memcached 命令： http://donald-draper.iteye.com/blog/2395628
memcache Java客户端有三种方式具体介绍可以参见下面这篇文章：
Memcache的三种Java客户端的对比和选择: http://blog.csdn.net/heiyueya/article/details/64441901
三种方式分别为：
1.官方提供的基于传统阻塞io由Greg Whalin维护的客户端memcached client for java
网址： http://www.whalin.com/memcached
特点： 较早推出的memcached JAVA客户端API，应用广泛，运行比较稳定，使用阻塞IO，不支持CAS操作。
github: https://github.com/gwhalin/Memcached-Java-Client
2.Dustin Sallings实现的基于java nio的Spymemcached
网址： http://code.google.com/p/spymemcached/
最新版本：memcached-2.1.jar
特点： A simple, asynchronous, single-threaded memcached client written in java.
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，支持CAS操作。
github: https://github.com/dustin/java-memcached-client
3.XMemcached
XMemcached同样是基于Java NIO的客户端，Java NIO相比于传统阻塞IO模型来说，
有效率高（特别在高并发下）和资源耗费相对较少的优点。传统阻塞IO为了提高效率，
需要创建一定数量的连接形成连接池，而NIO仅需要一个连接即可（当然,NIO也是可以做池化处理），相对来说减少了线程创建和切换的开销，这一点在高并发下特别明显。
因此 XMemcached与Spymemcached在性能都非常优秀，在某些方面（存储的数据比较小的情况下）Xmemcached比
Spymemcached的表现更为优秀。
github: https://github.com/killme2008/xmemcached
我们选择XMemcached来实现Memcache的客户端：
本文的源代码可以从以下地址load:
https://github.com/Donaldhan/memcached-demo
启动memcached：
[memcached@donald ~]$ memcached -p 11211 -d -u memcached -l 192.168.126.128 -c 1024 [memcached@donald ~]$ ps -ef | grep memcached root 4514 1248 0 22:01 ? 00:00:00 sshd: memcached [priv] memcach+ 4517 4514 0 22:01 ? 00:00:00 sshd: memcached@pts/1 memcach+ 5172 1 0 22:04 ? 00:00:00 memcached -p 11211 -d -u memcached -l 192.168.126.128 -c 1024 memcach+ 5238 4522 0 22:07 pts/1 00:00:00 grep --color=auto memcached [memcached@donald ~]$
创建memcache属性文件memcached.properties：
############################ ##memcached server ip address list ############standby############## standbyServerList=192.168.126.128:11211 poolName=sidsock poolSize=16
创建属性文件工具类：
package util;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
*
* @author donald
* 2017年9月29日
* 下午10:21:34
*/
public class PropertiesUtil {
private static final Logger log = LoggerFactory.getLogger(PropertiesUtil.class);
private static final String MEMCACHED_CONFIG_FILE = "memcached.properties";
private static volatile PropertiesUtil instance = null;
private static Properties properties = null;
static{
if (properties == null) {
properties = new Properties();
}
try {
InputStream inputStream = Thread.currentThread().getContextClassLoader()
.getResourceAsStream(MEMCACHED_CONFIG_FILE);
properties.load(inputStream);
} catch (IOException e1) {
e1.printStackTrace();
}
}
/**
*
* @return
*/
public static synchronized PropertiesUtil getInstance() {
if (instance == null) {
instance = new PropertiesUtil();
}
return instance;
}
/**
*
* @param key
* @return
*/
public String getProperty(String key) {
return properties.getProperty(key);
}
/**
* 获取属性int值
* @param key
* @return
*/
public Integer getInteger(String key) {
String value = properties.getProperty(key);
return Integer.valueOf(value);
}
public static void main(String[] args) {
log.info("serverList:"+PropertiesUtil.getInstance().getProperty("standbyServerList"));
}
}
创建memcache客户端：
package bootstrap;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.util.List;
import java.util.concurrent.TimeoutException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import net.rubyeye.xmemcached.Counter;
import net.rubyeye.xmemcached.GetsResponse;
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;
import util.PropertiesUtil;
/**
* Memcached Standby模式 客户端
* @author donald
* 2017年10月10日
* 下午12:49:45
*/
public class MemcachedStandbyClient {
private static final Logger log = LoggerFactory.getLogger(MemcachedStandbyClient.class);
private static final String MEMCACHED_SERVER_LIST = "standbyServerList";
private static final String MEMCACHED_POOL_SIZE = "poolSize";
private static PropertiesUtil propertiesUtil = PropertiesUtil.getInstance();
private static volatile MemcachedStandbyClient instance;
private static MemcachedClientBuilder builder;
private static MemcachedClient memcachedClient;
static{
String standbyServerList = propertiesUtil.getProperty(MEMCACHED_SERVER_LIST);
List serverAddresses = AddrUtil.getAddresses(standbyServerList);
builder = new XMemcachedClientBuilder(serverAddresses);
/**
* Xmemcached是基于java nio的client实现，默认对一个memcached节点只有一个连接，
* 这在通常情况下已经有非常优异的表现。但是在典型的高并发环境下,nio的单连接也会遇到性能瓶颈。
* 因此XMemcached支持设置nio的连接池，允许建立多个连接到同一个memcached节点，
* 但是请注意，这些连接之间是不同步的，因此你的应用需要自己保证数据更新的同步，启用连接池可以通过下面代码：
*/
/*int poolSize = propertiesUtil.getInteger(MEMCACHED_POOL_SIZE);
builder.setConnectionPoolSize(poolSize);
*/
try {
memcachedClient = builder.build();
} catch (IOException e) {
log.error("连接异常");
e.printStackTrace();
}
}
public static synchronized MemcachedStandbyClient getInstance() {
if (instance == null) {
instance = new MemcachedStandbyClient();
}
return instance;
}
/**
*
* @param key
* @param value
* @return
*/
public boolean set(String key,Object value){
return set(key, 0, value);
}
/**
*
* @param key
* @param expire 过期时间秒
* @param value
* @return
*/
public boolean set(String key,int expire,Object value){
boolean finish = false;
try {
finish = memcachedClient.set(key, expire, value);
} catch (TimeoutException e) {
log.error("set超时");
e.printStackTrace();
} catch (InterruptedException e) {
log.error("set中断异常");
e.printStackTrace();
} catch (MemcachedException e) {
log.error("set错误");
e.printStackTrace();
}
return finish;
}
/**
*
* @param key
* @param value
* @return
*/
public boolean add(String key,Object value){
return add(key, 0, value);
}
/**
*
* @param key
* @param expire 过期时间秒
* @param value
* @return
*/
public boolean add(String key,int expire,Object value){
boolean finish = false;
try {
finish = memcachedClient.add(key, expire, value);
} catch (TimeoutException e) {
log.error("add超时");
e.printStackTrace();
} catch (InterruptedException e) {
log.error("add中断异常");
e.printStackTrace();
} catch (MemcachedException e) {
log.error("add错误");
e.printStackTrace();
}
return finish;
}
/**
*
* @param key
* @return
*/
public Object get(String key){
Object value = null;
try {
value = memcachedClient.get(key);
} catch (TimeoutException e) {
log.error("get超时");
e.printStackTrace();
} catch (InterruptedException e) {
log.error("get中断异常");
e.printStackTrace();
} catch (MemcachedException e) {
log.error("get操作错误");
e.printStackTrace();
}
return value;
}
/**
*
* @param key
* @param appendValue
* @return
*/
public boolean append(String key,Object appendValue){
boolean finish = false;
try {
finish = memcachedClient.append(key, appendValue);
} catch (TimeoutException e) {
log.error("append超时");
e.printStackTrace();
} catch (InterruptedException e) {
log.error("append中断异常");
e.printStackTrace();
} catch (MemcachedException e) {
log.error("append操作错误");
e.printStackTrace();
}
return finish;
}
/**
*
* @param key
* @param prependValue
* @return
*/
public boolean prepend(String key,Object prependValue){
boolean finish = false;
try {
finish = memcachedClient.prepend(key, prependValue);
} catch (TimeoutException e) {
log.error("prepend超时");
e.printStackTrace();
} catch (InterruptedException e) {
log.error("prepend中断异常");
e.printStackTrace();
} catch (MemcachedException e) {
log.error("prepend操作错误");
e.printStackTrace();
}
return finish;
}
/**
*
* @param key
* @param value
* @return
*/
public boolean replace(String key,Object value){
return replace(key, 0, value);
}
/**
*
* @param key
* @param expire 过期时间秒
* @param value
* @return
*/
public boolean replace(String key,int expire,Object value){
boolean finish = false;
try {
finish = memcachedClient.replace(key, expire, value);
} catch (TimeoutException e) {
log.error("replace超时");
e.printStackTrace();
} catch (InterruptedException e) {
log.error("replace中断异常");
e.printStackTrace();
} catch (MemcachedException e) {
log.error("replace错误");
e.printStackTrace();
}
return finish;
}
/**
*
* @param key
* @param expire
* @return
*/
public boolean touch(String key,int expire){
boolean finish = false;
try {
finish = memcachedClient.touch(key, expire);
} catch (TimeoutException e) {
log.error("touch超时");
e.printStackTrace();
} catch (InterruptedException e) {
log.error("touch中断异常");
e.printStackTrace();
} catch (MemcachedException e) {
log.error("touch操作错误");
e.printStackTrace();
}
return finish;
}
/**
* @param key
* @param step
* @param defalut
* @return
*/
public long incr(String key,long step,long defalut){
long value = 0;
try {
value = memcachedClient.incr(key, step, defalut);
} catch (TimeoutException e) {
log.error("incr超时");
e.printStackTrace();
} catch (InterruptedException e) {
log.error("incr中断异常");
e.printStackTrace();
} catch (MemcachedException e) {
log.error("incr操作错误");
e.printStackTrace();
}
return value;
}
/**
*
* @param key
* @param step
* @return
*/
public long incr(String key,long step){
long value = 0;
try {
value = memcachedClient.incr(key, step);
} catch (TimeoutException e) {
log.error("incr超时");
e.printStackTrace();
} catch (InterruptedException e) {
log.error("incr中断异常");
e.printStackTrace();
} catch (MemcachedException e) {
log.error("incr操作错误");
e.printStackTrace();
}
return value;
}
/**
*
* @param key
* @param step
* @return
*/
public long decr(String key,long step){
long value = 0;
try {
value = memcachedClient.decr(key, step);
} catch (TimeoutException e) {
log.error("decr超时");
e.printStackTrace();
} catch (InterruptedException e) {
log.error("decr中断异常");
e.printStackTrace();
} catch (MemcachedException e) {
log.error("decr操作错误");
e.printStackTrace();
}
return value;
}
/**
*
* @param key
* @return
*/
public long gets(String key){
long sid = 0;
try {
GetsResponse result = memcachedClient.gets(key);
sid = result.getCas();
} catch (TimeoutException e) {
log.error("gets超时");
e.printStackTrace();
} catch (InterruptedException e) {
log.error("gets中断异常");
e.printStackTrace();
} catch (MemcachedException e) {
log.error("gets操作错误");
e.printStackTrace();
}
return sid;
}
/**
*
* @param key
* @param obj
* @return
*/
public boolean cas(String key,Object obj){
boolean finish = false;
long sid = gets(key);
finish = cas(key, 0, obj, sid);
return finish;
}
/**
*
* @param key
* @param expire
* @param obj
* @param sid key当前版本id
* @return
*/
public boolean cas(String key, int expire, Object obj, long sid){
boolean finish = false;
try {
finish = memcachedClient.cas(key, expire, obj, sid);
} catch (TimeoutException e) {
log.error("cas超时");
e.printStackTrace();
} catch (InterruptedException e) {
log.error("cas中断异常");
e.printStackTrace();
} catch (MemcachedException e) {
log.error("cas操作错误");
e.printStackTrace();
}
return finish;
}
/**
* @param key
* @return
*/
public boolean delete(String key){
boolean finish = false;
try {
finish = memcachedClient.delete(key);
} catch (TimeoutException e) {
log.error("delete超时");
e.printStackTrace();
} catch (InterruptedException e) {
log.error("delete中断异常");
e.printStackTrace();
} catch (MemcachedException e) {
log.error("delete操作错误");
e.printStackTrace();
}
return finish;
}
/**
*
* @param key
* @return
*/
public void deleteWithNoReply(String key){
try {
memcachedClient.deleteWithNoReply(key);
} catch (InterruptedException e) {
log.error("deleteWithNoReply中断异常");
e.printStackTrace();
} catch (MemcachedException e) {
log.error("deleteWithNoReply操作错误");
e.printStackTrace();
}
}
/**
* @param key
* @return
*/
public Counter getCounter(String key) {
return getCounter(key,0);
}
/**
* @param key
* @param init
* @return
*/
public Counter getCounter(String key,int init) {
Counter counter = memcachedClient.getCounter(key,init);
return counter;
}
/**
*
*/
public void flushAll(){
try {
memcachedClient.flushAll();
} catch (TimeoutException e) {
log.error("flushAll超时");
e.printStackTrace();
} catch (InterruptedException e) {
log.error("flushAll中断异常");
e.printStackTrace();
} catch (MemcachedException e) {
log.error("flushAll操作错误");
e.printStackTrace();
}
}
public void shutdown(){
try {
memcachedClient.shutdown();
} catch (IOException e) {
log.error("客户端关闭异常");
e.printStackTrace();
}
}
/* (non-Javadoc)
* @see java.lang.Object#finalize()
*/
@Override
protected void finalize() {
try {
memcachedClient.shutdown();
} catch (IOException e) {
log.error("memcached 关闭客户端连接失败！");
e.printStackTrace();
}
}
}
创建测试类：
package bootstrap;
import java.util.concurrent.TimeoutException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import net.rubyeye.xmemcached.Counter;
import net.rubyeye.xmemcached.exception.MemcachedException;
/**
* Memcached Standby模式 客户端测试类
* @author
* donald
* 2017年10月10日
* 下午12:49:45
*/
public class MemcachedStandbyClientTest {
private static final Logger log = LoggerFactory.getLogger(MemcachedStandbyClientTest.class);
public static void main(String[] args) {
MemcachedStandbyClient memcachedClient = MemcachedStandbyClient.getInstance();
memcachedClient.set("name", 0, "donald");
String value = (String) memcachedClient.get("name");
log.info("set name={}", value);
memcachedClient.delete("name");
value = (String) memcachedClient.get("name");
log.info("delete name={}", value);
if (!memcachedClient.set("name", 0, "jamel")) {
log.error("set error");
}
value = (String) memcachedClient.get("name");
log.info("set name={}", value);
if (memcachedClient.add("name", 0, "donald")) {
log.error("Add error,key is existed");
}
value = (String) memcachedClient.get("name");
log.info("name={}", value);
if (!memcachedClient.replace("name", 0, "rain")) {
log.error("replace error");
}
value = (String) memcachedClient.get("name");
log.info("repalce name={}", value);
memcachedClient.append("name", "-han");
value = (String) memcachedClient.get("name");
log.info("append name={}", value);
memcachedClient.prepend("name", "0-");
value = (String) memcachedClient.get("name");
log.info("prepend name={}", value);
memcachedClient.touch("name", 3);
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
e.printStackTrace();
}
value = (String) memcachedClient.get("name");
log.info("after touch name={}", value);
memcachedClient.deleteWithNoReply("name");
memcachedClient.set("age", 0, "27");
log.info("age={}", memcachedClient.get("age"));
memcachedClient.incr("age", 2, 1);// age 增加2，age不存在，则为1
memcachedClient.incr("age", 1);
log.info("incr age={}", memcachedClient.get("age"));
memcachedClient.decr("age", 2);
log.info("decr age={}", memcachedClient.get("age"));
if (!memcachedClient.cas("age", 27)) {
log.error("cas error");
}
log.info("cas age={}", memcachedClient.get("age"));
Counter counter = memcachedClient.getCounter("counter", 0);
try {
log.info("incrementAndGet counter,{}", counter.incrementAndGet());
log.info("decrementAndGet counter,{}", counter.decrementAndGet());
log.info("addAndGet counter,{}", counter.addAndGet(3));
} catch (MemcachedException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
} catch (TimeoutException e) {
e.printStackTrace();
}
memcachedClient.flushAll();
memcachedClient.shutdown();
}
}
运行测试类，控制台输出如下：
22:20:09.815 [main] INFO net.rubyeye.xmemcached.XMemcachedClient 729- XMemcachedClient is using Text protocol 22:20:09.859 [main] INFO com.google.code.yanf4j.nio.impl.SelectorManager 37- Creating 4 reactors... 22:20:09.876 [main] INFO com.google.code.yanf4j.core.impl.AbstractController 377- The Controller started at localhost/127.0.0.1:0 ... 22:20:18.928 [Xmemcached-Reactor-0] INFO com.google.code.yanf4j.core.impl.AbstractController 253- Add a session: 192.168.126.128:11211 22:20:18.963 [main] INFO bootstrap.MemcachedStandbyClientTest 24- set name=donald 22:20:18.973 [main] INFO bootstrap.MemcachedStandbyClientTest 27- delete name=null 22:20:18.978 [main] INFO bootstrap.MemcachedStandbyClientTest 32- set name=jamel 22:20:18.983 [main] INFO bootstrap.MemcachedStandbyClientTest 37- name=jamel 22:20:18.989 [main] INFO bootstrap.MemcachedStandbyClientTest 42- repalce name=rain 22:20:18.995 [main] INFO bootstrap.MemcachedStandbyClientTest 45- append name=rain-han 22:20:19.004 [main] INFO bootstrap.MemcachedStandbyClientTest 48- prepend name=0-rain-han 22:20:22.012 [main] INFO bootstrap.MemcachedStandbyClientTest 56- after touch name=null 22:20:22.017 [main] INFO bootstrap.MemcachedStandbyClientTest 59- age=27 22:20:22.026 [main] INFO bootstrap.MemcachedStandbyClientTest 62- incr age=30 22:20:22.031 [main] INFO bootstrap.MemcachedStandbyClientTest 64- decr age=28 22:20:22.043 [main] INFO bootstrap.MemcachedStandbyClientTest 68- cas age=27 22:20:22.050 [main] INFO bootstrap.MemcachedStandbyClientTest 71- incrementAndGet counter,1 22:20:22.053 [main] INFO bootstrap.MemcachedStandbyClientTest 72- decrementAndGet counter,0 22:20:22.055 [main] INFO bootstrap.MemcachedStandbyClientTest 73- addAndGet counter,3 22:20:22.089 [main] INFO com.google.code.yanf4j.core.impl.AbstractController 486- Controller has been stopped. 22:20:22.089 [Xmemcached-Reactor-2] INFO com.google.code.yanf4j.core.impl.AbstractController 368- Remove a session: 192.168.126.128:11211