Getting HTTP Status 404 error when trying to run s

2020-02-12 14:29发布

This question already has answers here:

Servlet returns “HTTP Status 404 The requested resource (/servlet) is not available” (10 answers)

I have a problem with my simple servlet that I am trying to run, Hello.java. I made it in eclipse, then placed the file it in the webapps/ServletTest/WEB-INF/classes folder and compiled it, creating the file Hello.class in the same folder. I then modified my web.xml file to map the servlet and tried to run it through the following address

http://localhost:8080/ServletTest/Hello

However, this did not work, giving the following error

HTTP Status 404 -

type Status report

message

description The requested resource is not available. Apache Tomcat/7.0.42

The mapping in the web.xml file looks like this:

<servlet>
<servlet-name>Hello</servlet-name>
<servlet-class>Main.Hello</servlet-class>
</servlet>  

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

The code of the servlet:

package Main;
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;
@WebServlet("/Hello")
public class Hello extends HttpServlet {
private static final long serialVersionUID = 1L;
public Hello() {
super();
 }

protected void doGet(HttpServletRequest request, HttpServletResponse                   

response)  throws ServletException, IOException {
    PrintWriter out = response.getWriter();
    response.setContentType("text/html");
    String path = request.getContextPath();
    String ip = request.getRemoteAddr();
    out.print("<html>" +
    "<title>Hello</title>" +
            "Hello World"+ "<br>" +
    "Your ip is: " + ip + "<br>" +
    "Your path is: " + path
    + "</html>");       
}
protected void doPost(HttpServletRequest request, HttpServletResponse response)   

throws     ServletException, IOException {

}

}