The import java.security.MessageDigest cannot be resolved

Question

When I tried to import MessageDigest class, Eclipse told me this error. But isn't this class included in JDK? How can I solve this problem?

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Md5Util {
    public String EncoderByMd5(String str) throws NoSuchAlgorithmException, UnsupportedEncodingException{
        java.security.MessageDigest md5 = java.security.MessageDigest.getInstance("MD5");
        BASE64Encoder base64en = new BASE64Encoder();
        String newstr=base64en.encode(md5.digest(str.getBytes("utf-8")));
        return newstr;
      }
}

Answer 1

等待大神答复