我在jsp頁面中聲明瞭請求作用域bean,並試圖訪問它另一頁。 我能夠使用scriptlet
以及EL
訪問另一個頁面上的bean,但是如果使用jsp;getProperty
,它會得到一個異常。 下面是這兩個頁面的代碼。訪問請求作用域bean
PageScope.jsp(第一頁):
<jsp:useBean id="taskBean" class="com.mybean.TaskBean" scope="request" />
<jsp:setProperty name="taskBean" property="multiplier" value="55" />
<jsp:setProperty name="taskBean" property="multiplicand" value="<%= dd %>" />
<%
System.out.println("Forwarding request to other page.");
RequestDispatcher dispatcher = request.getRequestDispatcher("RequestScope.jsp");
dispatcher.forward(request, response);
%>
RequestScope.jsp(另一頁):
<%
out.println("Accessing request scoped bean");
TaskBean taskBean = (TaskBean) request.getAttribute("taskBean");
out.println(taskBean.getMultiplier());
%>
${taskBean.multiplier}
<jsp:getProperty name="taskBean" property="multiplier" />
//THE ABOVE LINE THROWS EXCEPTION.
是否有可能使用JSP訪問bean:的getProperty。請讓我知道我錯了。 謝謝。
編輯: 以下是堆棧跟蹤。
org.apache.jasper.JasperException: file:/RequestScope.jsp(28,4) jsp:getProperty for bean with name 'taskBean'. Name was not previously introduced as per JSP.5.3
org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1104)
org.apache.jasper.compiler.Node$GetProperty.accept(Node.java:1126)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2376)
org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2428)
org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2434)
org.apache.jasper.compiler.Node$Root.accept(Node.java:475)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2376)
org.apache.jasper.compiler.Generator.generate(Generator.java:3489)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:250)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:373)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:353)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:340)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:646)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:357)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
org.apache.jsp.PageScope_jsp._jspService(PageScope_jsp.java:109)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
都調用JSP作爲同一請求的一部分bean的屬性? – leonbloy 2013-04-09 16:31:34
@leonbloy是的,請參閱PageScope.jsp的RequestDispatcher語法 – 2013-04-09 16:34:51
oops,對不起....在異常堆棧跟蹤中沒有用處? – leonbloy 2013-04-09 16:47:44