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import java.util.*;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.security.*;
public class MyServlet implements Filter
{
private FilterConfig filterConfig = null;
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain)
throws IOException, ServletException
{
String password = ((HttpServletRequest) request).getParameter("password");
if(password.equals("opensesame")) {
chain.doFilter(request, response);
} else {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<HTML>");
out.println("<HEAD>");
out.println("<TITLE>");
out.println("Incorrect Password");
out.println("</TITLE>");
out.println("</HEAD>");
out.println("<BODY>");
out.println("<H1>Incorrect Password</H1>");
out.println("Sorry, that password was incorrect.");
out.println("</BODY>");
out.println("</HTML>");
}
}
public void destroy() { }
public void init(FilterConfig filterConfig) {
this.filterConfig = filterConfig;
}
}
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Download: ServletFilterCheckRequestParameter.zip( 89 k)