java MD5加密

package com.wiseweb.util;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import sun.misc.BASE64Encoder;

public class MD5 {
    public static String EncoderByMd5(String str)
            throws NoSuchAlgorithmException, UnsupportedEncodingException {
        // MD5 加密，BASE64解析成字符串
        MessageDigest md5 = MessageDigest.getInstance("MD5");
        BASE64Encoder base64en = new BASE64Encoder();
        String newStr = base64en.encode(md5.digest(str.getBytes("utf-8")));
        return newStr;
    }
}

public static String EncoderByMd5(String sourceStr) {
        String result = "";
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(sourceStr.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));
            }
            
            result = buf.toString();
            System.out.println("MD5(" + sourceStr + ",32) = " + result);
            System.out.println("MD5(" + sourceStr + ",16) = " + buf.toString().substring(8, 24));
         } catch (NoSuchAlgorithmException e) {
            System.out.println(e);
        }
        return result;
    }