以下是我的过滤器代码:
package untitled1;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;

public class Filter2 extends HttpServlet implements Filter {
    private FilterConfig filterConfig;
    //Handle the passed-in FilterConfig
    public void init(FilterConfig filterConfig) throws ServletException {
        this.filterConfig = filterConfig;
    }

    //Process the request/response pair
    public void doFilter(ServletRequest request, ServletResponse response,
                         FilterChain filterChain) {
        try {
            //是一个.do的请求
            String url = ((HttpServletRequest) request).getRequestURI();
            System.out.print("url=" + url);

            String name = "/index.wml"; // 这是生成的wml文件名
            String pName = "e:\\index.wml"; // 生成html的完整路径
            String realPath = "";
            try {
                java.io.File file = new java.io.File(request.getRealPath(url));
                realPath = "F:/Temp/untitled1/WebModule1/"; // file.getParent();
            } catch (Exception e) {

            }
            final ByteArrayOutputStream os = new ByteArrayOutputStream();
            final ServletOutputStream stream = new ServletOutputStream() {
                public void write(byte[] data, int offset, int length) {
                    os.write(data, offset, length);
                }

                public void write(int b) throws IOException {
                    os.write(b);
                }
            };
            final PrintWriter pw = new PrintWriter(new OutputStreamWriter(os));

            HttpServletResponse rep = new HttpServletResponseWrapper((
                    HttpServletResponse) response) {
                public ServletOutputStream getOutputStream() {
                    return stream;
                }

                public PrintWriter getWriter() {
                    return pw;
                }
            };
            //将请求拦截后，把请求的响应保存到rep对象中
            filterChain.doFilter(request, rep);
            pw.flush();
            FileOutputStream fos = new FileOutputStream(realPath + name); // 把jsp输出的内容写到指定路径的htm文件中
            os.writeTo(fos);
            fos.close();
            //原请求响应保到到文件中
            //此处需要重定向到被保存下来的文件，但不知如何操作（注意：此过滤器设定为对Action对象进行过滤)???????????????????????

        } catch (Exception sx) {
            filterConfig.getServletContext().log(sx.getMessage());
        }
    }

    //Clean up resources
    public void destroy() {
    }
}
以下是Action:
public class Test extends Action {
    public ActionForward execute(ActionMapping mapping, ActionForm form,
                                 HttpServletRequest request,
                                 HttpServletResponse response) {
        return mapping.findForward("index");
    }
}