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      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。

      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。

      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 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

      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 sucessful.");
      
               // 存储数据
               Future fo = mcc.set("axihe", 900, "Free Education");
      
               // 查看存储状态
               System.out.println("set status:" + fo.get());
      
               // 输出值
               System.out.println("axihe value in cache - " + mcc.get("axihe"));
      
               // 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
      axihe 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 sucessful.");
      
               // 添加数据
               Future fo = mcc.set("axihe", 900, "Free Education");
      
               // 打印状态
               System.out.println("set status:" + fo.get());
      
               // 输出
               System.out.println("axihe value in cache - " + mcc.get("axihe"));
      
               // 添加
               fo = mcc.add("axihe", 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

      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 sucessful.");
      
               // 添加第一个 key=》value 对
               Future fo = mcc.set("axihe", 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("axihe value in cache - " + mcc.get("axihe"));
      
               // 添加新的 key
               fo = mcc.replace("axihe", 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("axihe value in cache - " + mcc.get("axihe"));
      
               // 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 sucessful.");
      
               // 添加数据
               Future fo = mcc.set("axihe", 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("axihe value in cache - " + mcc.get("axihe"));
      
               // 对存在的key进行数据添加操作
               fo = mcc.append("axihe", 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("axihe 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

      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 sucessful.");
      
               // 添加数据
               Future fo = mcc.set("axihe", 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("axihe value in cache - " + mcc.get("axihe"));
      
               // 对存在的key进行数据添加操作
               fo = mcc.prepend("axihe", 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("axihe 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

      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 sucessful.");
      
               // 添加数据
               Future fo = mcc.set("axihe", 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("axihe value in cache - " + mcc.get("axihe"));
      
               // 通过 gets 方法获取 CAS token(令牌)
               CASValue casValue = mcc.gets("axihe");
      
               // 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("axihe", 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("axihe value in cache - " + mcc.get("axihe"));
      
               // 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 sucessful.");
      
               // 添加数据
               Future fo = mcc.set("axihe", 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("axihe value in cache - " + mcc.get("axihe"));
      
               // 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 sucessful.");
      
               // 添加数据
               Future fo = mcc.set("axihe", 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 axihe 的值
               System.out.println("axihe value in cache - " + mcc.get("axihe"));
      
               // 通过 gets 方法获取 CAS token(令牌)
               CASValue casValue = mcc.gets("axihe");
      
               // 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 sucessful.");
      
               // 添加数据
               Future fo = mcc.set("axihe", 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("axihe value in cache - " + mcc.get("axihe"));
      
               // 对存在的key进行数据添加操作
              fo = mcc.delete("axihe");
      
               // 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("axihe value in cache - " + mcc.get("codingground"));
      
               // 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 sucessful.");
      
               // 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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