📄 exceptionhandlerservlet.java
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package scwcd.lab05;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
public class ExceptionHandlerServlet extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException {
response.setContentType("text/html; charset=GB2312");
PrintWriter out = response.getWriter();
Integer status_code =(Integer)request.getAttribute(
"javax.servlet.error.status_code");
if ( status_code.intValue() == 401 ) {
out.println("<HTML><BODY>");
out.println("<H2><font color=#0000FF>HTTP Status Code: ");
out.println(status_code);
out.println("</font></H2>");
out.println("<BR>");
out.println("您尚未通过服务器的验证程序，无法浏览该网页！");
out.println("</BODY></HTML>");
}
if ( status_code.intValue() == 404 ) {
out.println("<HTML><BODY>");
out.println("<H2><font color=#0000FF>HTTP Status Code: ");
out.println(status_code);
out.println("</font></H2>");
out.println("<BR>");
out.println("您所指定的URL不正确，或是要访问的文件已移动到其他位置！");
out.println("</BODY></HTML>");
}
}
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