jsp-tags | 易学教程

Why is <taglib> giving me a problem in my web.xml?

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问题 I have this web.xml <?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"> <display-name>jsp-tags</display-name> <taglib> <taglib-uri>mytags</taglib-uri> <taglib-location>/WEB-INF/mytaglib.tld</taglib-location>

declare JSP taglib directives in web.xml

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I seem to remember reading that it's possible to declare taglib directives such as: <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> in web.xml. This eliminates the need to duplicate this directive in every JSP file where the taglib is used. Could someone tell me how these directives can be added to web.xml? The taglib element in web.xml serves a different purpose to the taglib directive which you have above. As David said, the taglib directive is required on each page. If you have many pages which use common taglibs, you can shortcut this by putting the taglib directives into

extending spring form tag library attributes

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I'm using Spring's form tag library in a Spring MVC application that I am developing. The company I am working for has implemented some company-wide policies based on the definition of custom attributes for certain tags. For instance, by default (though the inclusion of a standard javascript file) all tags have their values automatically converted to upper case. In order to disable this one would define their tag with a custom attribute in the following way: <input type="text" uppercase="false" /> The problem is that the addition of these custom attributes to a spring:form tag causes an error

Java constants in JSP [duplicate]

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问题 This question already has answers here : How to reference constants in EL? (12 answers) Closed 3 years ago . I have a class that defines the names of various constants, e.g. class Constants { public static final String ATTR_CURRENT_USER = "current.user"; } I would like to use these constants within a JSP without using Scriptlet code such as: <%@ page import="com.example.Constants" %> <%= Constants.ATTR_CURRENT_USER %> There appears to be a tag in the Apache unstandard taglib that provides

Using JavaScript within a JSP tag

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问题 I've seen this question regading the importing of js-files related to the tag content itself. I have a similar problem, here I have a jsp tag that generates some HTML and has a generic js-implementation that handles the behavior of this HTML. Furthermore I need to write some initialization statements, so I can use it afterwards through JavaScript. To be possible to use this "handler" within my JavaScript, it should be somehow accessible. The question is... Is it Ok to write inline <script>

JSTL if tag for equal strings

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I've got a variable from an object on my JSP page: <%= ansokanInfo.getPSystem() %> The value of the variable is NAT which is correct and I want to apply certain page elements for this value. How do I use a tag to know the case? I tried something like <c:if test = "${ansokanInfo.getPSystem() == 'NAT'}"> process </c:if> But the above doesn't display anything. How should I do it? Or can I just as well use scriptlets i.e. <% if (ansokanInfo.getPSystem().equals("NAT"){ %> process <% } %> Thanks for any answer or comment. Adam Gent Try: <c:if test = "${ansokanInfo.PSystem == 'NAT'}"> JSP/Servlet 2.4

The superclass “javax.servlet.http.HttpServlet” was not found on the Java Build Path

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I'm a beginner and learning spring and hibernate (utilizing maven in project)and came across this problem and got stuck here. tried finding solution but ended up no where. Please help. thanks a lot Error: "Can not find the tag library descriptor for " http://java.sun.com/jsp/jstl/core " Code: <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> <%@ taglib uri="http://www.springframework.org/tags" prefix="spring" %> <%@ taglib uri="http://www.springframework.org/tags/form" prefix="form" %> Tried the solutions given in The superclass "javax.servlet.http.HttpServlet" was not found on

How to clear the httpsession, if the user close the browser in java

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问题 I am trying to clear the HttpSession if the consumer close the browser window. I dont know how to do it, Please help me anyone Thanks & Regards Chakri 回答1: If you could get the browser to (reliably) notify the server that the user had closed the window, then the server could call session.invalidate() as per the original Answer provided by ejay_francisco. The difficulty is getting the notification to happen reliably. There are various ways to detect the window close; e.g. as covered by these

JSP/servlet read parameters from properties file?

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问题 My JSP pages need to display different information depending on which environment they're in (dev, production, sandbox, etc). I want to have a properties file for each of these environments that contain all the parameters they might need. How can I reference the properties from this file in a JSP page? My thoughts are: Have a servlet feed the properties in the form of a model object to all JSP pages so I can reference them like ${properties.propertyName} Somehow reference this property file

declare JSP taglib directives in web.xml

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问题 I seem to remember reading that it's possible to declare taglib directives such as: <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> in web.xml. This eliminates the need to duplicate this directive in every JSP file where the taglib is used. Could someone tell me how these directives can be added to web.xml? 回答1: The taglib element in web.xml serves a different purpose to the taglib directive which you have above. As David said, the taglib directive is required on each page.