想把xp登录时要输入用户名密码的对话框给取消了，直接进入windows系统。可以用rundll32 netplwiz.dll,UsersRunDll命令来修改帐号管理，取消用户必须使用用户名密码才能登录的选项即可。

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/**
 * 按字节长度截取字符串
 * 
 * @param str
 *            将要截取的字符串参数
 * @param toCount
 *            截取的字节长度
 * @param more
 *            字符串末尾补上的字符串
 * @return 返回截取后的字符串
 */
public String substring(String str, int toCount, String more) {
		int reInt = 0;
		String reStr = "";
		if (str == null)
			return "";
		char[] tempChar = str.toCharArray();
		for (int kk = 0; (kk < tempChar.length && toCount > reInt); kk++) {
			String s1 = String.valueOf(tempChar[kk]);
			byte[] b = s1.getBytes();
			reInt += b.length;
			reStr += tempChar[kk];
		}
		if (toCount == reInt || (toCount == reInt - 1))
			reStr += more;
		return reStr;
	}

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原文http://blog.csdn.net/fyzhao/archive/2007/01/18/1486592.aspx
     Cantor三分集的构造如下图所示，一条线段ab被均分为三段，保留其两边的两段，中间一段去掉，然后把得到的每一段再继续进行划分，如此反复。
    

      Cantor 三分集的绘制十分简单，是一种最简单的分形实例，它的算法如下：

cx = ax + ( bx – ax ) / 3

cy = ay + h

dx = bx – ( bx – ax ) / 3

dy = by + h

ay = ay – h

by = by – h

其中 h 为两层之间的距离。

        Cantor 三分集的 python 程序实现及其运行结果如下：

from Tkinter import *

class Cantor(Frame):
    
    limit = 1

    def __init__(self, master=None):
        Frame.__init__(self, master)
        self.grid()
        self.createWidgets()

    def createWidgets(self):
        self.draw = Canvas(self, width=800, height=500)
        self.draw.pack(side=LEFT)
        self.drawCanvas(100,100,700,100)

    def drawCanvas(self,ax,ay,bx,by):
        self.draw.create_line(ax,ay,bx,by)
        if ((bx-ax)>self.limit):
            cx = ax + (bx - ax) / 3;
            cy = ay + 50;
            dx = bx - (bx - ax) / 3;
            dy = by + 50;
            ay = ay + 50;
            by = by + 50;
            self.drawCanvas(ax,ay,cx,cy)
            self.drawCanvas(dx,dy,bx,by)
            



app = Cantor()
app.master.title("Cantor (recursive)")
app.mainloop()

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javascript:R=0; x1=.1; y1=.05; x2=.25; y2=.24; x3=1.6; y3=.24; x4=300; y4=200; x5=300; y5=200; DI=document.images; DIL=DI.length; function A(){for(i=0; i-DIL; i++){DIS=DI[ i ].style; DIS.position='absolute'; DIS.left=Math.sin(R*x1+i*x2+x3)*x4+x5; DIS.top=Math.cos(R*y1+i*y2+y3)*y4+y5}R++}setInterval('A()',5); void(0);
  

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com.ibm.ws.exception.WsException: DSRA0080E: An exception was received by the Data Store Adapter. See original exception message: [IBM][CLI Driver] SQL30082N  尝试建立连接失败，安全性原因为 "24"（"USERNAME AND/OR PASSWORD INVALID"）。  SQLSTATE=08001
. with SQL State : 08001 SQL Code : -30082
	at com.ibm.ws.rsadapter.exceptions.DataStoreAdapterException.setLinkedException(DataStoreAdapterException.java:417)
	at com.ibm.ws.rsadapter.spi.InternalGenericDataStoreHelper.mapException(InternalGenericDataStoreHelper.java:379)
	at com.ibm.ws.rsadapter.spi.WSRdbDataSource.translateSQLException(WSRdbDataSource.java:1023)
	at com.ibm.ws.rsadapter.spi.WSRdbDataSource.getConnection(WSRdbDataSource.java:826)
	at com.ibm.ws.rsadapter.spi.WSManagedConnectionFactoryImpl.createManagedConnection(WSManagedConnectionFactoryImpl.java:742)
	at com.ibm.ejs.j2c.poolmanager.FreePool.createManagedConnectionWithMCWrapper(FreePool.java:1331)
	at com.ibm.ejs.j2c.poolmanager.FreePool.createOrWaitForConnection(FreePool.java:1132)
	at com.ibm.ejs.j2c.poolmanager.PoolManager.reserve(PoolManager.java(Compiled Code))
	at com.ibm.ejs.j2c.ConnectionManager.allocateMCWrapper(ConnectionManager.java(Compiled Code))
	at com.ibm.ejs.j2c.ConnectionManager.allocateConnection(ConnectionManager.java(Compiled Code))
	at com.ibm.ws.rsadapter.jdbc.WSJdbcDataSource.getConnection(WSJdbcDataSource.java(Compiled Code))
	at com.ibm.ws.rsadapter.jdbc.WSJdbcDataSource.getConnection(WSJdbcDataSource.java(Compiled Code))
	at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java(Compiled Code))
	at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java(Compiled Code))
	at test.DebugFilter.doFilter(DebugFilter.java(Compiled Code))
	at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java(Compiled Code))
	at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java(Compiled Code))
	at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.handleWebAppDispatch(WebAppRequestDispatcher.java(Compiled Code))
	at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.dispatch(WebAppRequestDispatcher.java(Compiled Code))
	at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java(Compiled Code))
	at com.ibm.ws.webcontainer.srt.WebAppInvoker.doForward(WebAppInvoker.java(Compiled Code))
	at com.ibm.ws.webcontainer.srt.WebAppInvoker.handleInvocationHook(WebAppInvoker.java(Compiled Code))
	at com.ibm.ws.webcontainer.cache.invocation.CachedInvocation.handleInvocation(CachedInvocation.java(Compiled Code))
	at com.ibm.ws.webcontainer.cache.invocation.CacheableInvocationContext.invoke(CacheableInvocationContext.java:116)
	at com.ibm.ws.webcontainer.srp.ServletRequestProcessor.dispatchByURI(ServletRequestProcessor.java(Compiled Code))
	at com.ibm.ws.webcontainer.oselistener.OSEListenerDispatcher.service(OSEListener.java(Compiled Code))
	at com.ibm.ws.webcontainer.http.HttpConnection.handleRequest(HttpConnection.java(Compiled Code))
	at com.ibm.ws.http.HttpConnection.readAndHandleRequest(HttpConnection.java(Compiled Code))
	at com.ibm.ws.http.HttpConnection.run(HttpConnection.java:448)
	at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java(Compiled Code))
Caused by: com.ibm.websphere.ce.cm.StaleConnectionException: [IBM][CLI Driver] SQL30082N  尝试建立连接失败，安全性原因为 "24"（"USERNAME AND/OR PASSWORD INVALID"）。  SQLSTATE=08001
DSRA0010E: SQL 状态 = 08001，错误代码 = -30,082
	at sun.reflect.GeneratedConstructorAccessor108.newInstance(Unknown Source)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java(Compiled Code))
	at java.lang.reflect.Constructor.newInstance(Constructor.java(Compiled Code))
	at com.ibm.websphere.rsadapter.GenericDataStoreHelper.mapExceptionHelper(GenericDataStoreHelper.java:481)
	at com.ibm.websphere.rsadapter.GenericDataStoreHelper.mapException(GenericDataStoreHelper.java:524)
	at com.ibm.ws.rsadapter.spi.InternalGenericDataStoreHelper.mapException(InternalGenericDataStoreHelper.java:366)
	... 36 more
---- Begin backtrace for nested exception
com.ibm.websphere.ce.cm.StaleConnectionException: [IBM][CLI Driver] SQL30082N  尝试建立连接失败，安全性原因为 "24"（"USERNAME AND/OR PASSWORD INVALID"）。  SQLSTATE=08001
DSRA0010E: SQL 状态 = 08001，错误代码 = -30,082
	at sun.reflect.GeneratedConstructorAccessor108.newInstance(Unknown Source)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java(Compiled Code))
	at java.lang.reflect.Constructor.newInstance(Constructor.java(Compiled Code))
	at com.ibm.websphere.rsadapter.GenericDataStoreHelper.mapExceptionHelper(GenericDataStoreHelper.java:481)
	at com.ibm.websphere.rsadapter.GenericDataStoreHelper.mapException(GenericDataStoreHelper.java:524)
	at com.ibm.ws.rsadapter.spi.InternalGenericDataStoreHelper.mapException(InternalGenericDataStoreHelper.java:366)
	at com.ibm.ws.rsadapter.spi.WSRdbDataSource.translateSQLException(WSRdbDataSource.java:1023)
	at com.ibm.ws.rsadapter.spi.WSRdbDataSource.getConnection(WSRdbDataSource.java:826)
	at com.ibm.ws.rsadapter.spi.WSManagedConnectionFactoryImpl.createManagedConnection(WSManagedConnectionFactoryImpl.java:742)
	at com.ibm.ejs.j2c.poolmanager.FreePool.createManagedConnectionWithMCWrapper(FreePool.java:1331)
	at com.ibm.ejs.j2c.poolmanager.FreePool.createOrWaitForConnection(FreePool.java:1132)
	at com.ibm.ejs.j2c.poolmanager.PoolManager.reserve(PoolManager.java(Compiled Code))
	at com.ibm.ejs.j2c.ConnectionManager.allocateMCWrapper(ConnectionManager.java(Compiled Code))
	at com.ibm.ejs.j2c.ConnectionManager.allocateConnection(ConnectionManager.java(Compiled Code))
	at com.ibm.ws.rsadapter.jdbc.WSJdbcDataSource.getConnection(WSJdbcDataSource.java(Compiled Code))
	at com.ibm.ws.rsadapter.jdbc.WSJdbcDataSource.getConnection(WSJdbcDataSource.java(Compiled Code))
	at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java(Compiled Code))
	at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java(Compiled Code))
	at test.DebugFilter.doFilter(DebugFilter.java(Compiled Code))
	at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java(Compiled Code))
	at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java(Compiled Code))
	at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.handleWebAppDispatch(WebAppRequestDispatcher.java(Compiled Code))
	at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.dispatch(WebAppRequestDispatcher.java(Compiled Code))
	at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java(Compiled Code))
	at com.ibm.ws.webcontainer.srt.WebAppInvoker.doForward(WebAppInvoker.java(Compiled Code))
	at com.ibm.ws.webcontainer.srt.WebAppInvoker.handleInvocationHook(WebAppInvoker.java(Compiled Code))
	at com.ibm.ws.webcontainer.cache.invocation.CachedInvocation.handleInvocation(CachedInvocation.java(Compiled Code))
	at com.ibm.ws.webcontainer.cache.invocation.CacheableInvocationContext.invoke(CacheableInvocationContext.java:116)
	at com.ibm.ws.webcontainer.srp.ServletRequestProcessor.dispatchByURI(ServletRequestProcessor.java(Compiled Code))
	at com.ibm.ws.webcontainer.oselistener.OSEListenerDispatcher.service(OSEListener.java(Compiled Code))
	at com.ibm.ws.webcontainer.http.HttpConnection.handleRequest(HttpConnection.java(Compiled Code))
	at com.ibm.ws.http.HttpConnection.readAndHandleRequest(HttpConnection.java(Compiled Code))
	at com.ibm.ws.http.HttpConnection.run(HttpConnection.java:448)
	at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java(Compiled Code))

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<HTML>
<HEAD>
<title>test</title>
</HEAD>
<body onbeforeunload="RunOnBeforeUnload()" onunload="RunOnUnload()">
<script language="javascript">
function RunOnBeforeUnload() {
 window.event.returnValue = '关闭浏览器将退出系统.';
 //alert("before");
 }
function RunOnUnload() {
 //执行你的代码
 alert("good");
}
</script>
</body>
</HTML>

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bigner forker # emerge --info
Portage 2.1.3.12 (default-linux/x86/2007.0, gcc-4.1.1, glibc-2.6.1-r0, 2.6.22-gentoo-r8 i686)
=================================================================
System uname: 2.6.22-gentoo-r8 i686 Intel(R) Celeron(R) CPU 2.50GHz
Timestamp of tree: Tue, 09 Oct 2007 16:20:01 +0000
ccache version 2.4 [disabled]
app-shells/bash:     3.2_p17-r1
dev-lang/python:     2.4.3-r4, 2.5.1-r2
dev-python/pycrypto: 2.0.1-r6
dev-util/ccache:     2.4-r7
sys-apps/baselayout: 1.12.10-r5
sys-apps/sandbox:    1.2.18.1
sys-devel/autoconf:  2.13, 2.61-r1
sys-devel/automake:  1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.6-r2, 1.10
sys-devel/binutils:  2.18-r1
sys-devel/gcc-config: 1.4.0-r3
sys-devel/libtool:   1.5.24
virtual/os-headers:  2.6.22-r2
ACCEPT_KEYWORDS="x86 ~x86"
CBUILD="i686-pc-linux-gnu"
CFLAGS="-march=i686 -O2 -pipe"
CHOST="i686-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/kde/3.5/env /usr/kde/3.5/share/config /usr/kde/3.5/shutdown /usr/share/config"
CONFIG_PROTECT_MASK="/etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/terminfo /etc/udev/rules.d"
CXXFLAGS="-march=i686 -O2 -pipe"
DISTDIR="/usr/portage/distfiles"
FEATURES="distlocks metadata-transfer sandbox sfperms strict unmerge-orphans userfetch"
GENTOO_MIRRORS="ftp://gentoo.arcticnetwork.ca/pub/gentoo/ http://gentoo.arcticnetwork.ca/ "
LANG="en_US.UTF-8"
LINGUAS="zh_CN"
MAKEOPTS="-j2"
PKGDIR="/usr/portage/packages"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress --force --whole-file --delete --delete-after --stats --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages --filter=H_**/files/digest-*"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
PORTDIR_OVERLAY="/usr/portage/local/layman/gentoo-china"
SYNC="rsync://rsync.asia.gentoo.org/gentoo-portage"
USE="X acl alsa berkdb bitmap-fonts cli cracklib crypt cups dbus dri gdbm gpm hal iconv immqt isdnlog kdebase midi mudflap ncurses nls nptl nptlonly opengl openmp pam pcre perl pppd python qt3 qt4 readline reflection session spl ssl svg tcpd truetype truetype-fonts type1-fonts unicode x86 xorg" ALSA_CARDS="AC97" ALSA_PCM_PLUGINS="adpcm alaw asym copy dmix dshare dsnoop empty extplug file hooks iec958 ioplug ladspa lfloat linear meter mulaw multi null plug rate route share shm softvol" ELIBC="glibc" INPUT_DEVICES="keyboard mouse" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LINGUAS="zh_CN" USERLAND="GNU" VIDEO_CARDS="apm ark chips cirrus cyrix dummy fbdev glint i128 i740 i810 imstt mach64 mga neomagic nsc nv r128 radeon rendition s3 s3virge savage siliconmotion sis sisusb tdfx tga trident tseng v4l vesa vga via vmware voodoo"
Unset:  CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LC_ALL, LDFLAGS, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS

bigner forker # gcc-config -l
 [1] i686-pc-linux-gnu-3.3.6
 [2] i686-pc-linux-gnu-4.1.1 *
 [3] i686-pc-linux-gnu-4.2.1
bigner forker # gcc-config 3
 * Switching native-compiler to i686-pc-linux-gnu-4.2.1 ...               [ ok ]
bigner forker # env-update
>>> Regenerating /etc/ld.so.cache...
bigner forker # source /etc/profile
bigner forker # gcc-config -l
 [1] i686-pc-linux-gnu-3.3.6
 [2] i686-pc-linux-gnu-4.1.1 *
 [3] i686-pc-linux-gnu-4.2.1

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1. 从 Apache.org 下载最新版 jakarta-taglibs-standard-current.tar.gz
   
2. 解压缩下载的文件。
3. 将 jakarta-taglibs-standard-1.1.2/tld/c.tld 拷贝到 WEB/INF/tlds 目录
   
4. 将 jakarta-taglibs-standard-1.1.2/lib 中的所有JAR文件拷贝到 WEB-INF/lib 目录(jstl.jar和standard.jar)
   
5. 将以下显示的条目添加到 WEB-INF/web.xml 部署描述符中
   

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oracle sql日期比较:
在今天之前:
select * from up_date where update < to_date('2007-09-07 00:00:00','yyyy-mm-dd hh24:mi:ss')
select * from up_date where update <= to_date('2007-09-07 00:00:00','yyyy-mm-dd hh24:mi:ss')

在今天只后:
select * from up_date where update > to_date('2007-09-07 00:00:00','yyyy-mm-dd hh24:mi:ss')
select * from up_date where update >= to_date('2007-09-07 00:00:00','yyyy-mm-dd hh24:mi:ss')

精确时间:
select * from up_date where update = to_date('2007-09-07 00:00:00','yyyy-mm-dd hh24:mi:ss')

在某段时间内:
select * from up_date where update between to_date('2007-07-07 00:00:00','yyyy-mm-dd hh24:mi:ss') and to_date('2007-09-07 00:00:00','yyyy-mm-dd hh24:mi:ss')
select * from up_date where update < to_date('2007-09-07 00:00:00','yyyy-mm-dd hh24:mi:ss') and update > to_date('2007-07-07 00:00:00','yyyy-mm-dd hh24:mi:ss')
select * from up_date where update <= to_date('2007-09-07 00:00:00','yyyy-mm-dd hh24:mi:ss') and update >= to_date('2007-07-07 00:00:00','yyyy-mm-dd hh24:mi:ss')

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   那么还原可以mysql命令，mysql -u 用户名 -p (密码) -h 主机名 --one-database 还原数据库名 < 路径/备份名.bak,--one-database是指定要恢复的数据库.

  (括号表示密码不先输入，在连接时在Enter password;若密码为空可缺省-p参数)

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