小编Ami*_* Ip的帖子

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class JavaMD5 {

    public static void main(String[] args) {
        String passwordToHash = "MyPassword123";
        String generatedPassword = null;
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(passwordToHash.getBytes());
            byte[] bytes = md.digest();
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < bytes.length; i++) {
                sb.append(Integer.toString((bytes[i] & 0xff) + 0x100, 16).substring(1));
            }
            generatedPassword = sb.toString();

        } catch (NoSuchAlgorithmException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        System.out.println(generatedPassword);
    }
}

这一行是问题所在:

sb.append(Integer.toString((bytes[i] & 0xff) + 0x100, 16).substring(1)); …