web.xml文件的配置

xml文件放到WEB-INF文件里面

<?xml version="1.0" encoding="UTF-8"?>

<web-app>
<servlet>
<servlet-name>HelloWord</servlet-name>
<servlet-class>servlet.HelloWord</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>HelloWord</servlet-name>
<url-pattern>/hello</url-pattern>
</servlet-mapping>
</web-app>