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servlets - Java Web 应用程序：无法从 jsp 页面启动 MVC 控制器 (Servlet) 类

问题描述

我正在创建一个简单的 Java Web 应用程序“注册表单”。我正在使用以下硬件和软件：机器：Amazon Linux 2 EC2 实例。Java 版本：1.8.0_282 Maven：3.6.3 Apache Tomcat：7.0.76 Servlet：3.1.0（在 pom.xml 组 ID：javax.servlet，art​​ifactId：javax.servlet-api） 注意：我没有使用任何 IDE . 我正在使用 Linux vim 实用程序编写代码。

我按照以下步骤创建 Java Web 应用程序项目“注册表单”。

  1. 使用创建项目目录和 pom.xml
mvn archetype:generate -DgroupId=com -DartifactId=JavaWebApplication -DarchetypeArtifactId=maven-archetype-webapp -DarchetypeVersion=1.0 -DinteractiveMode=false
  1. 目录结构如下所示：
/home/ec2-user/javaProjects/JavaWebApplication
---src
------main
---------resources
---------java
------------com
---------------JavaWebApplication
------------------Beans
------------------Model
------------------Controller
---------------------guru_register.java
---------webapp
------------css
---------------myStyle.css
------------jsp
---------------register.jsp
------------WEB-INF
---------------web.xml
------------index.jsp
---pom.xml
  1. 我在 pom.xml 中添加了 servlet 依赖项
  2. 在 pom.xml、index.jsp、myStyle.css、register.jsp、guru_register.java、web.xml 中编写代码。代码如下所示。
  3. 当我执行“mvn clean package”时，它会成功构建项目。部署到 Tomcat 服务器后，它会正确显示 register.jsp 页面。填写数据并按下提交按钮后，它会抛出错误“HTTP Status 404 - /JavaWebApplication/jsp/guru_register”。我不明白为什么它在 /jsp 文件夹中查找 guru_register 页面。你能看看代码并帮助我找到问题吗？

注意：由于某些限制，我无法使用 Windows 操作系统和任何 IDE，因此我使用 Amazon Linux EC2 进行练习。谢谢！

代码：

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com</groupId>
  <artifactId>JavaWebApplication</artifactId>
  <packaging>war</packaging>
  <version>1.0-SNAPSHOT</version>
  <name>JavaWebApplication Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.13.1</version>
      <scope>test</scope>
    </dependency>
    <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>3.1.0</version>
        <scope>provided</scope>
    </dependency>
  </dependencies>
  <build>
    <finalName>JavaWebApplication</finalName>
  </build>
</project>

索引.jsp

<html>
<tittle>Java Web Application</tittle>
<header>
        <link rel="stylesheet" type="text/css" href="css/myStyle.css">
</header>
<body>
        <ul>
                <li><a href="http://23.20.111.62:8080/JavaWebApplication/jsp/register.jsp" class="active">SignUp</a></li>
                <li><a href="#news">SignIn</a></li>
        </ul>
</body>
</html>

我的样式.css

ul {
        list-style-type: none;
        margin: 0;
        padding: 0;
        overflow: hidden;
        background-color: #333;
}
 
li {
        float: left;
}
 
li a {
        display: inline-block;
        color: white;
        text-align: center;
        padding: 14px 16px;
        text-decoration: none;
}
 
li a:hover {
        background-color: #111;
}
 
.active {
        background-color: red;
}

注册.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Registration Form</title>
</head>
<body>
<h1>Register Here</h1>
<form method="post" action="guru_register">
                        <table style="with: 50%">
                                <tr>
                                        <td>First Name</td>
                                        <td><input type="text" name="first_name" /></td>
                                </tr>
                                <tr>
                                        <td>Last Name</td>
                                        <td><input type="text" name="last_name" /></td>
                                </tr>
                                <tr>
                                        <td>UserName</td>
                                        <td><input type="text" name="username" /></td>
                                </tr>
                                        <tr>
                                        <td>Password</td>
                                        <td><input type="password" name="password" /></td>
                                </tr>
                                <tr>
                                        <td>Address</td>
                                        <td><input type="text" name="address" /></td>
                                </tr>
                                <tr>
                                        <td>Contact No</td>
                                        <td><input type="text" name="contact" /></td>
                                </tr></table>
                        <input type="submit" value="Submit" /></form>
</body>
</html>

guru_register.java

package com.JavaWebApplication.Controller;
 
import java.io.IOException;
 
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
/**
 * Servlet implementation class guru_register
 */
public class guru_register extends HttpServlet {
        private static final long serialVersionUID = 1L;
 
     public guru_register() {
             super();
     }
 
   /**
   * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
   */
  protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // TODO Auto-generated method stub
    response.getWriter().append("Served at: ").append(request.getContextPath());
  }
 
 
  /**
   * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
   */
     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
                doGet(request, response);
                //PrintWriter out = response.getWriter();
                // TODO Auto-generated method stub
                String first_name = request.getParameter("first_name");
                String last_name = request.getParameter("last_name");
                String username = request.getParameter("username");
                String password = request.getParameter("password");
                String address = request.getParameter("address");
                String contact = request.getParameter("contact");
 
                System.out.println(first_name);
                System.out.println(last_name);
                System.out.println(username);
 
        }
 
}

web.xml

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >
 
<web-app>
  <servlet>
    <servlet-name>guru_register</servlet-name>
    <servlet-class>com.JavaWebApplication.Controller.guru_register</servlet-class>
  </servlet>
 
  <servlet-mapping>
    <servlet-name>guru_register</servlet-name>
    <url-pattern>/guru_register</url-pattern>
  </servlet-mapping>
 
  <display-name>Archetype Created Web Application</display-name>
</web-app>

标签： servletshttp-status-code-404

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