Java 生成16/32位 MD5
private static final char HEX_DIGITS[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };private static String toHexString(byte[] b) {
StringBuilder sb = new StringBuilder(b.length * 2);
for (int i = 0; i < b.length; i++) {
sb.append(HEX_DIGITS[(b & 0xf0) >>> 4]);
sb.append(HEX_DIGITS & 0x0f]);
}
return sb.toString();
}
public static String Bit32(String SourceString) throws Exception {
MessageDigest digest = java.security.MessageDigest.getInstance("MD5");
digest.update(SourceString.getBytes());
byte messageDigest[] = digest.digest();
return toHexString(messageDigest);
}
public static String Bit16(String SourceString) throws Exception {
return Bit32(SourceString).substring(8, 24);
}
还有一个
private final static String[] strDigits = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
// 返回形式为数字跟字符串
private static String byteToArrayString(byte bByte) {
int iRet = bByte;
// System.out.println("iRet="+iRet);
if (iRet < 0) {
iRet += 256;
}
int iD1 = iRet / 16;
int iD2 = iRet % 16;
return strDigits + strDigits;
}
// 返回形式只为数字
// private static String byteToNum(byte bByte) {
// int iRet = bByte;
// System.out.println("iRet1=" + iRet);
// if (iRet < 0) {
// iRet += 256;
// }
// return String.valueOf(iRet);
// }
// 转换字节数组为16进制字串
private static String byteToString(byte[] bByte) {
StringBuffer sBuffer = new StringBuffer();
for (int i = 0; i < bByte.length; i++) {
sBuffer.append(byteToArrayString(bByte));
}
return sBuffer.toString();
}
/**
*
* @param strObj
* @Return
*/
public static String GetMD5Code(String strObj) {
String resultString = null;
try {
resultString = new String(strObj);
MessageDigest md = MessageDigest.getInstance("MD5");
// md.digest() 该函数返回值为存放哈希值结果的byte数组
resultString = byteToString(md.digest(strObj.getBytes()));
} catch (NoSuchAlgorithmException ex) {
ex.printStackTrace();
}
return resultString;
}
我也只能看看
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