Java 连接 Memcached 服务

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Java 连接 Memcached 服务

使用 Java 程序连接 Memcached，需要在你的 classpath 中添加 Memcached jar 包。

本站 jar 包下载地址：spymemcached-2.10.3.jar。Google Code jar 包下载地址：spymemcached-2.10.3.jar（需要翻墙）。

以下程序假定 Memcached 服务的主机为 127.0.0.1，端口为 11211。

连接实例

Java 连接 Memcached

import net.spy.memcached.MemcachedClient;
import java.net.*;public class MemcachedJava {   
public static void main(String[] args) {
      try{
         // 本地连接 Memcached 服务
         MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));
         System.out.println("Connection to server sucessful.");         
         // 关闭连接
         mcc.shutdown();         
      }catch(Exception ex){
         System.out.println( ex.getMessage() );
      }
   }
}

该程序中我们使用 InetSocketAddress 连接 IP 为 127.0.0.1 端口为 11211 的 memcached 服务。

执行以上代码，如果连接成功会输出以下信息：

Connection to server successful.

set 操作实例

以下使用 java.util.concurrent.Future 来存储数据

import java.net.InetSocketAddress;import java.util.concurrent.Future;import net.spy.memcached.MemcachedClient;public class MemcachedJava {   public static void main(String[] args) {        try{         // 连接本地的 Memcached 服务         MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));         System.out.println("Connection to server sucessful.");             // 存储数据         Future fo = mcc.set("runoob", 900, "Free Education");            // 查看存储状态         System.out.println("set status:" + fo.get());                 // 输出值         System.out.println("runoob value in cache - " + mcc.get("runoob"));         // 关闭连接         mcc.shutdown();            }catch(Exception ex){         System.out.println( ex.getMessage() );      }   }}

执行程序，输出结果为：

Connection to server successful.set status:truerunoob value in cache - Free Education

add 操作实例

import java.net.InetSocketAddress;import java.util.concurrent.Future;import net.spy.memcached.MemcachedClient;public class MemcachedJava {   public static void main(String[] args) {       try{          // 连接本地的 Memcached 服务         MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));         System.out.println("Connection to server sucessful.");         // 添加数据         Future fo = mcc.set("runoob", 900, "Free Education");         // 打印状态         System.out.println("set status:" + fo.get());         // 输出         System.out.println("runoob value in cache - " + mcc.get("runoob"));         // 添加         Future fo = mcc.add("runoob", 900, "memcached");         // 打印状态         System.out.println("add status:" + fo.get());         // 添加新key         fo = mcc.add("codingground", 900, "All Free Compilers");         // 打印状态         System.out.println("add status:" + fo.get());                // 输出         System.out.println("codingground value in cache - " + mcc.get("codingground"));         // 关闭连接         mcc.shutdown();              }catch(Exception ex){         System.out.println(ex.getMessage());      }   }}

replace 操作实例

import java.net.InetSocketAddress;import java.util.concurrent.Future;import net.spy.memcached.MemcachedClient;public class MemcachedJava {   public static void main(String[] args) {         try {         //连接本地的 Memcached 服务         MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));         System.out.println("Connection to server sucessful.");         // 添加第一个 key=》value 对         Future fo = mcc.set("runoob", 900, "Free Education");         // 输出执行 add 方法后的状态         System.out.println("add status:" + fo.get());         // 获取键对应的值         System.out.println("runoob value in cache - " + mcc.get("runoob"));         // 添加新的 key         fo = mcc.replace("runoob", 900, "Largest Tutorials' Library");         // 输出执行 set 方法后的状态         System.out.println("replace status:" + fo.get());         // 获取键对应的值         System.out.println("runoob value in cache - " + mcc.get("runoob"));         // 关闭连接         mcc.shutdown();               }catch(Exception ex){         System.out.println( ex.getMessage() );      }   }}

append 操作实例

import java.net.InetSocketAddress;import java.util.concurrent.Future;import net.spy.memcached.MemcachedClient;public class MemcachedJava {   public static void main(String[] args) {         try{         // 连接本地的 Memcached 服务         MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));         System.out.println("Connection to server sucessful.");         // 添加数据         Future fo = mcc.set("runoob", 900, "Free Education");         // 输出执行 set 方法后的状态         System.out.println("set status:" + fo.get());         // 获取键对应的值         System.out.println("runoob value in cache - " + mcc.get("runoob"));         // 对存在的key进行数据添加操作         Future fo = mcc.append("runoob", 900, " for All");         // 输出执行 set 方法后的状态         System.out.println("append status:" + fo.get());         // 获取键对应的值         System.out.println("runoob value in cache - " + mcc.get("codingground"));         // 关闭连接         mcc.shutdown();               }catch(Exception ex)         System.out.println(ex.getMessage());   }}

prepend 操作实例

import java.net.InetSocketAddress;import java.util.concurrent.Future;import net.spy.memcached.MemcachedClient;public class MemcachedJava {   public static void main(String[] args) {      try{         // 连接本地的 Memcached 服务         MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));         System.out.println("Connection to server sucessful.");         // 添加数据         Future fo = mcc.set("runoob", 900, "Education for All");         // 输出执行 set 方法后的状态         System.out.println("set status:" + fo.get());         // 获取键对应的值         System.out.println("runoob value in cache - " + mcc.get("runoob"));         // 对存在的key进行数据添加操作         Future fo = mcc.prepend("runoob", 900, "Free ");         // 输出执行 set 方法后的状态         System.out.println("prepend status:" + fo.get());         // 获取键对应的值         System.out.println("runoob value in cache - " + mcc.get("codingground"));         // 关闭连接         mcc.shutdown();      }catch(Exception ex)         System.out.println(ex.getMessage());   }}

CAS 操作实例

import java.net.InetSocketAddress;import java.util.concurrent.Future;import net.spy.memcached.CASValue;import net.spy.memcached.CASResponse;import net.spy.memcached.MemcachedClient;public class MemcachedJava {   public static void main(String[] args) {        try{            // 连接本地的 Memcached 服务         MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));         System.out.println("Connection to server sucessful.");         // 添加数据         Future fo = mcc.set("runoob", 900, "Free Education");         // 输出执行 set 方法后的状态         System.out.println("set status:" + fo.get());                    // 使用 get 方法获取数据         System.out.println("runoob value in cache - " + mcc.get("runoob"));         // 通过 gets 方法获取 CAS token（令牌）         CASValue casValue = mcc.gets("runoob");         // 输出 CAS token（令牌） 值         System.out.println("CAS token - " + casValue);         // 尝试使用cas方法来更新数据         CASResponse casresp = mcc.cas("runoob", casValue.getCas(), 900, "Largest Tutorials-Library");               // 输出 CAS 响应信息         System.out.println("CAS Response - " + casresp);         // 输出值         System.out.println("runoob value in cache - " + mcc.get("runoob"));         // 关闭连接         mcc.shutdown();               }catch(Exception ex)         System.out.println(ex.getMessage());   }}

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