关于web.xml中一些配置的解释

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1 在 WEB.XML配置实现浏览器根据文件类型自动打开,我们用浏览器打开文件的时候会发现如果是doc文件，会用记事本打开，出现乱码，但是如果在web.xml里面配置了类型，浏览器就会根据配置的类型自动调用相应的程序打开

在 WEB.XML 配置常用文件类型

	<mime-mapping>
		<extension>doc</extension>
		<mime-type>application/vnd.ms-word</mime-type>
	</mime-mapping>
	<mime-mapping>
		<extension>gif</extension>
		<mime-type>image/gif</mime-type>
	</mime-mapping>
	<mime-mapping>
		<extension>htm</extension>
		<mime-type>text/html</mime-type>
	</mime-mapping>
	<mime-mapping>
		<extension>html</extension>
		<mime-type>text/html</mime-type>
	</mime-mapping>
	<mime-mapping>
		<extension>jnlp</extension>
		<mime-type>application/x-java-jnlp-file</mime-type>
	</mime-mapping>
	<mime-mapping>
		<extension>jpeg</extension>
		<mime-type>image/jpeg</mime-type>
	</mime-mapping>
	<mime-mapping>
		<extension>jpg</extension>
		<mime-type>image/jpeg</mime-type>
	</mime-mapping>
	<mime-mapping>
		<extension>js</extension>
		<mime-type>application/x-javascript</mime-type>
	</mime-mapping>
	<mime-mapping>
		<extension>pdf</extension>
		<mime-type>application/pdf</mime-type>
	</mime-mapping>
	<mime-mapping>
		<extension>png</extension>
		<mime-type>image/png</mime-type>
	</mime-mapping>
	<mime-mapping>
		<extension>rar</extension>
		<mime-type>application/x-rar-compressed</mime-type>
	</mime-mapping>
	<mime-mapping>
		<extension>txt</extension>
		<mime-type>text/plain</mime-type>
	</mime-mapping>
	<mime-mapping>
		<extension>xls</extension>
		<mime-type>application/vnd.ms-excel</mime-type>
	</mime-mapping>
	<mime-mapping>
		<extension>xml</extension>
		<mime-type>text/xml</mime-type>
	</mime-mapping>
	<mime-mapping>
		<extension>xul</extension>
		<mime-type>application/vnd.mozilla.xul-xml</mime-type>
	</mime-mapping>
	<mime-mapping>
		<extension>zhtml</extension>
		<mime-type>text/html</mime-type>
	</mime-mapping>
	<mime-mapping>
		<extension>zip</extension>
		<mime-type>application/x-zip</mime-type>
	</mime-mapping>
	<mime-mapping>
		<extension>zul</extension>
		<mime-type>text/html</mime-type>
	</mime-mapping>

2.关于login-config 配置的解读

Tomcat中安全机制
BASIC认证	<login-config> <auth-method>BASIC</auth-method> </login-config>
DIGEST认证	采用MD5加密 <login-config> <auth-method>DIGEST</auth-method> </login-config>
FORM认证	基础自定义表单的认证，你可以指定登录时的验证表单 <login-config> <auth-method>FORM</auth-method> <form-login-config> <!—创建登录表单 --> <form-login-pages>/login.htm</form-login-pages> <!—创建错误表单 --> <form-error-pages>/error.html</form-error-pages> </form-login-config> </login-config>
CLIENT-CERT认证	一种基于客户端证书的认证方式，比较安全。但缺陷是在没有安全证书的客户端无法使用。 <login-config> <auth-method>CLIENT-CERT</auth-method> </login-config>