add a filter to set the charset encoding

	<filter>
		<filter-name>CharsetEncodingFilter</filter-name>
		<filter-class>org.young.filter.CharsetEncodingFilter</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>CharsetEncodingFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>