Question

我有一个下一个问题。在 jsp 页面中, 我为两个用户( 教师和学生) 使用菜单, 因为他们依赖角色, 我从菜单文件中选择应该包括的角色。像这样的 Smth

<c:if test="${role eq  Tutor }">
                <c:import url="/page/menuForTutor.html" charEncoding="UTF-8"/>
</c:if>
<c:if test="${role eq  Student }">
             <c:import url="/page/menuForStudent.html" charEncoding="UTF-8"/>
</c:if>

我应该使用用户描述符

public class MenuTag extends TagSupport{

    private static final String PARAM_ROLE_TUTOR = "Tutor";
    private static final String PARAM_ROLE_STUDENT = "Student";

    @Override
    public int doStartTag(){
        HttpServletRequest request = (HttpServletRequest)pageContext.
                                                   getRequest();
        HttpSession session = request.getSession();
        String role = (String) session.getAttribute("role");
        if (PARAM_ROLE_TUTOR.equals(role)){
            try {
                pageContext.getOut().print("<c:import url="/page/menuForTutor.html" charEncoding="UTF-8"/>");
            } catch (IOException ex) {
                Logger.getLogger(MenuTag.class.getName()).log(Level.SEVERE, null, ex);
            }
        } else if(PARAM_ROLE_STUDENT.equals(role)){
        }
        return SKIP_BODY;
    }       
}

当我使用混蛋时,我看到我做所有步骤,但老师的菜单没有显示在jsp上。有什么想法吗?

Answer 1

我想会话("作用")是另一个代码部分设定的!

设置 JspWriter 出 = pageContext.get out ();

类似代码中跟随的东西

JspFactory  factory     = JspFactory.getDefaultFactory();
PageContext pageContext = factory.getPageContext(
this,
request,
response,
null,  // errorPageURL
false, // needsSession
JspWriter.DEFAULT_BUFFER,
true   // autoFlush
);

    ....
            JspWriter   out     = pageContext.getOut();
            HttpSession session = request.getSession();
            String role = (String) session.getAttribute("role");
            if (PARAM_ROLE_TUTOR.equals(role)){
                try {
                    out.println("<c:import url="/page/menuForTutor.html" charEncoding="UTF-8"/>");
                    out.flush();
                    // Evaluate the body if there is one
                    return EVAL_BODY_BUFFERED;
.......

else return SKIP_BODY;

EDIT看到代码: 你必须“返回 EVAL_BODY_BUFFERED;”

友情链接