scriptlet

What is the difference between <%! %> and <% %> in JSP?

由 混江龙づ霸主 提交于 2019-11-30 08:33:51
What is the difference between <%! %> and <% %> in JSP? <%! %> are JSP Declaration tags while <% %> are JSP Scriptlet tags . Any code you put in scriptlets gets put in the JSPs _jspService() method when it's compiled (the analogue of a Servlet's doGet , doPost ,... methods). This is what you'd usually write your Java code in. But what if you want to declare new methods in your JSP class or declare instance variables? That's when you'd use the declaration tags. Any thing you put in there gets put into the JSP, outside of the _jspService() method. 来源： https://stackoverflow.com/questions/5508753

Using if-else in JSP

由 橙三吉。 提交于 2019-11-30 07:28:27
I'm using the following code to print the name of the user on the browser: <body> <form> <h1>Hello! I'm duke! What's you name?</h1> <input type="text" name="user"><br><br> <input type="submit" value="submit">     <input type="reset"> </form> <%String user=request.getParameter("user"); %> <%if(user == null || user.length() == 0){ out.print("I see! You don't have a name.. well.. Hello no name"); } else {%> <%@ include file="response.jsp" %> <% } %> </body> response.jsp: <body> <h1>Hello</h1> <%= request.getParameter("user") %> body> Every time I execute it, the message I see! You don't have a

iterating over Enum constants in JSP

由 人盡茶涼 提交于 2019-11-30 02:07:56
问题 I have an Enum like this package com.example; public enum CoverageEnum { COUNTRY, REGIONAL, COUNTY } I would like to iterate over these constants in JSP without using scriptlet code. I know I can do it with scriptlet code like this: <c:forEach var="type" items="<%= com.example.CoverageEnum.values() %>"> ${type} </c:forEach> But can I achieve the same thing without scriptlets? Cheers, Don 回答1: If you're using Spring MVC, you can accomplish your goal with the following syntactic blessing: <form

What is the difference between <%! %> and <% %> in JSP?

由 人盡茶涼 提交于 2019-11-29 11:56:57
问题 What is the difference between <%! %> and <% %> in JSP? 回答1: <%! %> are JSP Declaration tags while <% %> are JSP Scriptlet tags. Any code you put in scriptlets gets put in the JSPs _jspService() method when it's compiled (the analogue of a Servlet's doGet , doPost ,... methods). This is what you'd usually write your Java code in. But what if you want to declare new methods in your JSP class or declare instance variables? That's when you'd use the declaration tags. Any thing you put in there

Using if-else in JSP

由 試著忘記壹切 提交于 2019-11-29 08:50:36
问题 I'm using the following code to print the name of the user on the browser: <body> <form> <h1>Hello! I'm duke! What's you name?</h1> <input type="text" name="user"><br><br> <input type="submit" value="submit">     <input type="reset"> </form> <%String user=request.getParameter("user"); %> <%if(user == null || user.length() == 0){ out.print("I see! You don't have a name.. well.. Hello no name"); } else {%> <%@ include file="response.jsp" %> <% } %> </body> response.jsp: <body> <h1>Hello</h1> <%

Accessing a jstl variable inside a scriptlet

由 不问归期 提交于 2019-11-28 06:16:45
The following code causes an error: <c:set var="test" value="test1"/> <% String resp = "abc"; resp = resp + ${test}; //in this line I got an Exception. out.println(resp); %> Don't I use the expression language "${test}" in the scriptlet.why? Aniket Kulkarni JSTL variables are actually attributes, and by default are scoped at the page context level. As a result, if you need to access a JSTL variable value in a scriptlet, you can do so by calling the getAttribute() method on the appropriately scoped object (usually pageContext and request). resp = resp + (String)pageContext.getAttribute("test");

How to pass java variables from scriptlets to c:when expression in jstl?

由 我的梦境 提交于 2019-11-28 04:16:42
问题 what is a proper way to use variables from scriptlets in jstl? I don't know what is wrong in my code: <% boolean a = true; boolean b = false; %> <c:choose> <c:when test="${a}"> <c:set var="x" value="It's true"/> </c:when> <c:when test="${b}"> <c:set var="x" value="It's false"/> </c:when> </c:choose> It looks like it doesn't go into the whole block. 回答1: Variables in scriptlets cannot be seen in JSTL because Expression Language, the stuff between ${} used in JSTL, will look for attributes in

Creating Array using JSTL or EL

由 江枫思渺然 提交于 2019-11-27 20:06:44
I'm working on a web application using Java and its frameworks(Spring 3.1.1). And I'm trying to avoid using scriptlets as much as possible, however I can't find a way other than this to define an array: <% String[] alphabet = {"A", "B", "C", ... , "Z"}; pageContext.setAttribute("alphabet", alphabet); %> After setting pageContext attribute, I can use it with ${alphabet} . But I want to know, is it possible to use plain JSTL/EL to create an array? UPDATE: I'm using this array to create links. For example, if user clicks 'S', a list of employees whose first name starts with 'S' comes. So, instead

Use EL ${XY} directly in scriptlet <% XY %>

由 女生的网名这么多〃 提交于 2019-11-27 09:45:54
In my project I've to asign a variable every time the JSP is being opened. I tried it with scriptlets <% %> in JSP and EL ${} which gives the variable back. But it seems not working. <% String korrekteAntwort=${frage.korrekteAntwort};%> <%session.setAttribute("korrekteAntwort", korrekteAntwort);%> There is an error after korrekteAntwort=${} , Isn't it possible to asign directly an variable from EL in a scriptlet? BalusC You're mixing scriptlets and EL and expecting that they run "in sync". That just won't work. The one is an oldschool way of writing JSPs and the other is a modern way of

I can pass a variable from a JSP scriptlet to JSTL but not from JSTL to a JSP scriptlet without an error

由 a 夏天 提交于 2019-11-27 02:52:32
The following code causes an error: <c:set var="test" value="test1"/> <% String resp = "abc"; resp = resp + test; pageContext.setAttribute("resp", resp); %> <c:out value="${resp}"/> The error says "error a line 4: unknown symbol 'test'". How do I pass test from the JSTL code to the JSP scriptlet? Scripts are raw java embedded in the page code, and if you declare variables in your scripts, then they become local variables embedded in the page. In contrast, JSTL works entirely with scoped attributes, either at page , request or session scope. You need to rework your scriptlet to fish test out as
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