本文实例讲述了java实现MD5加密的方法。分享给大家供大家参考，具体如下：
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private String getMD5Str(String str) { MessageDigest messageDigest = null; try { messageDigest = MessageDigest.getInstance("MD5"); messageDigest.reset(); messageDigest.update(str.getBytes("UTF-8")); } catch (NoSuchAlgorithmException e) { System.out.println("NoSuchAlgorithmException caught!"); System.exit(-1); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } byte[] byteArray = messageDigest.digest(); StringBuffer md5StrBuff = new StringBuffer(); for (int i = 0; i < byteArray.length; i++) { if (Integer.toHexString(0xFF & byteArray[i]).length() == 1) md5StrBuff.append("0").append(Integer.toHexString(0xFF & byteArray[i])); else md5StrBuff.append(Integer.toHexString(0xFF & byteArray[i])); } return md5StrBuff.toString();} |
方法二
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import java.security.MessageDigest;public class Test_MD5{ public final static String MD5(String s) { char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' }; try { byte[] strTemp = s.getBytes(); //使用MD5创建MessageDigest对象 MessageDigest mdTemp = MessageDigest.getInstance("MD5"); mdTemp.update(strTemp); byte[] md = mdTemp.digest(); int j = md.length; char str[] = new char[j * 2]; int k = 0; for (int i = 0; i < j; i++) { byte b = md[i]; //System.out.println((int)b); //将没个数(int)b进行双字节加密 str[k++] = hexDigits[b >> 4 & 0xf]; str[k++] = hexDigits[b & 0xf]; } return new String(str); } catch (Exception e) { return null; } } //测试 public static void main(String[] args) { System.out.println("http://www.baidu.com/的MD5加密后：/n"+Test_MD5.MD5("http://www.baidu.com/")); }} |
希望本文所述对大家java程序设计有所帮助。
原文链接：http://blog.sina.com.cn/s/blog_6c769cfa0100x3j7.html
