public class MD5 {
/**
* MD5 字符串加密
*
* @param plainText 待加密字符串
* @param num 加密位数
* @return 加密后字符串
*/
public static String md5(String plainText, int num) throws NoSuchAlgorithmException {
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(plainText.getBytes());
byte b[] = md.digest();
int i;
StringBuilder buf = new StringBuilder("");
for (byte aB : b) {
i = aB;
if (i < 0)
i += 256;
if (i < 16)
buf.append("0");
buf.append(Integer.toHexString(i));
}
if (num == 32) {
return buf.toString().toUpperCase();
}
return buf.toString().substring(8, 24).toUpperCase();
}
/**
* MD5 字符串加密
*
* @param plainText 待加密字符串
* @return 加密后字符串
*/
public static String md5(String plainText) {
String passwd = "";
try {
passwd = md5(plainText, 32);
} catch (Exception e) {
}
return passwd;
}
}