memcached-java客户端xmemcached简单使用

1. 前一篇文章简单说了下如何安装memcached，想到了memcached是分布式的缓存框架，所以自己在公司的3台测试机上安装了下。

2. 关于什么是xmemcached就不多说了，其实就是实现了memcached的java客户端，关于分布式下一篇会稍微详细点介绍，这里只要知道这个分布式其实是客户端的分布式，其实是没有主从节点的概念的。

3. 直接贴代码，看看如何使用

import java.io.IOException;import java.util.concurrent.TimeoutException;import net.rubyeye.xmemcached.CASOperation;import net.rubyeye.xmemcached.MemcachedClient;import net.rubyeye.xmemcached.MemcachedClientBuilder;import net.rubyeye.xmemcached.XMemcachedClientBuilder;import net.rubyeye.xmemcached.exception.MemcachedException;import net.rubyeye.xmemcached.utils.AddrUtil;public class Cache {private MemcachedClientBuilder builder = null;private MemcachedClient client = null;public Cache(String address, int[] weight) {builder = new XMemcachedClientBuilder(AddrUtil.getAddresses(address), weight);builder.setConnectionPoolSize(5);try {client = builder.build();} catch (IOException e) {e.printStackTrace();}}public void set(String key, int exp, Object value) {try {if (!client.set(key, exp, value)) {System.err.println("set error, key is " + key + " value is " + value);}} catch (TimeoutException e) {e.printStackTrace();} catch (InterruptedException e) {e.printStackTrace();} catch (MemcachedException e) {e.printStackTrace();}}public void delete(String key) {try {client.delete(key);} catch (TimeoutException e) {e.printStackTrace();} catch (InterruptedException e) {e.printStackTrace();} catch (MemcachedException e) {e.printStackTrace();}}public void update(String key, final Object value) {try {client.cas(key, 10, new CASOperation<Object>() {public int getMaxTries() {return 1;}public Object getNewValue(long currentCAS, Object currentValue) {return value;}});} catch (TimeoutException e) {e.printStackTrace();} catch (InterruptedException e) {e.printStackTrace();} catch (MemcachedException e) {e.printStackTrace();}}public Object get(String key) {try {return client.get(key);} catch (TimeoutException e) {e.printStackTrace();} catch (InterruptedException e) {e.printStackTrace();} catch (MemcachedException e) {e.printStackTrace();}return null;}public void addServer(String server, int port, int weight) {try {client.addServer(server, port, weight);} catch (IOException e) {e.printStackTrace();}}public void removeServer(String hostList) {client.removeServer(hostList);}}

这个类做了一个特别简单的封装，包括了增删改查还有动态添加删除节点，其实就是简单得使用了下api，其实api很多，大家可以自己查api

下面是一个测试类

public static void main(String[] args) {//testCRUD();testSerObject();}public static void testCRUD() {String address = "xx01:11211 xx02:11211 xx03:11211";Cache cache = new Cache(address, new int[] { 1, 1, 1 });cache.set("hello", 10, "test");System.out.println(cache.get("hello"));cache.update("hello", "ssss");System.out.println(cache.get("hello"));cache.delete("hello");System.out.println(cache.get("hello"));}public static void testSerObject() {String address = "arreat00:11211 arreat01:11211 arreat02:11211";Cache cache = new Cache(address, new int[] { 1, 1, 1 });User user = new User();user.setId(1);user.setMobile("13564316073");user.setEmail("[e-mail]");user.setPasswd("ttt");user.setUserName("qianjc");List<String> asseat = new ArrayList<String>();asseat.add("asseat0");asseat.add("asseat1");Map<String, String> car = new HashMap<String, String>(); car.put("car1", "val1");car.put("car2", "val2");user.setAsseat(asseat);user.setCar(car);user.setBook(buildBook(1, "memcached进阶", "smart出版"));user.setBooks(buildBooks());//cache.set("user1", 0, user);System.out.println(cache.get("user1"));}public static Book buildBook(int id, String name, String pulish) {Book book = new Book();book.setId(id);book.setName(name);book.setPulish(pulish);return book;}public static List<Book> buildBooks() {List<Book> books = new ArrayList<Book>();for (int i = 0; i < 2; ++i) {books.add(buildBook(i, "memcached进阶" + i, "smart出版" + i));}return books;}}

可以看到memcached不仅仅支持简单String,int等类型，只要实现了Serializable接口的java序列化对象都可以

具体怎么使用可以查api，还是比较简单的！！
也可以参考一篇博客：http://blog.csdn.net/ljhabc1982/article/details/6338898