JAVA:MD5加密

gistfile1.java

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

public class Md5 {
	public static String toMd5(String arg) {
		try {
			MessageDigest md = MessageDigest.getInstance("MD5");
			md.update(arg.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));
			}
			return buf.toString();
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		}
		return null;
	}

	public static void main(String[] args) {
		System.out.println(Md5.toMd5("123"));
	}
}