Created: 6.15

Servlet configuration

1. basic configuration

Wherein the url-pattern configuration:

1) exact match exactly the same access to resources and configuration of access to resources

2) directory matches the format: / virtual directory ../* * represents any that access any resources in this virtual directory can access to this stuff

The browser address

Have access to

3) extension matches the format: * extension.

The browser address:

! Note: The second and third do not mix / aaa / bbb / * abcd (wrong).

2. Servlet instance of the server startup configuration

Servlet when to create: default create first visit servlet

Why is the default? You can modify created when the server is started:

When coupled with a configuration when you configure the web.xml servlet <load-on-startup> servlet object is created when the server starts

(Typically accounting for the number of middle priority)

3. Default Servlet

url-pattern may be configured a /, on behalf of the servlet is the default servlet

What is the default (default) in the servlet?

When you access a resource addresses of all the servlet does not match (not the resource), the default servlet handles

* In fact, web applications to respond to all of the resources are responsible for servlet, including static resources

(Servlet is the default configuration, less than the static resource access.)

Example: Create a html, the html file access, display is service () print content

Want to access static resources, prior written three kinds url-patteern configuration on the line.

the reason:

* First mention of the global Tomcat configuration file:

Here web.xml Tomcat is global and applies to all items in the Tomcat web, but when the number of items and web.xml internal configuration conflicts, it is effective to partially project within web.xml

* Let me say is how to find internal resources.

* Internal resources to find the process:

不是直接找文件。内部将名称1.html整体作为名称，去web项目中的配置文件web.xml中找资源<url-pattern>1.html</url-pattern>，（动态资源找不到）没有找到就去找Tomcat全局配置文件web.xml中的<url-pattern>/</url-pattern>，它去找DefaultServlet。