java實現對url解析

  /**
   * 對經過escape函數加密的url中的字串進行解密
   * @return 解密後的正常字串
   * @param src
   * 參數說明 例如：%u5339%u914D%u8BBE%u5907或者/u5339/u914D/u8BBE/u5907
   */
    public static String unescape(String src) {
         StringBuffer tmp = new StringBuffer();
         tmp.ensureCapacity(src.length());
         int lastPos = 0, pos = 0;
         char ch;
         while (lastPos < src.length()) {
            pos = src.indexOf("%", lastPos);
            if (pos == lastPos) {
               if (src.charAt(pos + 1) == 'u') {
                  ch = (char) Integer.parseInt(src.substring(pos + 2, pos + 6), 16);
                  tmp.append(ch);
                  lastPos = pos + 6;
               }
               else {
                  ch = (char) Integer.parseInt(src.substring(pos + 1, pos + 3), 16);
                  tmp.append(ch);
                  lastPos = pos + 3;
               }
            }
            else {
               if (pos == -1) {
                  tmp.append(src.substring(lastPos));
                  lastPos = src.length();
               }
               else {
                  tmp.append(src.substring(lastPos, pos));
                  lastPos = pos;
               }
            }
         }
         return tmp.toString();
      }