1.首先建filter的EncodingFilter.java这个类（固定的不用改）
2.要在web.xml文件里加在filter要价到servlet-mapping后面
例如：
</servlet-mapping>
<filter>
<filter-name>Filter</filter-name>
<filter-class>qw.lhf.filter.EncodingFilter</filter-class>
<init-param>
<param-name>Encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>Filter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
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