java連接memcached

使用 Java 程序連接 Memcached，需要在你的 classpath 中添加 Memcached jar 包。

點擊下載：spymemcached-2.10.3.jar

以下程序假定 Memcached 服務的主機爲 127.0.0.1，端口爲 11211。

連接實例

Java 連接 Memcached

import net.spy.memcached.MemcachedClient;
import java.net.*;


public class MemcachedJava {
   public static void main(String[] args) {
      try{
         // 本地連接 Memcached 服務
         MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));
         System.out.println("Connection to server sucessful.");
         
         // 關閉連接
         mcc.shutdown();
         
      }catch(Exception ex){
         System.out.println( ex.getMessage() );
      }
   }
}

該程序中我們使用 InetSocketAddress 連接 IP 爲 127.0.0.1 端口 爲 11211 的 memcached 服務。

執行以上代碼，如果連接成功會輸出以下信息：

Connection to server successful.

set 操作實例

以下使用 java.util.concurrent.Future 來存儲數據

import java.net.InetSocketAddress;
import java.util.concurrent.Future;

import net.spy.memcached.MemcachedClient;

public class MemcachedJava {
   public static void main(String[] args) {
   
      try{
         // 連接本地的 Memcached 服務
         MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));
         System.out.println("Connection to server sucessful.");
      
         // 存儲數據
         Future fo = mcc.set("runoob", 900, "Free Education");
      
         // 查看存儲狀態
         System.out.println("set status:" + fo.get());
         
         // 輸出值
         System.out.println("runoob value in cache - " + mcc.get("runoob"));

         // 關閉連接
         mcc.shutdown();
         
      }catch(Exception ex){
         System.out.println( ex.getMessage() );
      }
   }
}

執行程序，輸出結果爲：

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

add 操作實例

import java.net.InetSocketAddress;
import java.util.concurrent.Future;

import net.spy.memcached.MemcachedClient;

public class MemcachedJava {
   public static void main(String[] args) {
   
      try{
   
         // 連接本地的 Memcached 服務
         MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));
         System.out.println("Connection to server sucessful.");

         // 添加數據
         Future fo = mcc.set("runoob", 900, "Free Education");

         // 打印狀態
         System.out.println("set status:" + fo.get());

         // 輸出
         System.out.println("runoob value in cache - " + mcc.get("runoob"));

         // 添加
         Future fo = mcc.add("runoob", 900, "memcached");

         // 打印狀態
         System.out.println("add status:" + fo.get());

         // 添加新key
         fo = mcc.add("codingground", 900, "All Free Compilers");

         // 打印狀態
         System.out.println("add status:" + fo.get());
         
         // 輸出
         System.out.println("codingground value in cache - " + mcc.get("codingground"));

         // 關閉連接
         mcc.shutdown();
         
      }catch(Exception ex){
         System.out.println(ex.getMessage());
      }
   }
}

replace 操作實例

import java.net.InetSocketAddress;
import java.util.concurrent.Future;

import net.spy.memcached.MemcachedClient;

public class MemcachedJava {
   public static void main(String[] args) {
   
      try {
         //連接本地的 Memcached 服務
         MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));
         System.out.println("Connection to server sucessful.");

         // 添加第一個 key=》value 對
         Future fo = mcc.set("runoob", 900, "Free Education");

         // 輸出執行 add 方法後的狀態
         System.out.println("add status:" + fo.get());

         // 獲取鍵對應的值
         System.out.println("runoob value in cache - " + mcc.get("runoob"));

         // 添加新的 key
         fo = mcc.replace("runoob", 900, "Largest Tutorials' Library");

         // 輸出執行 set 方法後的狀態
         System.out.println("replace status:" + fo.get());

         // 獲取鍵對應的值
         System.out.println("runoob value in cache - " + mcc.get("runoob"));

         // 關閉連接
         mcc.shutdown();
         
      }catch(Exception ex){
         System.out.println( ex.getMessage() );
      }
   }
}

append 操作實例

import java.net.InetSocketAddress;
import java.util.concurrent.Future;

import net.spy.memcached.MemcachedClient;

public class MemcachedJava {
   public static void main(String[] args) {
   
      try{
   
         // 連接本地的 Memcached 服務
         MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));
         System.out.println("Connection to server sucessful.");

         // 添加數據
         Future fo = mcc.set("runoob", 900, "Free Education");

         // 輸出執行 set 方法後的狀態
         System.out.println("set status:" + fo.get());

         // 獲取鍵對應的值
         System.out.println("runoob value in cache - " + mcc.get("runoob"));

         // 對存在的key進行數據添加操作
         Future fo = mcc.append("runoob", 900, " for All");

         // 輸出執行 set 方法後的狀態
         System.out.println("append status:" + fo.get());
         
         // 獲取鍵對應的值
         System.out.println("runoob value in cache - " + mcc.get("codingground"));

         // 關閉連接
         mcc.shutdown();
         
      }catch(Exception ex)
         System.out.println(ex.getMessage());
   }
}

prepend操作實例

import java.net.InetSocketAddress;
import java.util.concurrent.Future;

import net.spy.memcached.MemcachedClient;

public class MemcachedJava {
   public static void main(String[] args) {
   
      try{
   
         // 連接本地的 Memcached 服務
         MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));
         System.out.println("Connection to server sucessful.");

         // 添加數據
         Future fo = mcc.set("runoob", 900, "Education for All");

         // 輸出執行 set 方法後的狀態
         System.out.println("set status:" + fo.get());

         // 獲取鍵對應的值
         System.out.println("runoob value in cache - " + mcc.get("runoob"));

         // 對存在的key進行數據添加操作
         Future fo = mcc.prepend("runoob", 900, "Free ");

         // 輸出執行 set 方法後的狀態
         System.out.println("prepend status:" + fo.get());
         
         // 獲取鍵對應的值
         System.out.println("runoob value in cache - " + mcc.get("codingground"));

         // 關閉連接
         mcc.shutdown();
         
      }catch(Exception ex)
         System.out.println(ex.getMessage());
   }
}

CAS 操作實例

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{
   
         // 連接本地的 Memcached 服務
         MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));
         System.out.println("Connection to server sucessful.");

         // 添加數據
         Future fo = mcc.set("runoob", 900, "Free Education");

         // 輸出執行 set 方法後的狀態
         System.out.println("set status:" + fo.get());
            
         // 使用 get 方法獲取數據
         System.out.println("runoob value in cache - " + mcc.get("runoob"));

         // 通過 gets 方法獲取 CAS token（令牌）
         CASValue casValue = mcc.gets("runoob");

         // 輸出 CAS token（令牌） 值
         System.out.println("CAS token - " + casValue);

         // 嘗試使用cas方法來更新數據
         CASResponse casresp = mcc.cas("runoob", casValue.getCas(), 900, "Largest Tutorials-Library");
         
         // 輸出 CAS 響應信息
         System.out.println("CAS Response - " + casresp);

         // 輸出值
         System.out.println("runoob value in cache - " + mcc.get("runoob"));

         // 關閉連接
         mcc.shutdown();
         
      }catch(Exception ex)
         System.out.println(ex.getMessage());
   }
}

get操作實例

import java.net.InetSocketAddress;
import java.util.concurrent.Future;

import net.spy.memcached.MemcachedClient;

public class MemcachedJava {
   public static void main(String[] args) {
   
      try{
   
         // 連接本地的 Memcached 服務
         MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));
         System.out.println("Connection to server sucessful.");

         // 添加數據
         Future fo = mcc.set("runoob", 900, "Free Education");

         // 輸出執行 set 方法後的狀態
         System.out.println("set status:" + fo.get());

         // 使用 get 方法獲取數據
         System.out.println("runoob value in cache - " + mcc.get("runoob"));

         // 關閉連接
         mcc.shutdown();
         
      }catch(Exception ex)
         System.out.println(ex.getMessage());
   }
}

gets 操作實例、CAS

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{
   
         // 連接本地的 Memcached 服務
         MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));
         System.out.println("Connection to server sucessful.");

         // 添加數據
         Future fo = mcc.set("runoob", 900, "Free Education");

         // 輸出執行 set 方法後的狀態
         System.out.println("set status:" + fo.get());
            
         // 從緩存中獲取鍵爲 runoob 的值
         System.out.println("runoob value in cache - " + mcc.get("runoob"));

         // 通過 gets 方法獲取 CAS token（令牌）
         CASValue casValue = mcc.gets("runoob");

         // 輸出 CAS token（令牌） 值
         System.out.println("CAS value in cache - " + casValue);

         // 關閉連接
         mcc.shutdown();
         
      }catch(Exception ex)
         System.out.println(ex.getMessage());
   }
}

delete操作實例

import java.net.InetSocketAddress;
import java.util.concurrent.Future;

import net.spy.memcached.MemcachedClient;

public class MemcachedJava {
   public static void main(String[] args) {
   
      try{
   
         // 連接本地的 Memcached 服務
         MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));
         System.out.println("Connection to server sucessful.");

         // 添加數據
         Future fo = mcc.set("runoob", 900, "World's largest online tutorials library");

         // 輸出執行 set 方法後的狀態
         System.out.println("set status:" + fo.get());

         // 獲取鍵對應的值
         System.out.println("runoob value in cache - " + mcc.get("runoob"));

         // 對存在的key進行數據添加操作
         Future fo = mcc.delete("runoob");

         // 輸出執行 delete 方法後的狀態
         System.out.println("delete status:" + fo.get());

         // 獲取鍵對應的值
         System.out.println("runoob value in cache - " + mcc.get("codingground"));

         // 關閉連接
         mcc.shutdown();
         
      }catch(Exception ex)
         System.out.println(ex.getMessage());
   }
}

Incr/Decr操作實例

import java.net.InetSocketAddress;
import java.util.concurrent.Future;

import net.spy.memcached.MemcachedClient;

public class MemcachedJava {
   public static void main(String[] args) {
   
      try{
   
         // 連接本地的 Memcached 服務
         MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));
         System.out.println("Connection to server sucessful.");

         // 添加數字值
         Future fo = mcc.set("number", 900, "1000");

         // 輸出執行 set 方法後的狀態
         System.out.println("set status:" + fo.get());

         // 獲取鍵對應的值
         System.out.println("value in cache - " + mcc.get("number"));

         // 自增並輸出
         System.out.println("value in cache after increment - " + mcc.incr("number", 111));

         // 自減並輸出
         System.out.println("value in cache after decrement - " + mcc.decr("number", 112));

         // 關閉連接
         mcc.shutdown();
         
      }catch(Exception ex)
         System.out.println(ex.getMessage());
   }
}