public class MyCharacterEncodingServlet extends DefaultServlet {
  /**
  * Return the relative path associated with this servlet.
  *
  * @param request The servlet request we are processing
  */
  protected String getRelativePath(HttpServletRequest request) {
  // IMPORTANT: DefaultServlet can be mapped to ‘/’ or ‘/path/*’ but always
  // serves resources from the web app root with context rooted paths.
  // i.e. it can not be used to mount the web app root under a sub-path
  // This method must construct a complete context rooted path, although
  // subclasses can change this behaviour.
  // Are we being processed by a RequestDispatcher.include()?
    if (request.getAttribute(Globals.INCLUDE_REQUEST_URI_ATTR) != null) {
      String result = (String) request.getAttribute(
      Globals.INCLUDE_PATH_INFO_ATTR);
    if (result == null) {
      result = (String) request.getAttribute(
      Globals.INCLUDE_SERVLET_PATH_ATTR);
    }
    else {
      result = (String) request.getAttribute(
      Globals.INCLUDE_SERVLET_PATH_ATTR) + result;
    }
    if ((result == null) || (result.equals(""))) {
      result = "/";
    }
    return (result);
  }
  // No, extract the desired path directly from the request
  String result = request.getPathInfo();
  if (result == null) {
  result = request.getServletPath();
  } else {
  result = request.getServletPath() + result;
  }
  if ((result == null) || (result.equals(""))) {
  result = "/";
  }
  try{
  result = new String(result.getBytes("ISO-8859-1″), "UTF-8″);
  }
  catch (Exception e) {
  // TODO: handle exception
  }
  return (result);
  }
  @Override
  protected void doDelete(HttpServletRequest req, HttpServletResponse resp)
  throws ServletException, IOException {
  // TODO Auto-generated method stub
  super.doGet(req, resp);
  }
  @Override
  protected void doPost(HttpServletRequest request,
  HttpServletResponse response) throws IOException, ServletException {
  // TODO Auto-generated method stub
  super.doGet(request, response);
  }
  @Override
  protected void doPut(HttpServletRequest req, HttpServletResponse resp)
  throws ServletException, IOException {
  // TODO Auto-generated method stub
  super.doGet(req, resp);
  }
}

  <servlet>
    <servlet-name>chnURIServlet</servlet-name>
    <servlet-class>com.gzy.zjer.core.web.MyCharacterEncodingServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>chnURIServlet</servlet-name>
    <url-pattern>/UserFiles/*</url-pattern>
  </servlet-mapping>