JAVA判断移动端还是PC端访问

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 Pattern phonePat = Pattern.compile(phoneReg, Pattern.CASE_INSENSITIVE);       private static 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();     }  }