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jsp實現登錄驗證的過濾器
瀏覽：404日期：2022-06-07 14:55:44
本文實例為大家分享了jsp實現登錄驗證的過濾器，供大家參考，具體內容如下
1.新建一個Dynamic Web Project項目，里面新建1個filter文件、1個servlet文件和2個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運行之后得到的結果如下所示：
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持。
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JSP
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