java
Login.jsp
[html] view plaincopy01.<%@ page language="java" import="java.util.*,java.net.*" contentType="text/html; charset=utf-8"%>
02.<%
03.String path = request.getContextPath();
04.String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
05.%>
06.
07.<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
08.<html>
09. <head>
10. <base href="<%=basePath%>">
11.
12. <title>My JSP 'index.jsp' starting page</title>
13. <meta http-equiv="pragma" content="no-cache">
14. <meta http-equiv="cache-control" content="no-cache">
15. <meta http-equiv="expires" content="0">
16. <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
17. <meta http-equiv="description" content="This is my page">
18. <!--
19. <link rel="stylesheet" type="text/css" href="styles.css">
20. -->
21. </head>
22.
23. <body>
24. <h1>用户登录</h1>
25. <hr>
26. <%
27. request.setCharacterEncoding("utf-8");
28. String username="";
29. String password = "";
30. Cookie[] cookies = request.getCookies();
31. if(cookies!=null&&cookies.length>0)
32. {
33. for(Cookie c:cookies)
34. {
35. if(c.getName().equals("username"))
36. {
37. username = URLDecoder.decode(c.getValue(),"utf-8");
38. }
39. if(c.getName().equals("password"))
40. {
41. password = URLDecoder.decode(c.getValue(),"utf-8");
42. }
43. }
44. }
45. %>
46. <form name="loginForm" action="dologin.jsp" method="post">
47. <table>
48. <tr>
49. <td>用户名：</td>
50. <td><input type="text" name="username" value="<%=username %>"/></td>
51. </tr>
52. <tr>
53. <td>密码：</td>
54. <td><input type="password" name="password" value="<%=password %>" /></td>
55. </tr>
56. <tr>
57. <td colspan="2"><input type="checkbox" name="isUseCookie" checked="checked"/>十天内记住我的登录状态</td>
58. </tr>
59. <tr>
60. <td colspan="2" align="center"><input type="submit" value="登录"/>
61. <input type="reset" value="取消"/></td>
62. </tr>
63. </table>
64. </form>
65. </body>
66.</html>
doLogin.jsp
[html] view plaincopy01.<%@ page language="java" import="java.util.*,java.net.*" contentType="text/html; charset=utf-8"%>
02.<%
03.String path = request.getContextPath();
04.String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
05.%>
06.
07.<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
08.<html>
09. <head>
10. <base href="<%=basePath%>">
11.
12. <title>My JSP 'dologin.jsp' starting page</title>
13.
14. <meta http-equiv="pragma" content="no-cache">
15. <meta http-equiv="cache-control" content="no-cache">
16. <meta http-equiv="expires" content="0">
17. <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
18. <meta http-equiv="description" content="This is my page">
19. <!--
20. <link rel="stylesheet" type="text/css" href="styles.css">
21. -->
22.
23. </head>
24.
25. <body>
26. <h1>登录成功</h1>
27. <hr>
28. <br>
29. <br>
30. <br>
31. <%
32. request.setCharacterEncoding("utf-8");
33. //首先判断用户是否选择了记住登录状态
34. String[] isUseCookies = request.getParameterValues("isUseCookie");
35. if(isUseCookies!=null&&isUseCookies.length>0)
36. {
37. //把用户名和密码保存在Cookie对象里面
38. String username = URLEncoder.encode(request.getParameter("username"),"utf-8");
39. //使用URLEncoder解决无法在Cookie当中保存中文字符串问题
40. String password = URLEncoder.encode(request.getParameter("password"),"utf-8");
41.
42. Cookie usernameCookie = new Cookie("username",username);
43. Cookie passwordCookie = new Cookie("password",password);
44. usernameCookie.setMaxAge(864000);
45. passwordCookie.setMaxAge(864000);//设置最大生存期限为10天
46. response.addCookie(usernameCookie);
47. response.addCookie(passwordCookie);
48. }
49. else
50. {
51. Cookie[] cookies = request.getCookies();
52. if(cookies!=null&&cookies.length>0)
53. {
54. for(Cookie c:cookies)
55. {
56. if(c.getName().equals("username")||c.getName().equals("password"))
57. {
58. c.setMaxAge(0); //设置Cookie失效
59. response.addCookie(c); //重新保存。
60. }
61. }
62. }
63. }
64. %>
65. <a href="users.jsp" target="_blank">查看用户信息</a>
66.
67. </body>
68.</html>
user.jsp
[html] view plaincopy01.<%@ page language="java" import="java.util.*,java.net.*" contentType="text/html; charset=utf-8"%>
02.<%
03.String path = request.getContextPath();
04.String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
05.%>
06.
07.<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
08.<html>
09. <head>
10. <base href="<%=basePath%>">
11.
12. <title>My JSP 'users.jsp' starting page</title>
13.
14. <meta http-equiv="pragma" content="no-cache">
15. <meta http-equiv="cache-control" content="no-cache">
16. <meta http-equiv="expires" content="0">
17. <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
18. <meta http-equiv="description" content="This is my page">
19. <!--
20. <link rel="stylesheet" type="text/css" href="styles.css">
21. -->
22.
23. </head>
24.
25. <body>
26. <h1>用户信息</h1>
27. <hr>
28. <%
29. request.setCharacterEncoding("utf-8");
30. String username="";
31. String password = "";
32. Cookie[] cookies = request.getCookies();
33. if(cookies!=null&&cookies.length>0)
34. {
35. for(Cookie c:cookies)
36. {
37. if(c.getName().equals("username"))
38. {
39. username = URLDecoder.decode(c.getValue(),"utf-8");
40. }
41. if(c.getName().equals("password"))
42. {
43. password = URLDecoder.decode(c.getValue(),"utf-8");
44. }
45. }
46. }
47. %>
48. <BR>
49. <BR>
50. <BR>
51. 用户名：<%=username %><br>
52. 密码：<%=password %><br>
53. </body>
54.</html>
本篇文章来源于 黑基网-中国最大的网络安全站点 原文链接：http://www.hackbase.com/tech/2014-12-29/70233.html