这篇文章主要介绍java web如何实现自动登录功能,文中介绍的非常详细,具有一定的参考价值,感兴趣的小伙伴们一定要看完!
具体内容如下
主要思路就是:当用户访问网站的首页时,浏览器端会先检擦浏览器中存在的cookie中是否又登录的用户的用户名,如果有,则直接跳转至用户登录好的界面,如果没有,则重定向至登录界面,在服务器端创建该用户登录的cookie,响应时,将创建的cookie返回至浏览器端保存。
一、用户访问首页时检查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、确定用户登录的cookie不存在,在手动登录的过程中创建用户登录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);//有效期为一个星期 response.addCookie(cookie); request.setAttribute("name",name); request.getRequestDispatcher("user.view").forward(request, response); } }else{ response.sendRedirect("login.jsp"); } } }
三、登录成功时的视图层
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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