最近在做一个项目，要在判断用户是否是通过手机访问网站的，如果是手机访问网站跳到一个登录页面，如果是用户用电脑访问网站跳到另外一个登录页面。我写了以下代码，但是用手机访问网站的时候，跳转不到制定页面，请求回答。

代码如下

servlet代码如下：

package com.lensoon.login;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

import org.apache.log4j.Logger;

import com.lensoon.common.JSF;

public class checkLoginServlet extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

doPost(request,response);

}

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

Logger logger;

logger = Logger.getLogger(this.getClass());

String userAgent = "";

String HTTP_USER_AGENT = request.getHeader("HTTP_USER_AGENT");

System.out.println("aa"+HTTP_USER_AGENT);

String agent = request.getHeader("User-Agent") == null ? "": request.getHeader("User-Agent");//取用户操作系统信息

//System.out.println(agent);

if(agent != null &&choose_jsp(agent)==true){

logger.error("跳转到手机百度");

logger.info("输出浏览器信息：**********************"+userAgent);

response.sendRedirect("http://www.baidu.com");

}

else{

logger.error("跳转到电脑");

request.getRequestDispatcher("Login.faces").forward(request, response);

}

}

public static boolean choose_jsp(String userAgent) {

if (userAgent.indexOf("Noki") > -1 || // Nokia phones and emulators

userAgent.indexOf("Eric") > -1 || // Ericsson WAP phones and emulators

userAgent.indexOf("WapI") > -1 || // Ericsson WapIDE 2.0

userAgent.indexOf("MC21") > -1 || // Ericsson MC218

userAgent.indexOf("AUR") > -1  || // Ericsson R320

userAgent.indexOf("R380") > -1 || // Ericsson R380

userAgent.indexOf("UP.B") > -1 || // UP.Browser

userAgent.indexOf("WinW") > -1 || // WinWAP browser

userAgent.indexOf("UPG1") > -1 || // UP.SDK 4.0

userAgent.indexOf("upsi") > -1 || //another kind of UP.Browser

userAgent.indexOf("QWAP") > -1 || // unknown QWAPPER browser

userAgent.indexOf("Jigs") > -1 || // unknown JigSaw browser

userAgent.indexOf("Java") > -1 || // unknown Java based browser

userAgent.indexOf("Alca") > -1 || // unknown Alcatel-BE3 browser (UP based)

userAgent.indexOf("MITS") > -1 || // unknown Mitsubishi browser

userAgent.indexOf("MOT-") > -1 || // unknown browser (UP based)

userAgent.indexOf("My S") > -1 ||//  unknown Ericsson devkit browser

userAgent.indexOf("WAPJ") > -1 ||//Virtual WAPJAG www.wapjag.de

userAgent.indexOf("fetc") > -1 ||//fetchpage.cgi Perl script from www.wapcab.de

userAgent.indexOf("ALAV") > -1 || //yet another unknown UP based browser

userAgent.indexOf("Wapa") > -1 || //another unknown browser (Web based "Wapalyzer")

userAgent.indexOf("UCWEB") > -1 || //another unknown browser (Web based "Wapalyzer")

userAgent.indexOf("BlackBerry") > -1 || //another unknown browser (Web based "Wapalyzer")

userAgent.indexOf("J2ME") > -1 || //another unknown browser (Web based "Wapalyzer")

userAgent.indexOf("Oper") > -1||

userAgent.indexOf("Android") >-1)

{

return true;

} else {

return false;

}

}

}

web.xml

checkLoginServlet

com.lensoon.login.checkLoginServlet

checkLoginServlet

/checkLoginServlet

输入网址时访问网站的时候会调用这个Login类的构造方法跳转到Login.java这个类中然后用JSF.redirect直接跳转到servlet中，代码如下：

public class Login {

public Login()  {

HttpSession session=JSF.getSession();

if(session.getAttribute("success")==null){

try {

session.setAttribute("success", "pc");

JSF.redirect("checkLoginServlet");//直接跳转到servlet中，是可以跳转的

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

}

代码就是这样，遇到的问题是，用手机访问的时候跳转不到制定页面，等待解答，急用呀！！！！！！！各位大神，来看看把！！！！！！！！！！！

2011年12月23日 20:26