import java.math.BigInteger;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;

/**
* MD5 encryption
*
* @author Hongten
*
*/
public class MD5 {

 public static void main(String[] args) {
     System.out.println(MD5.getMD5("123456"));
 }

 /**
  * Use md5 encoded code value
  *
  * @param sInput
  * clearly
  * @ return md5 encrypted password
  */
 public static String getMD5(String sInput) {

     String algorithm = "";
     if (sInput == null) {
         return "null";
     }
     try {
         algorithm = System.getProperty("MD5.algorithm", "MD5");
     } catch (SecurityException se) {
     }
     MessageDigest md = null;
     try {
         md = MessageDigest.getInstance(algorithm);
     } catch (NoSuchAlgorithmException e) {
         e.printStackTrace();
     }
     byte buffer[] = sInput.getBytes();

     for (int count = 0; count < sInput.length(); count++) {
         md.update(buffer, 0, count);
     }
     byte bDigest[] = md.digest();
     BigInteger bi = new BigInteger(bDigest);
     return (bi.toString(16));
 }
}

Codingkit上有一篇关于这个的文章。查看:http://codingkit.com/a/JAVA/2013/1020/2216.html

 import java.math.BigInteger;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;

/**
* MD5 encryption
*
* @author Hongten
*
*/
public class MD5 {

 public static void main(String[] args) {
     System.out.println(MD5.getMD5("123456"));
 }

 /**
  * Use md5 encoded code value
  *
  * @param sInput
  * clearly
  * @ return md5 encrypted password
  */
 public static String getMD5(String sInput) {

     String algorithm = "";
     if (sInput == null) {
         return "null";
     }
     try {
         algorithm = System.getProperty("MD5.algorithm", "MD5");
     } catch (SecurityException se) {
     }
     MessageDigest md = null;
     try {
         md = MessageDigest.getInstance(algorithm);
     } catch (NoSuchAlgorithmException e) {
         e.printStackTrace();
     }
     byte buffer[] = sInput.getBytes();

     for (int count = 0; count < sInput.length(); count++) {
         md.update(buffer, 0, count);
     }
     byte bDigest[] = md.digest();
     BigInteger bi = new BigInteger(bDigest);
     return (bi.toString(16));
 }
}

Codingkit上有一篇关于这个的文章。查看:http://codingkit.com/a/JAVA/2013/1020/2216.html

如果你真的想要返回一个字符串，而不是字节数组，你总是可以这样做:

String plaintext = "your text here";
MessageDigest m = MessageDigest.getInstance("MD5");
m.reset();
m.update(plaintext.getBytes());
byte[] digest = m.digest();
BigInteger bigInt = new BigInteger(1,digest);
String hashtext = bigInt.toString(16);
// Now we need to zero pad it if you actually want the full 32 chars.
while(hashtext.length() < 32 ){
  hashtext = "0"+hashtext;
}

我只是下载了common -codec.jar，得到了完美的php，比如md5。这是手册。

只需将其导入到您的项目并使用即可

String Url = "your_url";

System.out.println( DigestUtils.md5Hex( Url ) );

结果出来了。

Spring中也有一个DigestUtils类:

http://static.springsource.org/spring/docs/3.0.x/javadoc-api/org/springframework/util/DigestUtils.html

这个类包含md5DigestAsHex()方法来完成这项工作。

您可能还想看看apache公用编解码器项目的DigestUtils类，它提供了非常方便的方法来创建MD5或SHA摘要。