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java web的课堂练习-找零钱-学生管理系统

作者:互联网

一、找零钱

<!DOCTYPE html>
<html>
  <body>
    <script type="text/javascript">
    function change()
    {
      money=Number(document.form1.txt1.value);
      if(money!=parseInt(money)||money<1||money>100)
      {
        alert("请输入一个1-100的整数")
      }
      else{
        var a=Math.floor(money/50);
        var b=Math.floor((money-50*a)/20);
        var c=Math.floor((money-50*a-20*b)/10);
        var d=Math.floor((money-50*a-20*b-10*c)/5);
        var e=(money-50*a-20*b-10*c-5*d);
        alert("找零:"+"50元"+a+"张;20元"+b+"张;10元"+c+"张;5元"+d+"张;1元"+e+"张。")       //alert是输出
      }
    }
    </script>
    输入要找的零钱
    <form name="form1">
        <input name="txt1" type="text"><br>
        <input type="button" onclick="change()" value="找零"><br>
    </form>
  </body>
</html>

二、学生管理系统

<%@ 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>
  <body>
  <%
      Class.forName("com.mysql.jdbc.Driver");
      Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/dsschool","root","123");
      Statement stat = conn.createStatement();
      String sql ="SELECT * FROM T_STUDENT";
      ResultSet rs = stat.executeQuery(sql);
      while(rs.next()){
        String stuno = rs.getString("STUNO");
        String stuname = rs.getString("STUNAME");
        String stusex = rs.getString("STUSEX");
        out.println(stuno + " " + stuname + " "+stusex+"<br>");
      }
      stat.close();
      conn.close();
  %>
  </body>
</html>

 

 //同题不同页

<%@ 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>
  <body>
  <script type="text/javascript">
    function validate(){
      if(select.stuname1.value==""){
        alert("查询内容不能为空!");
        return;
      }
      select.submit();
    }
  </script>
  查询学生信息<br>
  <form name="select" action = "ans02_2.jsp"method="post">
  请输入学生姓名:<input type="text" name="stuname1"><br>
  <input type="button" value="查询" onCick="validate()">
  </form>
  </body>
</html>

 

 

<%@ page language="java" import="java.sql.*" 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>
  <body>
  <%request.setCharacterEncoding("utf-8"); %>
    <%
      String stuname1=request.getParameter("stuname1");
      if(stuname1 != null){
        Class.forName("com.mysql.jdbc.Driver");
        Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/dsschool","root","123");
        String sql="SELECT * FROM T_STUDENT where stuname like '%"+stuname1+"%'";
        PreparedStatement stat=conn.prepareStatement(sql);
        ResultSet rs=stat.executeQuery();
        //out.print(sql);
        while(rs.next()){
          String stuno=rs.getString(1);
          String stuname=rs.getString(2);
          String stusex=rs.getString(3);
          out.println(stuno+" " +stuname+" "+stusex+"<BR>");
        }
        stat.close();
        conn.close();
      }
    %>
  </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>
  <body>
    学生登陆<br>
  <form method="post">
    请输入学生学号:<input type ="text" name="stuno"><br>
    请输入学生姓名:<input type ="text" name="stuname"><br>
  <input type ="submit" value="登录">
  </form>
  <%request.setCharacterEncoding("utf-8"); %>
  <%
    String stuno=request.getParameter("stuno");
    String stuname=request.getParameter("stuname");
    if(stuno!=null&&stuname!=null){
      Class.forName("com.mysql.jdbc.Driver");
      Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/dsschool","root","123");
      PreparedStatement stat=null;
      ResultSet rs=null;
      String sql="SELECT *FROM t_STUDENT WHERE STUNO=?&&STUNAME=?";
      stat=conn.prepareStatement(sql);
      stat.setString(1,stuno);
      stat.setString(2,stuname);
      rs=stat.executeQuery();
      if(rs.next()){
        out.println("登陆成功");
      }

      else{
        out.println("登陆失败");
      }
      stat.close();
      conn.close();
    }
  %>
  </body>
</html>

标签:stuname,web,stat,java,课堂练习,rs,request,conn,String
来源: https://www.cnblogs.com/051129-mgzhl/p/16120619.html