利用Java计算String的MD5

private final String[] strDigits = { "0", "1", "2", "3", "4", "5", "6","7", "8", "9", "a", "b", "c", "d", "e", "f" };private String byteToArrayString(byte bByte) {int iRet = bByte;if (iRet < 0) {iRet += 256;}int iD1 = iRet / 16;int iD2 = iRet % 16;return strDigits[iD1] + strDigits[iD2];}private String byteToString(byte[] bByte) {StringBuffer sBuffer = new StringBuffer();for (int i = 0; i < bByte.length; i++) {sBuffer.append(byteToArrayString(bByte[i]));}return sBuffer.toString();}public String GetMD5Code(String strObj) {String resultString = null;try {resultString = new String(strObj);MessageDigest md = MessageDigest.getInstance("MD5");resultString = byteToString(md.digest(strObj.getBytes()));} catch (NoSuchAlgorithmException ex) {ex.printStackTrace();}return resultString;}

在mian函数中调用GetMD5Code(str)方法即可。