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在JSP编程中Application的使用方法详解

JSP调用Javeabean命令UseBean中有Scope设置,一般有 Application session page等设置,Page就是每页重新产生usebean中的javabean新对象,一般情况是用这种,如果多个JSP程序间为共享数据,可以使用 session

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而application的意思,该javabean将一直存在,与session相对用户来说,application是相对应用程序的,一般来说,一个用户有一个session,并且随着用户离开而消失;而application则是一直存在,类似一个servlet程序,类似整个系统的"全局变量",而且只有一个实例。

MVC中控制功能

因此application这个特性,很适合用来做MVC中的控制功能,一般传统MVC是用servlet做控制功能,V基本是JSP页面,M就是中间件Javabean之类。

但是随着JSP功能的完善和推广,逐渐有替代servlet之趋势,我们在实践中更多使用的也是JSP,有时为了省却麻烦的事情,就使用JSP代替servlet.尤其是其控制功能。

实际上,这个控制功能是封装在一个Javabean中,JSP使用scope=application来调用这个Javabean,这样,具备控制功能的javabean就类似servlet常驻内存,并和后台各种中间件交互操作。

“首页”的展现

在实际应用中,我们经常有多个用户要同时访问一个页面,如首页,这个首页中有很多功能要运行,比如目录分类,首页程序要从数据库中读入树形数据并展开,输出到首页,这个功能是封装在Javabean中的。

那么首页JSP调用这个Javabean时,使用scope=application, 再通过树形数据的缓冲算法,这样,多个用户同时访问首页时,首页JSP就无需每次启动Javabean然后再反复读取数据库了。无疑大大提高速度。

所以如果你的首页JSP访问量很高,那么就应该在这方面多花点时间优化。

数据库连接缓冲

 
 
 
  1.  id="cods" 
  2.   class="oracle.jdbc.pool.OracleConnectionCacheImpl"  
  3.   scope="application" /> 
  4.  
  5. <%  
  6. cods.setURL("jdbc:oracle:thin:@HOST:PORT:SID"); 
  7. cods.setUser("scott"); 
  8. cods.setPassword("tiger"); 
  9. cods.setStmtCache (5);  
  10. %> 
  11. event:application_OnStart> 
  12. <%@ page import="java.sql.*, javax.sql.*, oracle.jdbc.pool.*" %> 
  13. * This is a JavaServer Page that uses Connection Caching over 
  14. application 
  15. * scope. The Cache is created in an application scope in 
  16. globals.jsa file.  
  17. * Connection is obtained from the Cache and recycled back once 
  18. done. 
  19.   
  20.   
  21. </strong>  </li> <li>ConnCache JSP  </li> <li><strong> TITLE></strong>  </li> <li><strong> HEAD></strong>  </li> <li><strong><BODY</strong> BGCOLOR=EOFFFO<strong>></strong>   </li> <li><strong><H1></strong> Hello   </li> <li><strong><</strong>%= (request.getRemoteUser() != null? ", " +  </li> <li>request.getRemoteUser() : "") %<strong>></strong>  </li> <li>! I am Connection Caching JSP.  </li> <li><strong> H1></strong>  </li> <li><strong><HR></strong>  </li> <li><strong><B></strong> I get the Connection from the Cache and recycle it back.  </li> <li><strong> B></strong>   </li> <li><strong><P></strong>  </li> <li><strong><</strong>%  </li> <li>try {  </li> <li>Connection conn = cods.getConnection();  </li> <li>Statement stmt = conn.createStatement ();  </li> <li>ResultSet rset = stmt.executeQuery ("SELECT ename, sal " +   </li> <li>"FROM scott.emp ORDER BY ename");  </li> <li>if (rset.next()) {  </li> <li>%<strong>></strong>  </li> <li><strong><TABLE</strong> BORDER=1 BGCOLOR="C0C0C0"<strong>></strong>  </li> <li><strong><TH</strong> WIDTH=200 BGCOLOR="white"<strong>></strong> <strong><I></strong>Employee Name<strong> I></strong> <strong> TH></strong>  </li> <li><strong><TH</strong> WIDTH=100 BGCOLOR="white"<strong>></strong> <strong><I></strong>Salary<strong> I></strong> <strong> TH></strong>  </li> <li><strong><TR></strong> <strong><TD</strong> ALIGN=CENTER<strong>></strong> <strong><</strong>%= rset.getString(1) %<strong>></strong> <strong> TD></strong>  </li> <li><strong><TD</strong> ALIGN=CENTER<strong>></strong> $<strong><</strong>%= rset.getDouble(2) %<strong>></strong> <strong> TD></strong>  </li> <li><strong> TR></strong>  </li> <li><strong><</strong>% while (rset.next()) {  </li> <li>%<strong>></strong>  </li> <li><strong><TR></strong> <strong><TD</strong> ALIGN=CENTER<strong>></strong> <strong><</strong>%= rset.getString(1) %<strong>></strong> <strong> TD></strong>  </li> <li><strong><TD</strong> ALIGN=CENTER<strong>></strong> $<strong><</strong>%= rset.getDouble(2) %<strong>></strong> <strong> TD></strong>  </li> <li><strong> TR></strong>  </li> <li><strong><</strong>% }  </li> <li>%<strong>></strong>  </li> <li><strong> TABLE></strong>  </li> <li><strong><</strong>% }   </li> <li>else {  </li> <li>%<strong>></strong>  </li> <li><strong><P></strong> Sorry, the query returned no rows! <strong> P></strong>  </li> <li><strong><</strong>%   </li> <li>}  </li> <li>rset.close();  </li> <li>stmt.close();  </li> <li>conn.close(); // Put the Connection Back into the Pool  </li> <li>} catch (SQLException e) {  </li> <li>out.println("<strong><P></strong>" + "There was an error doing the query:");  </li> <li>out.println ("<strong><PRE></strong>" + e + "<strong> PRE></strong> n <strong><P></strong>");  </li> <li>}  </li> <li>%<strong>></strong>  </li> <li><strong> BODY></strong>  </li> <li><strong> HTML></strong></li> </ol></pre></p> <br> 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#EEE;font-size:14px;padding:0 12px">内存开销 : 2,228.02 kb</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">查询信息 : 12 queries 5 writes </li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">文件加载 : 36</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">缓存信息 : 0 gets 2 writes </li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">配置加载 : 130</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">会话信息 : SESSION_ID=tp86g2coen2a2imp8gd4vavsa7</li> </ol> </div> <div style="display:none;"> <ol style="padding: 0; margin:0"> <li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/index.php ( 1.12 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/ThinkPHP.php ( 4.61 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Think.class.php ( 12.26 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Storage.class.php ( 1.37 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Storage/Driver/File.class.php ( 3.52 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Mode/common.php ( 2.82 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Common/functions.php ( 53.56 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Hook.class.php ( 4.01 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/App.class.php ( 13.49 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Dispatcher.class.php ( 14.79 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Route.class.php ( 13.36 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Controller.class.php ( 11.23 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/View.class.php ( 7.59 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Behavior/BuildLiteBehavior.class.php ( 3.68 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Behavior/ParseTemplateBehavior.class.php ( 3.88 KB )</li><li style="border-bottom:1px solid 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style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Behavior/ReadHtmlCacheBehavior.class.php ( 5.62 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/App/Home/Controller/ArticleController.class.php ( 6.11 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/App/Home/Controller/CommController.class.php ( 1.60 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Model.class.php ( 60.11 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db.class.php ( 32.43 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db/Driver/Pdo.class.php ( 16.74 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Cache.class.php ( 3.83 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Cache/Driver/File.class.php ( 5.87 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Template.class.php ( 28.16 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Template/TagLib/Cx.class.php ( 22.40 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Template/TagLib.class.php ( 9.16 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/App/Runtime/Cache/Home/7540f392f42b28b481b30614275e4e55.php ( 13.96 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Behavior/WriteHtmlCacheBehavior.class.php ( 0.97 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Behavior/ShowPageTraceBehavior.class.php ( 5.24 KB )</li> </ol> </div> <div style="display:none;"> <ol style="padding: 0; margin:0"> <li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_init ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\BuildLiteBehavior [ RunTime:0.000005s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_init ] --END-- [ RunTime:0.000023s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_begin ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\ReadHtmlCacheBehavior [ RunTime:0.000137s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_begin ] --END-- [ RunTime:0.000174s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ view_parse ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ template_filter ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\ContentReplaceBehavior [ RunTime:0.000048s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ template_filter ] --END-- [ RunTime:0.000066s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\ParseTemplateBehavior [ RunTime:0.003248s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ view_parse ] --END-- [ RunTime:0.003261s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ view_filter ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\WriteHtmlCacheBehavior [ RunTime:0.000063s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ view_filter ] --END-- [ RunTime:0.000073s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_end ] --START--</li> </ol> </div> <div style="display:none;"> <ol style="padding: 0; margin:0"> <li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') LIMIT 1' at line 1 [ SQL语句 ] : SELECT `id`,`pid`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1 </li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') LIMIT 1' at line 1 [ SQL语句 ] : SELECT `id`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1 </li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 1 [ SQL语句 ] : SELECT `id`,`navname` FROM `cx_nav` WHERE ( pid= ) </li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[8] Undefined index: pid /home/wwwroot/jxjierui.cn/App/Home/Controller/ArticleController.class.php 第 47 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[2] file_put_contents(./App/Runtime/Temp/6e48a2cc1223d4214440bf5054323c0f.php): failed to open stream: Permission denied /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Cache/Driver/File.class.php 第 132 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[8] Undefined index: db_host /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db.class.php 第 120 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[8] Undefined index: db_port /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db.class.php 第 121 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[8] Undefined index: db_name /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db.class.php 第 122 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[2] file_put_contents(./App/Runtime/Temp/e6206873e1a98de4442def9a1297d244.php): failed to open stream: Permission denied /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Cache/Driver/File.class.php 第 132 行.</li> </ol> </div> <div style="display:none;"> <ol style="padding: 0; margin:0"> </ol> </div> <div style="display:none;"> <ol style="padding: 0; margin:0"> </ol> </div> </div> </div> <div id="think_page_trace_close" style="display:none;text-align:right;height:15px;position:absolute;top:10px;right:12px;cursor: pointer;"><img style="vertical-align:top;" 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3ukcXd5s7LvLD3me61WkuTCpJzYAyRurMB44EdEJzTfU271lUJC03YjXJXzYOGZwN4D8eB5jlfLrdWfzGRW7icMPfiSO6Oe7s20bmhdgLX4Z23B+s3JgQESzUDiMboSzDMHFpNMwccGePauhfwjzwnI2wu9zKGgEFg80jcZ7MHllk07s1H+5yojtUQTlH4nFdLKTGwDmPbIklOb1L1zO4T6N8NCuDLFLS/C63c0eNRimZ++s5BMBHxU11jHchI9oFVUxRh/eMDzHEzGYu0Lg8gJ7oS/tFCwoic44fyUtix0n/46vP4bf+//BRgAYwDDar4ncHIAAAAASUVORK5CYII="></div> 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