Java教程
第7次
本文主要是介绍第7次，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！
一、教材P78-79 例4-9
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>index.jsp</title>
</head>
<body>
<%double price=2.5; %>
<p style="font-family:宋体;font-size: 25">
商品编号A1001，单价：10<a href="goumai.jsp?id=A1001&price=10">购买</a><br/>
商品编号A1002，单价：<%=price %>
<a href="goumai.jsp?id=A1002&price=<%= price%>">购买</a>
</p>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>goumai.jsp</title> </head>
<body>
<p style="font-family:宋体;font-size: 25">
<%
String id=request.getParameter("id");
String price=request.getParameter("price");
%>
商品编号：<%=id %><br/>
商品单价：<%=price %><br/>
</p>
</body>
</html>
2.教材P97 实验2
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
<head>
<title></title>
</head>
<body>
<form action="2.computer.jsp" method=post name=form>
<p style="font-family:宋体;font-size:18;color:blue">
输入运算数，选择运算符号：<br>
<input type=text name="numberOne" size=6/>
<select name="operator">
<option value="+">加
<option value="-">减
<option value="*">乘
<option value="/">除
</select>
<input type=text name="numberTwo" size=6/><br>
<input type="submit" name="submit" value="提交"/>
</form>
</p>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
<head>
<title></title>
</head>
<body>
<p style="font-family:宋体;font-size:18;color:black">
<%
String numberOne=request.getParameter("numberOne");
String numberTwo=request.getParameter("numberTwo");
String operator=request.getParameter("operator");
if(numberOne==null||numberOne.length()==0){
response.sendRedirect("2.97.jsp");
return;
}else if(numberTwo==null||numberTwo.length()==0){
response.sendRedirect("2.97.jsp");
return;
}
try{
double a=Double.parseDouble(numberOne);
double b=Double.parseDouble(numberTwo);
double r=0;
if(operator.equals("+"))
r=a+b;
else if(operator.equals("-"))
r=a-b;
else if(operator.equals("*"))
r=a*b;
else if(operator.equals("/"))
r=a/b;
out.print(a+""+operator+""+b+"="+r);
}
catch(Exception e){
out.print("请输入数字字符");
}
%>
</p>
</body>
</html>
三、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）
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>denglu.jsp</title>
</head>
<body>
<%
char shu[]={'0','1','2','3','4','5','6','7','8','9'};
String ma="";
for(int i=0;i<4;i++){
ma=ma+shu[(int)(Math.random()*10)];
}
%>
<form action="panduan.jsp" method="post" name="MyJsp">
请输入账号： <input name="name" type="text"/><br/>
请输入密码： <input name="password" type="password"/><br/>
请输入验证码：<input name="number" type="text"/>
<input type="button" name="yanzhengma" value="<%=ma%>"/>
<input type="hidden" name="yanzhengma" value="<%=ma%>"/><br/>
<input type="button" value="登录" onclick="denglu()"/>
<script type="text/javascript">
function denglu(){
if(MyJsp.name.value==""){
alert("账号不能为空！");
return;
}
if(MyJsp.password.value==""){
alert("密码不能为空！");
return;
}
if(MyJsp.number.value==""){
alert("验证码不能为空！");
return;
}
MyJsp.submit();
}
</script>
</form>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>panduan.jsp</title>
</head>
<body>
<%
request.setCharacterEncoding("utf-8");
String name=request.getParameter("name");
String password=request.getParameter("password");
String number=request.getParameter("number");
String yanzhengma=request.getParameter("yanzhengma");
if(name.equals(password)&&number.equals(yanzhengma)){
request.getRequestDispatcher("ok.jsp").forward(request, response);
}else{
request.getRequestDispatcher("no.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>
<title>ok.jsp</title>
</head>
<body>
<h3>登陆成功！</h3>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>no.jsp</title>
</head>
<body>
<h3>登陆失败！</h3>
</body>
</html>
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>
<title></title>
<script type="text/javascript">
function validate(){
if(loginForm.uname.value==""&&loginForm.password.value==""){
alert("账号和密码都不能为空!");
return;
}
if(loginForm.uname.value==""){
alert("账号不能为空!");
return;
}
if(loginForm.password.value==""){
alert("密码不能为空!");
return;
}
loginForm.submit();
}
</script>
</head>
<body>
<form name="loginForm" action="3.test.jsp" method="post">
账号：<input type="text" name="uname"><br>
密码：<input type="password" name="password"><br>
验证码：<input type="text" name="yanzheng"><br>
输入下图中的字符，不区分大小写<br>
<img src="image/35452.png"> <br>
是否注册会员
<input type="checkbox" name="huiyuan" value="yes">是
<input type="checkbox" name="huiyuan" value="no">否<br>
<input type="button" value="登录" onClick="validate()">
</form>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
<head>
<title>登录成功</title>
</head>
<body>
<p style="font-family:宋体;font-size:25;color:blue">登录成功</p>
<%
String huiyuan=request.getParameter("huiyuan");
if(huiyuan.equals("yes"))
out.print("欢迎您成为会员！");
%>
</body>
</html>
五、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 PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>N1.jsp</title>
</head>
<body>
<form action="N2.jsp" method="post">
请输入数字：<input type="text" name="number"/><br/>
<input type="submit" name="ok" value="提交"/>
</form>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>N2.jsp</title>
</head>
<body>
<%
String number=request.getParameter("number");
try{
double a=Double.parseDouble(number);
for(int i=0;i<=a;i++){
out.print("欢迎！"+"<br/>");
}
}catch(NumberFormatException e){
out.print("请输入数字字符");
}
%>
</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"%>
<html>
<head>
<title>页面1</title>
</head>
<body>
<form action="6.yy.jsp">
账号：<input type="text" name="account"><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>
<title>panduan2.jsp</title>
</head>
<body>
<%
request.setCharacterEncoding("utf-8");
String uname=request.getParameter("uname");
String password=request.getParameter("password");
if(uname.equals(password)){
request.getRequestDispatcher("zhuce.jsp").forward(request, response);
}else{
out.print("登陆失败");
}
%>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>zhuce.jsp</title>
</head>
<body>
<%String a=request.getParameter("uname"); %>
<form action="tijiao.jsp" method="post">
请输入姓名：<input type="text" name="name" /><br/>
<input type="hidden" name="b" value="<%=a %>" />
<input type="submit" name="ok" value="提交"/>
</form>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>tijiao.jsp</title>
</head>
<body>
<%
request.setCharacterEncoding("utf-8");
String name=request.getParameter("name");
String uname=request.getParameter("b");
%>
你的账号为：<%=uname %><br/>
你的姓名为：<%=name %>
</body>
</html>
这篇关于第7次的文章就介绍到这儿，希望我们推荐的文章对大家有所帮助，也希望大家多多支持为之网！
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