jstl 표현 방법에 대해 질문드립니다.

Question

userList에 담겨있는 id값들이 세션id로 담겨져있는 상황이거든요.근데 이것을 jsp에서 세션값으로 가져와야하는 상황입니다.2. ">1번과 2번 모두 표현이 되지 않고있는데사용 방법에 대해 답변을 주시면 감사하겠습니다.

더미 · Answer

Let me help you access session attributes in JSP. Here's how to properly handle session values in your case:Basic Session AccessTo access a list stored in the session, you have two main approaches:*Using EL (Expression Language)*```jsp ```*Using Java Code*```jsp<%List userList = (List)session.getAttribute("userList");for(User user : userList) {%> <%}%>```Setting Session ValuesBefore accessing the values, make sure to properly set them in your servlet or controller[1]:```java// Store in sessionList userList = getUserList(); // Your method to get userssession.setAttribute("userList", userList);```Best Practices1. *Use JSTL with EL*```jsp<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> ${user.id}```2. *Check for Null Values*```jsp ${user.id} ```3. *Accessing Individual Session Attributes*[2]```jsp${sessionScope.attributeName}```Your original approaches had some issues:- ${sessionScope.list.id} is incorrect because list is your loop variable, not a session attribute- session.getSession() is incorrect syntax - use session.getAttribute() insteadRemember that session attributes are available across all JSPs and servlets within the same session scope[1][2]. The session scope is maintained per user/browser session, not globally across all users[7].Citations:[1] https://coderanch.com/t/282213/java/Session-scope-jsp-page[2] https://struts.apache.org/core-developers/accessing-application-session-request-objects[3] https://stackoverflow.com/questions/56624504/how-may-i-access-elements-in-a-session-attribute-arraylistobjects-in-jsp[4] https://stackoverflow.com/questions/5926664/accessing-data-from-session-scoped-beans-in-jsp-files[5] https://community.sap.com/t5/crm-and-cx-questions/unable-to-access-session-attribute-in-jstl/qaq-p/11979226[6] https://community.spiceworks.com/t/passing-a-list-object-from-jsp-to-a-servlet/920060[7] https://coderanch.com/t/528090/java/jsp-session-scope-List-values[8] https://coderanch.com/t/293396/java/Iterating-list-session[9] https://liferay.dev/ask/questions/question/55045930

밍코밍 · Answer

세션에 값 담을때 session.setSession()이 아니라 setAttribute()아닌가요? 그리고 List<User> userList 의 user.id가 세션 key값이라는 말씀이신거 같은데 JSP상에서 user.id 값을 하드코딩해보고 ( ex: user.id &#61; test 일경우 , ${sessionScope.test} ) 세션값이 정상적으로 나온다면 c:forEach구문의 var 변수값이 세션스코프 key값으로 못읽는것이니 jstl문법 확인해보시고 맞춰서 다시해보시면될것같네요

나땅 · Answer

${sessionScope[list.id]}이렇게 한 번 해보세요 전에 이런 방식으로 구한한 경험이있어요

jstl 표현 방법에 대해 질문드립니다.

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