Java 连接 Memcached 服务

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。

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

## MemcachedJava.java 文件：

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 successful.");                  // 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

## MemcachedJava.java 文件：

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 successful.");               // 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:true
runoob value in cache - Free Education

add 操作实例

## MemcachedJava.java 文件：

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 successful.");          // 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         fo = mcc.add("runoob", 900, "memcached");          // 打印状态         System.out.println("add status:" + fo.get());          // 添加新key         fo = mcc.add("runoob", 900, "All Free Compilers");          // 打印状态         System.out.println("add status:" + fo.get());                  // 输出         System.out.println("runoob value in cache - " + mcc.get("runoob"));          // 关闭连接         mcc.shutdown();               }catch(Exception ex){         System.out.println(ex.getMessage());      }   } }

replace 操作实例

## MemcachedJava.java 文件：

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 successful.");          // 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

## MemcachedJava.java 文件：

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 successful.");          // 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         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("runoob"));          // 关闭连接         mcc.shutdown();               }catch(Exception ex) {         System.out.println(ex.getMessage());      ]   } }

prepend 操作实例

## MemcachedJava.java 文件：

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 successful.");          // 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         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("runoob"));          // 关闭连接         mcc.shutdown();               }catch(Exception ex) {         System.out.println(ex.getMessage());      }   } }

CAS 操作实例

## MemcachedJava.java 文件：

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 successful.");          // 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());      }   } }

get 操作实例

## MemcachedJava.java 文件：

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 successful.");          // 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"));          // 关闭连接         mcc.shutdown();               }catch(Exception ex) {         System.out.println(ex.getMessage());      }   } }

gets 操作实例、CAS

## MemcachedJava.java 文件：

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 successful.");          // 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());                     // 从缓存中获取键为 runoob 的值         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 value in cache - " + casValue);          // 关闭连接         mcc.shutdown();               }catch(Exception ex) {         System.out.println(ex.getMessage());      }   } }

delete 操作实例

## MemcachedJava.java 文件：

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 successful.");          // 添加数据         Future fo = mcc.set("runoob", 900, "World's largest online tutorials library");          // 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        fo = mcc.delete("runoob");          // 输出执行 delete 方法后的状态         System.out.println("delete 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());      }   } }

Incr/Decr 操作实例

## MemcachedJava.java 文件：

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 successful.");          // 添加数字值         Future fo = mcc.set("number", 900, "1000");          // 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("value in cache - " + mcc.get("number"));          // 自增并输出         System.out.println("value in cache after increment - " + mcc.incr("number", 111));          // 自减并输出         System.out.println("value in cache after decrement - " + mcc.decr("number", 112));          // 关闭连接         mcc.shutdown();               }catch(Exception ex) {         System.out.println(ex.getMessage());      }   } }