登录过滤

标签：java   pack   dispatch   inf   username   ring   setattr   print   sys   

package com.lovo.j173.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.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebFilter("/html/*")
public class LoginFilter implements Filter {

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
HttpServletRequest req=(HttpServletRequest)request;
HttpServletResponse resp=(HttpServletResponse)response;
if (req.getSession().getAttribute("username")!=null) {
chain.doFilter(request, response);

}else {
resp.sendRedirect("../login.html");
}

package com.lovo.j173.filter;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

@WebServlet("/LoginServlet")
public class LoginServlet extends HttpServlet {

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String username=request.getParameter("username");
String pwd=request.getParameter("password");
HttpSession session=request.getSession();
session.setAttribute("username", username);
response.sendRedirect("html/NewFile.html");
System.out.print(111);
// request.getRequestDispatcher("html/NewFile.html").forward(request, response);

}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

}

}

}

}

登录过滤

标签：java   pack   dispatch   inf   username   ring   setattr   print   sys   

原文地址：https://www.cnblogs.com/zxcvbnm-sj/p/11839377.html