这是我filter的代码：
//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;
//public class LoginFilter implements Filter{
// public void init(FilterConfig config) throws ServletException{};
// public void doFilter(ServletRequest req,ServletResponse res,FilterChain chain) throws IOException,ServletException{
// HttpServletRequest request = (HttpServletRequest ) req;
// HttpServletResponse response = (HttpServletResponse) res;
//// String username="";
//// String password="";
//// username=request.getParameter("username");
//// password=request.getParameter("password");
////
//// if(username.trim().length()==0 || password.trim().length()==0)
//// request.getRequestDispatcher("/login.jsp").forward(request,response);
//// else
// chain.doFilter(request, response);
//
//
// }
// public void destroy() {
// // TODO Auto-generated method stub
//
// }
//
//}
import java.io.IOException;
import com.zju.edu.bean.*;
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 javax.servlet.http.HttpSession;
public class LoginFilter implements Filter {
private FilterConfig config;
public void destroy() {
System.out.println(config.getFilterName()+"被销毁");
}
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain filterChain) throws IOException, ServletException {
HttpServletRequest req = (HttpServletRequest) request;
HttpServletResponse res = (HttpServletResponse) response;
HttpSession session = req.getSession();
System.out.println("请求被loginFIlter过滤！");
if(session.getAttribute("manager")== null){
System.out.println("管理员没有登录，请重新登录！");
request.getRequestDispatcher("login.jsp").forward(request, response);
// res.sendRedirect("RMCDP/login.jsp");
}else{
filterChain.doFilter(request, response);
}
System.out.println("响应被loginFilter过滤！");
}
public void init(FilterConfig filterConfig) throws ServletException {
}
}
下面是配置代码：
<filter>
<filter-name>LoginFilter</filter-name>
<filter-class>com.zju.edu.filter.LoginFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>LoginFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
发现跳转到首页之后，所有的图片都不见了，包括背景图片和servlet生成的验证码图片都不见了，这是怎么回事，如何解决啊？
