Go Idea when creating a new JSP project

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The new JSP page does not have the same page as Eclipse

<%== request.getscheme () + "://" +request.getservername () + ":" + request.getserverport () + path + "/ "; %>

However, when you manually add the above code, you will get an error, Workaround: Add reference Javax.servlet-api-x.x.x.jar to the project. You can refer to the links above for specific ways.

To support EL expressions, you need to reference the Jstl-1.2.jar class library, and then you can write code like this on a JSP page:

<%@ taglib Prefix="C"URI="Http://java.sun.com/jsp/jstl/core" %><C:choose>    <C:whenTest= "${not Empty Sessionscope.user}">welcome you: ${sessionscope.username}</C:when>    <c:otherwise>you are not logged in, please log in first:<formAction= "<%= path%>/login<%= path +"a "%>"method=" POST "> UserName:<inputtype= "text"name= "UserName" /><BR/>Password:<inputtype= "Password"name= "Password" /><BR/>            <inputtype= "Submit"value= "Login" />        </form>    </c:otherwise></C:choose>

Go Idea when creating a new JSP project