1. memcached client for java客户端API：memcached client for java

引入jar包：java-memcached-2.6.2.jar

package com.pcitc.memcached;

import com.danga.MemCached.*;

public class TestMemcached {
    public static void main(String[] args) {
        /* 初始化SockIOPool，管理memcached的连接池 */
        String[] servers = { "192.168.1.111:11211" };
        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

引入jar包：spymemcached-2.10.3.jar

package com.pcitc.memcached;

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

import net.spy.memcached.MemcachedClient;

public class MClient {

    public static void main(String[] args) {
        setValue();
        getValue();
    }

    // 用spymemcached将对象存入缓存
    public static void setValue() {
        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(
                    "192.168.1.111", 11211));
            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("neead", 900, "someObject");
            if (b.get().booleanValue() == true) {
                mc.shutdown();
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

    // 用spymemcached从缓存中取得对象
    public static void getValue() {
        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(
                    "192.168.1.111", 11211));
            /* 按照key值从memcached中查找缓存，不存在则返回null */
            Object b = mc.get("neead");
            mc.shutdown();
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}

3.两种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。 
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。