1.在tomcat中（webapps文件夹）新建一个mail应用，然后在web应用中新建一个WEB-INF、classes目录。
2.在classes目录中新建一个FirstServlet
3.set classpath=%classpath%;.......servlet.jar 编译servlet
4.在WEB-INF目录中新建一个web.xml文件，配置servlet对外访问路径
5.启动tomcat，访问
2.在classes目录中新建一个FirstServlet
package cn.itcast;
import java.io.*;
import javax.servlet.*;
public class FristServlet extends GenericServlet{
public void service(ServletRequest req,ServletResponse res) throws ServletException,java.io.IOException
{
OutputStream out =res.getOutputStream();
out.write("hello servlet!!!!".getBytes());
}
}
3.set classpath=%classpath%;.......servlet.jar 编译servlet
4.在WEB-INF目录中新建一个web.xml文件，配置servlet对外访问路径
<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
version="3.1">
<servlet>
<servlet-name>FristServlet</servlet-name>
<servlet-class>cn.itcast.FristServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>FristServlet</servlet-name>
<url-pattern>/FristServlet</url-pattern>
</servlet-mapping>
</web-app>
5.启动tomcat，访问
