漢字轉換爲%格式

public void text() throws UnsupportedEncodingException{ 
          String s = "你好";
          StringBuffer sb = new StringBuffer();
          for (int i = 0; i < s.length(); i++) {
              char c = s.charAt(i);
              if (c >= 0 && c <= 255) {
                  sb.append(c);
              } else {
                  byte[] b;
                  try {
                      b = String.valueOf(c).getBytes("utf-8");
                  } catch (Exception ex) {
                      System.out.println(ex);
                      b = new byte[0];
                  }
                  for (int j = 0; j < b.length; j++) {
                      int k = b[j];
                      if (k < 0)
                          k += 256;
                      sb.append("%" + Integer.toHexString(k).toUpperCase());
                  }
              }
          }
          System.out.println(sb.toString());
      }

輸出：%E4%BD%A0%E5%A5%BD