Memcached客户端（memcached-Java-client）与 Spring集成（单服务器）

Memcached客户端与Spring集成，客户端使用的是Memcached-Java-Client-release_2.6.3

1. 配置Maven

<!-- Memcached client -->
<dependency> 
	<groupId>com.danga</groupId>
	<artifactId>memcached-java-client</artifactId>
	<version>2.6.3</version>
</dependency>

2. Properties配置

#######################Memcached配置#######################
#服务器地址
memcached.server=127.0.0.1:11211
#初始化时对每个服务器建立的连接数目
memcached.initConn=20
#每个服务器建立最小的连接数
memcached.minConn=10
#每个服务器建立最大的连接数
memcached.maxConn=50
#自查线程周期进行工作，其每次休眠时间
memcached.maintSleep=3000
#Socket的参数，如果是true在写数据时不缓冲，立即发送出去
memcached.nagle=false
#Socket阻塞读取数据的超时时间
memcached.socketTO=3000

3. Spring配置

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:aop="http://www.springframework.org/schema/aop"
	xmlns:util="http://www.springframework.org/schema/util" 
	xmlns:mvc="http://www.springframework.org/schema/mvc"
	xmlns:tx="http://www.springframework.org/schema/tx"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
           http://www.springframework.org/schema/aop 
           http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context-3.0.xsd
           http://www.springframework.org/schema/util 
           http://www.springframework.org/schema/util/spring-util-3.1.xsd
           http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
           http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">
	
	<!-- properties config   -->
    <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
      <property name="order" value="1"/>
      <property name="ignoreUnresolvablePlaceholders" value="true"/>
      <property name="locations">
      	<list>
			<value>classpath:config/memcached.properties</value>
      	</list>
      </property>
    </bean>
    
	<!-- Memcached配置 -->
    <bean id="memcachedPool" class="com.danga.MemCached.SockIOPool"
		factory-method="getInstance" init-method="initialize" destroy-method="shutDown">
		<property name="servers">
			<list>
				<value>${memcached.server}</value>
			</list>
		</property>
		<property name="initConn">
			<value>${memcached.initConn}</value>
		</property>
		<property name="minConn">
			<value>${memcached.minConn}</value>
		</property>
		<property name="maxConn">
			<value>${memcached.maxConn}</value>
		</property>
		<property name="maintSleep">
			<value>${memcached.maintSleep}</value>
		</property>
		<property name="nagle">
			<value>${memcached.nagle}</value>
		</property>
		<property name="socketTO">
			<value>${memcached.socketTO}</value>
		</property>
	</bean>
</beans>

4. Memcached工具类

package com.wyy.snail.core.util;

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.lang.management.ManagementFactory;
import java.lang.management.RuntimeMXBean;
import java.util.Date;

import org.apache.log4j.Logger;

import com.danga.MemCached.MemCachedClient;
import com.snail.base.utils.DateUtils;

/**
 * 
 * @ClassName: MemcachedUtils
 * @Description: Memcached工具类
 * @author yinjw
 * @date 2014-6-18 下午5:28:08
 * 
 */
public class MemcachedUtils {
	private static final Logger logger = Logger.getLogger(MemcachedUtils.class);
	private static MemCachedClient cachedClient;
	static {
		if (cachedClient == null)
			cachedClient = new MemCachedClient();
	}

	private MemcachedUtils() {
	}

	/**
	 * 向缓存添加新的键值对。如果键已经存在，则之前的值将被替换。
	 * 
	 * @param key
	 *            键
	 * @param value
	 *            值
	 * @return
	 */
	public static boolean set(String key, Object value) {
		return setExp(key, value, null);
	}

	/**
	 * 向缓存添加新的键值对。如果键已经存在，则之前的值将被替换。
	 * 
	 * @param key
	 *            键
	 * @param value
	 *            值
	 * @param expire
	 *            过期时间 New Date(1000*10)：十秒后过期
	 * @return
	 */
	public static boolean set(String key, Object value, Date expire) {
		return setExp(key, value, expire);
	}

	/**
	 * 向缓存添加新的键值对。如果键已经存在，则之前的值将被替换。
	 * 
	 * @param key
	 *            键
	 * @param value
	 *            值
	 * @param expire
	 *            过期时间 New Date(1000*10)：十秒后过期
	 * @return
	 */
	private static boolean setExp(String key, Object value, Date expire) {
		boolean flag = false;
		try {
			flag = cachedClient.set(key, value, expire);
		} catch (Exception e) {
			// 记录Memcached日志
			MemcachedLog.writeLog("Memcached set方法报错，key值：" + key + "\r\n" + exceptionWrite(e));
		}
		return flag;
	}

	/**
	 * 仅当缓存中不存在键时，add 命令才会向缓存中添加一个键值对。
	 * 
	 * @param key
	 *            键
	 * @param value
	 *            值
	 * @return
	 */
	public static boolean add(String key, Object value) {
		return addExp(key, value, null);
	}

	/**
	 * 仅当缓存中不存在键时，add 命令才会向缓存中添加一个键值对。
	 * 
	 * @param key
	 *            键
	 * @param value
	 *            值
	 * @param expire
	 *            过期时间 New Date(1000*10)：十秒后过期
	 * @return
	 */
	public static boolean add(String key, Object value, Date expire) {
		return addExp(key, value, expire);
	}

	/**
	 * 仅当缓存中不存在键时，add 命令才会向缓存中添加一个键值对。
	 * 
	 * @param key
	 *            键
	 * @param value
	 *            值
	 * @param expire
	 *            过期时间 New Date(1000*10)：十秒后过期
	 * @return
	 */
	private static boolean addExp(String key, Object value, Date expire) {
		boolean flag = false;
		try {
			flag = cachedClient.add(key, value, expire);
		} catch (Exception e) {
			// 记录Memcached日志
			MemcachedLog.writeLog("Memcached add方法报错，key值：" + key + "\r\n" + exceptionWrite(e));
		}
		return flag;
	}

	/**
	 * 仅当键已经存在时，replace 命令才会替换缓存中的键。
	 * 
	 * @param key
	 *            键
	 * @param value
	 *            值
	 * @return
	 */
	public static boolean replace(String key, Object value) {
		return replaceExp(key, value, null);
	}

	/**
	 * 仅当键已经存在时，replace 命令才会替换缓存中的键。
	 * 
	 * @param key
	 *            键
	 * @param value
	 *            值
	 * @param expire
	 *            过期时间 New Date(1000*10)：十秒后过期
	 * @return
	 */
	public static boolean replace(String key, Object value, Date expire) {
		return replaceExp(key, value, expire);
	}

	/**
	 * 仅当键已经存在时，replace 命令才会替换缓存中的键。
	 * 
	 * @param key
	 *            键
	 * @param value
	 *            值
	 * @param expire
	 *            过期时间 New Date(1000*10)：十秒后过期
	 * @return
	 */
	private static boolean replaceExp(String key, Object value, Date expire) {
		boolean flag = false;
		try {
			flag = cachedClient.replace(key, value, expire);
		} catch (Exception e) {
			MemcachedLog.writeLog("Memcached replace方法报错，key值：" + key + "\r\n" + exceptionWrite(e));
		}
		return flag;
	}

	/**
	 * get 命令用于检索与之前添加的键值对相关的值。
	 * 
	 * @param key
	 *            键
	 * @return
	 */
	public static Object get(String key) {
		Object obj = null;
		try {
			obj = cachedClient.get(key);
		} catch (Exception e) {
			MemcachedLog.writeLog("Memcached get方法报错，key值：" + key + "\r\n" + exceptionWrite(e));
		}
		return obj;
	}

	/**
	 * 删除 memcached 中的任何现有值。
	 * 
	 * @param key
	 *            键
	 * @return
	 */
	public static boolean delete(String key) {
		return deleteExp(key, null);
	}

	/**
	 * 删除 memcached 中的任何现有值。
	 * 
	 * @param key
	 *            键
	 * @param expire
	 *            过期时间 New Date(1000*10)：十秒后过期
	 * @return
	 */
	public static boolean delete(String key, Date expire) {
		return deleteExp(key, expire);
	}

	/**
	 * 删除 memcached 中的任何现有值。
	 * 
	 * @param key
	 *            键
	 * @param expire
	 *            过期时间 New Date(1000*10)：十秒后过期
	 * @return
	 */
	private static boolean deleteExp(String key, Date expire) {
		boolean flag = false;
		try {
			flag = cachedClient.delete(key, expire);
		} catch (Exception e) {
			MemcachedLog.writeLog("Memcached delete方法报错，key值：" + key + "\r\n" + exceptionWrite(e));
		}
		return flag;
	}

	/**
	 * 清理缓存中的所有键/值对
	 * 
	 * @return
	 */
	public static boolean flashAll() {
		boolean flag = false;
		try {
			flag = cachedClient.flushAll();
		} catch (Exception e) {
			MemcachedLog.writeLog("Memcached flashAll方法报错\r\n" + exceptionWrite(e));
		}
		return flag;
	}

	/**
	 * 返回异常栈信息，String类型
	 * 
	 * @param e
	 * @return
	 */
	private static String exceptionWrite(Exception e) {
		StringWriter sw = new StringWriter();
		PrintWriter pw = new PrintWriter(sw);
		e.printStackTrace(pw);
		pw.flush();
		return sw.toString();
	}

	/**
	 * 
	 * @ClassName: MemcachedLog
	 * @Description: Memcached日志记录
	 * @author yinjw
	 * @date 2014-6-18 下午5:01:37
	 * 
	 */
	private static class MemcachedLog {
		private final static String MEMCACHED_LOG = "D:\\memcached.log";
		private final static String LINUX_MEMCACHED_LOG = "/usr/local/logs/memcached.log";
		private static FileWriter fileWriter;
		private static BufferedWriter logWrite;
		// 获取PID，可以找到对应的JVM进程
		private final static RuntimeMXBean runtime = ManagementFactory.getRuntimeMXBean();
		private final static String PID = runtime.getName();

		/**
		 * 初始化写入流
		 */
		static {
			try {
				String osName = System.getProperty("os.name");
				if (osName.indexOf("Windows") == -1) {
					fileWriter = new FileWriter(MEMCACHED_LOG, true);
				} else {
					fileWriter = new FileWriter(LINUX_MEMCACHED_LOG, true);
				}
				logWrite = new BufferedWriter(fileWriter);
			} catch (IOException e) {
				logger.error("memcached 日志初始化失败", e);
				closeLogStream();
			}
		}

		/**
		 * 写入日志信息
		 * 
		 * @param content
		 *            日志内容
		 */
		public static void writeLog(String content) {
			try {
				logWrite.write("[" + PID + "] " + "- [" + DateUtils.formateTime(new Date().getTime()) + "]\r\n"
						+ content);
				logWrite.newLine();
				logWrite.flush();
			} catch (IOException e) {
				logger.error("memcached 写入日志信息失败", e);
			}
		}

		/**
		 * 关闭流
		 */
		private static void closeLogStream() {
			try {
				fileWriter.close();
				logWrite.close();
			} catch (IOException e) {
				logger.error("memcached 日志对象关闭失败", e);
			}
		}
	}
}

5. 使用工具类操作Memcached

@Test
public void testMemcachedSpring() {
	MemcachedUtils.set("aa", "bb", new Date(1000 * 60));
	Object obj = MemcachedUtils.get("aa");
	System.out.println("***************************");
	System.out.println(obj.toString());
}