Java判断是否为手机端访问

/**
* 根据当前请求的特征，判断该请求是否来自手机终端，主要检测特殊的头信息，以及user-Agent这个header
* 
* @param request
*            http请求
* @return 如果命中手机特征规则，则返回对应的特征字符串
*/
public static boolean isMobileDevice(HttpServletRequest request) {
boolean b = false;
boolean pcFlag = false;
boolean mobileFlag = false;
String via = request.getHeader("Via");
String userAgent = request.getHeader("user-agent");
for (int i = 0; via != null && !via.trim().equals("") && i < mobileGateWayHeaders.length; i++) {
if (via.contains(mobileGateWayHeaders[i])) {
mobileFlag = true;
break;
}
}
for (int i = 0; !mobileFlag && userAgent != null && !userAgent.trim().equals("")
&& i < mobileUserAgents.length; i++) {
if (userAgent.contains("iPad")) {
pcFlag = true;
break;
}

if (userAgent.contains(mobileUserAgents[i])) {
mobileFlag = true;
break;
}
}
for (int i = 0; userAgent != null && !userAgent.trim().equals("") && i < pcHeaders.length; i++) {
if (userAgent.contains(pcHeaders[i])) {
pcFlag = true;
break;
}
}
if (mobileFlag == true && pcFlag == false) {
b = true;
}
return b;// false pc true shouji

}