Hello,
I described a problem yesterday in which I could not get a JSP page to run
through a filter servlet. To recap, I am trying to apply a filter to the
output of a JSP using a servlet chain. It seems that the JSP is being
processed properly, but is not subsequently run through the filter of the
servlet I have defined.
To illustrate, I have created a very dumbed-down example of the problem.
I have created a filter servlet called "BlinkFilter". This filter takes each
line from input and applies the <blink> tag on both ends of each line.
I have also created a jsp and a servlet that produce identical output (your
basic "hello world" html):
- hello.bjsp: a JSP
- Hello.java: a Servlet
In my web.xml, I have mapped the following URLs:
- *.bjsp: mapped to "jsp,BlinkFilter"
- /blink/Hello: mapped to "Hello,BlinkFilter"
I have attached the output for hello.bjsp and /blink/Hello. Notice that the
BlinkFilter servlet IS applied when running /blink/Hello, but IS NOT applied
when running hello.bjsp.
I include all relevant source and output files below:
- hello.bjsp source
- Hello.java source file
- BlinkFilter.java source file
- Output of hello.bjsp (NOTE: it is NOT run through the BlinkFilter
servlet)
- Output of Hello servlet (NOTE: it is run through the BlinkFilter servlet)
- The relevant portion of my web.xml, defining mappings of *.bjsp and
/blink/Hello
Any input is appreciated.
Thanks,
Brian Felder
----- Source of hello.bjsp: -----
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>Untitled</title>
</head>
<body>
Hello world!
</body>
</html>
----- End of output of hello.bjsp -----
----- Source of Hello.java -----
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
public class Hello extends HttpServlet {
public void doGet (
//public void doGet (
HttpServletRequest req,
HttpServletResponse res
) throws ServletException, IOException
{
PrintWriter out = res.getWriter();
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0
Transitional//EN\">");
out.println("<html>");
out.println("<head>");
out.println(" <title>Untitled</title>");
out.println("</head>");
out.println("<body>");
out.println("Hello world!");
out.println("</body>");
out.println("</html>");
out.close();
}
}
----- End of source of Hello.java -----
----- Source of BlinkFilter.java -----
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
public class BlinkFilter extends HttpServlet {
/**
* Initialize global variables
*/
public void init(ServletConfig config) throws ServletException {
super.init(config);
}
/**
* Process the HTTP Get request
*/
public void doGet(HttpServletRequest request, HttpServletResponse
response) throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
BufferedReader in = request.getReader();
String line = null;
while ((line = in.readLine()) != null) {
out.println("<BLINK>" + line + "</BLINK>");
}
out.close();
}
public void doPost (HttpServletRequest request, HttpServletResponse
response) throws ServletException, IOException {
doGet(request, response);
}
}
----- End of source of BlinkFilter.java -----
----- Output of hello.bjsp: -----
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>Untitled</title>
</head>
<body>
Hello world!
</body>
</html>
----- End of output of hello.bjsp -----
----- Output of /blink/Hello: -----
<BLINK><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0
Transitional//EN"></BLINK>
<BLINK><html></BLINK>
<BLINK><head></BLINK>
<BLINK> <title>Untitled</title></BLINK>
<BLINK></head></BLINK>
<BLINK><body></BLINK>
<BLINK>Hello world!</BLINK>
<BLINK></body></BLINK>
<BLINK></html></BLINK>
----- End of output of /blink/Hello -----
----- Portion of web.xml -----
<servlet>
<servlet-name>BlinkFilter</servlet-name>
<servlet-class>BlinkFilter</servlet-class>
</servlet>
<servlet>
<servlet-name>Hello</servlet-name>
<servlet-class>Hello</servlet-class>
</servlet>
<servlet-mapping>
<url-pattern>/blink/Hello</url-pattern>
<servlet-name>Hello,BlinkFilter</servlet-name>
</servlet-mapping>
<servlet-mapping>
<url-pattern>*.bjsp</url-pattern>
<servlet-name>jsp,BlinkFilter</servlet-name>
</servlet-mapping>
----- End of portion of web.xml -----
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