Using several classes by creating packages
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For some reason, Tomcat will not recognize classes in the directory
where your servlet is running. In order to have your servlet use classes
which you create you will need to put these classes inside of a package.
Then your servlet can import this package and access your classes.
For example, if you want to create and use the following class:
public class stam
{
int number;
char letter;
public stam(int n, char l )
{
number=n;
letter=l;
}
public int getNumber()
{return number;}
public char getletter()
{return letter;}
}
You must first create a directory in horayot:~/javaserver/WEB-INF/classes
called, for example, stampackage. Then you must add the following line
to the start of the above class:
package stampackage;
Then after you compile the above class, place the compiled version (.class)
and the source code (.java) in the directory
horayot:~/javaserver/WEB-INF/classes/stampackage.
Then set the permissions correctly (i.e. 755) for the directory and the files
inside it.
Now, in your servlet add the following line to the start of your servlet source
code:
import stampackage.*;
Now your servlet can create instances of the class stam. When you compile the
servlet it should work.
Example using an instance of the class "stam":
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import stampackage.*;
public class Ex1 extends HttpServlet{
public void init(ServletConfig config)
throws ServletException{ }
public void doGet (HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
stam a = new stam(7,'w');
int number = a.getNumber();
PrintWriter output = response.getWriter();
response.setContentType("text/html");
output.println("<HTML><HEAD><Title>Stam Example</Title></HEAD><body>");
output.println("<center><h1><font color=\"blue\"> This Number is from class <i>stam</i>: "+number+"</font></h1></br>");
output.println("</center></body></html>");
}//end doGet
}//end servlet
]]>
© Nachum Danzig 2004