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。
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<%@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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