【轉】Java中實現字串與十六進位編碼相互轉換 __Ajax

//轉化字串為十六進位編碼 public static String toHexString(String s) { String str=""; for (int i=0;i<s.length();i++) { int ch = (int)s.charAt(i); String s4 = Integer.toHexString(ch); str = str + s4; } return "0x" + str;//0x表示十六進位 } //轉換十六進位編碼為字串 public static String toStringHex(String s) { if("0x".equals(s.substring(0, 2))) { s =s.substring(2); } byte[] baKeyword = new byte[s.length()/2]; for(int i = 0; i < baKeyword.length; i++) { try{ baKeyword[i] = (byte)(0xff & Integer.parseInt(s.substring(i*2, i*2+2),16)); } catch(Exception e){ e.printStackTrace(); } } try { s = new String(baKeyword, "utf-8");//UTF-16le:Not } catch (Exception e1){ e1.printStackTrace(); } return s; } //＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝ //下面做個測試 public static void main(String[] args) throws Exception { String str = "test"; printHexString(str.getBytes()); } public static void printHexString( byte[] b) { for (int i = 0; i < b.length; i++) { String hex = Integer.toHexString(b[i] & 0xFF); if (hex.length() == 1) { hex = '0' + hex; } System.out.print(hex.toUpperCase() ); } } //輸出結果:74657374