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实战Memcached缓存系统(1)Memcached基础及示例程序

1. What is Memcached?
Memcached是一个免费开源、高性能、分布式的内存对象缓存系统。Memcached是在内存中,为特定数据(字符串或对象)构建key-value的小块数据存储。
 
2. 下载Memcached的服务器端软件
Windows平台版本下载:http://splinedancer.com/memcached-win32/memcached-1.2.4-Win32-Preview-20080309_bin.zip
Linux平台版本下载:http://memcached.googlecode.com/files/memcached-1.4.10.tar.gz
 
3. 在服务器上部署Memcached Server
以下以Windows平台为例:
参考:http://www.codeforest.net/how-to-install-memcached-on-windows-machine
下载下来的Windows版本解压到C:/memcached/
在控制台输入命令安装:
[plain]
c:/memcached/memcached.exe  -d install 
 
启动:
[plain]
c:/memcached/memcached.exe -d  start 
 
或:
[plain]
net start "memcached Server" 
 
默认的缓存大小为64M,如果不够用,请打开注册表,找到:
[plain]
HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services/memcached  Server . 
 
将其内容修改为:
[plain]
“C:/memcached/memcached.exe” -d runservice -m 512 
 
 
4. 下载Memcached的客户端API包
下载地址:http://spymemcached.googlecode.com/files/memcached-2.5.jar
 
5. 编写一个Java数据类
[java]
package com.sinosuperman.memcached; 
 
import java.io.Serializable; 
 
 
public class User implements Serializable{  
 
    private static final long serialVersionUID = -372274003834027815L; 
 
    String userId; 
     
    public User(String userId) {  
        super();  
        this.userId = userId;  
    } 
     
    public String getUserId() {  
        return userId;  
    }  
     
    public void setUserId(String userId) {  
        this.userId = userId;  
    }  
         
    @Override  
    public String toString() {  
        // TODO Auto-generated method stub  
        StringBuffer sb=new StringBuffer();  
        sb.append("userId="+this.userId);  
        return sb.toString();  
    }  
}  
 
 
6. 编写一个Memcached的客户端
[java]
package com.sinosuperman.memcached; 
 
import java.io.IOException; 
import java.net.InetSocketAddress; 
 
import net.spy.memcached.MemcachedClient; 
 
public class TestMemcached { 
    public static void main(String[] args) throws IOException { 
        MemcachedClient cache = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211)); 
        for (int i = 1; i < 10; i++) { 
            cache.set("T0001" + i, 3600, new User(i + ""));  
        } 
        User myObject = (User) cache.get("T00011"); 
        System.out.println("Get object from mem :" + myObject);  
    }  

 
7. 运行测试
运行结果应该如下:
[java]
2011-12-15 17:25:30.276 INFO net.spy.memcached.MemcachedConnection:  Added {QA sa=/127.0.0.1:11211, #Rops=0, #Wops=0, #iq=0, topRop=null, topWop=null, toWrite=0, interested=0} to connect queue 
2011-12-15 17:25:30.292 INFO net.spy.memcached.MemcachedConnection:  Connection state changed for sun.nio.ch.SelectionKeyImpl@c62080 
Get object from mem :userId=1 
 
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