Packages inside packages
I am trying to learn servlets. I am trying to get this simple servlets to work with a little encryption package I wrote. The Encryption file is inside the history folder.
Here is the servlet:
package history;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import Encryption.*;
public class SignUp extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException
response.setContentType("text/html");
PrintWriter out = response.getWriter();
String title = "Reading Three Request Parameters";
String docType = "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 " + "Transitional//EN\">\n";
String name, pass1, pass2, encrypted;
Encrypt encrypt = new Encrypt(); [red]//error is here[/red}
name = request.getParameter("param1");
pass1 = request.getParameter("param2");
pass2 = request.getParameter("param3");
if(!pass1.equals(pass2))
out.println(docType + "<HTML>\n" +
"<HEAD><TITLE>" + title + "</TITLE></HEAD>\n" +
"<BODY BGCOLOR=\"#FDF5E6\">\n" +
"<H1 ALIGN=\"CENTER\">" + title + "</H1>\n" +
"<UL>\n" + "ERROR" + "</UL>\n" +
"</BODY></HTML>");
else
encrypted = encrypt.encode(name, pass1);
out.println(docType +
"<HTML>\n" +
"<HEAD><TITLE>" + title + "</TITLE></HEAD>\n" +
"<BODY BGCOLOR=\"#FDF5E6\">\n" +
"<H1 ALIGN=\"CENTER\">" + title + "</H1>\n" +
"<UL>\n" +
" <LI><B>param1</B>: "
+ request.getParameter("param1") + "\n" +
" <LI><B>param2</B>: "
+ request.getParameter("param2") + "\n" +
" <LI><B>param3</B>: "
+ request.getParameter("param3") + "\n" +
+ encrypted + "\n" +
"</UL>\n" +
"</BODY></HTML>");
}This is the error:
history/SignUp.java:6: package Encryption does not exist
import Encryption.*;
^
history/SignUp.java:26: cannot resolve symbol
symbol : class Encrypt
location: class history.SignUp
Encrypt encrypt = new Encrypt();
^
history/SignUp.java:26: cannot resolve symbol
symbol : class Encrypt
location: class history.SignUp
Encrypt encrypt = new Encrypt();
^
3 errors
I tried this:
import history.Ecryption.*;
But got a different error:
history/SignUp.java:26: cannot access history.Encryption.Encrypt
bad class file: .\history\Encryption\Encrypt.class
class file contains wrong class: Encryption.Encrypt
Please remove or make sure it appears in the correct subdirectory of the classpa
th.
Encrypt encrypt = new Encrypt();
^
1 error
Any advice will be greatly appreciated.
My guess is that in the Encrypt class, you probably have this:
package Encryption;
If it's to be under "history", then it should be:
package history.Encryption;
There's no such thing as sub packages, or packages inside packages. The directories the files are stored in are within that directory structure cuz that's how directories are, but packages are not parent/subpackage relationships. "history" and "history.Encryption" would be totally separate packages. This is why you can't do "import history.*" and get all the classes in "history.Encryption" as wel.
Then your import in your servlet would be:
import history.Encryption.*;
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