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      ±àд¹ýÂËÆ÷ÀࣺʵÏÖ½Ó¿Újavax.servlet.Filter
 public class CharacterEncodingFilter implements Filter {
private String charset;
public void destroy() {
// TODO Auto-generated method stub

}
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain filterChain) throws IOException, ServletException {
// TODO Auto-generated method stub
request.setCharacterEncoding(charset);
filterChain.doFilter(request, response);
}
public void init(FilterConfig config) throws ServletException {
// TODO Auto-generated method stub
charset = config.getInitParameter("charset");
}
}

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String username = new String(request.getParamter("userName").getBytes("ISO8859-1"),"GBK")
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<Connector port="8080" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443"/>
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public class CheckLoginFilter implements Filter {
public void destroy() {
// TODO Auto-generated method stub

}
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
// TODO Auto-generated method stub
HttpServletRequest hsRequest = (HttpServletRequest)request;
HttpServletResponse hsResponse = (HttpServletResponse)response;
HttpSession session = hsRequest.getSession();
//ûµÇ¼
if(session.getAttribute("userID") == null)
{
String uri = hsRequest.getRequestURI();
// ÇëÇóµ


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