如何在java中设置session属性？

Question

我可以在scriptlet中设置session属性,但是当我尝试在java类中设置session属性时,它会显示错误,例如"session is not resolved".那么如何在java中设置会话？

<%String username = (String)request.getAttribute("un");
session.setAttribute("UserName", username);%>

Answer 1

通过Java类,我假设你的意思是一个Servlet类,因为在任意Java类中设置会话属性是没有意义的.你可以在你的servlet的doGet/doPost方法中做这样的事情

public void doGet(HttpServletRequest request, HttpServletResponse response) {

    HttpSession session = request.getSession();
    String username = (String)request.getAttribute("un");
    session.setAttribute("UserName", username);
}