memcache：http://memcached.org/

github地址：https://github.com/killme2008/xmemcached

其他客户端：

https://code.google.com/archive/p/spymemcached/

http://github.com/gwhalin/Memcached-Java-Client

我本地安装了个windows版的memcached客户端，并添加为windows服务。

添加maven包：

    
    
           
     
      com.googlecode.xmemcached
           
     
      xmemcached
           
     
      2.0.0
         
    

做个简单的testcase：

package com.raycloud.maijia.schedule.utils;import java.io.IOException;import java.util.concurrent.TimeoutException;import net.rubyeye.xmemcached.MemcachedClient;import net.rubyeye.xmemcached.XMemcachedClient;import net.rubyeye.xmemcached.exception.MemcachedException;import org.junit.Test;public class TestMemcached {        @Test    public void testIt(){        try {            MemcachedClient client = new XMemcachedClient("127.0.0.1", 11556);            String testVal = "this is a test demo.";            client.set("test_key", 10, testVal);            Thread.sleep(5000);            System.out.println("=================" + client.get("test_key"));            Thread.sleep(15000);            System.out.println("=================" + client.get("test_key"));        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (TimeoutException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (InterruptedException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (MemcachedException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }        }

输出结果：

13:51:57.904 [Xmemcached-Reactor-2] DEBUG c.g.c.y.core.impl.AbstractSession - read 64 bytes from channel=================this is a test demo.13:52:02.906 [Xmemcached-Reactor-2] DEBUG n.r.xmemcached.impl.MemcachedHandler - Check session (%s) is alive,send heartbeat13:52:02.907 [Xmemcached-Reactor-2] DEBUG c.g.c.y.core.impl.AbstractSession - After encodingversion13:52:02.908 [Xmemcached-Reactor-2] DEBUG n.rubyeye.xmemcached.impl.Optimizer - Optimieze merge buffer:version13:52:02.908 [Xmemcached-Reactor-2] DEBUG c.g.c.y.core.impl.AbstractSession - send buffers:[ buffer:position=0,limit=9,capacity=9]13:52:02.910 [Xmemcached-Reactor-2] DEBUG c.g.c.y.core.impl.AbstractSession - read 16 bytes from channel13:52:07.911 [Xmemcached-Reactor-2] DEBUG n.r.xmemcached.impl.MemcachedHandler - Check session (%s) is alive,send heartbeat13:52:07.912 [Xmemcached-Reactor-2] DEBUG c.g.c.y.core.impl.AbstractSession - After encodingversion13:52:07.912 [Xmemcached-Reactor-2] DEBUG n.rubyeye.xmemcached.impl.Optimizer - Optimieze merge buffer:version13:52:07.912 [Xmemcached-Reactor-2] DEBUG c.g.c.y.core.impl.AbstractSession - send buffers:[ buffer:position=0,limit=9,capacity=9]13:52:07.924 [Xmemcached-Reactor-2] DEBUG c.g.c.y.core.impl.AbstractSession - read 16 bytes from channel13:52:12.906 [main] DEBUG c.g.c.y.core.impl.AbstractSession - After encodingget test_key13:52:12.907 [Xmemcached-Reactor-2] DEBUG n.rubyeye.xmemcached.impl.Optimizer - Optimieze merge buffer:get test_key13:52:12.908 [Xmemcached-Reactor-2] DEBUG c.g.c.y.core.impl.AbstractSession - send buffers:[ buffer:position=0,limit=14,capacity=14]13:52:12.909 [Xmemcached-Reactor-2] DEBUG c.g.c.y.core.impl.AbstractSession - read 5 bytes from channel=================null

spring配置：

    
    
             
     
                  
      
       ${memcached.url}
                      
      
                   
       
                    
       
      
     
    

此处注意对象的比较和变量的比较

其他：

memcached客户端集群，以及使用repcached补丁实现主从复制：

还可以使用代理服务：http://code.google.com/p/memagent/

常见问题：

一、net.rubyeye.xmemcached.exception.MemcachedException: Binary protocol doesn't support iterating all keys in memcached

二进制协议不支持遍历key，文本协议支持（memcache不建议遍历key，后续版本可能会下线）

KeyIterator it = memcachedClient.getKeyIterator(new        InetSocketAddress("127.0.0.1", 11556));while(it.hasNext()){    String key = it.next();    logger.info("=========key========" + key);}