Tomcat实现多域名之间session共享

最近启用二级域名后,面临一个主域名与二级域名之间 session 不能共享的问题,带来的麻烦就是用户在主域名登陆,但由于二级域名 session 不能共享 ,因此无法进行登陆的操作,对一些功能有一些影响。

问题的原因如下
Tomcat 下,不同的二级域名,Session 默认是不共享的,因为 Cookie 名称为 JSESSIONID 的 Cookie 根域是默认是没设置的,访问不同的二级域名,其 Cookie 就重新生成,而 session 就是根据这个 Cookie 来生成的,所以在不同的二级域名下生成的 Session 也不一样。
找到了其原因,就可根据这个原因对 Tomcat 在生成 Session 时进行相应的修改。

快速解决方案1
在项目的/MET-INF/ 目录下创建一个 context.xml 文件,内容为:

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<?xml version="1.0" encoding="UTF-8"?>
<Context useHttpOnly="true" sessionCookiePath="/" sessionCookieDomain=".XXXX.com" />

Done!

快速解决方案2:修改 Tomcat 的 server.xml 文件,内容为:

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<Context path="" docBase="ROOT" reloadable="false" useHttpOnly="true" sessionCookiePath="/" sessionCookieDomain=".XXXX.com" />

Done!

以上两种方案的详细讲解见:http://tomcat.apache.org/tomcat-6.0-doc/config/context.html

快速解决方案3
:生成一个叫做 crossSubdomainSessionValve.jar 的文件,用的时候放在 Tomcat lib 目录下,然后修改 Tomcat server.xml 文件:

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<Valve className="me.seanchang.CrossSubdomainSessionValve" />



原理:取代由 Tomcat 域产生的会话 cookie ,允许该会话 cookie 跨子域共享。

代码:

 
package me.seanchang;
 
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
 
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
 
import org.apache.catalina.Globals;
import org.apache.catalina.connector.Request;
import org.apache.catalina.connector.Response;
import org.apache.catalina.valves.ValveBase;
import org.apache.tomcat.util.buf.MessageBytes;
import org.apache.tomcat.util.http.MimeHeaders;
import org.apache.tomcat.util.http.ServerCookie;
 

public class CrossSubdomainSessionValve extends ValveBase {
        private static Logger log = Logger.getLogger("CrossSubdomainSessionValve");
        public CrossSubdomainSessionValve() {
                super();
                info = "me.seanchang.CrossSubdomainSessionValve/1.0";
        }
 
        @Override
        public void invoke(Request request, Response response) throws IOException,
                        ServletException {
                // this will cause Request.doGetSession to create the session cookie if
                // necessary
                request.getSession(true);
 
                // replace any Tomcat-generated session cookies with our own
                Cookie[] cookies = response.getCookies();
                if (cookies != null) {
                        for (int i = 0; i < cookies.length; i++) {
                                Cookie cookie = cookies[i];
 
                                log.info("CrossSubdomainSessionValve: Cookie name is "
                                                + cookie.getName());
                                if (Globals.SESSION_COOKIE_NAME.equals(cookie.getName()))
                                        replaceCookie(request, response, cookie);
                        }
                }
 
                // process the next valve
                getNext().invoke(request, response);
        }
 
        
        protected void replaceCookie(Request request, Response response, Cookie cookie) {
                // copy the existing session cookie, but use a different domain
                Cookie newCookie = new Cookie(cookie.getName(), cookie.getValue());
                if (cookie.getPath() != null)
                        newCookie.setPath(cookie.getPath());
                        newCookie.setDomain(getCookieDomain(request));
                        newCookie.setMaxAge(cookie.getMaxAge());
                        newCookie.setVersion(cookie.getVersion());
                if (cookie.getComment() != null)
                        newCookie.setComment(cookie.getComment());
                        newCookie.setSecure(cookie.getSecure());
 
                // if the response has already been committed, our replacement strategy
                // will have no effect
                MimeHeaders headers = new MimeHeaders();
                if (response.isCommitted())
 
                        log.info("CrossSubdomainSessionValve: response was already committed!");
                        // find the Set-Cookie header for the existing cookie and replace its
                        // value with new cookie
                        headers = response.getCoyoteResponse().getMimeHeaders();
                        for (int i = 0, size = headers.size(); i < size; i++) {
                                if (headers.getName(i).equals("Set-Cookie")) {
                                        MessageBytes value = headers.getValue(i);
                                        if (value.indexOf(cookie.getName()) >= 0) {
                                                StringBuffer buffer = new StringBuffer();
                                                ServerCookie
                                                                .appendCookieValue(buffer, newCookie.getVersion(),
                                                                                newCookie.getName(), newCookie.getValue(),
                                                                                newCookie.getPath(), newCookie.getDomain(),
                                                                                newCookie.getComment(),
                                                                                newCookie.getMaxAge(),
                                                                                newCookie.getSecure(), true);
 
                                                log.info("CrossSubdomainSessionValve: old Set-Cookie value: "
                                                                + value.toString());
                                                log.info("CrossSubdomainSessionValve: new Set-Cookie value: "
                                                                + buffer);
                                                value.setString(buffer.toString());
                                        }
                                }
                        }
        }
 
        
        protected String getCookieDomain(Request request) {
                String cookieDomain = request.getServerName();
                String[] parts = cookieDomain.split("\\.");
                if (parts.length >= 2)
                        cookieDomain = parts[parts.length - 2] + "."
                                        + parts[parts.length - 1];
                return "." + cookieDomain;
        }
 
        public String toString() turn ("CrossSubdomainSessionValve[container=" + container.getName() + ']');
        }
}

将以上代码导出一个jar文件,放入 $CATALINA_HOME/lib 中,修改 $CATALINA_HOME/conf/server.xml 文件,加入

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<Valve className="me.seanchang.CrossSubdomainSessionValve" />

重启 Tomcat ,Done !

posted @ 2015-09-07 15:17  arun_yh  阅读(669)  评论(0编辑  收藏  举报