Question

我现在正在学习sevlets并且遇到了问题。我试图制作＃34;欢迎页面＆＃34; （index.jsp）你可以选择下一页加载，然后我使用计算器页面（calculator.jsp），当我按下提交时我得到这个

但我希望得到结果页面（calculatorResult.jsp）。

当我使用calculator.jsp作为index.jsp（没有＆＃34;欢迎页面＆＃34;）一切正常。

我的servlet代码。

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet("/calculator")
public class CalculatorServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        int number1 = Integer.parseInt(req.getParameter("no1"));
        int number2 = Integer.parseInt(req.getParameter("no2"));
        String operation = req.getParameter("operation");
        int result = 0;
        if (operation.equals("plus")) {
            result = number1 + number2;
        } else if (operation.equals("minus")) {
            result = number1 - number2;
        }
        req.setAttribute("result", Integer.valueOf(result));
        req.getRequestDispatcher("/calculatorResult.jsp").forward(req, resp);

    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}

的index.jsp

<html>
<head>
    <title>Hello</title>
</head>
<body>
<div style="text-align: center">
    <form>
        <input type="button" value="Calculator" onClick='location.href="calculator.jsp"'>
    </form>
</div>
</a>
</body>
</html>

calculator.jsp

<html>
<div style="text-align: center;">
    <br>
    <br>
    <br>
    <form method="get" action="CalculatorServlet">
        Number 1: <input type="number" name="no1"> <br>
        Number 2: <input type="number" name="no2"> <br>
        Operator:
        <select name="operation">
            <option value="plus">+</option>
            <option value="minus">-</option>
        </select>
        <br>
        <input type="submit" value="Calculate">
    </form>
</div>
</body>
</html>

calculatorResult.jsp

<html>
<head>
    <title>Result</title>
</head>
<body>
<h1>Result: ${result}</h1>
<br>
<a href="calculator.jsp">Back to calculator</a>
</body>
</html>

请帮我解决这个问题。

HTTP状态404 - tomcat 8.5.4

0 个答案: