JAVA遇见HTML——JSP篇（2、JSP基础语法）

 1 <%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>
 2 <%
 3 String path = request.getContextPath();
 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
 5 %>
 6 
 7 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 8 <html>
 9   <head>
10     <base href="<%=basePath%>">
11     
12     <title>My JSP 'index.jsp' starting page</title>
13     <meta http-equiv="pragma" content="no-cache">
14     <meta http-equiv="cache-control" content="no-cache">
15     <meta http-equiv="expires" content="0">    
16     <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
17     <meta http-equiv="description" content="This is my page">
18     <!--
19     <link rel="stylesheet" type="text/css" href="styles.css">
20     -->
21   </head>
22   
23   <body>
24     <h1>大家好</h1>
25     <hr>
26     <!-- 我是HTML注释，在客户端可见 -->
27     <%-- 我是JSP注释，在客户端不可见 --%>
28     <%! 
29        String s = "张三";  //声明了一个字符串变量
30        int add(int x,int y) //声明了一个返回整型的函数，实现两个整数的求和。
31        {
32           return x+y;
33        }
34     %>
35     
36     <% 
37        //单行注释
38        /*多行注释*/
39        out.println("大家好，欢迎大家学习JAVAEE开发。");
40     %>
41     <br>
42         你好，<%=s %><br>
43     x+y=<%=add(10,5) %><br>    
44   </body>
45 </html>

JSP内置out对象

 1 <%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>
 2 <%
 3 String path = request.getContextPath();
 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
 5 %>
 6 
 7 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 8 <html>
 9   <head>
10     <base href="<%=basePath%>">
11     
12     <title>My JSP 'exercise.jsp' starting page</title>
13     
14     <meta http-equiv="pragma" content="no-cache">
15     <meta http-equiv="cache-control" content="no-cache">
16     <meta http-equiv="expires" content="0">    
17     <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
18     <meta http-equiv="description" content="This is my page">
19     <!--
20     <link rel="stylesheet" type="text/css" href="styles.css">
21     -->
22 
23   </head>
24   
25   <body>
26     <%!
27        //返回九九乘法表对应的HTML代码，通过表达式来调用，在页面上显示 
28        String printMultiTable1()
29        {
30           String s = "";
31           for(int i=1;i<=9;i++)
32           {
33              for(int j=1;j<=i;j++)
34              {
35                 s+=j+"*"+i+"="+(i*j)+"&nbsp;&nbsp;&nbsp;&nbsp;";
36              }
37              s+="<br>"; //追加换行标签
38           }
39           return s;
40        }
41        
42        //JSP内置out对象，使用脚本方式调用，打印九九乘法表
43        void printMultiTable2(JspWriter out) throws Exception
44        {
45            for(int i=1;i<=9;i++)
46            {
47              for(int j=1;j<=i;j++)
48              {
49                 out.println(j+"*"+i+"="+(i*j)+"&nbsp;&nbsp;&nbsp;&nbsp;");
50              }
51              out.println("<br>"); //追加换行标签
52           }
53        }
54        
55     %>
56     <h1>九九乘法表</h1>
57     <hr>
58     <!-- 使用表达式来调用 -->
59     <%=printMultiTable1()%>
60     <br>
61     <!-- 使用脚本方式调用 -->
62     <% printMultiTable2(out);%>
63     <br>
64     <!-- 使用脚本方式调用printMultiTable1()，这种方式不行 -->
65     <% printMultiTable1();%>
66     <br>
67     
68   </body>
69 </html>

posted on 2018-10-07 21:01 songsong_p_blue 阅读(322) 评论(0) 编辑收藏举报