以Hello World为例, 其基本步骤是：


1．  选择File->New->Project

2．  在对话框中选择Tomcat Project，然后next

3．  输入Project Name，这里可以写HelloWorld，继续next

4．  勾上can update server.xml file选项，finish,好了，一个Poject已经创建好了。

5．  打开new class 向导，在Name中填入HelloWorld,在Superclass中填入javax.servlet.http.HttpServlet，按下finish，好了，一个servlet就创建好了

6．  在HelloWorld.java中重载doGet方法，代码如下：
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;

public class HelloWorld extends HttpServlet {
       public void doGet(HttpServletRequest request,HttpServletResponse response)
      throws IOException, ServletException {
       response.setContentType("text/html");
       PrintWriter writer = response.getWriter();
       writer.println("Hello World!");
      }
}

7.在WEB-INF目录下新建web.xml文件如下：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN" "http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">

<web-app>
<servlet>
<servlet-name>TestServlet</servlet-name>
<servlet-class>HelloWorld</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>TestServlet</servlet-name>
<url-pattern>servlet/HelloWorld</url-pattern>
</servlet-mapping>
</web-app>

8.Ctrl+S保存，右键HelloWorld project,选择Tomcat Project->update context to server.xml
  注意：这里很重要，此步骤eclipse会自动修改了server.xml文件，添加HelloWorld项目。

9.在Eclipse中启动Tomcat

10.在用浏览器访问http://localhost:8080/HelloWorld/servlet/HelloWorld