.xml join injected cache

 

  

    <cache:annotation-driven cache-manager="cacheManager"/> 
 
    <bean id="cacheManager" class="org.springframework.cache.ehcache.EhCacheCacheManager" 
          p:cacheManager-ref="ehcache"/> 
    <bean id="ehcache" class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean" 
          p:configLocation="classpath:ehcache.xml" 
          p:shared="true"/>

 

 

here also need to head into the configuration file

 

  

 xmlns:cache="http://www.springframework.org/schema/cache" 
 xmlns:p="http://www.springframework.org/schema/p" 
 xsi:schemaLocation=" 
      ... 
        http://www.springframework.org/schema/cache   http://www.springframework.org/schema/cache/spring-cache-3.1.xsd 
        "

 

 

to add the mvc-servlet.xml

 

  

  <mvc:annotation-driven/>  <!-- 挺重要的，不加注解不会被扫描-->

 

 

3. annotation using

 

3.1 for object class

 

  

@Cacheable(value = "onecache")
class A1{}

 

 

This class method return values ​​are cached,

 

3.2 for method method

 

  

 @Cacheable(value = "onecache", key = "#name",condition = "#age < 25") 
  public xx findEmployeeBySurname(String firstName, String name, int age) { 
    return xxx 
  }

 

 

This will be the value of age is less than 25, according to name the key cache

 

3.3 Clear

 

  

@CacheEvict(value="onecache",key="#name + 'haha'") 
public void delete(String name) { 
System.out.println("delete one name"); 
}

 

 You can also use the following

Clear All

 

  

@CacheEvict(value="oneCache",allEntries=true)

 

 

4. code calls

 

  

  @Autowired 
    private CacheManager cacheManager; 
 
    //获取当前时间 
    public String getABCCache() {        
            cacheManager.getCache("ccc").put("hello", new Date().toString()); 
            return (String) cacheManager.getCache("ccc").get("hello").get(); 
    }