有条件地使用RequestDispatcher跨多个JSP页面发送相同的Java对象
请容忍我，因为我对JSP很陌生。我提前感谢你的帮助；我非常感激 背景 我试图构建一个web应用程序，它在用户登录会话中“记住”某些java对象。目前，我有一个servlet，它使用RequestDispatcher通过doPost方法将对象发送到JSP页面 以下是servlet的doPost：有条件地使用RequestDispatcher跨多个JSP页面发送相同的Java对象,java,jsp,jakarta-ee,servlets,requestdispatcher,Java,Jsp,Jakarta Ee,Servlets,Requestdispatcher,请容忍我，因为我对JSP很陌生。我提前感谢你的帮助；我非常感激 背景 我试图构建一个web应用程序，它在用户登录会话中“记住”某些java对象。目前，我有一个servlet，它使用RequestDispatcher通过doPost方法将对象发送到JSP页面 以下是servlet的doPost： protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletExce
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String strBook = "Test Book";
// Send strBook to the next jsp page for rendering
request.setAttribute("book", strBook);
RequestDispatcher dispatcher = request.getRequestDispatcher("sample.jsp");
dispatcher.include(request, response);
}
<body>
<%
// Obtain strBook for rendering on current page
String strBook = (String) request.getAttribute("book");
/*
// TODO: A way to conditionally call code below, when form is submitted
// in order for sample2.jsp to have strBook object.
RequestDispatcher dispatcher = request.getRequestDispatcher("sample2.jsp");
dispatcher.include(request, response);
*/
%>
<h1> Book: </h1>
<p> <%=strBook%> </p>
<form action="sample2.jsp" method="post">
<input type="submit" id="buttonSubmit" name="buttonSubmit" value="Buy"/>
</form>
</body>
书：
<body>
<%
// Obtain strBook for rendering on current page
String strBook = (String) request.getAttribute("book");
%>
<h1> Book: </h1>
<p> <%="SAMPLE 2 RESULT " + strBook%> </p>
</body>
书：
<form action="sample2.jsp" method="post">
<input type="submit" id="buttonSubmit" name="buttonSubmit" value="Buy"/>
<input type="hidden" name="book" value="<%=strBook%>"/>
</form>
<%
// Obtain strBook for rendering on current page
String strBook = (String) request.getParameter("book");
%>
<h1> Book: </h1>
<p> <%="SAMPLE 2 RESULT " + strBook%> </p>
书：