我使用NetBeans创建了一个简单的Web应用程序.
截至目前,这是非常基本的.

> servlet接收/ verificon / * url模式的请求.
>它提取/ verificon /后设置的任何字符串,即如果网址为http：// domain / context / verificon / blahblah,则提取blahblah.
>它检查此类字符串是否为已知字符串,并仅显示带有结果的jsp(true / false).

但是,尽管很简单,但在使用测试字符串运行应用程序时出现以下错误：

javax.servlet.ServletException: 
The server side component of the HTTP Monitor has detected a java.lang.StackOverflowError.
This happens when there is an infinite loop in the web module.
Correct the cause of the infinite loop before running the web module again.

org.netbeans.modules.web.monitor.server.MonitorFilter.rethrow(MonitorFilter.java:1648)
org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:473)
mx.tegu.kdor.web.iu.ServletVerificon.processRequest(ServletVerificon.java:51)
mx.tegu.kdor.web.iu.ServletVerificon.doGet(ServletVerificon.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)
mx.tegu.kdor.web.iu.ServletVerificon.processRequest(ServletVerificon.java:51)
mx.tegu.kdor.web.iu.ServletVerificon.doGet(ServletVerificon.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)
mx.tegu.kdor.web.iu.ServletVerificon.processRequest(ServletVerificon.java:51)
mx.tegu.kdor.web.iu.ServletVerificon.doGet(ServletVerificon.java:70)
    ...

然后它不断重复自己.

我的servlet的processRequest方法如下. TestData只是一个辅助类,如果字符串已知则返回Mapeo对象,如果不知道则返回null.

protected void processRequest(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException {
request.setCharacterEncoding("UTF-8");

String h = request.getRequestURI().replaceFirst(request.getContextPath() + "/verificon/","");

TestData td = TestData.getInstance();

Mapeo m = td.getMapeo(h);

boolean valido = false;
if(m != null) {
  valido = true;
}

request.setAttribute("valido",valido);

/*
PrintWriter out = response.getWriter();
out.write("Válido?: " + valido);
out.close();
*/

String respuesta = "WEB-INF/jsp/resultado.jsp";
// Como regla general,forward se utiliza para los GET y sendRedirect para los POST
RequestDispatcher rd = request.getRequestDispatcher(respuesta);
rd.forward(request,response);

}

任何帮助都非常感谢.

如果您需要了解任何其他信息,请告诉我.

谢谢！

注1：servlet的第51行是在processRequest方法结束时对rd.forward()的调用,第70行只是从doGet方法调用processRequest().
注意2：如果我评论前向部分并取消注释PrintWriter部分,一切都按预期工作.
注3：resultado.jsp是一个纯HTML页面,带有正确的doctype def,html,head和body标签,这个：
<％boolean valido =(boolean)request.getAttribute(“valido”);％>
…
<％if(valido){％>
< p为H. VALIDO< / p为H.
<％} else {％>
< p为H.Inválido< / p为H.
<％}％>