使用Eclipse Java EE运行Servlet

Question

I'm trying to run a servlet using Apache Tomcat v7.0 (i also tried 8) using Dynamic web module version 3.0.

I've also tried with the xml file (even though it should work without it because its 3.0) and it doesn't work aswell... What the hell am I doing wrong?

The error is The requested resource is not available.

EDIT: Ok, so I made a XML file again so you can maybe tell me what i'm doing wrong in it...

<?xml version="1.0" encoding="UTF-8"?>
<web-app>
 <servlet>
    <servlet-name>HelloServlet</servlet-name>
    <servlet-class>code.HelloServlet</servlet-class>
  </servlet>

  <servlet-mapping>
    <servlet-name>HelloServlet</servlet-name>
    <url-pattern>/hello</url-pattern>
  </servlet-mapping>
</web-app>

code is the name of the package inside src.

I'm using the url: http://localhost:8080/hello , still not working

Answer 1

The package is wrong, you defined in the web.xml:

  <servlet-class>code.HelloServlet</servlet-class>

and in the class

package net.codejava;

So this should fix the problem:

<servlet-class>net.codejava.HelloServlet</servlet-class

Answer 2

It's quite unclear from the question, either you want to create Servlet using @WebServlet or through web.xml .

To create Servlet using @WebServlet you do not need web.xml configuration at all.

Just create a class annotated with @WebServlet and call the url as below:

import java.io.IOException;

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

@WebServlet("/HelloServlet")
public class MyServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws IOException {
        response.getWriter().println("Hello");
    }
}

Then call url: http://host:port/context-root[/url-pattern] , for me it's http://localhost:8989/TestApplication/HelloServlet

Or if you want to create through web.xml then load the servlet on startup as below:

<servlet>
        <display-name>Hello Servlet</display-name>
        <servlet-name>HelloServlet</servlet-name>
        <servlet-class>com.package.name.HelloServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>HelloServlet</servlet-name>
        <url-pattern>/HelloServlet/*</url-pattern>
    </servlet-mapping>

Again you can call like : http://host:port/context-root[/url-pattern] , for me it's http://localhost:8989/TestApplication/HelloServlet