jsp

问题 This question already has answers here : What is the need of JSF, when UI can be achieved with JavaScript libraries such as jQuery and AngularJS (8 answers) What is the difference between creating JSF pages with .jsp or .xhtml or .jsf extension (2 answers) Closed 4 days ago . Im begginer at programming and im trying to create one simple site for booking movie tickets. So i created JSP pages for admin home page, user home page, login page and register page. I just want to know, because I want

问题 There are countless examples out there for my problem, I know, but I went through a lot of them and can't figure out where my mistake is. I am iterating over an ArrayList(TestSzenario). The class TestSzenario contains a String Variable called name with proper getters and setters. Here's my code: <td><select name="selectSzenario" id="selectSzenario" size="1"> <c:forEach items="<%=testszenario.getSzenariosForSummary() %>" var="szenario"> <option>${szenario.name}</option> </c:forEach></select><

问题 Without using scriptlets, what's the correct way for doing date arithmetic in JSP? Here are examples what I'm trying to do: Get current year (YYYY) Subtract current year by one to get previous year (YYYY) Thanks! 回答1: Use <jsp:useBean> to construct new Date. Use JSTL <fmt:formatDate> to get the year out of it. Use EL to substract it. <%@taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %> <jsp:useBean id="now" class="java.util.Date" /> <fmt:formatDate var="year" value="${now}"

问题 Without using scriptlets, what's the correct way for doing date arithmetic in JSP? Here are examples what I'm trying to do: Get current year (YYYY) Subtract current year by one to get previous year (YYYY) Thanks! 回答1: Use <jsp:useBean> to construct new Date. Use JSTL <fmt:formatDate> to get the year out of it. Use EL to substract it. <%@taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %> <jsp:useBean id="now" class="java.util.Date" /> <fmt:formatDate var="year" value="${now}"

问题 I have this unusual scenario: I have a registrationVO with few properties and getter setters for that. For example city or bCity with their getter methods getCity() and getBCity() In JSP i tried to display the value of these properties using scriplets, <%=registrationVO.getCity()%> and < %=registrationVO.getBCity()%> , It works fine. But i replaced the same with expression language, ${registrationVO.city} and ${registrationVO.bCity} i got an error saying property "bCity" not found in

问题 I have this unusual scenario: I have a registrationVO with few properties and getter setters for that. For example city or bCity with their getter methods getCity() and getBCity() In JSP i tried to display the value of these properties using scriplets, <%=registrationVO.getCity()%> and < %=registrationVO.getBCity()%> , It works fine. But i replaced the same with expression language, ${registrationVO.city} and ${registrationVO.bCity} i got an error saying property "bCity" not found in

问题 Why are the "POST" and "submit" parts of this code highlighted in a different color in my IDE? Also the syntax highlighter here doesn't highlight them in same color. <c:if test="${"POST".equalsIgnoreCase(pageContext.request.method) && pageContext.request.getParameter("submit") !=null}"> </c:if> Does that mean that EL does not recognize the string and so gives me an EL syntax error? How can I solve this? 回答1: Inside the <c:if> , your test attribute is a also a string, which is set with double

问题 Why are the "POST" and "submit" parts of this code highlighted in a different color in my IDE? Also the syntax highlighter here doesn't highlight them in same color. <c:if test="${"POST".equalsIgnoreCase(pageContext.request.method) && pageContext.request.getParameter("submit") !=null}"> </c:if> Does that mean that EL does not recognize the string and so gives me an EL syntax error? How can I solve this? 回答1: Inside the <c:if> , your test attribute is a also a string, which is set with double

问题 I have a form in a jsp from which i am retrieving data to servlet via doPost method, suppose username and password now there is an empty textarea field inside the same form where i want to send the username from servlet,how do i do it? 回答1: I don't really understand your case. But there're 2 common ways to send data from servlet to JSP: Request attributes : you can use this if data is transferred along a same request. request.setAttribute("username",obj); request.getRequestDispatcher("url")

问题 I have a form in a jsp from which i am retrieving data to servlet via doPost method, suppose username and password now there is an empty textarea field inside the same form where i want to send the username from servlet,how do i do it? 回答1: I don't really understand your case. But there're 2 common ways to send data from servlet to JSP: Request attributes : you can use this if data is transferred along a same request. request.setAttribute("username",obj); request.getRequestDispatcher("url")