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• 编程笔记


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>

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 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>

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 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>

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 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>

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 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>

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 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>

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原创文章，作者：bd101bd101，如若转载，请注明出处：https://blog.ytso.com/tech/pnotes/245158.html

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