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CCP Review-Javascript

lixw — Tue, 27 Nov 2007 15:41:00 GMT

CCP Review-Javascript
1、对于div中的input标签�Q�如果div的style.display属性�ؓ'none'�Q�那么调用input标签的focus�Ҏ��在IE6.0上会报错�Q�首先应该让其display属性�ؓ''或�?block'再调用；
2、当HTML元素的name属性唯一时可以利用document.getElementById()调用获得�q�个元素�Q?br /> 3、如果异步提交耗时较长�Q�可在异步提交之前显�C�等待提�C�，在回调函��C��Ҏ��q�回值更新提�C�；
4、在JS中function也是可以作�ؓ变量的，所以我们可以在自己��装的框架中预留回调函数供自定义使用�Q�如下面的代码：

1 //common.js
2 var callback = null;
3 function commonUse(){
4
5   if(typeof(callback) == "function"){
6     callback();
7   }
8
9 }
10
11 //self.js
12 function selfUse(){
13
14   callback = function(){
15     //do something before
16   }
17   commonUse();
18
19 }

5、JS中可以��用正则表辑ּ�来校验数字域、日期域和EMail�{�。代码示例如下：
校验日期的例子：

1     function isDate(date){
2         //�Ҏ��期格式进行验�?nbsp;要求�?000-2099�q?nbsp; 格式�?nbsp;yyyy-mm-dd �q�且可以正常转换成正��的日期
3         var regex=/^(19|20)\d{2}-((0[1-9]{1})|(1[0-2]{1}))-((0[1-9]{1})|([1-2]{1}[0-9]{1})|(3[0-1]{1}))$/;
4
5         if(!regex.test(date)){
6             return false;
7         }
8         var arr_=date.split("-");
9         var tmp = new Date(arr_[0], parseFloat(arr_[1])-1, parseFloat(arr_[2]));
10         if(tmp.getFullYear()!=parseFloat(arr_[0])
11             || tmp.getMonth()!=parseFloat(arr_[1])-1
12             || tmp.getDate()!=parseFloat(arr_[2])){
13             return false;
14         }
15
16          return true;
17     }

�q�篇文章有详�l�的说明�Q?a target="_blank" href="http://www.tkk7.com/byterat/archive/2006/12/20/89143.html">http://www.tkk7.com/byterat/archive/2006/12/20/89143.html
�q�本电子书是讲解正则表达式的�Q?a target="_blank" href="http://www.tkk7.com/Files/kawaii/RegularExpressions.zip">http://www.tkk7.com/Files/kawaii/RegularExpressions.zip
6、在JS�~�码中，如果代码量较大，要注意防止function名称重复�Q�包括直接在��面上编写的和引用外部JS文�g的，不然会出��C��些莫名奇妙的问题�Q?br /> 7、注意JS代码中的函数�q�回语句return的��用；
8、尽量把JS代码写在外部公共的文件中�Q�而在��面中引入，好处有：a.函数复用�Q�b.JS文�g�~�存�Q�c.提供��面解析速度。基于b�Q�我们在修改JS代码后，要看IE的设�|�是否将原先的JS文�g�~�存造成问题�Q?br /> 9、对于同一个页面的多个表单提交�Q�我们可以在�W�一个表单中讄��相应的隐藏域�Q�在表单提交之前利用JS脚本把其他表单的数据讄��到第一个表单的隐藏域中�Q?br /> 10、对于异步校验的文本框，我们一般设�|�触发事件�ؓonblur而不是onchange或者onpropertychange�Q�以减少客户端和服务器的交互�ơ数�Q�但应该注意如果�q�个文本框最初没有获得焦点，那么onblur��׃��会触发，可以先调用以下onfocus�Q�再调用onblur手动触发�Q?br /> 11、JS中不存在trim()函数�Q�自定义如下�Q?br />

1 //JS去除首尾�I�格�Q�同VBS的Trim)
2     function trim(inputString) {
3         if (typeof inputString != "string") {
4             return inputString;
5         }
6         var retValue = inputString;
7         var ch = retValue.substring(0, 1);
8         while (ch == " ") {
9                //��查字�W�串开始部分的�I�格
10             retValue = retValue.substring(1, retValue.length);
11             ch = retValue.substring(0, 1);
12         }
13         ch = retValue.substring(retValue.length-1, retValue.length);
14         while (ch == " ") {
15             //��查字�W�串�l�束部分的空�?/span>
16             retValue = retValue.substring(0, retValue.length-1);
17             ch = retValue.substring(retValue.length-1, retValue.length);
18         }
19         while (retValue.indexOf("  ") != -1) {
20             //��文字中间多个相�q�的�I�格变�ؓ一个空�?/span>
21             retValue = retValue.substring(0, retValue.indexOf("  "))
22                 + retValue.substring(retValue.indexOf("  ")+1, retValue.length);
23         }
24         return retValue;
25     }

12、JS中显�C�模式窗口，代码如下�Q?br />

1 function showMyDialog(){
2   var dialogProperty = 'dialogWidth:800px;dialogHeight:600px;status:no';
3   var windowProperty = "height=800,width=800,status=no,toolbar=no,menubar=yes,location=yes,resizable=yes,scrollbars=yes";
4
5   var url = "SomeAction.do?id="+id+"&flag=true";
6   var returnVal = window.showModalDialog(url,"", dialogProperty);
7   if(typeof(returnVal) == "undefined"){
8     return;
9   }
10   if(returnVal !=  ""){
11     //do something
12   }
13 }
14

在新打开的模式窗口中�Q�我们通过window.returnValue讄��q�回��|��然后在父��面中我们通过returnVal可以拿到�q�回倹{�?br />

lixw 2007-11-27 23:41 发表评论

DB2常用命��o

lixw — Fri, 27 Apr 2007 00:54:00 GMT

1�Q?启动数据�?nbsp;
db2start
2�Q?停止数据�?nbsp;
db2stop
3�Q?�q�接数据�?nbsp;
db2   connect   to   o_yd   user   db2   using   pwd
4�Q?��L��据库��理�E�序配置
db2   get   dbm   cfg
5�Q?写数据库��理�E�序配置
db2   update   dbm   cfg   using   参数�?nbsp; 参数�?nbsp;
6�Q?��L��据库的配�|?nbsp;
db2   connect   to   o_yd   user   db2   using   pwd
db2   get   db   cfg   for   o_yd
7�Q?写数据库的配�|?nbsp;
db2   connect   to   o_yd   user   db2   using   pwd
db2   update   db   cfg   for   o_yd   using   参数�?nbsp; 参数�?nbsp;
8�Q?关闭所有应用连�?nbsp;
db2   force   application   all
db2   force   application   ID1,ID2,,,Idn   MODE   ASYNC
(db2   list   application   for   db   o_yd   show   detail)
9�Q?备䆾数据�?nbsp;
db2   force   application   all
db2   backup   db   o_yd   to   d:
(db2   initialize   tape   on   \\.\tape0)
(db2   rewind   tape   on   \\.\tape0)
db2   backup   db   o_yd   to   \\.\tape0
10�Q?恢复数据�?nbsp;
db2   restore   db   o_yd   from   d:   to   d:
db2   restore   db   o_yd   from   \\.\tape0   to   d:
11�Q?�l�定存储�q�程
db2   connect   to   o_yd   user   db2   using   pwd
db2   bind   c:\dfplus.bnd
拯��存储�q�程到服务器上的C:\sqllib\function目录�?nbsp;
12�Q?整理�?nbsp;
db2   connect   to   o_yd   user   db2   using   pwd
db2   reorg   table   ydd
db2   runstats   on   table   ydd   with   distribution   and   indexes   all
13�Q?导出表数�?nbsp;
db2   export   to   c:\sw.txt   of   del   select   *   from   dftz
db2   export   to   c:\sw.ixf   of   ixf   select   *   from   dftz
14�Q?导入表数�?nbsp;
db2   import   from   c:\sw.txt   of   del   insert   into   ylbx.czyxx
db2   import   to   c:\sw.txt   of   del   commitcount   5000   messages       c:\dftz.msg   insert   into   dftz
db2   import   to   c:\dftz.ixf   of   ixf   commitcount   5000   messages   c:\dftz.msg   insert   into   dftz
db2   import   to   c:\dftz.ixf   of   ixf   commitcount   5000   insert   into   dftz
db2   import   to   c:\dftz.ixf   of   ixf   commitcount   5000   insert_update   into   dftz
db2   import   to   c:\dftz.ixf   of   ixf   commitcount   5000   replace   into   dftz
db2   import   to   c:\dftz.ixf   of   ixf   commitcount   5000   create   into   dftz       (仅IXF)
db2   import   to   c:\dftz.ixf   of   ixf   commitcount   5000   replace_create   into   dftz     (仅IXF)
15�Q?执行一个批处理文�g
db2   –tf   批处理文件名
�Q�文件中每一条命令用   �Q�结束）
16�Q?自动生成批处理文�?nbsp;
建文本文�Ӟ��temp.sql
select   'runstats   on   table   DB2.'   ||   tabname   ||   '   with   distribution   and   detailed   indexes   all;'   from   syscat.tables   where   tabschema='DB2'   and   type='T';
db2   –tf   temp.sql>runstats.sql
17�Q?自动生成��Q�视图）语句
在服务器上：C:\sqllib\misc目录�?nbsp;
db2   connect   to   o_yd   user   db2   using   pwd
db2look   –d   o_yd   –u   db2   –e   –p   –c   c:\o_yd.txt
db2look   -d   lys   -e   -a   -x   -i   db2admin   -o   c:\aa.txt
18�Q?其他命��o
grant   dbadm   on   database   to   user   bb
19.    select   *   from   czyxx   fetch   first   1   rows   only
20.    db2look   –d   lys   –u   db2admin   –w   –asd   –a   –e   –o   c:\mytable.txt

lixw 2007-04-27 08:54 发表评论

lixw — Wed, 25 Apr 2007 09:34:00 GMT

1.在应用程序中使用日志的三个目的：
应用�E�序中添加日志的三个目的�Q�监视代码中变量的变化情况，周期性的记录到文件中供其他应用进行统计分析工作；
跟踪代码�q�行时轨�q�，作�ؓ日后审计的依据；
担当集成开发环境中的调试器的作用，向文件或控制台打��C��码的调试信息�?br>
2.log4j�׃��个重要的�l��g构成�Q�日志信息的优先�U�，日志信息的输出目的地�Q�日志信息的输出格式�?br>使用Java�Ҏ��文件做为配�|�文件的�Ҏ��Q?br>2.1. 配置根Logger�Q�其语法为：
log4j.rootLogger = [ level ] , appenderName, appenderName, ...
其中�Q�level 是日志记录的优先�U�，分�ؓOFF、FATAL、ERROR、WARN、INFO、DEBUG、ALL或者您定义的��别�?br>Log4j��只��用四个��别，优先�U�从高到低分别是ERROR、WARN、INFO、DEBUG�?br>通过在这里定义的�U�别�Q�您可以控制到应用程序中相应�U�别的日志信息的开兟�?br>比如在这里定义了INFO�U�别�Q�则应用�E�序中所有DEBUG�U�别的日志信息将不被打印出来�?br>appenderName��是指定日志信息输出到哪个地斏V��您可以同时指定多个输出目的地�?br>2.2. 配置日志信息输出目的地Appender�Q�其语法�?br>log4j.appender.appenderName = fully.qualified.name.of.appender.class
log4j.appender.appenderName.option1 = value1
...
log4j.appender.appenderName.option = valueN

其中�Q�Log4j提供的appender有以下几�U�：
org.apache.log4j.ConsoleAppender�Q�控制台�Q�，
org.apache.log4j.FileAppender�Q�文�Ӟ��Q?br>org.apache.log4j.DailyRollingFileAppender�Q�每天��生一个日志文�Ӟ��Q?br>org.apache.log4j.RollingFileAppender�Q�文件大��到达指定尺寸的时候��生一个新的文�Ӟ��Q?br>org.apache.log4j.WriterAppender�Q�将日志信息以流格式发送到��L��指定的地方）

2.3. 配置日志信息的格式（布局�Q�，其语法�ؓ�Q?br>log4j.appender.appenderName.layout = fully.qualified.name.of.layout.class
log4j.appender.appenderName.layout.option1 = value1
...
log4j.appender.appenderName.layout.option = valueN

其中�Q�Log4j提供的layout有以下几�U�：
org.apache.log4j.HTMLLayout�Q�以HTML表格形式布局�Q�，
org.apache.log4j.PatternLayout�Q�可以灵�z�d��指定布局模式�Q�，
org.apache.log4j.SimpleLayout�Q�包含日志信息的�U�别和信息字�W�串�Q�，
org.apache.log4j.TTCCLayout�Q�包含日志��生的旉��、线�E�、类别等�{�信息）

3.在代码中使用Log4j,下面��讲�q�在�E�序代码中怎样使用Log4j�?br>
3.1.得到记录�?br>使用Log4j�Q�第一步就是获取日志记录器�Q�这个记录器��负责控制日志信息。其语法为：
public static Logger getLogger( String name)�Q?br>通过指定的名字获得记录器�Q�如果必要的话，则�ؓ�q�个名字创徏一个新的记录器。Name一般取本类的名字，比如�Q?br>static Logger logger = Logger.getLogger ( ServerWithLog4j.class.getName () ) ;

3.2.��d��配置文�g
当获得了日志记录器之后，�W�二步将配置Log4j环境�Q�其语法为：
BasicConfigurator.configure ()�Q?自动快速地使用�~�省Log4j环境�?br>PropertyConfigurator.configure ( String configFilename) �Q�读取��用Java的特性文件编写的配置文�g�?br>DOMConfigurator.configure ( String filename ) �Q�读取XML形式的配�|�文件�?br>
3.3.插入记录信息�Q�格式化日志信息�Q?br>当上两个必要步骤执行完毕�Q�您��可以轻村֜�使用不同优先�U�别的日志记录语句插入到您想记录日志的�Q何地方，其语法如下：
Logger.debug ( Object message ) ;
Logger.info ( Object message ) ;
Logger.warn ( Object message ) ;
Logger.error ( Object message ) ;

一个配�|�的例子:
log4j.rootLogger=INFO, stdout ,R
log4j.appender.stdout.Threshold=ERROR
log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=[QC] %p [%t] %C.%M(%L) | %m%n log4j.appender.R.Threshold=INFO
log4j.appender.R=org.apache.log4j.DailyRollingFileAppender
log4j.appender.R.File=c:/log.log
log4j.appender.R.layout=org.apache.log4j.PatternLayout log4j.appender.R.layout.ConversionPattern=%d-[TS] %p %t %c - %m%n

lixw 2007-04-25 17:34 发表评论

lixw — Thu, 08 Feb 2007 02:07:00 GMT

一�U�比较简陋的�Ҏ��Q?br />

1 ActionListener taskPerformer = new ActionListener() {
2             public void actionPerformed(ActionEvent evt) {
3                 log.info("monitor is running at " + new java.util.Date());
4                 String configfile = (String)getServletContext().getAttribute("configfile");
5                 if(configfile != null && configfile.length()!=0){
6                     try{
7                         File file = new File(configfile);
8                         if(file.lastModified() > lastModifyTime){
9                             lastModifyTime = file.lastModified();
10                             loadProp();
11                         }
12                     }catch(Exception e){
13                         log.error("construct file:" + configfile + " exception");
14                         e.printStackTrace();
15                     }
16                 }
17             }
18 };
19
20 //启动监听�U�程
21 new Timer(delay, taskPerformer).start();

来自geosoft.no的解��x��法：

1 import java.io.File;
2
3 /**
4  * Interface for listening to disk file changes.
5  * @see FileMonitor
6  *
7  * @author Jacob Dreyer
8  */
9 public interface FileListener
10 {
11   /**
12    * Called when one of the monitored files are created, deleted
13    * or modified.
14    *
15    * @param file  File which has been changed.
16    */
17   void fileChanged (File file);
18 }

  1 import java.util.*;
  2 import java.io.File;
  3 import java.lang.ref.WeakReference;
  4
  5 /**
  6  * Class for monitoring changes in disk files.
  7  * Usage:
  8  *
  9  *    1. Implement the FileListener interface.
10  *    2. Create a FileMonitor instance.
11  *    3. Add the file(s)/directory(ies) to listen for.
12  *
13  * fileChanged() will be called when a monitored file is created,
14  * deleted or its modified time changes.
15  *
16  * @author Jacob Dreyer
17  */
18 public class FileMonitor
19 {
20   private Timer       timer_;
21   private HashMap     files_;       // File -> Long
22   private Collection  listeners_;   // of WeakReference(FileListener)
23
24
25   /**
26    * Create a file monitor instance with specified polling interval.
27    *
28    * @param pollingInterval  Polling interval in milli seconds.
29    */
30   public FileMonitor (long pollingInterval)
31   {
32     files_     = new HashMap();
33     listeners_ = new ArrayList();
34
35     timer_ = new Timer (true);
36     timer_.schedule (new FileMonitorNotifier(), 0, pollingInterval);
37   }
38
39
40
41   /**
42    * Stop the file monitor polling.
43    */
44   public void stop()
45   {
46     timer_.cancel();
47   }
48
49
50   /**
51    * Add file to listen for. File may be any java.io.File (including a
52    * directory) and may well be a non-existing file in the case where the
53    * creating of the file is to be trepped.
54    *

55    * More than one file can be listened for. When the specified file is
56    * created, modified or deleted, listeners are notified.
57    *
58    * @param file  File to listen for.
59    */
60   public void addFile (File file)
61   {
62     if (!files_.containsKey (file)) {
63       long modifiedTime = file.exists() ? file.lastModified() : -1;
64       files_.put (file, new Long (modifiedTime));
65     }
66   }
67
68
69
70   /**
71    * Remove specified file for listening.
72    *
73    * @param file  File to remove.
74    */
75   public void removeFile (File file)
76   {
77     files_.remove (file);
78   }
79
80
81
82   /**
83    * Add listener to this file monitor.
84    *
85    * @param fileListener  Listener to add.
86    */
87   public void addListener (FileListener fileListener)
88   {
89     // Don't add if its already there
90     for (Iterator i = listeners_.iterator(); i.hasNext(); ) {
91       WeakReference reference = (WeakReference) i.next();
92       FileListener listener = (FileListener) reference.get();
93       if (listener == fileListener)
94         return;
95     }
96
97     // Use WeakReference to avoid memory leak if this becomes the
98     // sole reference to the object.
99     listeners_.add (new WeakReference (fileListener));
100   }
101
102
103
104   /**
105    * Remove listener from this file monitor.
106    *
107    * @param fileListener  Listener to remove.
108    */
109   public void removeListener (FileListener fileListener)
110   {
111     for (Iterator i = listeners_.iterator(); i.hasNext(); ) {
112       WeakReference reference = (WeakReference) i.next();
113       FileListener listener = (FileListener) reference.get();
114       if (listener == fileListener) {
115         i.remove();
116         break;
117       }
118     }
119   }
120
121
122
123   /**
124    * This is the timer thread which is executed every n milliseconds
125    * according to the setting of the file monitor. It investigates the
126    * file in question and notify listeners if changed.
127    */
128   private class FileMonitorNotifier extends TimerTask
129   {
130     public void run()
131     {
132       // Loop over the registered files and see which have changed.
133       // Use a copy of the list in case listener wants to alter the
134       // list within its fileChanged method.
135       Collection files = new ArrayList (files_.keySet());
136
137       for (Iterator i = files.iterator(); i.hasNext(); ) {
138         File file = (File) i.next();
139         long lastModifiedTime = ((Long) files_.get (file)).longValue();
140         long newModifiedTime  = file.exists() ? file.lastModified() : -1;
141
142         // Chek if file has changed
143         if (newModifiedTime != lastModifiedTime) {
144
145           // Register new modified time
146           files_.put (file, new Long (newModifiedTime));
147
148           // Notify listeners
149           for (Iterator j = listeners_.iterator(); j.hasNext(); ) {
150             WeakReference reference = (WeakReference) j.next();
151             FileListener listener = (FileListener) reference.get();
152
153             // Remove from list if the back-end object has been GC'd
154             if (listener == null)
155               j.remove();
156             else
157               listener.fileChanged (file);
158           }
159         }
160       }
161     }
162   }
163
164
165   /**
166    * Test this class.
167    *
168    * @param args  Not used.
169    */
170   public static void main (String args[])
171   {
172     // Create the monitor
173     FileMonitor monitor = new FileMonitor (1000);
174
175     // Add some files to listen for
176     monitor.addFile (new File ("D:\\myjava\\JCreatorWorkspace\\FileMonitor\\test.txt"));
177
178     // Add a dummy listener
179     monitor.addListener (monitor.new TestListener());
180
181     // Avoid program exit
182     while (!false) ;
183   }
184
185
186   private class TestListener
187     implements FileListener
188   {
189     public void fileChanged (File file)
190     {
191       System.out.println ("File [" + file.getName() + "] changed At:" + new java.util.Date());
192     }
193   }
194 }
195
196
197

lixw 2007-02-08 10:07 发表评论

�Ҏ��不同Locale��D��取不同的Properties配置文�g

lixw — Thu, 08 Feb 2007 01:43:00 GMT

1 //file may be named basename_locale.properties
2 ResourceBundle bundle = ResourceBundle.getBundle("basename");
3 // Enumerate contents of resource bundle
4 //The next two lines should be in one line.
5 for (Enumeration props = bundle.getKeys();props.hasMoreElements(); ) {
6 String key = (String)props.nextElement();
7 process(key, bundle.getObject(key));
8 }

lixw 2007-02-08 09:43 发表评论