作者：手机用户2502887447 | 来源：互联网 | 2023-10-10 10:51
1.教材P78-79 例4-9
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
DOCTYPE HTML>
<html>
<head>
<title>首页title>
head>
<body bgcolor="#ffccff">
<%
double price = 98.78;
%>
<p style="font-family: 宋体; font-size: 36; color: blue">
商品编号A1001，价格8765 <a href="receive.jsp?id=A1001&price=8765">购买a><br>
商品编号A1002，价格<%=price%>
<a href="receive.jsp?id=A1002&price=<%=price%>">购买a>
p>
body>
html><%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
DOCTYPE HTML>
<html>
<head>
<title>第二页title>
head>
<body bgcolor="#eeeeff">
<p style="font-family: 宋体; font-size: 36; color: blue">
<%
String id = request.getParameter("id");
String price = request.getParameter("price");
%>
商品编号：<%=id %><br>
商品价格：<%=price %>
p>
body>
html>
2.教材P97 实验2
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
DOCTYPE HTML>
<html>
<head>
<title>首页title>
head>
<body>
输入运算数，选择运算符号：<br>
<form action="jisuan.jsp">
<input type="text" name="num1" >
<select name="fuhao">
<option value="+">加
<option value="-">减
<option value="*">乘
<option value="/">除
select>
<input type="text" name="num2" >
<br><input type="submit" value="提交">
form>
body>
html><%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
DOCTYPE HTML>
<html>
<head>
<title>首页title>
head>
<body>
<%
String num1 = request.getParameter("num1");
String num2 = request.getParameter("num2");
String fuhao = request.getParameter("fuhao");
if (num1 == null || num2 == null || num1.length() == 0
|| num2.length() == 0) {
response.sendRedirect("index.jsp");
return;
}
try {
double a = Double.parseDouble(num1);
double b = Double.parseDouble(num2);
double r = 0;
if ("+".equals(fuhao)) {
r = a + b;
} else if ("-".equals(fuhao)) {
r = a - b;
} else if ("*".equals(fuhao)) {
r = a * b;
} else if ("/".equals(fuhao)) {
r = a / b;
}
out.print(a + "" + fuhao + "" + b + "=" + r);
} catch (Exception e) {
out.print("请输入正确的数字");
}
%>
body>
html>
3.制作一个登陆表单，输入账号和密码，如果账号密码相同，跳转到“登录成功”页面，否则跳转到“登录失败”页面。（加上JS非空验证）（选做，加验证码）
4.在上题的表单中增加一个checkbox,让用户选择“是否注册为会员"，如果注册为会员，则在显示时增加文本“欢迎您注册为会员”。
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
DOCTYPE HTML>
<html>
<head>
<title>注册会员title>
head>
<body>
<script>
function validate() {
if (form.uname.value == "") {
alert("账号不能为空!");
return;
}
if (form.password.value == "") {
alert("密码不能为空!");
return;
}
form.submit();
}
script>
<form name="form" action="../code03/dologin.jsp" method="post">
用户名:<input type="text" name="uname"><br> 密码: <input
type="password" name="password"> <br> 是否注册为会员：<input
type="checkbox" name="member" value="注册">注册 <input
type="checkbox" name="member" value="不注册">不注册<br>
验证码： <input type="text" name="checkcode" size="4" />
<img src="../code03/img.jsp" /><br>
<input type="button" value="登录" onClick="validate()">
form>
body>
html><%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
request.setCharacterEncoding("utf-8");
%>
DOCTYPE HTML>
<html>
<head>
<title>title>
head>
<body>
<%
String uname = request.getParameter("uname");
String password = request.getParameter("password");
String checkcode = request.getParameter("checkcode");
session = request.getSession();
String realcode = (String)session.getAttribute("checkcode");
if (uname.equals(password)&&checkcode.equals(realcode)) {
request.getRequestDispatcher("true.jsp").forward(request,
response);
} else {
request.getRequestDispatcher("false.jsp").forward(request,
response);
}
%>
body>
html><%@page import="javax.imageio.ImageIO"%>
<%@page import="java.awt.image.BufferedImage"%>
<%@ page import="java.awt.*"%>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%!public Color getColor() {
Random ran = new Random();
int R = ran.nextInt(255);
int G = ran.nextInt(255);
int B = ran.nextInt(255);
return new Color(R, G, B);
}
public String codeGenerate() {
int code = (int) (Math.random() * 9000 + 1000);
return String.valueOf(code);
}%>
<%
response.setHeader("Pragma", "no-cache");
response.setHeader("Cache-Control", "no-cache");
response.setHeader("Expires", "0");
BufferedImage image = new BufferedImage(80, 30,
BufferedImage.TYPE_INT_RGB);
Graphics pen = image.getGraphics();
pen.fillRect(0, 0, 80, 30);
pen.setFont(new Font("seif", Font.BOLD, 20));
pen.setColor(Color.BLACK);
String checkCode = codeGenerate();
StringBuffer sb = new StringBuffer();
for (int i = 0; i < checkCode.length(); i++) {
sb.append(checkCode.charAt(i) + " ");
}
pen.drawString(sb.toString(), 15, 20);
for (int i = 0; i < 20; i++) {
Random ran = new Random();
int xBegin = ran.nextInt(80);
int yBegin = ran.nextInt(30);
int xEnd = ran.nextInt(xBegin + 15);
int yEnd = ran.nextInt(yBegin + 15);
pen.setColor(getColor());
pen.drawLine(xBegin, yBegin, xEnd, yEnd);
}
session.setAttribute("checkcode", checkCode);
ImageIO.write(image, "jpeg", response.getOutputStream());
out.clear();
out = pageContext.pushBody();
%>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
request.setCharacterEncoding("utf-8");
%>
DOCTYPE HTML>
<html>
<head>
<title>title>
head>
<body>
<h2>登录成功h2>
<%
String[] member = request.getParameterValues("member");
for (int i = 0; i < member.length; i++) {
if (member[i].equals("注册")) {
out.print("欢迎您注册为会员！");
}
}
%>
body>
html><%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
DOCTYPE HTML>
<html>
<head>
<title>title>
head>
<body>
<h2>登录失败h2>
body>
html>
5.在页面1的表单内输人一个数字N，提交，能够在另一个页面打印N个“欢迎”字符串。
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
DOCTYPE HTML>
<html>
<head>
<title>登录title>
head>
<body>
<form action="print.jsp" method="post">
请输入数字：<input type="text" name="number" size=10><br>
<input type="submit" name="submit" value="提交">
form>
body>
html><%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
request.setCharacterEncoding("utf-8");
%>
DOCTYPE HTML>
<html>
<head>
<title>登录title>
head>
<body>
<%
String number = request.getParameter("number");
int a = Integer.parseInt(number);
for (int i = 0; i < a; i++) {
out.print("欢迎" + "
");
}
%>
body>
html>
6.在页面1中输入账号和密码,进行登录，如果账号和密码相同，则认为成功登录到页面2,在页面2中显示一个文本框输人用户姓名,输人之后提交,在页面3中显示用户的账号和姓名。
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
DOCTYPE HTML>
<html>
<head>
<title>登录title>
head>
<body>
<script>
function validate() {
if (form.account.value == "") {
alert("账号不能为空!");
return;
}
if (form.password.value == "") {
alert("密码不能为空!");
return;
}
form.submit();
}
script>
<form name="form" action="dologin.jsp" method="post">
账号:<input type="text" name="account"><br> 密码: <input
type="password" name="password"> <br> <input type="button"
value="登录" onClick="validate()">
form>
body>
html><%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
request.setCharacterEncoding("utf-8");
%>
DOCTYPE HTML>
<html>
<head>
<title>登录title>
head>
<body>
<%
String account = request.getParameter("account");
String password = request.getParameter("password");
if (account.equals(password)) {
request.getRequestDispatcher("true.jsp").forward(request,
response);
} else {
request.getRequestDispatcher("false.jsp").forward(request,
response);
}
%>
body>
html><%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
request.setCharacterEncoding("UTF-8");
%>
DOCTYPE HTML>
<html>
<head>
<title>title>
head>
<body>
<h2>登录成功h2>
<%
String account = request.getParameter("account");
%>
<form action="show.jsp" method="post">
用户名：<input type="text" name="username"><br> <br> <input
type="submit" name="submit" value="提交"> <input type="hidden"
name="account" value="<%=account%>">
form>
body>
html><%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
DOCTYPE HTML>
<html>
<head>
<title>title>
head>
<body>
<h2>登录失败h2>
body>
html><%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
request.setCharacterEncoding("utf-8");
%>
DOCTYPE HTML>
<html>
<head>
<title>title>
head>
<body>
<%
String account = request.getParameter("account");
String uname = request.getParameter("username");
out.print("账号：" + account + "
" + "
" + "用户名：" + uname);
%>
body>
html>
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