解決辦法:
第一步:將%TOMCAT_HOME%\webapps\servlets-examples\WEB-INF\classes\filters\SetCharacterEncodingFilter.class拷貝到自己web應用的\WEB-INF\classes\filters下。
第二步:
在web.xml中添加
<filter>
<filter-name>Set Character Encoding</filter-name>
<filter-class>filters.SetCharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>GBK</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>Set Character Encoding</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>