這篇文章主要介紹java web如何實(shí)現(xiàn)自動(dòng)登錄功能,文中介紹的非常詳細(xì),具有一定的參考價(jià)值,感興趣的小伙伴們一定要看完!
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主要思路就是:當(dāng)用戶(hù)訪(fǎng)問(wèn)網(wǎng)站的首頁(yè)時(shí),瀏覽器端會(huì)先檢擦瀏覽器中存在的cookie中是否又登錄的用戶(hù)的用戶(hù)名,如果有,則直接跳轉(zhuǎn)至用戶(hù)登錄好的界面,如果沒(méi)有,則重定向至登錄界面,在服務(wù)器端創(chuàng)建該用戶(hù)登錄的cookie,響應(yīng)時(shí),將創(chuàng)建的cookie返回至瀏覽器端保存。
一、用戶(hù)訪(fǎng)問(wèn)首頁(yè)時(shí)檢查cookie是否存在。
package ahpudong.com; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.Cookie; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; @WebServlet("/index.do") public class index extends HttpServlet { public index() { super(); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { Cookie[] cookies=request.getCookies(); if(cookies!=null){ for(Cookie cookie:cookies){ String name=cookie.getName(); String value=cookie.getValue(); if("name".equals(name) && "chendong".equals(value)){ request.setAttribute(name, value); request.getRequestDispatcher("user.view").forward(request, response); return; } } } response.sendRedirect("login.jsp"); } }
二、確定用戶(hù)登錄的cookie不存在,在手動(dòng)登錄的過(guò)程中創(chuàng)建用戶(hù)登錄cookie。
package ahpudong.com; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.Cookie; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; @WebServlet("/login.do") public class login extends HttpServlet { public login() { super(); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); request.setCharacterEncoding("utf-8"); response.setCharacterEncoding("utf-8"); PrintWriter out = response.getWriter(); String name=request.getParameter("name"); String pwd=request.getParameter("pwd"); String login=request.getParameter("auto"); if("chendong".equals(name) && "123456".equals(pwd)){ if("on".equals(login)){ Cookie cookie=new Cookie("name","chendong"); cookie.setMaxAge(7*24*60*60);//有效期為一個(gè)星期 response.addCookie(cookie); request.setAttribute("name",name); request.getRequestDispatcher("user.view").forward(request, response); } }else{ response.sendRedirect("login.jsp"); } } }
三、登錄成功時(shí)的視圖層
package ahpudong.com; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; @WebServlet("/user.view") public class User extends HttpServlet { public User() { super(); } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request,response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request,response); } public void processRequest(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException{ response.setCharacterEncoding("utf-8"); PrintWriter out=response.getWriter(); String name=(String) request.getAttribute("name"); out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">"); out.println("<HTML>"); out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>"); out.println(" <BODY>"); out.println("<h2>"+"welcome "+name+" login"+"</h2>"); out.println(" </BODY>"); out.println("</HTML>"); out.flush(); out.close(); } }
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