實現的原理,是檢測瀏覽器的 USER-AGENT 這個header,然后根據正則表達式來確定客戶端類型。
如果都不匹配，Fallback回退策略是顯示對應的頁面，讓用戶自己選擇。
適合采用二維碼掃描方式下載APP：
JSP版本的代碼如下所示:其他服務端版本請百度搜索。
<%@page import="java.util.regex.Matcher"%> <%@page import="java.util.regex.Pattern"%> <%@ page language="java" pageEncoding="UTF-8"%> <%! // /b 是單詞邊界(連著的兩個(字母字符 與 非字母字符) 之間的邏輯上的間隔),字符串在編譯時會被轉碼一次,所以是 "http://b" // /B 是單詞內部邏輯間隔(連著的兩個字母字符之間的邏輯上的間隔) String androidReg = "http://bandroid|Nexus//b"; String iosReg = "ip(hone|od|ad)"; Pattern androidPat = Pattern.compile(androidReg, Pattern.CASE_INSENSITIVE); Pattern iosPat = Pattern.compile(iosReg, Pattern.CASE_INSENSITIVE); public boolean likeAndroid(String userAgent){ if(null == userAgent){ userAgent = ""; } // 匹配 Matcher matcherAndroid = androidPat.matcher(userAgent); if(matcherAndroid.find()){ return true; } else { return false; } } public boolean likeIOS(String userAgent){ if(null == userAgent){ userAgent = ""; } // 匹配 Matcher matcherIOS = iosPat.matcher(userAgent); if(matcherIOS.find()){ return true; } else { return false; } } %> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; // String userAgent = request.getHeader( "USER-AGENT" ).toLowerCase(); System.out.println("userAgent: "+userAgent); if(null == userAgent){ userAgent = ""; } if(likeAndroid(userAgent)){ System.out.println("likeAndroid: "+true); response.sendRedirect("http://m.iyhjy.com/download.jsp?platform=android"); return; //request.getRequestDispatcher("/download.html").forward(request,response); } else if(likeIOS(userAgent)){ System.out.println("likeIOS: "+true); response.sendRedirect("http://itunes.apple.com/us/app/id714751061"); return; //request.getRequestDispatcher("/index.html").forward(request,response); } %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no"> <title>下載客戶端 - 永恒記憶</title> <link href="css/style.css" rel="stylesheet" type="text/css" /> </head> <body> <div class="p_down"> <div> <a href="index.html"> <img src="images/p_logo.png" class="p_logo" /> </a> </div> <a href="itms-services://?action=download-manifest&url=http://m.iyhjy.com/upload/client/yhjyios.plist" class="apple download"><img src="images/p_down_apple.png" /></a> <a class="download"><img src="images/p_down_and.png" /></a> </div> </body> </html>新聞熱點
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