index14_login.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>login
index14_download.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>DownloadTest 欢迎来到资源下载页面
Servlet13_login.java
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; import java.io.IOException; @WebServlet("/servlet13_login") public class Servlet13_login extends HttpServlet { @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String adminname = req.getParameter("adminname"); String password = req.getParameter("password"); if (adminname.equals("admin") && password.equals("123456")) { HttpSession session = req.getSession(); session.setAttribute("adminname", adminname); resp.sendRedirect("index14_download.jsp"); } } }
Servlet13_DownloadFilter.java
@WebFilter("/index14_download.jsp") public class Servlet13_DownloadFilter implements Filter { @Override public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { //强转子类,多态,向下转型 HttpServletRequest request = (HttpServletRequest) servletRequest; HttpServletResponse response = (HttpServletResponse) servletResponse; HttpSession httpSession = request.getSession(); String name = (String) httpSession.getAttribute("adminname"); if (name == null) { //name==null不是登录状态,直接来到登录页面 response.sendRedirect("/index14_login.jsp"); } else { //如果name不为空了,证明用户已经登录上了,过滤链继续往下走。 filterChain.doFilter(servletRequest, servletResponse); } } }
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