Java 我有来自<；jsp:ForwardPage="/myservlet“/&燃气轮机；单击提交输入时

我的jsp页面web/jspPages/addReport.jsp

<%if(request.getParameter("addReport") != null){ %>
<jsp:forward page="/addReportGuiControlServlet" />
<%} %>

<form action="addReport.jsp" name="myform" method="POST">
    <h4 class="desc">How many people are there in the queue?</h4>
    <div>   
        <input class="addreport" type="checkbox" id="isLast" name="isLast">
        <label class="desc">I'm the last of the queue</label>
    </div>
    <div class="container1">
        <input class="addreport" type="text" name="queueLen" id="queueLen" autocomplete="off">
    </div>
    <div class="container2">    
        <input class="addreport" type="submit" name="addReport" value="Add Report">
    </div>
</form>

My web.xml

<servlet>
    <servlet-name>AddReportGuiControlServlet</servlet-name>
    <servlet-class>logic.boundary.web.controlgrafico.AddReportGuiControlServlet</servlet-class>
</servlet>

<servlet-mapping>
    <servlet-name>AddReportGuiControlServlet</servlet-name>
    <url-pattern>/addReportGuiControlServlet</url-pattern>
</servlet-mapping>

AddReportGuiControlServlet
logic.boundary.web.controlgrafico.AddReportGuiControlServlet
AddReportGuiControlServlet
/addReportGuiControlServlet

---

由此产生的错误是一个无限循环。我认为问题出在参数“addReport”上，因为在servlet中我试图打印它，结果是！=null，但我不知道如何设置此值。

我通过在Servlet的URL中添加一个参数来解决此问题：

RequestDispatcher rd = request.getRequestDispatcher("/jspPages/addReport.jsp?forward=true");

然后我将控件插入JSP：

<%if(request.getParameter("addReport") != null){
    //controllo se la pagina è stata già mandata dalla servlet

    if(request.getParameter("forward") == null){
    %>
        <jsp:forward page="/addReportGuiControlServlet"></jsp:forward>
    <%
    }
}
%>

---

这是因为参数addReport保持不为null，因此Servlet转发的结果将通过在Servlet的URL中添加一个参数来解决：

RequestDispatcher rd = request.getRequestDispatcher("/jspPages/addReport.jsp?forward=true");

然后我将控件插入JSP：

<%if(request.getParameter("addReport") != null){
    //controllo se la pagina è stata già mandata dalla servlet

    if(request.getParameter("forward") == null){
    %>
        <jsp:forward page="/addReportGuiControlServlet"></jsp:forward>
    <%
    }
}
%>

---

这是因为参数addReport保持不为null，然后Servlet转发

Hi why you have

，因为我需要传递jsp中的另一个信息。我的想法是用所有这些信息填充一个bean，然后转发给servletHi为什么要
，因为我需要传递jsp中的另一个信息。我的想法是用所有这些信息填充bean，然后转发到servlet