Java开发之JSP行为

作者：网络转载发布时间：[ 2016/8/16 10:38:51 ] 推荐标签：测试开发技术 Java

　　一、Java Bean行文
　　1.重点说明
　　Java Bean行为是一组与Java Bean相关的行为，包括useBean行为、setProperty行为、getProperty行为等。Java Bean是普通的Java类。Java Bean类非常简单，只有私有属性与对应的getter方法和setter方法。（注意：对于boolean类型的属性，习惯上一般把getter方法写成isXxx()，而不是getXxx()）

2.代码实践
　　scope实现各种计数器
　　Counter.java
1 package com.bean;
2
3 public class Counter {
4
5     private int count;         //计数器
6
7     public int getCount(){       //每访问一次，计数器自加1
8         return ++count;
9     }
10     public void setCount(int count){
11         this.count = count;
12     }
13 }
　　Counter.jsp
1 <%@ page language="java" import="java.util.*" pageEncoding="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 'Counter.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     
22
23   </head>
24
25   <body>
26     
27     <jsp:useBean id="personCount" class="com.bean.Counter" scope="session" />
28     
29     <jsp:useBean id="totalCount" class="com.bean.Counter" scope="application" />
30     <div align="center">
31         <form action="page/Counter.jsp" method="get">
32             <fieldset style="width:300">
33                <legend>计数器</legend>
34                <table align="center" width="400">
35                <tr>
36                    <td>您的访问次数：
37                    </td>
38                    <td>
39                        
40                        <jsp:getProperty property="count" name="personCount"/>
41                    </td>
42                </tr>
43                <tr>
44                    <td>总共的访问次数：
45                    </td>
46                    <td>
47                        
48                        <jsp:getProperty property="count" name="totalCount"/>
49                    </td>
50                </tr>
51                <tr>
52                    <td colspan="2">
53                       <input type="submit" value="刷新">
54                    </td>
55                </tr>
56                </table>
57             </fieldset>
58         </form>
59     </div>
60   </body>
61 </html>
　　3.效果截图

二、<jsp:plugin/>嵌入Applet
　　1.重点说明
　　Java Applet是运行在客户端浏览器里的Java小程序。JSP提供了一组plugin行为简化嵌入Applet的操作。plugin行为包括<jsp:plugin/><jsp:params/><jsp:param/><jsp:fallback/>。其中<jsp:plugin/>用于在JSP中定义Java Applet，并声明Applet的宽度和高度等属性；<jsp:params/>用于定义一组一对多的参数；<jsp:param/>用于定义单个的参数；<jsp:fallback/>用于定义不支持Applet时的替代信息。
　　2.程序实践
　　Plugin.jsp
1 <%@ page language="java" import="java.util.*" pageEncoding="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 'Plugin.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     
22
23   </head>
24
25   <body>
26     <table align="center" bgcolor="#999999" cellpadding="1">
27        <tr>
28           <td bgcolor="#FFFFFF">
29               <jsp:plugin
30                    code="Graph.class"
31                    codebase="http://java.sun.com/applets/jdk/1.4/demo/applets/GraphLayout/"
32                    type="applet" width="500" height="400">
33                    <jsp:params>
34                       <jsp:param value="joe-food，joe-dog，joe-tea，table-plate/50"
35                        name="edges"/>
36                    </jsp:params>
37                    <jsp:fallback>您的浏览器不支持Java Applet</jsp:fallback>
38               </jsp:plugin>
39
40           </td>
41        </tr>
42     </table>
43   </body>
44 </html>