1. pom.xml文件增加:

<dependency>
          <groupId>com.whalin</groupId>
          <artifactId>Memcached-Java-Client</artifactId>
          <version>3.0.2</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-simple</artifactId>
        <version>1.6.2</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.6.2</version>
        </dependency>
        <dependency>
            <groupId>commons-pool</groupId>
            <artifactId>commons-pool</artifactId>
            <version>1.5.6</version>
        </dependency>

2. app-cache.xml配置

<bean id="memcachedPool" class="com.whalin.MemCached.SockIOPool" factory-method="getInstance" 
                                init-method="initialize" lazy-init="false" destroy-method="shutDown">
        <constructor-arg>
            <value>memcachedPool</value>
        </constructor-arg>
        <!-- 可以设置多个memcached服务器 -->
        <property name="servers">
            <list>
                <value>${memcache_ip}</value>
            </list>
        </property>
        <!-- 每个服务器初始连接数 -->
        <property name="initConn">
            <value>10</value>
        </property>
        <!-- 每个服务器最小连接数 -->
        <property name="minConn">
            <value>5</value>
        </property>
        <!-- 每个服务器最大连接数 -->
        <property name="maxConn">
            <value>250</value>
        </property>
        <!-- 主线程睡眠时间 -->
        <property name="maintSleep">
            <value>30</value>
        </property>
        <!-- TCP/Socket的参数,如果是true在写数据时不缓冲,立即发送出去参数 -->
        <property name="nagle">
            <value>false</value>
        </property>
        <!-- 连接超时/阻塞读取数据的超时间是 -->
        <property name="socketTO">
            <value>3000</value>
        </property>
    </bean>
    
    <bean id="memcachedClient" class="com.whalin.MemCached.MemCachedClient" >
        <constructor-arg>
            <value>memcachedPool</value>
        </constructor-arg>
    </bean>

3. 工具类MemcachedUtils

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.text.SimpleDateFormat;
import java.util.Date;

import org.apache.log4j.Logger;

import com.whalin.MemCached.MemCachedClient;

public class MemcachedUtils {
    private static final Logger logger = Logger.getLogger(MemcachedUtils.class);  
    private static MemCachedClient cachedClient;  
    static {  
        if (cachedClient == null)  
            cachedClient = new MemCachedClient("memcachedPool");  
    }  
  
    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 
     */  
    @SuppressWarnings("deprecation")
    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 + "] " + "- [" + new SimpleDateFormat("yyyy年-MM月-dd日 hh时:mm分:ss秒").format(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);  
            }  
        }  
    }  
}

4. app-config.xml(idc,dev,test,prd各自环境)

memcache_ip=192.168.1.10:11211

5. 使用

public class MemCacheController {
    private final Logger logger = LoggerFactory.getLogger(getClass());
    /**
     * 查找memcache中的key
     * @param key
     * @return
     */
    @RequestMapping(value = "/findSessionByKey", method = {RequestMethod.POST, RequestMethod.GET})
    @ResponseBody
    public String findByKey(@RequestParam String key){
        logger.info("MemCacheController.findByKey param:key="+key);
        if(StringUtils.isEmpty(key)){
            return "key must not be empty or null!";
        }
        return (String)MemcachedUtils.get(key);
    }
    
}

 参考文献

【1】http://www.cnblogs.com/xiaoqingxin/p/4132391.html

posted on 2015-12-21 17:45  一天不进步,就是退步  阅读(1187)  评论(0编辑  收藏  举报