java - Servlet 在 Eclipse 中运行时显示 404 错误

Question

我是 servlet 编程的新手。我的 tomcat 在 eclipse 和主系统中都运行良好。当我尝试运行 servlet 时，它显示 404 错误。我使用动态 Web 项目制作了我的 servlet。我的代码是:

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

public class amar extends HttpServlet {
private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest request, HttpServletResponse  response) throws  ServletException, IOException {

}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    response.getWriter().println("Hello friend!");
    response.getStatus();
}

}

请帮我解决这个问题。我的 web.xml 是:

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"     xmlns="http://xmlns.jcp.org/xml/ns/javaee"   xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org  /xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
<display-name>first servlet</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</web-app>

Answer 1

在web.xml中添加servlet的映射。

<servlet>
    <servlet-name>amar </servlet-name>  // name of servlet
    <servlet-class>packagename.amar </servlet-class> //packagename.class name
    </servlet>  

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

从浏览器运行它 localhost:8080/项目名/amar