Question

我写了一个简单的计数器servlet应用程序来显示访问页面的用户数量。我想在jsp页面中显示这个结果。但是我怎么能这样做呢？以下是我的代码...

public class ServerClass extends HttpServlet {
int counter = 0;
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    response.setContentType("text/html;charset=UTF-8");
  PrintWriter out = response.getWriter();
int local_count;
synchronized(this) {
local_count = ++counter;
}
out.println("Since loading, this servlet has been accessed " +
        local_count + " times.");
out.close();
    }
}

Answer 1

如果您提出doGet请求，则应该实施doPost（和POST。除非从normal servlet doXxx methods之一调用processRequest，否则无法调用// Convention would name the variable localCount, not local_count. request.setAttribute("count", local_count);。

通过请求属性公开变量：

getServletContext()
    .getRequestDispatcher("/WEB-INF/showCount.jsp")
    .forward(request, response);

转发到JSP：

Since loading, this servlet has been accessed ${count} times.

使用JSP EL（表达式语言）显示属性：

web.xml

如果未显示本地计数变量，请确保为最新的servlet修订版配置了{{1}}文件。

如何在jsp页面中显示servlet结果？

1 个答案: