Java 连接 Memcached 服务

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

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("w3cschool", 900, "Free Education");

             // 查看存储状态
             System.out.println("set status:" + fo.get());

             // 输出值
             System.out.println("w3cschool value in cache - " + mcc.get("w3cschool"));

             // 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
    W3Cschool 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("w3cschool", 900, "Free Education");

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

             // 输出
             System.out.println("w3cschool value in cache - " + mcc.get("w3cschool"));

             // 添加
             Future fo = mcc.add("w3cschool", 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("w3cschool", 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("w3cschool value in cache - " + mcc.get("w3cschool"));

             // 添加新的 key
             fo = mcc.replace("w3cschool", 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("w3cschool value in cache - " + mcc.get("w3cschool"));

             // 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("w3cschool", 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("w3cschool value in cache - " + mcc.get("w3cschool"));

             // 对存在的key进行数据添加操作
             Future fo = mcc.append("w3cschool", 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("w3cschool 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("w3cschool", 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("w3cschool value in cache - " + mcc.get("w3cschool"));

             // 对存在的key进行数据添加操作
             Future fo = mcc.prepend("w3cschool", 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("w3cschool 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("w3cschool", 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("w3cschool value in cache - " + mcc.get("w3cschool"));

             // 通过 gets 方法获取 CAS token(令牌)
             CASValue casValue = mcc.gets("w3cschool");

             // 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("w3cschool", 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("w3cschool value in cache - " + mcc.get("w3cschool"));

             // 关闭连接
             mcc.shutdown();

          }catch(Exception ex)
             System.out.println(ex.getMessage());
       }
    }

get 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("w3cschool", 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("w3cschool value in cache - " + mcc.get("w3cschool"));

             // 关闭连接
             mcc.shutdown();

          }catch(Exception ex)
             System.out.println(ex.getMessage());
       }
    }

gets 操作实例、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{

             // 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("w3cschool", 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 W3Cschool 的值
             System.out.println("w3cschool value in cache - " + mcc.get("w3cschool"));

             // 通过 gets 方法获取 CAS token(令牌)
             CASValue casValue = mcc.gets("w3cschool");

             // 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

    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("w3cschool", 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("w3cschool value in cache - " + mcc.get("w3cschool"));

             // 对存在的key进行数据添加操作
             Future fo = mcc.delete("w3cschool");

             // 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("w3cschool 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

    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());
       }
    }

作者:w3cschool 来源:https://www.w3cschool.cn

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