import java.security.MessageDigest;

import org.apache.commons.codec.binary.Base64;
import org.apache.commons.codec.digest.DigestUtils;

public class MD5Util {

    /***

     * MD5加密 生成md5码

     * @param 待加密字符串

     * @return 返回md5码

     */

    public static String md5Encode(String inStr) throws Exception {

        MessageDigest md5 = null;

        try {

            md5 = MessageDigest.getInstance("MD5");

        } catch (Exception e) {

            System.out.println(e.toString());

            e.printStackTrace();

            return "";

        }

        byte[] byteArray = inStr.getBytes("UTF-8");

        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();

    }

    /**

     * 测试主函数

     * @param args

     * @throws Exception

     */

    public static void main(String args[]) throws Exception {

        String appSecret = new String("12345678");

        String str = appSecret+WriterOrReaderTxt.readTxt()+appSecret;

        String md5=md5Encode(str);

        System.out.println("MD5后：" + md5);

        System.out.println("Base64后：" +Base64.encodeBase64String(md5.getBytes("UTF-8")));

String result = new String(Base64.encodeBase64(DigestUtils.md5(str.getBytes("UTF-8"))),"UTF-8");
         System.out.println(result);

    }

}