有个HttpServletRequest问题?
这是异常
15:42:12,297 ERROR [[jsp]] Servlet.service() for servlet jsp threw exception
java.lang.ClassCastException: org.apache.catalina.connector.RequestFacade cannot be cast to javax.servlet.http.HttpServletRequest
at com.sunnysoft.sehrs.common.filter.EncodingFilter.doFilter(EncodingFilter.java:26)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:235)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92)
at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126)
at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:829)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:598)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)


这是filter

package com.sunnysoft.sehrs.common.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.sunnysoft.sehrs.common.Constants;

public class EncodingFilter implements Filter {

public void destroy() {
// TODO Auto-generated method stub

}

public void doFilter(ServletRequest arg0, ServletResponse arg1,
FilterChain arg2) throws IOException, ServletException {
// System.out.println("start encoding...");
HttpServletRequest request = (HttpServletRequest) arg0;//这里是异常所说的第26行
HttpServletResponse response = (HttpServletResponse) arg1;
String currentURL = request.getRequestURI();



String targetURL = currentURL.substring(currentURL.indexOf("/", 1),
currentURL.length());

if (!"/".equals(targetURL) && !"/login.do".equals(targetURL)&& !"/user.do".equals(targetURL)
&& !"/SEHRS/common/jsp/sehrs_login.jsp".equals(targetURL)) {

if (request.getSession().getAttribute(Constants.LOGIN_USER) == null) {
response
.sendRedirect("/SEHRS/SEHRS/common/jsp/sehrs_login.jsp");
return;
}

}



((HttpServletRequest) arg0).setCharacterEncoding("GBK");
((HttpServletResponse) arg1).setCharacterEncoding("GBK");
// System.out.println("end encoding...");