md5工具类

import java.security.MessageDigest;

/**
 * MD5工具类，用于生产字符串的MD5码
 * @author iStar
 *
 */
public class MD5 {

    public static String getMD5(String s) {
        try {
            MessageDigest md5 = MessageDigest.getInstance("MD5");

            byte[] byteArray = s.getBytes("ISO-8859-1");
            byte[] md5Bytes = md5.digest(byteArray);

            StringBuffer hexValue = new StringBuffer();

            for (int i = 0; i < md5Bytes.length; i++) {
                int val = ((int) md5Bytes[i]) & 0xff;
                if (val < 16)
                    hexValue.append("0");
                hexValue.append(Integer.toHexString(val));
            }

            return hexValue.toString();

        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
}