第二周作业

1.p39 实验2 显示当前时间，并输出上午(0-12)好,下午好(13-17),晚上好(18-23)

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

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>    
    <title>text2</title>    
  </head>
  
  <body>
    <%
        Calendar c=Calendar.getInstance();
        int h=c.get(Calendar.HOUR_OF_DAY);
        int m=c.get(Calendar.MINUTE);
        int s=c.get(Calendar.SECOND);        
     %>
     <h1>
         用户在
     <%=h%>:<%=m%>:<%=s%>
        访问了网页。
    </h1><br>
    <%
    if(h>=0&&h<=12){
    %>
    上午好
    <%}else if(h>=13&&h<=17){　　　　//JAVA注释
    %>
     下午好
    <%}else{ %>
     晚上好
     <%} %>
  </body>
</html>

2. 使用声明方法,在页面调用该方法,判断2023是不是闰年

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
     
  </head>
  <!--HTML注释语句-->
  <body>
      <h1>判断闰年</h1>
    <%!
    String panduan(int a){
        if((a%4==0&&a%100!=0)||a%400==0){
            return "闰年";
        }else{
            return "平年";
        }
    }
     %>
     <%
     int a=2023;
     out.print("2023为"+panduan(a));
      %>
  </body>
</html>

3.表达式+程序段循环输出5条hr,长度分别为100px-500px
<hr width="<%=i%>"

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

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    
  </head>
  
  <body>
      
    <%
    for(int i=100;i<=500;i=i+100){    
     %>
     <hr width="<%=i%>" /><br>
     <%} %>
  </body>
</html>

3.表达式+程序段循环输出5条hr,长度分别为100px-500px
<hr width="<%=i%>"

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

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    
  </head>
  
  <body>
      
    <%
    for(int i=100;i<=500;i=i+100){    
     %>
     <hr width="<%=i%>" /><br>
     <%} %>
  </body>
</html>