java，

java，

package com.newtest.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;


public class myFilter implements Filter{


public void destroy() {// TODO Auto-generated method stub}public void doFilter(ServletRequest arg0, ServletResponse arg1,
FilterChain arg2) throws IOException, ServletException {HttpServletRequest request = (HttpServletRequest) arg0;HttpServletResponse reponse = (HttpServletResponse) 


arg1;if(request.getSession().getAttribute("student") == null && request.getRequestURI().indexOf("Test.jsp") ==-1){reponse.sendRedirect("Test.jsp");
}arg2.doFilter(arg0, arg1);
}public void init(FilterConfig arg0) throws ServletException {
// TODO Auto-generated method stub

}


}