Java 對字串進行MD5加密
try {
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(plainText.getBytes());
byte b[] = md.digest();
int i;
StringBuffer buf = new StringBuffer("");
for (int offset = 0; offset < b.length; offset++) {
i = b[offset];
if (i < 0) i += 256;
if (i < 16)
buf.append("0");
buf.append(Integer.toHexString(i));
}
System.out.println("result: " + buf.toString());//32位的加密
System.out.println("result: " + buf.toString().substring(8, 24));//16位的加密
return buf.toString();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
return "";
}