【JSP开发】建立第一个Servlet项目

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

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