JavaWEB 核心编程视频教程 02

二、JavaWeb开发的目录结构

1、在浏览器中输入http://localhost:8080/进入tomcat的主页，然后单击host-manager菜单，弹出用户名和密码对话框，点击取消会出现一段话

You are not authorized to view this page. If you have not changed any configuration files, please examine the file conf/tomcat-users.xml in your installation. That
file must contain the credentials to let you use this webapp.
For example, to add the admin-gui role to a user named tomcat with a password of s3cret,
add the following to the config file listed above.

<role rolename="admin-gui"/>
<user username="tomcat" password="s3cret" roles="admin-gui"/>

Note that for Tomcat 7 onwards, the roles required to use the host manager application were changed from the single admin role to the following two roles. You will
need to assign the role(s) required for the functionality you wish to access.
admin-gui - allows access to the HTML GUI
admin-script - allows access to the text interface
The HTML interface is protected against CSRF but the text interface is not. To maintain the CSRF protection:
Users with the admin-gui role should not be granted the admin-script role.
If the text interface is accessed through a browser (e.g. for testing since this interface is intended for tools not humans) then the browser must be closed afterwards to terminate the session.
根据上述提示，在tomcat的conf目录下找到tomcat-users.xml文件，添加上述信息

2、Servlet规范定义了web应用程序的目录层次

首先是web程序的根目录，根目录下包含WEB-INF目录和JSP或者html文件。WEB-INF文件夹下包含classes和lib文件夹。