errorservlet.java

21天学通java的示例程序源代码

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;

/**
 * This servlet demonstrates how to send HTTP errors to clients.
 */
public class ErrorServlet extends HttpServlet {
  public void doGet(HttpServletRequest request,
                    HttpServletResponse response)
                    throws ServletException, IOException {

    HttpSession session = request.getSession();
    if (session.getAttribute("authenticated") == null) {
      response.sendError(HttpServletResponse.SC_FORBIDDEN,
                         "You are not authenticated to this server");
      return;
    }
    // else process the request
  }
}