谁能用java写出和下面效果一样的MD5加密 下面的是C#语言写的

样例：
import java.io.IOException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Test {

public static void main(String[] args) throws IOException{
String plainText = "asdf";
try {
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(plainText.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));
}
System.out.println("result: " + buf.toString());// 32位的加密
System.out.println("result: " + buf.toString().substring(8, 24));// 16位的加密
} catch (NoSuchAlgorithmException e) {
// TODO Auto-generated catch block
e.printStackTrace();

}
}
}