memcached-session-manager(MSM) + Tomcat集群session共享
1、创建一个登陆的web项目做测试，名为session
环境 windows + JDK1.6 +两个Tomcat6 + MSM 1.8 + memcached-win32-1.4.4-14
1.1 login.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>登录页面</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
</head>
<body>
<table bgcolor="#F8C3C3" border="1" borderColor="#FF0000"
align="center" width="260" height="160">
<tr>
<td height="15" colspan="2" align="center"
style="background-color: #000000; font-size: 28px; color: #FFFF00"><b>用户登录</b></td>
</tr>
<form method="post" action="LoginSevlet">
<tr>
<td width="80" align="center"><b>用户名</b></td>
<td><input type="text" name="userName" value="" /></td>
</tr>
<tr>
<td align="center"><b>密 码</b></td>
<td><input type="password" name="password" value="" /></td>
</tr>
<tr>
<td colspan="2" align="center" style="background-color: #000000;">
<input type="submit" value="登 录" /> <input type="reset"
value="重 置" />
</td>
</tr>
</form>
</table>
</body>
</html>
1.2 success.jsp 页面
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>登录成功页面</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
</head>
<%
String userName = (String) request.getSession().getAttribute("userName");
%>
<body bgcolor="#000000">
<table width="500" height="200" align="center" border="1"
style="background-color: #000000;">
<tr>
<td align="center"
style="background-color: #F8C3C3; color: #00FF00; font-weight: bold; font-size: 30px">
当前登录用户：<%=userName %>
</td>
</tr>
</table>
</body>
</html>
1.3 Servlet 类
package org.shirdrn.cluster.tomcat.servlet;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class LoginSevlet extends HttpServlet {
private static final long serialVersionUID = 8278367768726269037L;
private static Map<String, String> accountDB = new HashMap<String, String>();
static {
accountDB.put("shirdrn", "123456");
accountDB.put("admin", "999999");
accountDB.put("dev", "000888");
accountDB.put("007", "007007");
}
public LoginSevlet() {
super();
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doPost(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String userName = request.getParameter("userName");
String password = request.getParameter("password");
if(userName!=null && password!=null
&& accountDB.containsKey(userName)
&& accountDB.get(userName).equals(password)) {
request.getSession().setAttribute("userName", userName);
request.getRequestDispatcher("success.jsp").forward(request, response);
} else {
request.getRequestDispatcher("login.jsp").forward(request, response);
}
}
}
1.4 web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<servlet>
<servlet-name>LoginSevlet</servlet-name>
<servlet-class>org.shirdrn.cluster.tomcat.servlet.LoginSevlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LoginSevlet</servlet-name>
<url-pattern>/LoginSevlet</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>login.jsp</welcome-file>
</welcome-file-list>
</web-app>
1.5 将项目导入session.war包放到两个tomcat的\apache-tomcat-6.0.41\webapps 目录下面。
2、下载memcached-session-manager 相关jar包
jsf-api.jar 和jsf-impl.jar是J2EE 的包，在myeclipse下面可以搜索到。
第二个红区域内的包在http://code.google.com/p/memcached-session-manager下载，memcached-session-manager-tcx.jar，这个是根据你的tomcat来的我的是tomcat6，所以memcached-session-manager-tc6.jar，如果你的是其它版本则自己去下载相应版本有6,7,8三个版本。
spymemcached-2.10.3.jar是在http://spymemcached.googlecode.com下载
将这些jar 包 放到两个 tomcat 的lib 下面。
tomcat启动问题： MemcachedSessionService starts initialization... (configured nodes definition n1:localhost:11211, failover nodes null)
解决方法：加入spymemcached-2.10.3.jar
3、修改两个tomcat 配置文件
3.1 Tomcat 1 /conf/server.xml
第一个地方：<Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat1">
第二个地方： </Host> 标签内添加下面内容，端口号默认不改。
<Context docBase="/session.war" path="/session" reloadable="true"> <Manager className="de.javakaffee.web.msm.MemcachedBackupSessionManager" memcachedNodes="n1:localhost:11211,n2:localhost:11311" <span style="color:#ff6666;">failoverNodes="n1"</span> requestUriIgnorePattern=".*\.(png|gif|jpg|css|js)$" sessionBackupAsync="false" sessionBackupTimeout="100" transcoderFactoryClass="de.javakaffee.web.msm.serializer.javolution.JavolutionTranscoderFactory" copyCollectionsForSerialization="false" /> </Context>
3.2 Tomcat 2 /conf/server.xml
第一个地方：改端口号
<Server port="8006" shutdown="SHUTDOWN">
<Connector port="8081" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8443" />
<Connector port="8089" protocol="AJP/1.3" redirectPort="8443" />
第二个地方：<Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat2">
第三个地方： </Host> 标签内添加下面内容
<Context docBase="/session.war" path="/session" reloadable="true"> <Manager className="de.javakaffee.web.msm.MemcachedBackupSessionManager" memcachedNodes="n1:localhost:11211,n2:localhost:11311" <span style="color:#ff6666;">failoverNodes="n2"</span> requestUriIgnorePattern=".*\.(png|gif|jpg|css|js)$" sessionBackupAsync="false" sessionBackupTimeout="100" transcoderFactoryClass="de.javakaffee.web.msm.serializer.javolution.JavolutionTranscoderFactory" copyCollectionsForSerialization="false" /> </Context>
tomcat1与tomcat2配置区别就是红色的地方，其它默认。
4、启动memcached
4.1 本机是winows 系统启动两个memcached 需要改端口号,假设Memcached在如下目录：D:\memcached-win32-1.4.4-14，后面我会上传到资源库中。
4.2在CMD中执行如下命令即可再安装一个Memcached服务（记得换个端口号啊！）：
sc create "Memcached Server1" start= auto binPath= "D:\memcached-win32-1.4.4-14\memcached.exe -d runservice -m 32 -p 11311 -l localhost" DisplayName= "Memcached Server1"
4.3.下面是启动、停止、卸载该服务的命令：
sc start "Memcached Server1" //启动
sc stop "Memcached Server1" //停止
sc delete "Memcached Server1" //卸载该服务
4.4 启动成功后进程里面会有两个 memcached.exe
5.启动tomcat1和tomcat2
5.1 启动不报错后,我们再来测试两个tomcat之间的数据共享。首先访问tomcat1的 http://localhost:8080/session/login.jsp 用户名 admin 密码 999999 登陆成功后跳转到success.jsp页面显示 当前登录用户：admin ,然后我们关闭tomcat1 , tomcat2不要关闭了。
5.2 访问tomcat2的 http://localhost:8081/session/success.jsp ,也显示 ”当前登陆用户：admin, tomcat 2 我都没有登陆，直接进入到success.jsp竟然也能显示与tomcat1登陆后信息一样，说明 tomcat1 当机了之后，tomcat2 能从memcached 取 tomcat1 保存的信息，从而实现session共享了。
代码是copy别人的，具体的自己引入到eclipse中看。
6. 免费下载链接
1、memcached-win32-1.4.4-14.zip
2、MSM1.8集群相关jar包
3、session.war 项目包