为什么我在 IntelliJ IDEA Ultimate 2020.2 的 JSP&servlets 中收到 404 found error?

Why i am getting 404 found error in JSP&servlets in IntelliJ IDEA Ultimate 2020.2?

我正在 jsp 中创建简单的登录 Web 应用程序,并在 IntelliJ IDEA Ultimate 2020.2 中创建 servlet。

以下是我的index.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Calculator</title>
</head>
<body>
<form method="post" action="/LoginServlet">
    UerName:<input type="text" name="t1"><br>
    Password:<input type="text" name="t2"><br>
    <input type="submit" value="Ok"><br>
</form>
</body>
</html>

这是我的 servlet。它位于 src->main->java->francis

@WebServlet(name = "LoginServlet")
public class LoginServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        PrintWriter out = response.getWriter();
        out.println("Welcome.....");
    }
}

Web.xml 是

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">

    <servlet>
        <servlet-name>LoginServlet</servlet-name>
        <servlet-class>francis.LoginServlet</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>LoginServlet</servlet-name>
        <url-pattern>/LoginServlet</url-pattern>
    </servlet-mapping>

</web-app>

但是输出屏幕是...

请帮助我。提前致谢

替换

<form method="post" action="/LoginServlet">

<form method="post" action="LoginServlet">

将自动翻译成 the-context-path/LoginServlet。请注意,您放入 action 属性的路径是相对于上下文路径的。