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（需要科学上网）。

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

1. 连接范例

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.

 
2. set 操作范例
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("codebaoku", 900, "Free Education");
      
         // 查看存储状态
         System.out.println("set status:" + fo.get());
         
         // 输出值
         System.out.println("codebaoku value in cache - " + mcc.get("codebaoku"));
 
         // 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
codebaoku value in cache - Free Education

 
3. add 操作范例

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


 
4. replace 操作范例

 
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("codebaoku", 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("codebaoku value in cache - " + mcc.get("codebaoku"));
 
         // 添加新的 key
         fo = mcc.replace("codebaoku", 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("codebaoku value in cache - " + mcc.get("codebaoku"));
 
         // 关闭连接
         mcc.shutdown();
         
      }catch(Exception ex){
         System.out.println( ex.getMessage() );
      }
   }
}


 
5. append 操作范例

 
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("codebaoku", 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("codebaoku value in cache - " + mcc.get("codebaoku"));
 
         // 对存在的key进行数据添加操作
         fo = mcc.append("codebaoku", 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("codebaoku value in cache - " + mcc.get("codebaoku"));
 
         // 关闭连接
         mcc.shutdown();
         
      }catch(Exception ex) {
         System.out.println(ex.getMessage());
      ]
   }
}


 
6. prepend 操作范例

 
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("codebaoku", 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("codebaoku value in cache - " + mcc.get("codebaoku"));
 
         // 对存在的key进行数据添加操作
         fo = mcc.prepend("codebaoku", 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("codebaoku value in cache - " + mcc.get("codebaoku"));
 
         // 关闭连接
         mcc.shutdown();
         
      }catch(Exception ex) {
         System.out.println(ex.getMessage());
      }
   }
}


 
7. CAS 操作范例

 
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("codebaoku", 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("codebaoku value in cache - " + mcc.get("codebaoku"));
 
         // 通过 gets 方法获取 CAS token（令牌）
         CASValue casValue = mcc.gets("codebaoku");
 
         // 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("codebaoku", 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("codebaoku value in cache - " + mcc.get("codebaoku"));
 
         // 关闭连接
         mcc.shutdown();
         
      }catch(Exception ex) {
         System.out.println(ex.getMessage());
      }
   }
}

 
8. get 操作范例

 
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("codebaoku", 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("codebaoku value in cache - " + mcc.get("codebaoku"));
 
         // 关闭连接
         mcc.shutdown();
         
      }catch(Exception ex) {
         System.out.println(ex.getMessage());
      }
   }
}


 
9. gets 操作范例、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("codebaoku", 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 codebaoku 的值
         System.out.println("codebaoku value in cache - " + mcc.get("codebaoku"));
 
         // 通过 gets 方法获取 CAS token（令牌）
         CASValue casValue = mcc.gets("codebaoku");
 
         // 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());
      }
   }
}


 
10. delete 操作范例

 
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("codebaoku", 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("codebaoku value in cache - " + mcc.get("codebaoku"));
 
         // 对存在的key进行数据添加操作
        fo = mcc.delete("codebaoku");
 
         // 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("codebaoku value in cache - " + mcc.get("codebaoku"));
 
         // 关闭连接
         mcc.shutdown();
         
      }catch(Exception ex) {
         System.out.println(ex.getMessage());
      }
   }
}


 
11. Incr/Decr 操作范例

 
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());
      }
   }
}
                        
                        
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