import java.io.IOException;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet Filter implementation class Filter
*/
@WebFilter("/*")
public class Filter implements javax.servlet.Filter {
/**
* Default constructor.
*/
public Filter() {
// TODO Auto-generated constructor stub
}
/**
* @see Filter#destroy()
*/
public void destroy() {
// TODO Auto-generated method stub
}
/**
* @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
*/
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
// TODO Auto-generated method stub
// 将请求转换成HttpServletRequest请求
HttpServletRequest httpRequest=(HttpServletRequest)request;
// 将响应转换成HttpServletResponse响应
HttpServletResponse httpResponse = (HttpServletResponse)response;
//截取用户的请求地址
String from =httpRequest.getServletPath();
System.out.println(from);
if(from.equals("/login.html")) {
//获取本站在客户端上保留的所有的cookie
Cookie[] cookies=httpRequest.getCookies();
if(cookies!=null) {
//遍历cookie数组
httpResponse.sendRedirect("cookieSave");
}
// 将保存在cookie中的用户名和密码保存在request
/*httpRequest.setAttribute("username",username);
httpRequest.setAttribute("password", password);*/
// 放行请求
chain.doFilter(request, response);
}
else {
// 用户请求的地址是servlet,直接放行请求
chain.doFilter(request, response);
}
}
/**
* @see Filter#init(FilterConfig)
*/
public void init(FilterConfig fConfig) throws ServletException {
// TODO Auto-generated method stub
//System.err.println("filter init");
}
}