看了网友Roy的评论，研究了一下用filter来解决Struts中文乱码的问题！

Roy 网友指出，用Filter处理Struts中文乱码才是王道，原文请参考这里：

Struts Hack！解决中文参数在Form Bean中的乱码问题！

filter的用法，的确是比较有扩展性的一种方法...可以通过filter结合读取web.xml中的filter参数来完成一系列的动作，做法如下：

首先，实现javax.servlet.Filter接口，编写一个处理request编码的过滤器类...

package tutorial.struts.filter; import javax.servlet.Filter; import javax.servlet.FilterConfig; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; import javax.servlet.FilterChain; import java.io.IOException; public class SetCharacterEncodingFilter implements Filter { protected FilterConfig filterConfig; protected String encodingName; protected boolean enable; public SetCharacterEncodingFilter() { this .encodingName = " UTF-8 " ; this .enable = false ; } public void init(FilterConfig filterConfig) throws ServletException { this .filterConfig = filterConfig; loadConfigParams(); } private void loadConfigParams() { // encoding this .encodingName = this .filterConfig.getInitParameter( " encoding " ); // filter enable flag String strIgnoreFlag = this .filterConfig.getInitParameter( " enable " ); if (strIgnoreFlag.equalsIgnoreCase( " true " )) { this .enable = true ; } else { this .enable = false ; } } public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { if ( this .enable) { request.setCharacterEncoding( this .encodingName); } chain.doFilter(request, response); } public void destroy() { } }

然后，需要在web.xml中注册我们的过滤器类：

< filter > < filter-name > Set Character Encoding filter-name> <filter-class>tutorial.struts.filter.SetCharacterEncodingFilter filter-class> <init-param> <param-name>encoding param-name> <param-value>UTF-8 param-value> init-param> <init-param> <param-name>enable param-name> <param-value>true param-value> init-param> filter> <filter-mapping> <filter-name>Set Character Encoding filter-name> <servlet-name>Action Servlet servlet-name> filter-mapping> <filter-mapping> <filter-name>Set Character Encoding filter-name> <servlet-name>Faces Servlet servlet-name> filter-mapping>

这样，任何通过Struts，或是JSF的Controller Servlet处理的request，都会在过滤器中先行处理，才把控制权交还给Struts或是JSF，而且Filter中有一个Process Chain的概念，是一个很吸引人的东东~~！