Memcached(一)、HelloWorld

一、简介
高性能的架构离不开缓存，分布式缓存中的佼佼者当属memcached，它通过客户端将不同的key hash到不同的memcached服务器中，而获取的时候也到相同的服务器中获取，由于不需要做集群同步，也就省去了集群间同步的开销和延迟，所以它相对于ehcache等缓存来说能更好的支持分布式应用，具有更强的横向伸缩能力。
二、客户端
选择一个memcached客户端，我这里用的是memcached client for java（见附件），其他的还有Spymemcached，国产的有xmemcached，还有很多非java领域客户端。
三、HelloWorld
memcached.properties:

servers=localhost:11211
failover=true
initConn=10
minConn=5
maxConn=250
maintSleep=30
nagle=false
socketTO=3000
aliveCheck=true

单元测试类：

public class MemcachedMain {
    @BeforeClass
    public static void setUpBeforeClass() throws Exception {
       initPool();
    }

    @AfterClass
    public static void tearDownAfterClass() throws Exception {
    }

    @Before
    public void setUp() throws Exception {

    }

    @After
    public void tearDown() throws Exception {

    }
    private static void initPool() throws Exception{
        Properties props = getProperties();
        String[] servers = ((String)props.get("servers")).split(",");
//        String[] servers = {"192.168.137.200:11211"};
        SockIOPool pool = SockIOPool.getInstance();
        pool.setServers(servers);
        pool.setFailover(Boolean.valueOf((String)props.get("failover")));
        pool.setInitConn(Integer.parseInt((String)props.get("initConn")));
        pool.setMinConn(Integer.parseInt((String)props.get("minConn")));
        pool.setMaxConn(Integer.parseInt((String)props.get("maxConn")));
        pool.setMaintSleep(Integer.parseInt((String)props.get("maintSleep")));
        pool.setNagle(Boolean.valueOf((String)props.get("magle")));
        pool.setSocketTO(Integer.parseInt((String)props.get("socketTO")));
        pool.setAliveCheck(Boolean.valueOf((String)props.get("aliveCheck")));
        pool.initialize();
    }
    private static Properties getProperties() throws Exception{
        Properties props = new Properties();
        InputStream in = MemcachedMain.class.getResourceAsStream("/memcached.properties");
        props.load(in);
        return props;
    }
    @Test
    public void memcachedHelloworld() throws Exception{
        MemCachedClient client = new MemCachedClient();
        for (int i = 0; i < 10; i++) {
           boolean success = client.set("" + i, "Memcached Hello world!");
           String result = (String) client.get("" + i);
           System.out.println(String.format("get( %d ): %s", i, result));
        }
    }
}