第七周作业
1.教材P78-79 例4-9
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <html> <head> </head> <body> <% double price=98.78; %> 商品编号A1001，价格8765 <a href="index.jsp?id=A1001&price=8765">购买</a><br> 商品编号A1002，价格<%=price %> <a href="index.jsp?id=A1002&price=<%=price %>">购买</a><br> </body> </html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
</head>
<body>
<%
String id=request.getParameter("id");
String price=request.getParameter("price");
%>
<b>商品编号：<%= id %></b>
商品价格：<%= price %>
</body>
</html>
2.教材P97 实验2
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<body>
<form action="index.jsp">
<p style="font-family: 宋体;font-size: 18; color:yellow">
输入运算数，选择运算符号：
<input type="text" name="one" size=6/>
<select name="op">
<option value="+">加</option>
<option value="-">减</option>
<option value="*">乘</option>
<option value="/">除</option>
</select>
<input type="text" name="two" size=6/>
<br><input type="submit" value="提交"/>
</form>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<body>
<p style="font-family: 宋体;font-size: 18; color:black">
<%
String one=request.getParameter("one");
String two=request.getParameter("two");
String op=request.getParameter("op");
if(one==null||one.length()==0){
response.sendRedirect("Copy of index.jsp");
return;
}
else if(two==null||two.length()==0){
response.sendRedirect("Copy of index.jsp");
return;
}
double a=Double.parseDouble(one);
double b=Double.parseDouble(two);
double r=0;
try{
if(op.equals("+")){
r=a+b;
}
else if(op.equals("-")){
r=a-b;
}else if(op.equals("*")){
r=a*b;
}else if(op.equals("/")){
r=a/b;
}
out.print(a+op+b+"="+r);
}
catch(Exception e){
out.print("输入数字字符");
}
%>
</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"%>
<html>
<head>
</head>
<body>
<script type="text/javascript">
function validate() {
if (loginForm.account.value == "") {
alert("账号不能为空！");
return;
} else if (loginForm.password.value == "") {
alert("密码不能为空！");
return;
}
loginForm.submit();
}
</script>
<form action="index.jsp" name="loginForm" method="post">
<p style="font-family: 宋体;font-size: 18; color:blue">
输入账号：<input name="account" type="text" /><br>
输入密码:<input name="password" type="password" /><br>
是否注册会员：
<input type="checkbox" name="yes" value="1"/>注册
<input type="checkbox" name="yes" value="2"/>不注册<br>
<input type="button" value="登录"onClick="validate()">
</form>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
<head>
</head>
<body>
<h1>登录成功</h1>
<%
String []yes=request.getParameterValues("yes");
for(int i=0;i<yes.length;i++){
if(yes[i].equals("1")){
out.print("注册为会员");
}
}
%>
</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"%>
<%
request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<body>
<form action="index.jsp" name ="logindo">
<p style="font-family: 宋体;font-size: 18; color:red">
请输入数字
<input type="text" name="num" size=6/>
<br><input type="submit" value="提交"/>
</form>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<body>
<%
String num=request.getParameter("num");
int n=Integer.parseInt(num);
for(int i=0;i<n;i++){
out.print("欢迎"+"</br>");
}
%>
</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。
（转发）request.getRequestDispacher.....forward
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
</head>
<body>
<script>
function lg() {
if (form.user.value == "") {
alert("用户名不能为空!");
form.user.focus();
return;
}
if (form.password.value == "") {
alert("密码不能为空!");
form.password.focus();
return;
}
}
</script>
<form action="index.jsp" method="post" name="form">
账号：<input type="text" name="user"/><br>
密码：<input type="password" name="password"/><br>
<input type="submit" value="登录"/>
</form>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
</head>
<body>
<%
request.setCharacterEncoding("UTF-8");
String user=request.getParameter("user");
String password=request.getParameter("password");
if(user.equals(password)){
request.getRequestDispatcher("index1.jsp").forward(request, response);
}
else{
request.getRequestDispatcher("index2.jsp").forward(request, response);
}
%>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
</head>
<body>
<%
request.setCharacterEncoding("UTF-8");
String user=request.getParameter("user");
%>
<h1> 登陆成功！</h1>
<form action="index3.jsp" method="post" name="form">
用户姓名：<input type="text" name="username"/><br>
<input type="submit" value="提交"/><br>
<input type="hidden" name="user" value="<%= user %>"/>
</form>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
</head>
<body>
<%
request.setCharacterEncoding("UTF-8");
%>
<h1> 登陆失败！</h1>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
</head>
<body>
<%
request.setCharacterEncoding("UTF-8");
String user=request.getParameter("user");
String username=request.getParameter("username");
out.print("账号："+user+"</br>"+"用户姓名:"+"   "+username);
%>
</body>
</html>
