Java判断请求是来自手机端还是PC端

public class BrowserUtils {

    // \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)
    private static final 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";

    private static final String tabletReg = "\\b(ipad|tablet|(Nexus 7)|up.browser|[1-4][0-9]{2}x[1-4][0-9]{2})\\b";

    //移动设备正则匹配：手机端、平板
    private static final Pattern phonePat = Pattern.compile(phoneReg, Pattern.CASE_INSENSITIVE);
    private static final Pattern tabletPat = Pattern.compile(tabletReg, Pattern.CASE_INSENSITIVE);

    /**
     * 检测是否是移动设备访问
     *
     * @param userAgent 浏览器标识
     * @return true:移动设备接入，false:pc端接入
     */
    public static boolean isMobile(String userAgent){
        if(null == userAgent){
            userAgent = "";
        }
        return phonePat.matcher(userAgent).find() || tabletPat.matcher(userAgent).find();
    }
}