can't print after post doFilter

Greenhorn

Posts: 2

posted 15 years ago

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Hi i'm having problems with the filter. i'm trying to just print after i have done a doFilter and only the Pre message is showing and no the post...
this is the filter code:

the servlet file is looking like this:

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.PrintWriter;

public class NewServlet extends HttpServlet 
{
   
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try 
        {
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet Filter...</title>");
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>You have entered : \"" + request.getParameter("TextBox").toString() + "\"</h1>");
            out.println("</body>");
            out.println("</html>");
            
        } finally { 
            out.close();
        }
    }

@Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }

@Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }

@Override
    public String getServletInfo() 
    {
        return "Short description";
    }
}

and the web.xml file is like this:

<filter>
        <filter-name>servletFilter</filter-name>
        <filter-class>ServletFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>servletFilter</filter-name>
        <servlet-name>NewServlet</servlet-name>
        <dispatcher>REQUEST</dispatcher>
        </filter-mapping>
    <servlet>
        <servlet-name>NewServlet</servlet-name>
        <servlet-class>NewServlet</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>NewServlet1</servlet-name>
        <servlet-class>NewServlet1</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>NewServlet</servlet-name>
        <url-pattern>/NewServlet</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>NewServlet1</servlet-name>
        <url-pattern>/NewServlet1</url-pattern>
    </servlet-mapping>
    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>
    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
        </welcome-file-list>

why does the POST is not printing ?

tnx
LaBBa

Carey Evans

Ranch Hand

Posts: 225

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posted 15 years ago

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Your servlet closes the PrintWriter, so it’s closed when your filter tries to write to it. It's generally unnecessary to close the output writer in a servlet.

If you can't change the servlet, you may have to subclass the response wrapper used in the filter so that it returns an output writer that ignores the close() method.

Bear Bibeault

Sheriff