JAVA客户端调用memcached

1.memcached client for java客户端API：memcached client for java
网址：http://www.whalin.com/memcached
最新版本：java_memcached-release_2.0.1

操作示例：

import com.danga.MemCached.*;
import org.apache.log4j.*;
public class TestMemcached {
    public static void main(String[] args) {
        /*初始化SockIOPool，管理memcached的连接池*/
        String[] servers = { "192.168.1.20:12111" };
        SockIOPool pool = SockIOPool.getInstance();
        pool.setServers(servers);
        pool.setFailover(true);
        pool.setInitConn(10);
        pool.setMinConn(5);
        pool.setMaxConn(250);
        pool.setMaintSleep(30);
        pool.setNagle(false);
        pool.setSocketTO(3000);
        pool.setAliveCheck(true);
        pool.initialize();
        /*建立MemcachedClient实例*/
        MemCachedClient memCachedClient = new MemCachedClient();
        for (int i = 0; i < 10; i++) {
            /*将对象加入到memcached缓存*/
            boolean success = memCachedClient.set("" + i, "Hello!");
            /*从memcached缓存中按key值取对象*/
            String result = (String) memCachedClient.get("" + i);
            System.out.println(String.format("set( %d ): %s", i, success));
            System.out.println(String.format("get( %d ): %s", i, result));
        }
    }
}

import com.danga.MemCached.*;
import org.apache.log4j.*;
public class TestMemcached {
	public static void main(String[] args) {
		/*初始化SockIOPool，管理memcached的连接池*/
		String[] servers = { "192.168.1.20:12111" };
		SockIOPool pool = SockIOPool.getInstance();
		pool.setServers(servers);
		pool.setFailover(true);
		pool.setInitConn(10);
		pool.setMinConn(5);
		pool.setMaxConn(250);
		pool.setMaintSleep(30);
		pool.setNagle(false);
		pool.setSocketTO(3000);
		pool.setAliveCheck(true);
		pool.initialize();
		/*建立MemcachedClient实例*/
		MemCachedClient memCachedClient = new MemCachedClient();
		for (int i = 0; i < 10; i++) {
			/*将对象加入到memcached缓存*/
			boolean success = memCachedClient.set("" + i, "Hello!");
			/*从memcached缓存中按key值取对象*/
			String result = (String) memCachedClient.get("" + i);
			System.out.println(String.format("set( %d ): %s", i, success));
			System.out.println(String.format("get( %d ): %s", i, result));
		}
	}
}

2.spymemcached客户端API：spymemcached client
网址：http://code.google.com/p/spymemcached/
最新版本：memcached-2.1.jar

操作示例：
用spymemcached将对象存入缓存

import java.net.InetSocketAddress;
import java.util.concurrent.Future;

import net.spy.memcached.MemcachedClient;

public class MClient {

    public static void main(String[] args){
        try{
            /*建立MemcachedClient 实例，并指定memcached服务的IP地址和端口号*/
            MemcachedClient mc = new MemcachedClient(new InetSocketAddress("192.168.1.20", 12111));
            Future<Boolean> b = null;
            /*将key值，过期时间(秒)和要缓存的对象set到memcached中*/
            b = mc.set("neea:testDaF:ksIdno", 900, "someObject");
            if(b.get().booleanValue()==true){
                mc.shutdown();
            }
        }
        catch(Exception ex){
            ex.printStackTrace();
        }
    }
}

import java.net.InetSocketAddress;
import java.util.concurrent.Future;

import net.spy.memcached.MemcachedClient;

public class MClient {
	
	public static void main(String[] args){
		try{
			/*建立MemcachedClient 实例，并指定memcached服务的IP地址和端口号*/
			MemcachedClient mc = new MemcachedClient(new InetSocketAddress("192.168.1.20", 12111));
			Future<Boolean> b = null;
			/*将key值，过期时间(秒)和要缓存的对象set到memcached中*/
			b = mc.set("neea:testDaF:ksIdno", 900, "someObject");
			if(b.get().booleanValue()==true){
				mc.shutdown();
			}
		}
		catch(Exception ex){
			ex.printStackTrace();
		}
	}
}

用spymemcached从缓存中取得对象

import java.net.InetSocketAddress;
import java.util.concurrent.Future;

import net.spy.memcached.MemcachedClient;

public class MClient {

    public static void main(String[] args){
        try{
            /*建立MemcachedClient 实例，并指定memcached服务的IP地址和端口号*/
            MemcachedClient mc = new MemcachedClient(new InetSocketAddress("192.168.1.20", 12111));
            /*按照key值从memcached中查找缓存，不存在则返回null */
Object b = mc.get("neea:testDaF:ksIdno ");
            mc.shutdown();
        }
        catch(Exception ex){
            ex.printStackTrace();
        }
    }
}

import java.net.InetSocketAddress;
import java.util.concurrent.Future;

import net.spy.memcached.MemcachedClient;

public class MClient {
	
	public static void main(String[] args){
		try{
			/*建立MemcachedClient 实例，并指定memcached服务的IP地址和端口号*/
			MemcachedClient mc = new MemcachedClient(new InetSocketAddress("192.168.1.20", 12111));
			/*按照key值从memcached中查找缓存，不存在则返回null */
Object b = mc.get("neea:testDaF:ksIdno ");
			mc.shutdown();
		}
		catch(Exception ex){
			ex.printStackTrace();
		}
	}
}

 

3.alisoft-xplatform-asf-cache-2.4

这是国产的memcached client.我花时间测试过,配置简单,使用也简单,有很详细的中文文档和英文文档.
网址：http://code.google.com/p/memcache-client-forjava/
最新版本: alisoft-xplatform-asf-cache-2.5.2.jar

使用例子

memcached.xml

=========================

<?xml version="1.0" encoding="UTF-8"?>
<memcached>
   
    <client name="mclient0" compressEnable="true" defaultEncoding="UTF-8" socketpool="pool0">
        <errorHandler>com.moit.xplatform.asf.cache.memcached.MemcachedErrorHandler</errorHandler>
    </client>
   
    <client name="mclient1" compressEnable="true" defaultEncoding="UTF-8" socketpool="pool1">
        <errorHandler>com.moit.xplatform.asf.cache.memcached.MemcachedErrorHandler</errorHandler>
    </client>
   
    <client name="mclient2" compressEnable="true" defaultEncoding="UTF-8" socketpool="pool2">
        <errorHandler>com.moit.xplatform.asf.cache.memcached.MemcachedErrorHandler</errorHandler>
    </client>

   
    <socketpool name="pool0" failover="true" initConn="5" minConn="5" maxConn="250" maintSleep="0"
        nagle="false" socketTO="3000" aliveCheck="true">
        <servers>192.168.3.251:11211,192.168.3.251:11211</servers>
    </socketpool>
   
    <socketpool name="pool1" failover="true" initConn="5" minConn="5" maxConn="250" maintSleep="0"
        nagle="false" socketTO="3000" aliveCheck="true">
        <servers>192.168.3.251:11211,192.168.3.251:11211</servers>
    </socketpool>
   
    <socketpool name="pool2" failover="true" initConn="5" minConn="5" maxConn="250" maintSleep="0"
        nagle="false" socketTO="3000" aliveCheck="true">
        <servers>192.168.3.251:11211,192.168.3.251:11211</servers>
    </socketpool>

    <cluster name="cluster1">
        <memCachedClients>mclient1,mclient2</memCachedClients>
    </cluster>

</memcached>

 

  //用containsKey方法判断cache服务器按指定的key值是否存在。
  System.out.println("是否包含了key的数据="+cache.containsKey("key"));
  if(cache.containsKey("key"))
  {
    System.out.println("包含了key的数据");
    System.out.println("从cache服务器获得key值");
  }
  else
  {
    System.out.println("没有包含了key的数据");
    System.out.println("cache服务器,没有数据,则去取数据库数据!");
  }
 
  例子：
  static ICacheManager<IMemcachedCache> manager;
 
  /**
   * 测试MemCached
   * @return
   */
  public String memcache()
  { 
    manager = CacheUtil.getCacheManager(IMemcachedCache.class,
    MemcachedCacheManager.class.getName());
    manager.start();
    try
    {
      IMemcachedCache cache = manager.getCache("mclient0");
      //根据key得到缓存数据
      String a =(String)cache.get("key");
      //用containsKey方法判断cache服务器按指定的key值是否存在。
      System.out.println("是否包含了key的数据="+cache.containsKey("key"));
      if(cache.containsKey("key"))
      {
        System.out.println("包含了key的数据");
        System.out.println("从cache服务器获得key值");
      }
      else
      {
        System.out.println("没有包含了key的数据");
        System.out.println("cache服务器,没有数据,则去取数据库数据!");
      }
      //根据key删除服务器上的对应的缓存数据
      cache.remove("key");
      //根据key保存数据到服务器上
      cache.put("key", "你好!"); 
      //设置带有过期时间的例子

      //过30分钟
      Calendar calendar = Calendar.getInstance();//当前日期
        calendar.setTime(new Date());
        calendar.add(Calendar.MINUTE, 30);//
        cache.remove("keytime");
        cache.put("keytime", "30分钟后过期",calendar.getTime());
        System.out.println("30分钟后过期=keytime="+cache.get("keytime"));
        System.out.println("cache服务器getTime="+calendar.getTime());  
  
  }finally{ manager.stop();}

     //jsp 使用请参考test.jsp文件
     return "testmempage";
  }

总结:三种API比较
memcached client for java：较早推出的memcached JAVA客户端API，应用广泛，运行比较稳定。
spymemcached：A simple, asynchronous, single-threaded memcached client written in java. 支持异步，单线程的memcached客户端，用到了java1.5版本的concurrent和nio，存取速度会高于前者，但是稳定性不好，测试中常报timeOut等相关异常。

alisoft-xplatform-asf-cache-2.4 我开始采用,后来发现性能很差,尤其是调用频繁时特别容易出问题.我后来还是采用第一个.现在还没发现什么问题.
由于memcached client for java发布了新版本，性能上有所提高，并且运行稳定，所以建议使用memcached client for java。