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

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


   redis.clients
   jedis
   2.8.1


   org.springframework.data
   spring-data-redis
   1.7.2.RELEASE
 
  

spring-redis.xml中的内容:


 
    
      

      
      
    
       
       
            
           
           
       

       
  
       
           
       
    
       
       
           
              
                
                  
                  
                       
                       
                     
                
              
           
       
    
  
 
  

redis-config.properties中的内容:

# 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:

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 redisTemplate;  
    private String name;  
    public RedisTemplate getRedisTemplate() {
	    return redisTemplate;  
	}
	 
	public void setRedisTemplate(RedisTemplate 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() {
      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() {  
           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() {  
         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() {  
	            public String doInRedis(RedisConnection connection)  
	                    throws DataAccessException {  
	              connection.flushDb();  
	                return "ok";  
	           }  
	       });  
	    }

		@Override
		public  T get(Object key, Class 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:

  
    SpringMVC
    org.springframework.web.servlet.DispatcherServlet
    
      contextConfigLocation
      /WEB-INF/spring-mvc.xml
    
    1
    true
  

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: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:



      
      
    
    
    
    
  

在service的实现类中:

@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);
	}
}

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