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我有简单的servlet将参数传递给jsp文件。 下面是代码:在JSP中未评估EL表达式
String userName = request.getParameter("userName");
HttpSession session = request.getSession();
session.setAttribute("userName", userName);
request.getRequestDispatcher("welcome.jsp").forward(request, response);
页的welcome.jsp包含:
<body>
<h3 align="center">Welcome ${userName}!!!</h3>
<a href="index.jsp">go back</a>
</body>
中的index.jsp:
<form method="post" action="check">
Name <input type="text" name="userName" >
<input type="submit" value="submit">
</form>
最后的web.xml:
<servlet>
<servlet-name>check</servlet-name>
<display-name>check</display-name>
<description></description>
<servlet-class>MyServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>check</servlet-name>
<url-pattern>/check</url-pattern>
</servlet-mapping>
问题在于参数呃不会传递给welcome.jsp。我仍然看到
$ USERNAME
问题是什么?请帮帮我。