我正在尝试使用servlet构建一个Web应用程序，但面对这个问题，我只是在servlet类中设置我的数据并使用$ {}在jsp中进行处理
JSP --->
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<c:out value="${data}"/>
<%= request.getAttribute("data") %>
</body>
</html>Servlet类：
public class Naveen extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
Object data = "Some data, can be a String or a Javabean";
request.setAttribute( "data", data );
RequestDispatcher rd = request.getRequestDispatcher( "/new.jsp" );
rd.forward( request, response );
response.getWriter().append( "Served at:" ).append( request.getContextPath() );
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet( request, response );
}
}
你需要在requestScope中使用c:out
<c:out value="${requestScope.data}">
有关详细示例，请参阅：https://www.journaldev.com/2090/jstl-tutorial-jstl-tags-example
我想你直接打电话给/new.jsp！要获得价值，您需要调用servlet URL。这将解决您的问题，因为在servlet请求被发送到具有属性值/new.jsp的data。
在你的jsp文件中试试这个：添加isELIgnored = false
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1" isELIgnored="false" %>
默认情况下，此属性应处于启用状态。您可以将其添加到每个jsp页面，以使EL（表达式语言）处理成功。