java实现MD5加密的方法小结

 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 

 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 > 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("caidao的MD5加密后：/n"+Test_MD5.MD5("caidao")); System.out.println("http://www.baidu.com/的MD5加密后：/n"+Test_MD5.MD5("http://www.baidu.com/")); } }