新手学Html之JSP——入门（一）
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2023-04-04 17:45:59
JSP基础语法 JSP注释 comment.jsp 1 <%@ page language="java" contentType="text/html; charset=UTF-8" 2 pageEncoding="UTF-8"%> 3
jsp注释
comment.jsp
1 <%@ page language="java" contenttype="text/html; charset=utf-8" 2 pageencoding="utf-8"%> 3 <!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd"> 4 <html> 5 <head> 6 <meta http-equiv="content-type" content="text/html; charset=utf-8"> 7 <title>insert title here</title> 8 </head> 9 <body> 10 <!-- 这个注释客户端可以看见 --> 11 <%-- jsp中的注释，客户端无法看见 --%> 12 <% 13 //java中的单行注释，客户端无法看见 14 /* 15 java中的多行注释，客户端无法看见 16 */ 17 %> 18 </body> 19 </html>
scriptlet
scriptlet_demo01.jsp
1 <%@ page language="java" contenttype="text/html; charset=utf-8"
2 pageencoding="utf-8"%>
3 <!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd">
4 <html>
5 <head>
6 <meta http-equiv="content-type" content="text/html; charset=utf-8">
7 <title>insert title here</title>
8 </head>
9 <body>
10 <%
11 //定义局部变量，编写语句
12 int x = 10;
13 string info = "www.mldnjava.cn";
14 out.println("<h2>x="+x+"</h2>");
15 out.println("<h2>info="+info+"</h2>");
16 %>
17 </body>
18 </html>
scriptlet_demo02.jsp
1 <%@ page language="java" contenttype="text/html; charset=utf-8" 2 pageencoding="utf-8"%> 3 <!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd"> 4 <html> 5 <head> 6 <meta http-equiv="content-type" content="text/html; charset=utf-8"> 7 <title>insert title here</title> 8 </head> 9 <body> 10 <!-- 定义全局变量，方法，类 --> 11 <%! public static final string info = "www.mldnjava.cn"; %> 12 <!-- 用于输出一个变量或一个具体的常量 --> 13 <%=1 %><br/> 14 <%=info %> 15 </body> 16 </html>
尽量不要使用system.out.print();进行输出
input_table_value.jsp
1 <%@ page language="java" contenttype="text/html; charset=utf-8" 2 pageencoding="utf-8"%> 3 <!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd"> 4 <html> 5 <head> 6 <meta http-equiv="content-type" content="text/html; charset=utf-8"> 7 <title>insert title here</title> 8 </head> 9 <body> 10 <form action="print_table.jsp" method="post"> 11 <table border="1" width="100%"> 12 <tr> 13 <td>输入表格的行数：</td> 14 <td><input type="text" name="row"></td> 15 </tr> 16 <tr> 17 <td>输入表格的列数：</td> 18 <td><input type="text" name="col"></td> 19 </tr> 20 <tr> 21 <td> 22 <input type="submit" value="显示"> 23 <input type="reset" value="重置"> 24 </td> 25 </tr> 26 </table> 27 </form> 28 </body> 29 </html>
print_table.jsp
1 <%@ page language="java" contenttype="text/html; charset=utf-8"
2 pageencoding="utf-8"%>
3 <!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd">
4 <html>
5 <head>
6 <meta http-equiv="content-type" content="text/html; charset=utf-8">
7 <title>insert title here</title>
8 </head>
9 <body>
10 <%
11 int rows = 0;
12 int cols = 0;
13 //读取input_table_value.jsp post的row和col，将之强制转换为int类型
14 try{
15 rows = integer.parseint(request.getparameter("row"));
16 cols = integer.parseint(request.getparameter("col"));
17 }catch(exception e){}
18 if(rows>0&&cols>0){
19 %>
20 <table border="1" width="100%">
21 <%
22 for(int x = 1;x <= rows; x++){
23 %>
24 <tr>
25 <%
26 for(int y = 1; y <= cols; y++){
27 %>
28 <td> <%=x%> * <%=y%> = <%=(x * y)%></td>
29 <%
30 }
31 %>
32 </tr>
33 <%
34 }
35 %>
36 </table>
37 <a href="input_table_value.jsp"><input type="button" value="返回"></a>
38 <%
39 }else{
40 %>
41 <%--输入不符合时弹出对话框指示，并自动返回到输入数值处 --%>
42 <script type="text/javascript" language="javascript">
43 alert("输入不合法！");
44 /* alert(document.location === window.location);//true */
45 //window.location.href="input_table_value.jsp";
46 //document.location.href="input_table_value.jsp";
47 //以上两种好像等价，待探索
48 window.document.location.href="input_table_value.jsp";
49 </script>
50 <%
51 }
52 %>
53 </body>
54 </html>
scriptlet标签
此标签具有和<% %>一样的效果，更加美观一些，无强制要求
scriptlet_tag.jsp
1 <jsp:scriptlet> 2 string url = "www.mldnjava.cn"; 3 </jsp:scriptlet> 4 <h2><%=url %></h2>
page指令
设置页面的mime、文件编码
page_demo01.jsp
1 <%@ page language="java" contenttype="application/msword; charset=utf-8"
2 pageencoding="utf-8"%>
3 <!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd">
4 <html>
5 <head>
6 <meta http-equiv="content-type" content="text/html; charset=utf-8">
7 <title>insert title here</title>
8 </head>
9 <body>
10 <!-- pageencoding是jsp文件本身的编码，contenttype是服务器发送给客户端的内容编码 -->
11
12 <!-- txt text/plain -->
13 <!-- doc application/msword -->
14 <!-- png image/png -->
15 <!-- jpg/jpeg image/jpeg -->
16 <!-- htm/html text/html-->
17 <table border="1">
18 <%
19 //指定文件下载后的保存名称是mldn.doc
20 response.setheader("content-disposition", "attachment;filename=mldn.doc");
21 %>
22 <tr><td>欢迎大家</td></tr>
23 <tr><td>欢迎大家！！</td></tr>
24 <tr><td>欢迎大家！！！</td></tr>
25 </table>
26 </body>
27 </html>
错误页的设置
服务器端跳转
1 <%@ page language="java" contenttype="text/html; charset=utf-8" 2 pageencoding="utf-8"%> 3 <%@ page errorpage="error.jsp" %> 4 <%-- 出现错误将会跳转到error.jsp --%> 5 6 <!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd"> 7 <html> 8 <head> 9 <meta http-equiv="content-type" content="text/html; charset=utf-8"> 10 <title>insert title here</title> 11 </head> 12 <body> 13 <% 14 int result = 10 / 0; 15 %> 16 <%=result %> 17 </body> 18 </html>
error.jsp
1 <%@ page language="java" contenttype="text/html; charset=utf-8" 2 pageencoding="utf-8"%> 3 <%@ page iserrorpage="true" %> 4 <%-- 表示出现错误该页面可以处理错误 --%> 5 <% response.setstatus(200); %> 6 <%-- 设置了200的http状态码，表示本页没有错误，防止tomcat也认为本页出现了错误，从而无法显示 --%> 7 <!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd"> 8 <html> 9 <head> 10 <meta http-equiv="content-type" content="text/html; charset=utf-8"> 11 <title>insert title here</title> 12 </head> 13 <body> 14 <h1>程序出现了错误！</h1> 15 </body> 16 </html>
数据库连接操作
page指令使用import导入所需要的java开发包
mldn.sql
1 /*
2 navicat mysql data transfer
3
4 source server : myproject
5 source server version : 50562
6 source host : localhost:3306
7 source database : mldn
8
9 target server type : mysql
10 target server version : 50562
11 file encoding : 65001
12
13 date: 2019-04-27 02:23:48
14 */
15
16 set foreign_key_checks=0;
17
18 -- ----------------------------
19 -- table structure for emp
20 -- ----------------------------
21 drop table if exists `emp`;
22 create table `emp` (
23 `empno` int(4) not null,
24 `ename` varchar(10) default null,
25 `job` varchar(9) default null,
26 `hiredate` date default null,
27 `sal` float(7,2) default null,
28 primary key (`empno`)
29 ) engine=innodb default charset=utf8;
30
31 -- ----------------------------
32 -- records of emp
33 -- ----------------------------
34 insert into `emp` values ('6060', '李兴华', '经理', '2001-09-16', '2000.30');
35 insert into `emp` values ('7369', '董鸣楠', '销售', '2003-10-09', '1500.90');
36 insert into `emp` values ('7698', '张惠', '销售', '2005-03-12', '800.00');
37 insert into `emp` values ('7762', '刘明', '销售', '2005-03-09', '1000.00');
38 insert into `emp` values ('7782', '杨军', '分析员', '2005-01-12', '2500.00');
39 insert into `emp` values ('7839', '王月', '经理', '2006-09-01', '2500.00');
40 insert into `emp` values ('8964', '李祺', '分析员', '2003-10-01', '3000.00');
将mysql的驱动"mysql-connector-java-5.1.47-bin.jar"复制到tomcat\lib 目录中，重启服务器
使用jsp列出emp表数据
驱动程序使用
com.mysql.jdbc.driver
list_emp.jsp
1 <%@page import="org.apache.tomcat.dbcp.dbcp2.pstmtkey"%>
2 <%@page import="com.sun.crypto.provider.rsacipher"%>
3 <%@ page language="java" contenttype="text/html; charset=utf-8"
4 pageencoding="utf-8"%>
5 <%@ page import="java.sql.*" %>
6 <!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd">
7 <html>
8 <head>
9 <meta http-equiv="content-type" content="text/html; charset=utf-8">
10 <title>insert title here</title>
11 </head>
12 <body>
13 <%!
14 //定义数据库驱动程序
15 public static final string dbdriver = "com.mysql.jdbc.driver";
16 //数据库连接地址
17 public static final string dburl = "jdbc:mysql://localhost:3306/mldn";
18 public static final string dbuser = "root";
19 public static final string dbpass = "2580";
20 %>
21 <%
22 connection conn = null; //声明数据库连接对象
23 preparedstatement pstmt = null; //声明数据库操作
24 resultset rs = null; //声明数据库结果集
25 %>
26 <%
27 try{ //数据库操作中会出现异常，所以要使用try...catch处理
28 class.forname(dbdriver); //数据库驱动程序加载
29 conn = drivermanager.getconnection(dburl, dbuser, dbpass);//取得数据库连接
30 string sql = "select empno,ename,job,sal,hiredate from emp";
31 pstmt = conn.preparestatement(sql); //实例化preparestatement对象
32 rs = pstmt.executequery(); //执行查询操作
33 %>
34 <center>
35 <table border="1" width="80%">
36 <tr> <!-- 输出表格的行显示 -->
37 <td>雇员编号</td> <!-- 输出表格的行显示信息 -->
38 <td>雇员姓名</td>
39 <td>雇员工作</td>
40 <td>雇员工资</td>
41 <td>雇佣日期</td>
42 </tr>
43 <%
44 while(rs.next()){
45 int empno = rs.getint(1); //循环emp表中的行记录
46 string ename = rs.getstring(2); //取出雇员编号
47 string job = rs.getstring(3); //取出雇员姓名
48 float sal = rs.getfloat(4); //取出雇员工作
49 java.util.date date = rs.getdate(5);//取出雇佣日期
50 %>
51 <tr> <!-- 循环输出雇员的信息 -->
52 <td><%=empno %></td>
53 <td><%=ename %></td>
54 <td><%=job %></td>
55 <td><%=sal %></td>
56 <td><%=date %></td>
57 </tr>
58 <%
59 }
60 %>
61 </table>
62 </center>
63 <%
64 }catch(exception e){ //异常处理
65 system.out.println(e); //向tomcat中打印
66 }finally{
67 rs.close();
68 pstmt.close();
69 conn.close();
70 }
71 %>
72 </body>
73 </html>
包含指令
info.htm
1 <h2> 2 <font color="red">info.htm</font> 3 </h2>
info.jsp
1 <h2> 2 <font color="green"><%="info.jsp" %></font> 3 </h2>
info.inc
1 <h2> 2 <font color="blue">info.inc</font> 3 </h2>
静态包含
先包含，再处理
include_demo01.jsp
1 <%@ page language="java" contenttype="text/html; charset=utf-8" 2 pageencoding="utf-8"%> 3 <!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd"> 4 <html> 5 <head> 6 <meta http-equiv="content-type" content="text/html; charset=utf-8"> 7 <title>insert title here</title> 8 </head> 9 <body> 10 <h1>静态包含操作</h1> 11 <%@include file="info.htm" %> 12 <%@include file="info.jsp" %> 13 <%@include file="info.inc" %> 14 </body> 15 </html>
动态包含
先处理，再包含
include_demo02.jsp
1 <%@ page language="java" contenttype="text/html; charset=utf-8" 2 pageencoding="utf-8"%> 3 <!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd"> 4 <html> 5 <head> 6 <meta http-equiv="content-type" content="text/html; charset=utf-8"> 7 <title>insert title here</title> 8 </head> 9 <body> 10 <h1>静态包含操作</h1> 11 <jsp:include page="info.htm"/> <!-- 此处为标签指令，必须完结 --> 12 <jsp:include page="info.jsp"/> <!-- 此处为标签指令，必须完结 --> 13 <jsp:include page="info.inc"/> <!-- 此处为标签指令，必须完结 --> 14 </body> 15 </html>
使用request.getparameter()方法进行参数的传递
receive_param.jsp
1 <%@ page language="java" contenttype="text/html; charset=utf-8"
2 pageencoding="utf-8"%>
3 <h1>参数一：<%=request.getparameter("name") %></h1>
4 <h1>参数二：<%=request.getparameter("info") %></h1>
include_demo03.jsp
1 <%@ page language="java" contenttype="text/html; charset=utf-8" 2 pageencoding="utf-8"%> 3 <!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd"> 4 <html> 5 <head> 6 <meta http-equiv="content-type" content="text/html; charset=utf-8"> 7 <title>insert title here</title> 8 </head> 9 <body> 10 <% 11 string username="lixinhua"; //定义一个变量 12 %> 13 <h1>动态包含并传递参数</h1> 14 <jsp:include page="receive_param.jsp"> 15 <jsp:param value="<%=username %>" name="name"/> 16 <jsp:param value="www.mldnjava.cn" name="info"/> 17 </jsp:include> <!-- 此处为标签完结指令，必须完结 --> 18 </body> 19 </html>
静态包含与动态包含的优劣之分
静态包含处理页 include_demo04.jsp（错误的页面）
1 <%@ page language="java" contenttype="text/html; charset=utf-8" 2 pageencoding="utf-8"%> 3 <!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd"> 4 <html> 5 <head> 6 <meta http-equiv="content-type" content="text/html; charset=utf-8"> 7 <title>insert title here</title> 8 </head> 9 <body> 10 <% 11 int x = 100; 12 %> 13 <h1>include_demo04.jsp -- <%=x %></h1> 14 <%@include file="include.jsp" %> 15 <!-- 运行出现500错误，因为静态包含时，先将全部的内容包含到一起，然后再编译，导致了x的多次定义出错 --> 16 </body> 17 </html>
动态包含处理页 include_demo05.jsp
1 <%@ page language="java" contenttype="text/html; charset=utf-8" 2 pageencoding="utf-8"%> 3 <!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd"> 4 <html> 5 <head> 6 <meta http-equiv="content-type" content="text/html; charset=utf-8"> 7 <title>insert title here</title> 8 </head> 9 <body> 10 <% 11 int x = 100; 12 %> 13 <h1>include_demo05.jsp -- <%=x %></h1> 14 <jsp:include page="include.jsp"></jsp:include> 15 </body> 16 </html>
跳转指令
服务器跳转，页面地址未发生改变
不传递参数时
1 <jsp:forword page="{要包含的文件路径|<%=表达式 %>}"/>
传递参数时（中间不能有空格）
1 <jsp:forward> 2 <jsp:param name="参数名称" value="参数内容"/> 3 </jsp:forward>
forward_demo01.jsp
1 <%@ page language="java" contenttype="text/html; charset=utf-8" 2 pageencoding="utf-8"%> 3 <!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd"> 4 <html> 5 <head> 6 <meta http-equiv="content-type" content="text/html; charset=utf-8"> 7 <title>insert title here</title> 8 </head> 9 <body> 10 <% 11 string username = "lixinhua"; 12 %> 13 <jsp:forward page="forward_demo02.jsp"> 14 <jsp:param value="<%=username %>" name="name"/> 15 <jsp:param value="www.mldnjava.cn" name="info"/> 16 </jsp:forward> 17 </body> 18 </html>
forward_demo02.jsp
1 <%@ page language="java" contenttype="text/html; charset=utf-8"
2 pageencoding="utf-8"%>
3 <!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd">
4 <html>
5 <head>
6 <meta http-equiv="content-type" content="text/html; charset=utf-8">
7 <title>insert title here</title>
8 </head>
9 <body>
10 <h1>这是跳转之后的页面</h1>
11 <h2>参数一：<%=request.getparameter("name") %></h2>
12 <h2>参数二：<%=request.getparameter("info") %></h2>
13 </body>
14 </html>
实例操作：用户登录程序实现（jsp+jdbc实现）
创建数据库表
1 /*
2 navicat mysql data transfer
3
4 source server : myproject
5 source server version : 50562
6 source host : localhost:3306
7 source database : mldn
8
9 target server type : mysql
10 target server version : 50562
11 file encoding : 65001
12
13 date: 2019-04-27 03:28:48
14 */
15
16 set foreign_key_checks=0;
17
18 -- ----------------------------
19 -- table structure for user
20 -- ----------------------------
21 drop table if exists `user`;
22 create table `user` (
23 `userid` varchar(30) not null,
24 `name` varchar(30) not null,
25 `password` varchar(32) not null,
26 primary key (`userid`)
27 ) engine=innodb default charset=utf8;
28
29 -- ----------------------------
30 -- records of user
31 -- ----------------------------
32 insert into `user` values ('admin', 'administrator', 'admin');
登录界面
login.html
1 <!doctype html> 2 <html> 3 <head> 4 <meta charset="utf-8"> 5 <title>请登录...</title> 6 </head> 7 <body> 8 <center> 9 <h1>登录操作</h1> 10 <hr> 11 <form action="login_check.jsp" method="post"> 12 <table border="1"> 13 <tr> 14 <td colspan="2"><center>用户登录</center></td> 15 </tr> 16 <tr> 17 <td>登录id：</td> 18 <td><input type="text" name="id"></td> 19 </tr> 20 <tr> 21 <td>登录密码：</td> 22 <td><input type="password" name="password"></td> 23 </tr> 24 <tr> 25 <td colspan="2"> 26 <input type="submit" value="登录"> 27 <input type="reset" value="重置"> 28 </td> 29 </tr> 30 </table> 31 </form> 32 <hr> 33 </center> 34 </body> 35 </html>
校验界面
login_check.jsp
1 <%@ page language="java" contenttype="text/html; charset=utf-8"
2 pageencoding="utf-8"%>
3 <%@ page import="java.sql.*" %>
4 <!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd">
5 <html>
6 <head>
7 <meta http-equiv="content-type" content="text/html; charset=utf-8">
8 <title>登录校验</title>
9 </head>
10 <body>
11 <%!
12 //定义数据库驱动程序
13 public static final string dbdriver = "com.mysql.jdbc.driver";
14 //数据库连接地址
15 public static final string dburl = "jdbc:mysql://localhost:3306/mldn";
16 public static final string dbuser = "root";
17 public static final string dbpass = "2580";
18 %>
19 <%
20 connection conn = null; //声明数据库连接对象
21 preparedstatement pstmt = null; //声明数据库操作
22 resultset rs = null; //声明数据库结果集
23 boolean flag = false; //标志位
24 string name = null; //接收用户的真实姓名
25 %>
26 <% //jdbc会抛出异常，使用try...catch处理
27 try{
28 class.forname(dbdriver); //加载驱动程序
29 conn = drivermanager.getconnection(dburl, dbuser, dbpass);//取得数据库连接
30 //编写要使用的sql语句，验证用户id和密码，如果正确，则取出真实姓名
31 string sql = "select name from user where userid=? and password=?";
32 pstmt = conn.preparestatement(sql); //实例化preparestatement对象
33 pstmt.setstring(1, request.getparameter("id")); //设置查询所需要的内容
34 pstmt.setstring(2, request.getparameter("password")); //设置查询所需要的内容
35 rs = pstmt.executequery(); //执行查询操作
36 if(rs.next()){ //如果可以查询到，则表示合法用户
37 name = rs.getstring(1); //取出真实姓名
38 flag = true; //修改标志位，如果为true，表示登录成功
39 }
40 }catch(exception e){
41 system.out.println(e);
42 }finally{
43 try{ //关闭操作会抛出异常，使用try...catch处理
44 rs.close(); //关闭查询对象
45 pstmt.close(); //关闭操作对象
46 conn.close(); //关闭数据库连接
47 }catch(exception e){}
48 }
49 %>
50 <%
51 if(flag){ //登录成功，跳转到成功页
52 %>
53 <%-- <jsp:forward page="login_success.jsp"> --%> <!-- 执行跳转操作 -->
54 <%-- <jsp:param value="<%=name %>" name="uname"/> --%>
55 <%-- </jsp:forward> --%>
56 <%
57 response.setheader("refresh", "3;url=login_success.jsp"); //定时跳转
58 session.setattribute("uname", name);
59 %>
60 <h3>用户如果登录成功，三秒后跳转到欢迎页！</h3>
61 <h3>如果没用跳转，请按<a href="login_success.jsp">这里</a></h3>
62 <%
63 }else{//登陆失败，跳转到失败页
64 %>
65 <jsp:forward page="login_failure.jsp"></jsp:forward><!-- 执行跳转操作 -->
66 <%
67 }
68 %>
69 </body>
70 </html>
登陆成功页面
login_success.jsp
1 <%@ page language="java" contenttype="text/html; charset=utf-8"
2 pageencoding="utf-8"%>
3 <!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd">
4 <html>
5 <head>
6 <meta http-equiv="content-type" content="text/html; charset=utf-8">
7 <title>欢迎您，<%=session.getattribute("uname")%></title>
8 </head>
9 <body>
10 <center>
11 <%
12 if(session.getattribute("uname") != null){ //已经设置过属性，所以不为空
13 %>
14 <h1>登录操作</h1>
15 <hr>
16 <h2>登录成功</h2>
17 <h2>欢迎<%=session.getattribute("uname")%>光临本系统，<a href="logout.jsp">注销</a>!</h2>
18 <%
19 }else{ //非法用户，没有登陆过，session中没有userid的存在
20 %>
21 <h3>请先进行系统的<a href="login.html">登录</a>!</h3>
22 <%
23 }
24 %>
25
26 <%-- <h2>欢迎<font color="red"><%=request.getparameter("uname") %></font>光临！</h2> --%>
27 </center>
28 </body>
29 </html>
登录失败页面
login_failure.jsp
1 <%@ page language="java" contenttype="text/html; charset=utf-8" 2 pageencoding="utf-8"%> 3 <!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd"> 4 <html> 5 <head> 6 <meta http-equiv="content-type" content="text/html; charset=utf-8"> 7 <title>登陆失败</title> 8 </head> 9 <body> 10 <center> 11 <h1>登录操作</h1> 12 <h2>登录失败，请重新<a href="login.html">登录</a></h2> 13 </center> 14 </body> 15 </html>
退出页面
logout.jsp
1 <%@ page language="java" contenttype="text/html; charset=utf-8"
2 pageencoding="utf-8"%>
3 <!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd">
4 <html>
5 <head>
6 <title>已退出系统</title>
7 </head>
8 <body>
9
10 <h3>亲爱的<%=session.getattribute("uname")%>，您已成功退出本系统，三秒后跳转回登录界面!</h3>
11 <h3>若果没有跳转，请按<a href="login.html">这里</a></h3>
12
13 <%
14 response.setheader("refresh", "3;url=login.html"); //定时跳转
15 session.invalidate(); //注销，session清空
16 %>
17
18 </body>
19 </html>
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