根据USER-AGENT判断手机类型并跳转到相应的app下载页面_Android

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实现的原理,是检测浏览器的 USER-AGENT 这个header,然后根据正则表达式来确定客户端类型。

如果都不匹配,Fallback回退策略是显示对应的页面,让用户自己选择。
适合采用二维码扫描方式下载APP:

JSP版本的代码如下所示:其他服务端版本请百度搜索。

<%@page import="java.util.regex.Matcher"%> 
<%@page import="java.util.regex.Pattern"%> 
<%@ page language="java" pageEncoding="UTF-8"%> 
<%! 
// \b 是单词边界(连着的两个(字母字符 与 非字母字符) 之间的逻辑上的间隔),字符串在编译时会被转码一次,所以是 "\\b" 
// \B 是单词内部逻辑间隔(连着的两个字母字符之间的逻辑上的间隔) 

String androidReg = "\\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>下载客户端 - 永恒记忆</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 href="http://m.iyhjy.com/download.jsp?platform=android" class="download"><img src="images/p_down_and.png" /></a> 

</div> 
</body> 
</html>
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