Memcached使用入门——（1）Memcached基础及示例程序

winston

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/memcache ... ew-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：
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• c:/memcached/memcached.exe  -d install  

c:/memcached/memcached.exe  -d install
启动：

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• c:/memcached/memcached.exe -d  start  

c:/memcached/memcached.exe -d  start
或：

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• net start "memcached Server"  

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：

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• HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services/memcached  Server .  

HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services/memcached  Server .
将其内容修改为：

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• “C:/memcached/memcached.exe” -d runservice -m 512  

“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
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3. package com.sinosuperman.memcached;  
4.   
5. import java.io.Serializable;  
6.   
7.   
8. public class User implements Serializable{   
9.   
10.     private static final long serialVersionUID = -372274003834027815L;  
11.   
12.     String userId;  
13.       
14.     public User(String userId) {   
15.         super();   
16.         this.userId = userId;   
17.     }  
18.       
19.     public String getUserId() {   
20.         return userId;   
21.     }   
22.       
23.     public void setUserId(String userId) {   
24.         this.userId = userId;   
25.     }   
26.          
27.     @Override   
28.     public String toString() {   
29.         // TODO Auto-generated method stub  
30.   
31.         StringBuffer sb=new StringBuffer();   
32.         sb.append("userId="+this.userId);   
33.         return sb.toString();   
34.     }   
35. }   package com.sinosuperman.memcached;
37. import java.io.Serializable;
40. public class User implements Serializable{
42.         private static final long serialVersionUID = -372274003834027815L;
44.         String userId;
45.        
46.         public User(String userId) {
47.                 super();
48.                 this.userId = userId;
49.         }
50.        
51.         public String getUserId() {
52.                 return userId;
53.         }
54.        
55.         public void setUserId(String userId) {
56.                 this.userId = userId;
57.         }
58.                
59.         @Override
60.         public String toString() {
61.                 // TODO Auto-generated method stub
62.                 StringBuffer sb=new StringBuffer();
63.                 sb.append("userId="+this.userId);
64.                 return sb.toString();
65.         }
66. }

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6. 编写一个Memcached的客户端
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3. package com.sinosuperman.memcached;  
4.   
5. import java.io.IOException;  
6. import java.net.InetSocketAddress;  
7.   
8. import net.spy.memcached.MemcachedClient;  
9.   
10. public class TestMemcached {  
11.     public static void main(String[] args) throws IOException {  
12.         MemcachedClient cache = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));  
13.         for (int i = 1; i < 10; i++) {  
14.             cache.set("T0001" + i, 3600, new User(i + ""));   
15.         }  
16.         User myObject = (User) cache.get("T00011");  
17.         System.out.println("Get object from mem :" + myObject);   
18.     }   
19. }  package com.sinosuperman.memcached;
21. import java.io.IOException;
22. import java.net.InetSocketAddress;
24. import net.spy.memcached.MemcachedClient;
26. public class TestMemcached {
27.         public static void main(String[] args) throws IOException {
28.                 MemcachedClient cache = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));
29.                 for (int i = 1; i < 10; i++) {
30.                         cache.set("T0001" + i, 3600, new User(i + ""));       
31.                 }
32.                 User myObject = (User) cache.get("T00011");
33.                 System.out.println("Get object from mem :" + myObject);
34.         }
35. }

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7. 运行测试

运行结果应该如下：
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3. 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  
4. 2011-12-15 17:25:30.292 INFO net.spy.memcached.MemcachedConnection:  Connection state changed for sun.nio.ch.SelectionKeyImpl@c62080  
5. Get object from mem :userId=1  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
6. 2011-12-15 17:25:30.292 INFO net.spy.memcached.MemcachedConnection:  Connection state changed for sun.nio.ch.SelectionKeyImpl@c62080
7. Get object from mem :userId=1

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