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 heretitle> 8 head> 9 <body> 10 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 heretitle> 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("x=
"+x+""); 15 out.println("info=
"+info+""); 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 heretitle> 8 head> 9 <body> 10 11 <%! public static final String INFO = "www.mldnjava.cn"; %> 12 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 heretitle> 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 heretitle> 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 heretitle> 8 head> 9 <body> 10 11 12 13 14 15 16 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 heretitle> 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 heretitle> 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 heretitle> 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> 37 <td>雇员编号td> 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> 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.htmfont> 3 h2>
info.jsp
1 <h2> 2 <font color="green"><%="info.jsp" %>font> 3 h2>
info.inc
1 <h2> 2 <font color="blue">info.incfont> 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 heretitle> 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 heretitle> 8 head> 9 <body> 10 <h1>静态包含操作h1> 11 <jsp:include page="info.htm"/> 12 <jsp:include page="info.jsp"/> 13 <jsp:include page="info.inc"/> 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 heretitle> 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> 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 heretitle> 8 head> 9 <body> 10 <% 11 int x = 100; 12 %> 13 <h1>include_demo04.jsp -- <%=x %>h1> 14 <%@include file="include.jsp" %> 15 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 heretitle> 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 heretitle> 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 heretitle> 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"> --%> 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> 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>