将数据从java传递到jsp

Question

I am working on struts and I am trying to pass a String value from a java file to a jsp page.我正在研究 struts，我试图将一个字符串值从一个 java 文件传递到一个 jsp 页面。 But I am receiving a null value.但我收到一个空值。 Please help.请帮忙。

My java code :我的Java代码：

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

public class myAction extends Action {
    public ActionForward execute(ActionMapping mapping, ActionForm form,
    HttpServletRequest request, HttpServletResponse response)
    throws IOException, ServletException {

        String s="Karthikeyan";

        request.setAttribute("s",s);

        RequestDispatcher reqDispatcher = getRequestDispatcher("first.jsp");
        reqDispatcher.forward(request,response);        

        return (mapping.findForward("success"));
    }
}

My jsp code :我的jsp代码：

<%@page contentType="text/html" pageEncoding="UTF-8"%>

<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    </head>

    <body>
        Welcome!!!!!!!!

        <%
            String s=(String)request.getAttribute("s");
            out.println("s="+s);
        %>
    </body>
</html>

My jsp output :我的jsp输出：

Welcome!!!!!!!! s=null

I wanted to know why 's' is not getting assigned.我想知道为什么 's' 没有被分配。 Help would be greatly appreciated.帮助将不胜感激。

Answer 1

Instead of doing而不是做

<%
   String s=(String)request.getAttribute("s");
   out.println("s="+s);
%>

Try to replace the whole thing with:尝试将整个内容替换为：

s=${s}

将数据从java传递到jsp

问题描述

1 个解决方案

解决方案1
0 2014-04-14 14:56:38

将数据从java传递到jsp

问题描述

1 个解决方案

解决方案1 0 2014-04-14 14:56:38

解决方案1
0 2014-04-14 14:56:38