基于Java如何实现MD5算法

Java????MessageDigest????MD5???????????????:

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class MD5Example {
public static void main(String[] args) {
String input = "Hello World";
try {
// ??MD5????
MessageDigest md = MessageDigest.getInstance("MD5");
// ??????????
byte[] inputBytes = input.getBytes();
// ??MD5??
byte[] mdBytes = md.digest(inputBytes);
// ?????????????
StringBuilder sb = new StringBuilder();
for (byte b : mdBytes) {
sb.append(String.format("x", b));
}
String md5String = sb.toString();
System.out.println("MD5??:" + md5String);
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
}
}

?????????????:

MD5??:7b502c3a1f48c8609ae212cdfb639dee