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spring整合redis缓存并以注解(@Cacheable、@CachePut、@CacheEvict)形式使用

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maven项目中在pom.xml中依赖2个jar包,其他的spring的jar包省略:

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< dependency >
   < groupId >redis.clients</ groupId >
   < artifactId >jedis</ artifactId >
   < version >2.8.1</ version >
</ dependency >
< dependency >
   < groupId >org.springframework.data</ groupId >
   < artifactId >spring-data-redis</ artifactId >
   < version >1.7.2.RELEASE</ version >
</ dependency >

spring-Redis.xml中的内容:

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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:p = "http://www.springframework.org/schema/p"
   xmlns:context = "http://www.springframework.org/schema/context"
   xmlns:mvc = "http://www.springframework.org/schema/mvc"
   xmlns:cache = "http://www.springframework.org/schema/cache"
   xsi:schemaLocation="http://www.springframework.org/schema/beans  
             http://www.springframework.org/schema/beans/spring-beans-4.2.xsd  
             http://www.springframework.org/schema/context  
             http://www.springframework.org/schema/context/spring-context-4.2.xsd  
             http://www.springframework.org/schema/mvc  
             http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd
             http://www.springframework.org/schema/cache 
             http://www.springframework.org/schema/cache/spring-cache-4.2.xsd"> 
   
   < context:property-placeholder location = "classpath:redis-config.properties" /> 
 
   <!-- 启用缓存注解功能,这个是必须的,否则注解不会生效,另外,该注解一定要声明在spring主配置文件中才会生效 -->
   < cache:annotation-driven cache-manager = "cacheManager" /> 
   
    <!-- redis 相关配置 -->
    < bean id = "poolConfig" class = "redis.clients.jedis.JedisPoolConfig"
      < property name = "maxIdle" value = "${redis.maxIdle}" />  
      < property name = "maxWaitMillis" value = "${redis.maxWait}" /> 
      < property name = "testOnBorrow" value = "${redis.testOnBorrow}" /> 
    </ bean
 
    < bean id = "JedisConnectionFactory" class = "org.springframework.data.redis.connection.jedis.JedisConnectionFactory"
     p:host-name = "${redis.host}" p:port = "${redis.port}" p:password = "${redis.pass}" p:pool-config-ref = "poolConfig" /> 
  
    < bean id = "redisTemplate" class = "org.springframework.data.redis.core.RedisTemplate"
      < property name = "connectionFactory" ref = "JedisConnectionFactory" /> 
    </ bean
   
    <!-- spring自己的缓存管理器,这里定义了缓存位置名称 ,即注解中的value -->
    < bean id = "cacheManager" class = "org.springframework.cache.support.SimpleCacheManager"
      < property name = "caches"
       < set
         <!-- 这里可以配置多个redis -->
         <!-- <bean class="com.cn.util.RedisCache"> 
            <property name="redisTemplate" ref="redisTemplate" /> 
            <property name="name" value="default"/> 
         </bean> -->
         < bean class = "com.cn.util.RedisCache"
            < property name = "redisTemplate" ref = "redisTemplate" /> 
            < property name = "name" value = "common" /> 
            <!-- common名称要在类或方法的注解中使用 -->
         </ bean >
       </ set
      </ property
    </ bean
   
</ beans

redis-config.properties中的内容:

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# Redis settings
# server IP
redis.host=127.0.0.1
# server port
redis.port=6379
# server pass
redis.pass=
# use dbIndex
redis.database=0
# 控制一个pool最多有多少个状态为idle(空闲的)的jedis实例
redis.maxIdle=300
# 表示当borrow(引入)一个jedis实例时,最大的等待时间,如果超过等待时间(毫秒),则直接抛出JedisConnectionException; 
redis.maxWait=3000
# 在borrow一个jedis实例时,是否提前进行validate操作;如果为true,则得到的jedis实例均是可用的 
redis.testOnBorrow=true

com.cn.util.RedisCache类中的内容:

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package com.cn.util; 
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
 
import org.springframework.cache.Cache;
import org.springframework.cache.support.SimpleValueWrapper;
import org.springframework.dao.DataAccessException;
import org.springframework.data.redis.connection.RedisConnection;
import org.springframework.data.redis.core.RedisCallback;
import org.springframework.data.redis.core.RedisTemplate;
 
public class RedisCache implements Cache{
 
   private RedisTemplate<String, Object> redisTemplate; 
   private String name; 
   public RedisTemplate<String, Object> getRedisTemplate() {
     return redisTemplate; 
   }
    
   public void setRedisTemplate(RedisTemplate<String, Object> redisTemplate) {
     this .redisTemplate = redisTemplate; 
   }
    
   public void setName(String name) {
     this .name = name; 
   }
    
   @Override
   public String getName() {
     // TODO Auto-generated method stub 
     return this .name; 
   }
 
   @Override
   public Object getNativeCache() {
    // TODO Auto-generated method stub 
     return this .redisTemplate; 
   }
  
   @Override
   public ValueWrapper get(Object key) {
    // TODO Auto-generated method stub
    System.out.println( "get key" );
    final String keyf = key.toString();
    Object object = null ;
    object = redisTemplate.execute( new RedisCallback<Object>() {
    public Object doInRedis(RedisConnection connection) 
          throws DataAccessException {
      byte [] key = keyf.getBytes();
      byte [] value = connection.get(key);
      if (value == null ) {
        return null ;
       }
      return toObject(value);
      }
     });
     return (object != null ? new SimpleValueWrapper(object) : null );
    }
  
    @Override
    public void put(Object key, Object value) {
     // TODO Auto-generated method stub
     System.out.println( "put key" );
     final String keyf = key.toString(); 
     final Object valuef = value; 
     final long liveTime = 86400
     redisTemplate.execute( new RedisCallback<Long>() { 
       public Long doInRedis(RedisConnection connection) 
           throws DataAccessException { 
         byte [] keyb = keyf.getBytes(); 
         byte [] valueb = toByteArray(valuef); 
         connection.set(keyb, valueb); 
         if (liveTime > 0 ) { 
           connection.expire(keyb, liveTime); 
         
         return 1L; 
       
      }); 
    }
 
    private byte [] toByteArray(Object obj) { 
      byte [] bytes = null
      ByteArrayOutputStream bos = new ByteArrayOutputStream(); 
      try
       ObjectOutputStream oos = new ObjectOutputStream(bos); 
       oos.writeObject(obj); 
       oos.flush(); 
       bytes = bos.toByteArray(); 
       oos.close(); 
       bos.close(); 
      } catch (IOException ex) { 
         ex.printStackTrace(); 
     
      return bytes; 
    
 
     private Object toObject( byte [] bytes) {
      Object obj = null
       try {
         ByteArrayInputStream bis = new ByteArrayInputStream(bytes); 
         ObjectInputStream ois = new ObjectInputStream(bis); 
         obj = ois.readObject(); 
         ois.close(); 
         bis.close(); 
       } catch (IOException ex) { 
         ex.printStackTrace(); 
       } catch (ClassNotFoundException ex) { 
         ex.printStackTrace(); 
      
       return obj; 
     }
  
     @Override
     public void evict(Object key) { 
      // TODO Auto-generated method stub 
      System.out.println( "del key" );
      final String keyf = key.toString(); 
      redisTemplate.execute( new RedisCallback<Long>() { 
      public Long doInRedis(RedisConnection connection) 
           throws DataAccessException { 
        return connection.del(keyf.getBytes()); 
      
      }); 
     }
  
     @Override
     public void clear() { 
       // TODO Auto-generated method stub 
       System.out.println( "clear key" );
       redisTemplate.execute( new RedisCallback<String>() { 
         public String doInRedis(RedisConnection connection) 
             throws DataAccessException { 
          connection.flushDb(); 
           return "ok"
        
       }); 
     }
 
     @Override
     public <T> T get(Object key, Class<T> type) {
       // TODO Auto-generated method stub
       return null ;
     }
   
     @Override
     public ValueWrapper putIfAbsent(Object key, Object value) {
       // TODO Auto-generated method stub
       return null ;
     }
 
}

到了这一步,大部分人会想在web.xml的启动配置文件地方(context-param)加入了spring-redis.xml,让项目启动时加载这个配置文件吧,但是这样启动后注解不生效.

正确的做法是:web.xml中配置了servlet控制器:

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< servlet >
  < servlet-name >SpringMVC</ servlet-name >
  < servlet-class >org.springframework.web.servlet.DispatcherServlet</ servlet-class >
  < init-param >
   < param-name >contextConfigLocation</ param-name >
   < param-value >/WEB-INF/spring-mvc.xml</ param-value >
  </ init-param >
  < load-on-startup >1</ load-on-startup >
  < async-supported >true</ async-supported >
</ servlet >

在DispatcherServlet的初始化过程中,框架会在web应用的 WEB-INF文件夹下寻找名为spring-mvc.xml的配置文件,如果不指定的话,默认是applicationContext.xml 。

只需要在spring-mvc.xml文件中引入spring-redis配置文件即可,正如spring-redis.xml中的启用注解说的:<cache:annotation-driven cache-manager="cacheManager" />注解一定要声明在spring主配置文件中才会生效.

spring-mvc.xml内容,省略了spring与spring MVC整合的那部分:

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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:p = "http://www.springframework.org/schema/p"
   xmlns:context = "http://www.springframework.org/schema/context"
   xmlns:mvc = "http://www.springframework.org/schema/mvc"
   xsi:schemaLocation="http://www.springframework.org/schema/beans  
             http://www.springframework.org/schema/beans/spring-beans-4.2.xsd  
             http://www.springframework.org/schema/context  
             http://www.springframework.org/schema/context/spring-context-4.2.xsd  
             http://www.springframework.org/schema/mvc  
             http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd">
   <!-- 自动扫描该包,使SpringMVC认为包下用了@controller注解的类是控制器 -->
   < context:component-scan base-package = "com.cn" /> 
   
   <!-- 引入同文件夹下的redis属性配置文件 -->
   < import resource = "spring-redis.xml" />
   
</ beans

在service的实现类中:

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@Service
public class UserServiceImpl implements UserService{
 
   @Autowired
   private UserBo userBo;
 
   @Cacheable (value= "common" ,key= "'id_'+#id" )
   public User selectByPrimaryKey(Integer id) {
     return userBo.selectByPrimaryKey(id);
   }
   
   @CachePut (value= "common" ,key= "#user.getUserName()" )
   public void insertSelective(User user) {
     userBo.insertSelective(user);
   }
 
   @CacheEvict (value= "common" ,key= "'id_'+#id" )
   public void deleteByPrimaryKey(Integer id) {
     userBo.deleteByPrimaryKey(id);
   }
}

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持我.

原文链接:http://blog.csdn.net/aqsunkai/article/details/51758900 。

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