servlet容器中的问题,两次获取servlet位置

问题描述 投票:0回答:1

我正在学习JSP / Servet,并尝试制作一个简单的Servlet控制器。

这是我的项目结构:

enter image description here

test是主页,用户可以输入自己的爱好。确认页面,将向用户确认详细信息。它可以选择返回并编辑信息或将信息提交到process.jsp页面。

Test.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html>
<html lang="eu">
    <head>
        <meta charset="UTF-8">
        <title>Simple web page</title>
    </head>
    <body>
    <p>
    This is a simple HTML page that has a form in it.
        <form action="ch2/servletController/Controller">
        <p>
            Hobby:<input type="text" name="hobby" value="${param.hobby}">
            <input type="submit" name ="confirmButton" value="confirm">
        </form>

    </body>
</html>

Confirm.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Confirm Page</title>
</head>
<body>
    <p>
        The value of the hobby that was sent to this page is <strong>${param.hobby} </strong>.
    <p>
    <form action="ch2/servletController/Controller">
    <p>
        If there is any error, please click the edit button and 
            to process press the Submit button <br>
        <input type="hidden" name="hobby" value="${param.hobby}">
        <input type="submit" name="editButton" value="Edit">
        <input type="submit" name="submit" value="submit">
    </form>
</body>
</html>

Process.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
    <!DOCTYPE html>
    <html>
    <head>
    <meta charset="ISO-8859-1">
    <title>Process Page</title>
    </head>
    <body>
    Thank you for your information, Your hobby of <strong>${param.hobby} </strong> will
    be added to our records, eventually.
    </body>
    </html>

Controller.java

package ch2.servletController;

import java.io.IOException;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/Controller")
public class Controller extends HttpServlet {
    private static final long serialVersionUID = 1L;


    protected void doGet(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException
    {
        String address;
        if(request.getParameter("submit") != null)
        {
            address = "Process.jsp";
        }
        else if ( request.getParameter("editButton") != null)
        {
            address = "test.jsp";
        }
        else
        {
            address = "/Confirm.jsp";
        }

        RequestDispatcher dispatcher = 
                request.getRequestDispatcher(address);
        dispatcher.forward ( request, response);
    }
}

test.jsp输出:enter image description here

点击确认:enter image description here

但是我无法返回到test.jsp页面和Process.jsp页面:

这是单击confirm.jsp页面的编辑按钮时出现的错误。enter image description here

我注意到我的路径不正确,甚至servlet位置也在重复。是否可以解释为什么servlet位置重复,以及如何通过控制器成功导航到test.jsp?

非常感谢您的提前反馈。

jsp servlets
1个回答
0
投票

Confirm.jsp中的表格上,您使用的是相对URL:ch2/servletController/Controller。 URL与服务请求的资源的位置(浏览器的地址栏中的位置)http://localhost:9191/SampleProject/ch/servletController/Controller相关。

您应该在您的Confirm.jsp上使用绝对URL,使用:

<form action="${request.contextPath}/ch2/servletController/Controller">
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