Thinking

?1/**//*?Licence:
?2*???Use?this?however/wherever?you?like,?just?don't?blame?me?if?it?breaks?anything.
?3*
?4*?Credit:
?5*???If?you're?nice,?you'll?leave?this?bit:
?6*
?7*???Class?by?Pierre-Alexandre?Losson?--?http://www.telio.be/blog
?8*???email?:?plosson@users.sourceforge.net
?9*/
10function?refreshProgress()
11{
12????UploadMonitor.getUploadInfo(updateProgress);
13}
14
15function?updateProgress(uploadInfo)
16{
17????if?(uploadInfo.inProgress)
18????{
19????????document.getElementById('uploadbutton').disabled?=?true;
20????????document.getElementById('file1').disabled?=?true;
21
22????????var?fileIndex?=?uploadInfo.fileIndex;
23
24????????var?progressPercent?=?Math.ceil((uploadInfo.bytesRead?/?uploadInfo.totalSize)?*?100);
25
26????????document.getElementById('progressBarText').innerHTML?=?'upload?in?progress:?'?+?progressPercent?+?'%';
27
28????????document.getElementById('progressBarBoxContent').style.width?=?parseInt(progressPercent?*?3.5)?+?'px';
29
30????????window.setTimeout('refreshProgress()',?1000);
31????}
32????else
33????{
34????????document.getElementById('uploadbutton').disabled?=?false;
35????????document.getElementById('file1').disabled?=?false;
36????}
37
38????return?true;
39}
40
41function?startProgress()
42{
43????document.getElementById('progressBar').style.display?=?'block';
44????document.getElementById('progressBarText').innerHTML?=?'upload?in?progress:?0%';
45????document.getElementById('uploadbutton').disabled?=?true;
46
47????//?wait?a?little?while?to?make?sure?the?upload?has?started?..
48????window.setTimeout("refreshProgress()",?1500);
49????return?true;
50}
51

?1<%
?2????String?path?=?request.getContextPath();
?3????String?basePath?=?request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
?4%>
?5<script?src="<%=basePath%>common/js/upload.js">?</script>
?6<script?src="<%=basePath%>dwr/interface/UploadMonitor.js">?</script>
?7<script?src="<%=basePath%>dwr/engine.js">?</script>
?8<script?src="<%=basePath%>dwr/util.js">?</script>
?9<style?type="text/css">
10????body?{?font:?11px?Lucida?Grande,?Verdana,?Arial,?Helvetica,?sans?serif;?}
11????#progressBar?{?padding-top:?5px;?}
12????#progressBarBox?{?width:?350px;?height:?20px;?border:?1px?inset;?background:?#eee;}
13????#progressBarBoxContent?{?width:?0;?height:?20px;?border-right:?1px?solid?#444;?background:?#9ACB34;?}
14</style>
15
16<div?id="progressBar"?style="display:?none;">
17????<div?id="theMeter">
18????????<div?id="progressBarText"></div>
19????????<div?id="progressBarBox">
20????????????<div?id="progressBarBoxContent"></div>
21????????</div>
22????</div>
23</div>

在dwr.xml?中的配置：

?1<?xml?version="1.0"?encoding="UTF-8"?>
?2<!DOCTYPE?dwr?PUBLIC?"-//GetAhead?Limited//DTD?Direct?Web?Remoting?2.0//EN"?
?3"http://getahead.ltd.uk/dwr/dwr20.dtd">
?4<dwr>
?5????<allow>
?6????????<create?creator="new"?javascript="UploadMonitor"?scope="script">
?7????????????<param?name="class"?value="be.telio.mediastore.ui.upload.UploadMonitor"/>
?8????????</create>
?9????????<convert?converter="bean"?match="be.telio.mediastore.ui.upload.UploadInfo"/>
10????</allow>
11</dwr>

?1<servlet>
?2????<servlet-name>dwr-invoker</servlet-name>
?3????<servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>
?4????<init-param>
?5??????<param-name>debug</param-name>
?6??????<param-value>false</param-value>
?7????</init-param>
?8????<init-param>
?9??????<param-name>pollAndCometEnabled</param-name>
10??????<param-value>true</param-value>
11????</init-param>
12????<init-param>
13??????<param-name>allowGetForSafariButMakeForgeryEasier</param-name>
14??????<param-value>true</param-value>
15????</init-param>
16????<load-on-startup>2</load-on-startup>
17??</servlet>
18
19??<servlet-mapping>
20????<servlet-name>dwr-invoker</servlet-name>
21????<url-pattern>/dwr/*</url-pattern>
22??</servlet-mapping>

### direct log messages to stdout ###
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### direct messages to file hibernate.log ###
#log4j.appender.file=org.apache.log4j.FileAppender
#log4j.appender.file.File=hibernate.log
#log4j.appender.file.layout=org.apache.log4j.PatternLayout
#log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### set log levels - for more verbose logging change 'info' to 'debug' ###
log4j.rootLogger=info, stdout

#hibernate log level
log4j.logger.org.hibernate=error

#struts log level
#log4j.logger.org.apache.struts=error

#spring log level
#log4j.logger.org.springframework=error

#oscache log level
log4j.logger.com.opensymphony.oscache=error

?

昨天看了一天的EJB，才剛剛對(duì)EJB的流程有了一點(diǎn)了解，現(xiàn)在總結(jié)出來，請(qǐng)大家多多指教：

1、創(chuàng)建自己的Bean(現(xiàn)在我只學(xué)習(xí)了一個(gè)會(huì)話Bean的例子)，其中包含商務(wù)方法的實(shí)現(xiàn)；

（2--5的操作可由容器自動(dòng)完成，如WebLogic中的Build EJB，如果在MyEclipse中，可以在生成Bean的時(shí)候選擇是用XDoclet自動(dòng)生成以下接口）

2、創(chuàng)建遠(yuǎn)程接口（繼承自EJBObject），其中包括商務(wù)方法的空實(shí)現(xiàn)（必須拋出遠(yuǎn)程異常），客戶端通過該接口與EJB對(duì)象交互，

??? 它的具體實(shí)現(xiàn)由EJB容器供應(yīng)商實(shí)現(xiàn)，實(shí)現(xiàn)的對(duì)象就是EJB對(duì)象，它擁有對(duì)實(shí)際Bean的引用；

3、創(chuàng)建Home接口（繼承自EJBHome），其中至少包含一個(gè)create()方法，這個(gè)方法返回EJB對(duì)象，并拋出遠(yuǎn)程異常，

??? 它的作用相當(dāng)于EJB對(duì)象的生成庫；

（4和5是可選的操作，本地用戶可以通過這些接口而不是遠(yuǎn)程接口來調(diào)用Bean）

4、創(chuàng)建本地接口（繼承自EJBLocalObject），方法跟遠(yuǎn)程接口中的相當(dāng)，只是不需要拋出遠(yuǎn)程異常；

5、創(chuàng)建本地Home接口（繼承自EJBLocalHome），方法跟Home接口相當(dāng)，同樣不需要拋出遠(yuǎn)程異常；

6、如果采用自動(dòng)生成接口的話，同時(shí)會(huì)在META-INF生成下生成多個(gè)XML配置文件：

??ejb-jar.xml：它是EJB規(guī)范中要求的配置，是容器無關(guān)的。下面是一個(gè)實(shí)際配置的例子

?1 < ejb-jar >
?2 ?? < enterprise-beans >
?3
?4 <! -配置會(huì)話Bean- >
?5 ???? < session >
?6 ?????? < ejb-name > HelloBean </ ejb-name >
?7 ?????? < home > bean.HelloHome </ home >
?8 ?????? < remote > bean.HelloObject </ remote >
?9 ?????? < ejb-class > bean.HelloBean </ ejb-class >
10 ?????? < session-type > Stateless </ session-type >
11 ?????? < transaction-type > Container </ transaction-type >
12 ???? </ session >
13
14 ???? < entity >
15 <! -配置實(shí)體Bean- >
16 ???? </ entity >
17 ?? </ enterprise-beans >
18 </ ejb-jar >
19

?還有一個(gè)與特定容器相關(guān)的配置文件：

如WebLogic中配置文件為weblogic-ejb-jar.xml，下面是一個(gè)實(shí)際配置的例子：

1 < weblogic-ejb-jar >
2 ?? < weblogic-enterprise-bean >
3 ???? < ejb-name > HelloBean </ ejb-name >
4 ???? < stateless-session-descriptor >
5 ???? </ stateless-session-descriptor >
6 ?????? < jndi-name > ejb.helloJNDI </ jndi-name >
7 ?? </ weblogic-enterprise-bean >
8 ? < weblogic-ejb-jar >

在Jboss則會(huì)有相應(yīng)的配置文件。

7、現(xiàn)在我們看到我們的Bean、Home接口、EJBObject接口已經(jīng)與特定的命名綁定；

8、現(xiàn)在客戶端要調(diào)用Bean中的某個(gè)商務(wù)方法：

• 通過JNDI查找到Home對(duì)象，獲得它的引用；
• Home對(duì)象是EJB對(duì)象的生成庫，由它創(chuàng)建生成新的EJB對(duì)象；
• 客戶端調(diào)用EJB對(duì)象的商務(wù)方法；
• EJB對(duì)象將請(qǐng)求委托給實(shí)際的Bean；
• Bean實(shí)現(xiàn)商務(wù)方法。

?