MD5加密

public class MD5psw
{
/** * MD5 加密 */
public static String toMD5Str(String str)
{
MessageDigest messageDigest = null;
try {
messageDigest = MessageDigest.getInstance("MD5");
messageDigest.reset();
messageDigest.update(str.getBytes("UTF-8"));
} catch (NoSuchAlgorithmException e) {
System.out.println("NoSuchAlgorithmException caught!");
System.exit(-1);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
byte[] byteArray = messageDigest.digest();
StringBuffer md5StrBuff = new StringBuffer();
for (int i = 0; i < byteArray.length; i++) {
if (Integer.toHexString(0xFF & byteArray[i]).length() == 1){
md5StrBuff.append("0").append(Integer.toHexString(0xFF & byteArray[i]));
}else{
md5StrBuff.append(Integer.toHexString(0xFF & byteArray[i]));
}
}
return md5StrBuff.toString();
}
}