java连接memcached

一时失言乱红尘 2022-06-14 11:26 130阅读 0赞

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

点击下载：[spymemcached-2.10.3.jar  
][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

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

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 ##

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("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
             Future fo = mcc.add("runoob", 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("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 ##

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("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
             Future 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("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("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
             Future 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("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("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 ##

## 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("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 ##

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("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
             Future 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("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());
       }
    }

[spymemcached-2.10.3.jar]: http://www.runoob.com/try/download/spymemcached-2.10.3.jar