JSP学习笔记（一）

注释：

1.单行注释或者//

 1 <%@ page language="java" import="java.util.*" contentType="text/html; utf-8""%>
 2 
 3 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 4 <html>
 5   <head>
 6     <base href="<%=basePath%>">
 7     
 8     <title>My JSP 'HelloWorld.jsp' starting page</title>
 9     
10     <meta http-equiv="pragma" content="no-cache">
11     <meta http-equiv="cache-control" content="no-cache">
12     <meta http-equiv="expires" content="0">    
13     <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
14     <meta http-equiv="description" content="This is my page">
15     <!--
16     <link rel="stylesheet" type="text/css" href="styles.css">
17     -->
18     <title>
19         Hello,World
20     </title>
21   </head>
22   
23   <body>
24   <!-- 打印Hello World -->
25      <%
26          out.print("Hello,world!");
27       %>
28   </body>
29 </html>

2.多行注释<% %>

 1 <%@ page language="java" import="java.util.*" contentType="text/html; utf-8""%>
 2 
 3 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 4 <html>
 5   <head>
 6     <base href="<%=basePath%>">
 7     
 8     <title>My JSP 'HelloWorld.jsp' starting page</title>
 9     
10     <meta http-equiv="pragma" content="no-cache">
11     <meta http-equiv="cache-control" content="no-cache">
12     <meta http-equiv="expires" content="0">    
13     <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
14     <meta http-equiv="description" content="This is my page">
15     <!--
16     <link rel="stylesheet" type="text/css" href="styles.css">
17     -->
18     <title>
19         Hello,World
20     </title>
21   </head>
22   
23   <body>
24   <%-- 
25           打印
26           Hello,world!
27   --%>
28      <%
29          out.print("Hello,world!");
30       %>
31   </body>
32 </html>

JSP脚本元素

1.JSP声明<%! %>

2.JSP表达式<%= %>

3.JSP Scriptlets<% %>

 1 <%@ page language="java" import="java.util.*" contentType="text/html; utf-8"%>
 2 
 3 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 4 <html>
 5   <head>
 6     
 7     <title>My JSP 'HelloWorld.jsp' starting page</title>
 8     
 9     <meta http-equiv="pragma" content="no-cache">
10     <meta http-equiv="cache-control" content="no-cache">
11     <meta http-equiv="expires" content="0">    
12     <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
13     <meta http-equiv="description" content="This is my page">
14     <!--
15     <link rel="stylesheet" type="text/css" href="styles.css">
16     -->
17     <title>
18         JSP脚本元素
19     </title>
20   </head>
21   
22   <body>
23     <%! 
24         int num1=1;
25         int num2=2;    
26         int num3;
27         int add(int num1,int num2)
28         {
29             return num1+num2;
30         }
31     %>
32     <%
33         num3=num1+num2;
34     %>
35      num1+num2=<%=add(num1,num2) %>
36      <br>
37      num3=<% out.println(num3);%>
38   </body>
39 </html>