之前做了个jsp注册用户的，在struts.xml中配置了编码，在web.xml也配置了spring的过滤编码，但是都没有用，后面就写了过滤器，配置在web.xml中就可以了。

EncoderFilter.java

public class EncodeFilter extends StrutsPrepareAndExecuteFilter   {
    private FilterConfig config = null;
    private String encoding = null;
    
    @Override
    public void init(FilterConfig config) throws ServletException {
       this.config = config;
    }
    
    @Override
    public void doFilter(ServletRequest request, ServletResponse response,
           FilterChain chain) throws IOException, ServletException {
        if (encoding == null) {
            encoding = config.getInitParameter("encoding");
           }
           request.setCharacterEncoding(encoding);
           response.setCharacterEncoding(encoding);
           chain.doFilter(request, response);
    }

    @Override
    public void destroy() {
        config = null;
        encoding = null;
    }
}

<filter>
           <filter-name>encodeFilter</filter-name>
           <filter-class>com.smc.util.EncodeFilter</filter-class>
           <init-param>
               <param-name>encoding</param-name>
               <param-value>utf-8</param-value>
           </init-param>
</filter>
<filter-mapping>
           <filter-name>encodeFilter</filter-name>
           <url-pattern>/*</url-pattern>
</filter-mapping>