Java根据UA判断手机，平板，PC登录

/**
* 校验是否手机端
* @param request
* @return
*/
public boolean isFromMobile(HttpServletRequest request) {
//1. 获得请求UA
String userAgent = request.getHeader("USER-AGENT").toLowerCase();

//2.声明手机和平板的UA的正则表达式
// \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 phoneReg = "\\b(ip(hone|od)|android|opera m(ob|in)i" + "|windows (phone|ce)|blackberry"
+ "|s(ymbian|eries60|amsung)|p(laybook|alm|rofile/midp" + "|laystation portable)|nokia|fennec|htc[-_]"
+ "|mobile|up.browser|[1-4][0-9]{2}x[1-4][0-9]{2})\\b";
String tableReg = "\\b(ipad|tablet|(Nexus 7)|up.browser" + "|[1-4][0-9]{2}x[1-4][0-9]{2})\\b";

// 3.移动设备正则匹配：手机端、平板
Pattern phonePat = Pattern.compile(phoneReg, Pattern.CASE_INSENSITIVE);
Pattern tablePat = Pattern.compile(tableReg, Pattern.CASE_INSENSITIVE);
if (null == userAgent) {
userAgent = "";
}
// 4.匹配
Matcher matcherPhone = phonePat.matcher(userAgent);
Matcher matcherTable = tablePat.matcher(userAgent);
if (matcherPhone.find() || matcherTable.find()) {
return true; //来自手机或者平板
} else {
return false; //来自PC
}
}