本文记录nginx+redis+tomcat实现session共享的过程
tomcat-redis-session-manager组件:https://github.com/jcoleman/tomcat-redis-session-manager
tomcat-redis-sessoin-manager对tomcat的支持:
(1) tomcat6:支持，要求jdk为1.6, 需要引入tomcat-redis-session-manager-1.2-tomcat-6.jar，不过现在已经处理不维护的状态
(2) tomcat7:支持，jdk可以是1.6或1.7,需要引入tomcat-redis-session-manager-1.2-tomcat-7.jar; 如果引入的是tomcat-redis-session-manager-1.2-tomcat-7-java-7.jar则仅支持JDK1.7
(3) tomcat8:目前不支持， 可以尝试一下https://github.com/chexagon/redis-session-manager(未实际验证)
组件下载:https://github.com/jcoleman/tomcat-redis-session-manager/downloads
使用组件版本
nginx:1.8.0
tomcat两个:6.0.44
redis:2.4.10
JDK:1.6.0_34
（1） 将下面所有依赖的这些jar包放在$TOMCAT_HOME/lib中:
jedis-2.0.0.jar tomcat-redis-session-manager-1.2-tomcat-6.jar commons-pool-1.5.5.jar
（2） 两个tomcat分别配置conf/context.xml，增加：
Xml代码 
- <Valve className="com.radiadesign.catalina.session.RedisSessionHandlerValve" />
- <Manager className="com.radiadesign.catalina.session.RedisSessionManager"
- host="localhost"
- port="6379"
- database="0"
- maxInactiveInterval="60" />
<Valve className="com.radiadesign.catalina.session.RedisSessionHandlerValve" />
<Manager className="com.radiadesign.catalina.session.RedisSessionManager"
host="localhost"
port="6379"
database="0"
maxInactiveInterval="60" />
另外，分别配置两个tomcat的HTTP监听端口为6181和6182
(3) nginx配置：
Java代码
- upstream cluster_redis {
- server localhost:6181;
- server localhost:6182;
- }
- server {
- listen 6180;
- server_name localhost;
- location / {
- proxy_pass http://cluster_memcached;
- }
- }
upstream cluster_redis {
server localhost:6181;
server localhost:6182;
}
server {
listen 6180;
server_name localhost;
location / {
proxy_pass http://cluster_memcached;
}
}
这里配置nginx监听端口为6180，并请所有的请求反向代理到6181和6182的tomcat集群.
（4） 测试代码session.jsp：
Jsp代码
- <%@ page import="java.util.Enumeration" %>
- <%@ page contentType="text/html;charset=UTF-8" language="java" %>
- <html>
- <head>
- <title>session test</title>
- <%
- String key = request.getParameter("sessionKey");
- String value = request.getParameter("sessionValue");
- if(key != null && !"".equalsIgnoreCase(key.trim())) {
- session.setAttribute(key, value);
- }
- %>
- </head>
- <body>
- <form action="session.jsp" method="post">
- <input type="text" name="sessionKey" value="key1"><input type="text" name="sessionValue" value="value1">
- <input type="submit" value="提交">
- </form>
- <h4>已经存储的session--<%=session.getServletContext().getRealPath("/")%></h4>
- <table>
- <tr>
- <th>key</th>
- <th>value</th>
- </tr>
- <%
- Enumeration<String> keys = session.getAttributeNames();
- while(keys.hasMoreElements()){
- String k = keys.nextElement();
- String v = (String)session.getAttribute(k);
- %>
- <tr>
- <td><%=k%></td>
- <td><%=v%></td>
- </tr>
- <%
- }
- %>
- </table>
- </body>
- </html>
<%@ page import="java.util.Enumeration" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>session test</title>
<%
String key = request.getParameter("sessionKey");
String value = request.getParameter("sessionValue");
if(key != null && !"".equalsIgnoreCase(key.trim())) {
session.setAttribute(key, value);
}
%>
</head>
<body>
<form action="session.jsp" method="post">
<input type="text" name="sessionKey" value="key1"><input type="text" name="sessionValue" value="value1">
<input type="submit" value="提交">
</form>
<h4>已经存储的session--<%=session.getServletContext().getRealPath("/")%></h4>
<table>
<tr>
<th>key</th>
<th>value</th>
</tr>
<%
Enumeration<String> keys = session.getAttributeNames();
while(keys.hasMoreElements()){
String k = keys.nextElement();
String v = (String)session.getAttribute(k);
%>
<tr>
<td><%=k%></td>
<td><%=v%></td>
</tr>
<%
}
%>
</table>
</body>
</html>
需要注意的是,tomcat-redis-session-manager组件并不提供redis集群的支持。对该问题，作者的解释是推荐使用twitter的twemproxy或者碗豆荚的codis之类的redis代理服务。
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