HTTP状态404 - servlet jsp [重复]

Question

所以我创建了新的 Maven 模块。我使用“maven-archetype-webapp”来创建它。当我在 index.jsp 中执行普通文本时，一切正常。但我也想做servlet。

我将很快写下我是如何创建它的。我右键单击我的模块和新建-> Servlet。 Java包：pl.marek，类名：MyServlet，后来我选择了“doPost”和“doGet”。这是我的文件的样子：

index.jsp

<%@page import="java.util.Date"%>
<%@page import="pl.marek.countriesmapper.reader.*" %>
<%@page import="pl.marek.countriesmapper.preparer.*" %>
<%@page import="pl.marek.countriesmapper.country.*" %>
<%@ page language="java" contentType="text/html; charset=US-ASCII"
    pageEncoding="US-ASCII"%>
<!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=US-ASCII">
<title>Hello</title>
</head>
<body>
<form action="MyServlet">
    Please enter your Username:  <input type="text" name="username" size="20px"> <br>
    Please enter your Password:  <input type="text" name="password" size="20px"> <br><br>
<input type="submit" value="submit">
</form>
</body>
</html>

MyServlet.java

package pl.marek;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class MyServlet
 */
public class MyServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
    /**
     * @see HttpServlet#HttpServlet()
     */
    public MyServlet() {
        super();
        // TODO Auto-generated constructor stub
    }
    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        PrintWriter out = response.getWriter();
        out.println (
                  "<!DOCTYPE html PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\" +" +
                      "http://www.w3.org/TR/html4/loose.dtd\">\n" +
                  "<html> \n" +
                    "<head> \n" +
                      "<meta http-equiv=\"Content-Type\" content=\"text/html; " +
                        "charset=ISO-8859-1\"> \n" +
                      "<title> Crunchify.com JSP Servlet Example  </title> \n" +
                    "</head> \n" +
                    "<body> <div align='center'> \n" +
                      "<style= \"font-size=\"12px\" color='black'\"" + "\">" +
                        "Username: " + username + " <br> " +
                        "Password: " + password +
                    "</font></body> \n" +
                  "</html>"
                );     
        }
    }
    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        doGet(request, response);
    }
}

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>
  <display-name>Archetype Created Web Application</display-name>
  <servlet>
      <servlet-name>MyServlet</servlet-name>
      <display-name>MyServlet</display-name>
      <description></description>
      <servlet-class>pl.marek.MyServlet</servlet-class>
  </servlet>
  <servlet-mapping>
      <servlet-name>MyServlet</servlet-name>
      <url-pattern>MyServlet</url-pattern>
  </servlet-mapping>
</web-app>

这是我的项目的照片：

当我点击提交时，我有地址：localhost:8080/WebAplication/MyServlet?username=test123&password=test321

但在网页上我有：

HTTP Status 404 -

type Status report

message

description The requested resource is not available.
Apache Tomcat/7.0.47

也许有人知道我做错了什么？ ：/

@编辑

我在 web.xml 中删除了“/”，现在我有了这个：

HTTP Status 500 - Error instantiating servlet class pl.marek.MyServlet

错误 500 已解决，但我仍然有状态 404：/

@edit2

我做了 SaviNuclear 的内容，但仍然出现 404 错误：/

@edit3

问题解决了。我必须创建 src/java 而不是 src/resources。

Answer 1

在您的表单操作中添加 / 以便它更改为 /MyServlet。

Answer 2

在您的 servlet 中存在错误，因此请删除行号 44 处的右括号 }，然后重新编译您的 servlet 以获得正确的输出。