jsp實(shí)現(xiàn)登錄驗(yàn)證的過濾器
本文實(shí)例為大家分享了jsp實(shí)現(xiàn)登錄驗(yàn)證的過濾器,供大家參考,具體內(nèi)容如下
1.新建一個(gè)Dynamic Web Project項(xiàng)目,里面新建1個(gè)filter文件、1個(gè)servlet文件和2個(gè)jsp文件,整體的框架如圖所示:
2.LoginFilter.java里面的代碼如下所示:
package filter; import java.io.IOException; import java.io.PrintWriter; 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; import javax.servlet.http.HttpSession; @WebFilter(filterName = "loginFilter", urlPatterns = { "/*" }) public class LoginFilter implements Filter { public void destroy() { } public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { HttpServletRequest req = (HttpServletRequest) request; HttpServletResponse resp = (HttpServletResponse) response; HttpSession session = req.getSession(true); resp.setContentType("text/html;"); resp.setCharacterEncoding("utf-8"); PrintWriter out = resp.getWriter(); String request_uri = req.getRequestURI(); String ctxPath = req.getContextPath(); String uri = request_uri.substring(ctxPath.length()); if (uri.contains("login.jsp") || uri.contains("loginServlet")) { chain.doFilter(request, response); } else { if (session.getAttribute("user") != null) { chain.doFilter(request, response); } else { out.println("您沒有登錄,請(qǐng)先登錄!3秒后回到登錄頁面。"); resp.setHeader("refresh", "3;url=" + ctxPath + "/login.jsp"); return; } } } public void init(FilterConfig fConfig) throws ServletException { } }
3.LoginServlet.java里面的代碼如下所示:
package servlet; 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(name = "loginServlet", urlPatterns = { "/loginServlet" }) public class LoginServlet extends HttpServlet { private static final long serialVersionUID = 1L; protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String username = request.getParameter("name"); String password = request.getParameter("pwd"); if ("filter".equals(username) && "filter".equals(password)) { HttpSession session = request.getSession(true); session.setAttribute("user", username); response.sendRedirect("loginSuccess.jsp"); } else { response.sendRedirect("login.jsp"); } } }
4.login.jsp里面的代碼如下所示:
<%@page import="java.util.Date"%> <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>example</title> </head> <body bgcolor="lightPink"> <form action="loginServlet" method="post"> <table> <tr> <td>用戶名:</td> <td><input type="text" name="name" /></td> </tr> <tr> <td>密碼:</td> <td><input type="password" name="pwd" /> </tr> <tr> <td><input type="submit" value="提交" /></td> <td><input type="reset" value="重置" /></td> </tr> </table> </form> </body> </html>
5.loginSuccess.jsp里面的代碼如下所示:
<%@page import="java.util.Date"%> <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>example</title> </head> <body> <% String username = (String) session.getAttribute("user"); %> 恭喜<%=username%>登錄成功! </body> </html>
6.在瀏覽器里面輸入http://localhost:8080/Servlet/login.jsp運(yùn)行之后得到的結(jié)果如下所示:
以上就是本文的全部內(nèi)容,希望對(duì)大家的學(xué)習(xí)有所幫助,也希望大家多多支持腳本之家。
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