jsp使用cookie保存用户名和密码,javaee中,servletAP为使用cookie

1.编写登录界面

<!DOCTYPE html><html> <head> <title>Login.html</title> <meta name="keywords" content="keyword1,keyword2,keyword3"> <meta name="description" content="this is my page"> <meta name="content-type" content="text/html; charset=UTF-8"> <title>登录界面</title> </head> <body> <h3>登录系统</h3> <form action="/myJavaEELearnDemo/Login" method="post"> <label for="用户名：">用户名：</label><input type="text" name="userName" width="100px"> </br> </br> <label for="用户名：">密　码：</label><input type="password" name="passWord" width="100px"> </br> </br> <input type="submit" value="登录" /> <input type="reset" value="重新填写"/> </form> </body></html>

2.网页提交表单响应servlet并在web.xml中配置servlet

<servlet> <servlet-name>Login</servlet-name> <servlet-class>com.lyh.serlet.Login</servlet-class> </servlet> <servlet-mapping> <servlet-name>Login</servlet-name> <url-pattern>/Login</url-pattern> </servlet-mapping>

3.登录servlet 关键源码：

public void doPost(brdse, HttpServletResponse response)throws ServletException, IOException {sun.misc.BASE64Encoder base64Encoder= new sun.misc.BASE64Encoder();ByteArrayOutputStream classBytes = new ByteArrayOutputStream();ObjectOutputStream oos = new ObjectOutputStream(classBytes);oos.writeObject(new MyCookie());oos.close();String classStr=base64Encoder.encode(classBytes.toByteArray());Cookie cookie= new Cookie("mycookie", classStr);cookie.setMaxAge(60*60*24);response.addCookie(cookie);RequestDispatcher readCookieDispatcher=getServletContext().getRequestDispatcher("/ReadCookie"); readCookieDispatcher.include(request, response);}ReadCookie关键源码

public void doPost(brdse, HttpServletResponse response)throws ServletException, IOException {response.setContentType("text/html");PrintWriter out = response.getWriter();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>"); try {sun.misc.BASE64Decoder base64Decoder = new sun.misc.BASE64Decoder();Cookie cookie2=getCookieValue(request.getCookies(), "mycookie");if (cookie2 == null) {return ;}String classStr=cookie2.getValue();out.println("<br/>"+classStr+"<br/>");byte[] classBytes = base64Decoder.decodeBuffer(classStr);ObjectInputStream ois=new ObjectInputStream(new ByteArrayInputStream(classBytes));MyCookie myCookie= (MyCookie)ois.readObject();out.println(myCookie.getMsg());} catch (Exception e) {// TODO: handle exception} out.println(" </BODY>");out.println("</HTML>");out.flush();out.close();} protected Cookie getCookieValue(Cookie[] cookies,String name) { if (cookies!=null) {for (Cookie c:cookies) { if (c.getName().equals(name)) {return c;}} } return null; }