第七周

2022-04-17 16:32:12 阅读：133 来源： 互联网

标签：return 第七账号 alert 为空 loginForm 页面

1.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>

  <body>
<% 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="buy.jsp?id=A1001&price=8765">购买</a><br>
  商品编号A1002,价格<%=price %>
 <a href="buy.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>
  <body>
<p style="font-family:宋体;font-size:36;color:blue">
<%
String id=request.getParameter("id"); 
String price=request.getParameter("price"); 
%>

<b>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 PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html> 
  <body>
  <form action="computer.jsp" method=post name=form>
输入运算数,选择运算符号:<br>
<input type=text name="numberOne" size=6/>
<select name="operator">
<option selected="selected" 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>

  </body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html> 
  <body>
<%
String numberOne=request.getParameter("numberOne");
String numberTwo=request.getParameter("numberTwo");
String operator=request.getParameter("operator");
if(numberOne==null||numberOne.length()==0){
response.sendRedirect("input.jsp");
return;
}
else if(numberTwo==null||numberTwo.length()==0){
response.sendRedirect("input.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.println("请输入数字字符");
}
 %>
  </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）

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>

  
  <body>
<script type="text/javascript">
        function validate(){
            if(loginForm.uname.value==""){
                alert("账号不能为空!");
                return;
            }
            if(loginForm.upwd.value==""){
                alert("密码不能为空!");
                return;
            }
            loginForm.submit();
        }
    </script>


    <form name="loginForm" action="dologin.jsp" method="post">
    用户名:<input type="text" name="uname" ><br> 
    密码: <input  type="password" name="upwd" >    <br>
            <input type="button" value="登录" onClick="validate()">    
    </form>
  </body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>

  
  <body>

<% 
request.setCharacterEncoding("utf-8");
String uname=request.getParameter("uname");
   String upwd=request.getParameter("upwd");
if(uname.equals("admin")&&upwd.equals("123456"))

        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>

  
  <body>
   <h1>登陆成功！！</h1>
  </body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>

  
  <body>
    <h1>登陆失败！！</h1>
<a href="login.jsp">去下一页面</a>
  </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"%>


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>

  
  <body>
<script type="text/javascript">
        function validate(){
            if(loginForm.uname.value==""){
                alert("账号不能为空!");
                return;
            }
            if(loginForm.upwd.value==""){
                alert("密码不能为空!");
                return;
            }
            loginForm.submit();
        }
    </script>


    <form name="loginForm" action="dologin.jsp" method="post">
    用户名:<input type="text" name="uname" ><br> 
    密码: <input  type="password" name="upwd" >    <br>
     是否注册为会员:
    <input type="checkbox" name="vip" value="Y"/>注册
    <input type="checkbox" name="vip" value="N"/>再考虑考虑<br>
    <input type="button" value="登录" onClick="validate()">    
    </form>
  </body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>

  
  <body>

<% 
request.setCharacterEncoding("utf-8");
String uname=request.getParameter("uname");
   String upwd=request.getParameter("upwd");
if(uname.equals("admin")&&upwd.equals("123456"))

        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>

  
  <body>
   <h1>登陆成功！！</h1>
   
  <%
    String []vip=request.getParameterValues("vip");
    for(int i=0;i<vip.length;i++){
            if(vip[i].equals("Y")){
            out.print("欢迎您注册为会员");
            }           
        } %>
  </body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>

  
  <body>
    <h1>登陆失败！！</h1>
<a href="login.jsp">去下一页面</a>
  </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 PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
 
  
  <body>
<form action="output.jsp" method="post">
输入一个数字:<br>
<input  type="text" name="num"><br>
 <input type="submit" value="提交" /><br>
</form>


  </body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="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"+" ");
}
%>
  </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 PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>

  
  <body>
<script type="text/javascript">
        function validate(){
            if(loginForm.uacct.value==""){
                alert("账号不能为空!");
                return;
            }
            if(loginForm.upwd.value==""){
                alert("密码不能为空!");
                return;
            }
            loginForm.submit();
        }
    </script>


    <form name="loginForm" action="dologin.jsp" method="post">
    用户名:<input type="text" name="uacct" ><br> 
    密码: <input  type="password" name="upwd" >    <br>
    <input type="button" value="登录" onClick="validate()">    
    </form>
  </body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>

  
  <body>

<% 
request.setCharacterEncoding("utf-8");
String uacct=request.getParameter("uacct");
   String upwd=request.getParameter("upwd");
if(uacct.equals("admin")&&upwd.equals("123456"))

        request.getRequestDispatcher("page-2.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>
  
  <body>
   <%
    String uacct = request.getParameter("uacct");
     %>
<form name="uname" action="page-3.jsp" method="post">
用户姓名:<br>
<input type="text" name="uname"><br>
<input type="submit" value="提交">
 <input name="uacct" type="hidden"  value="<%=uacct%>">
</form>


  </body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  
  <body>
  <%
  String uname=request.getParameter("uname");
  String uacct=request.getParameter("uacct");
   %>
  账号:<%=uacct %><br>
  姓名:<%=uname %>
  
  </body>
</html>

标签：return,第七,账号,alert,为空,loginForm,页面
来源： https://www.cnblogs.com/Astra1208/p/16155989.html

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第七周