我正在尝试按照此处的教程
https://tcserver.docs.pivotal.io/3x/docs-tcserver/topics/tutwebapp.html#tutwebapp-ant-buildfile虽然 jsp 部分工作正常，但我在 java servlet 部分得到 404。这是我的相关文件和目录结构。有人可以指出我做错了什么吗？
(base) $ tree -r
.
└── helloworld
├── work
│ ├── index.html
│ ├── images
│ │ └── Pivotal_Logo.png
│ ├── hello_world_jsp.jsp
│ └── WEB-INF
│ ├── web.xml
│ └── classes
│ └── examples
│ └── Hello_World_Java.class
├── web
│ ├── index.html
│ ├── images
│ │ └── Pivotal_Logo.png
│ ├── hello_world_jsp.jsp
│ └── WEB-INF
│ └── web.xml
├── src
│ └── examples
│ └── Hello_World_Java.java
├── helloworld.iml
├── dist
│ └── hello_custom_build.war
└── build.xml
12 directories, 13 files
web.xml
<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
version="2.4">
<display-name>HelloWorld Application</display-name>
<description>
This is a simple web application with a source code organization
based on the recommendations of the Application Developer's Guide.
</description>
<servlet>
<servlet-name>HelloServlet</servlet-name>
<servlet-class>examples.Hello_World_Java</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>HelloServlet</servlet-name>
<url-pattern>/Hello_World_Java</url-pattern>
</servlet-mapping>
</web-app>
index.html
<html>
<head>
<title>Sample "Hello, World" Application</title>
</head>
<body bgcolor=white>
<table border="0" cellpadding="10">
<tr>
<td>
<img src="images/Pivotal_Logo.png">
</td>
<td>
<h1>Sample "Hello, World" Application</h1>
</td>
</tr>
</table>
<p>This is the home page for the HelloWorld Web application. </p>
<p>To prove that they work, you can execute either of the following links:
<ul>
<li>To a JSP page: <a href="hello_world_jsp.jsp">Hello JSP Page</a>.
<li>To a servlet: <a href="/Hello_World_Java">Hello via Java app</a>.
</ul>
</body>
</html>
Hello_World_Java 封装示例；
导入java.io.IOException； 导入 java.io.PrintWriter; 导入 javax.servlet.ServletException; 导入 javax.servlet.http.HttpServlet; 导入 javax.servlet.http.HttpServletRequest; 导入 javax.servlet.http.HttpServletResponse;
public final class Hello_World_Java extends HttpServlet {
/**
* Respond to a GET request for the content produced by
* this servlet.
*
* @param request The servlet request we are processing
* @param response The servlet response we are producing
*
* @exception IOException if an input/output error occurs
* @exception ServletException if a servlet error occurs
*/
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException {
response.setContentType("text/html");
PrintWriter writer = response.getWriter();
writer.println("<html>");
writer.println("<head>");
writer.println("<title>Sample Application Servlet Page</title>");
writer.println("</head>");
writer.println("<body bgcolor=white>");
writer.println("<table border=\"0\" cellpadding=\"10\">");
writer.println("<tr>");
writer.println("<td>");
writer.println("<img src=\"images/Pivotal_Logo.png\">");
writer.println("</td>");
writer.println("<td>");
writer.println("<h1>Sample Application Servlet</h1>");
writer.println("</td>");
writer.println("</tr>");
writer.println("</table>");
writer.println("This is the output of a servlet that is part of");
writer.println("the Hello, World application.");
writer.println("</body>");
writer.println("</html>");
}
}
根据您的评论，您似乎缺少网址中的应用程序名称。应该是这样的：
本地主机：8080/[应用程序名称]/Hello_World_Java
您必须提供 Hello_World_Java.java 包中缺少一个组件
@WebServlet(“/Hello_World_Java”)
公开课声明上方
这是因为您在 <a href> 标记中请求
/Hello_World_Java但您没有在 java 文件中给出 servlet 名称。