如何编写 Hello world servlet 程序 [关闭]

Question

这是我的 Helloworld 课程

 package java4s;

    import java.io.IOException;
    import java.io.PrintWriter;

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

    /**
     * Servlet implementation class Helloworlsclass
     */
    @WebServlet("/Helloworlsclass")
    public class Helloworlsclass extends HttpServlet {
        private static final long serialVersionUID = 1L;

        /**
         * @see HttpServlet#HttpServlet()
         */
        public Helloworlsclass() {
            super();
            // TODO Auto-generated constructor stub
        }

        /**
         * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
         */
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            // TODO Auto-generated method stub

             response.setContentType("text/html");
                PrintWriter printWriter  = response.getWriter();
                printWriter.println("<h1>Hello World!</h1>");
        }

        /**
         * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
         */
        protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            // TODO Auto-generated method stub
        }

    }

这是网络 XML 文件。

 <?xml version="1.0" encoding="UTF-8"?>
    <web-app>
      <servlet>
          <servlet-name>


              HelloWorld
          </servlet-name>
          <sevlet-class>

              /Helloworlsclass

          </sevlet-class>



          <servlet-mapping>
              HelloWorld

          </servlet-mapping>


          <url-pattern>


              /Helloworlsclass
          </url-pattern>
      </servlet>
    </web-app>

我正在尝试使用此示例运行但浏览器不打印任何内容请告诉我在哪里做错了如何在 servlet 示例中打印 hello world

Answer 1

你写的不是一个完整有效的 HTML 页面，只是一个标题。

当您使用注释时，您根本不需要 web.xml 的东西。