标签:text 思路 charset lang 元素 通过 als pos send
本案例中包含三个jsp文件:Login.jsp,check.jsp,A.jsp.
Login.jsp中设置登录界面,其中html代码如下:
<form action="Check.jsp" method="post"> UserId:<input type="text" name= "name" value ="<%=(name == null)?" ":name %>"><br/> Password:<input type="password" name="pwd"><br/> <input type = "submit" value = "Log in "></input> </form>
//这里有些变量会在后面给出
思路:
用户输入账号密码后,跳转到check.jsp页面,通过
String uname = request.getParameter("name");
String pwd = request.getParameter("pwd");
得到账号密码,然后通过如下代码把Name和pwd都放到cookie里面,通过response接收
Cookie cookie = new Cookie("uname",uname); Cookie cookie2 = new Cookie("pwd",pwd); response.addCookie(cookie); response.addCookie(cookie2);
最后重定向跳转到新的界面A.jsp.
response.sendRedirect("A.jsp");//A.jsp中内容随意设置即可
在这之后,cookie被带到了客户端,这个时候cookie已经在客户端保存好了,客户端可以利用request.getCookie()得到cookie,并进一步获取其中的元素。
回到Login.jsp,其中需要的java代码是
<%! String name = null; %> <% Cookie[] cookies = request.getCookies(); for(Cookie cookie:cookies)//for each 循环遍历cookies中的所有cookie { if(cookie.getName().equals("name"))//如果cookie中的Name是uname的话,取他的value值赋给这里的name { name = cookie.getValue(); } } %>
完整的Login.jsp代码:
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> <!DOCTYPE html> <html> <head> <meta charset="ISO-8859-1"> <title>2re</title> </head> <body> <%! String name = null; %> <% Cookie[] cookies = request.getCookies(); for(Cookie cookie:cookies) { if(cookie.getName().equals("name")) { name = cookie.getValue(); } } %> <form action="Check.jsp" method="post"> UserId:<input type="text" name= "name" value ="<%=(name == null)?" ":name %>"><br/> Password:<input type="password" name="pwd"><br/> <input type = "submit" value = "Log in "></input> </form> </body> </html>
check.jsp代码:
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> <!DOCTYPE html> <html> <head> <meta charset="ISO-8859-1"> <title>Insert title here</title> </head> <body> <% String name = request.getParameter("name"); String pwd = request.getParameter("pwd"); Cookie cookie = new Cookie("name",name); Cookie cookie2 = new Cookie("pwd",pwd); response.addCookie(cookie); response.addCookie(cookie2); response.sendRedirect("A.jsp"); %> </body> </html>
标签:text 思路 charset lang 元素 通过 als pos send
原文地址:https://www.cnblogs.com/coder-dai/p/12488643.html