BlogJava-黑灵客栈

调整更改ubuntu时区，时间

黑灵 — Tue, 01 Jul 2008 06:02:00 GMT

执行
tzselect
按照提示进行选择时区
sudo cp /usr/share/zoneinfo/Asia/ShangHai /etc/localtime
执行
sudo ntpdate cn.pool.ntp.org
cn.pool.ntp.org是位于中国的公共NTP服务器，用来同步你的时间

时间
sudo date -s 20080701

黑灵 2008-07-01 14:02 发表评论

如何在window系统中让py文件可以直接执行

黑灵 — Fri, 20 Jun 2008 09:25:00 GMT

摘要: 正常情况下你如果是用安装文件安装的Python, 那么安装时会给你设置好这样的功能. 但是有时候你可能不小心改了配置, 或者不是用安装包安装的. 这是如果你在控制台直接输入:
xxx.py arg1 arg2 这样的命令, 就不会显示"xxx.py"不是内部或外部命令，也不是可运行的程序或批处理文件。

比如你要用 django-admin.py startproject mysite 来建立项目. 阅读全文

黑灵 2008-06-20 17:25 发表评论

update-rc.d详解 Debian/Ubuntu系统启动脚本

黑灵 — Fri, 20 Jun 2008 08:04:00 GMT

update-rc.d详解 Debian系统启动脚本

Insert links using the defaults:
update-rc.d foobar defaults

Equivalent command using explicit argument sets:
update-rc.d foobar start 20 2 3 4 5 . stop 20 0 1 6 .

More typical command using explicit argument sets:
update-rc.d foobar start 30 2 3 4 5 . stop 70 0 1 6 .

Remove all links for a script (assuming foobar has been deleted
already):
update-rc.d foobar remove

Example of disabling a service:
update-rc.d -f foobar remove
update-rc.d foobar stop 20 2 3 4 5 .

Example of a command for installing a system initialization-and-shut‐
down script:
update-rc.d foobar start 45 S . start 31 0 6 .

Example of a command for disabling a system initialization-and-shutdown
script:
update-rc.d -f foobar remove
update-rc.d foobar stop 45 S .

黑灵 2008-06-20 16:04 发表评论

用Komodo调试Google App Engine应用程序

黑灵 — Thu, 12 Jun 2008 08:30:00 GMT

Google App Engine是个好东西(简称GAE), 具体是什么我就不说了, GAE的应用是用Python来开发的. 具体请看这里:
http://code.google.com/appengine/

Komodo是一个脚本语言IDE, 对Python支持的非常好, 现在个人版的也免费了. 用Komodo来调式Python程序也很方便. 但是GAE的运行方式和普通的python应用不太一样, 虽然原理是类似的, 但是不能直接在Komodo一点就运行调式.
关于Komodo:
http://www.activestate.com/Products/komodo_ide/index.mhtml

这里要说的是如何用Komodo以调试的方式运行GAE的应用.

首先, 把你的GAE应用在Komodo中建立一个Project:

然后在需要调式的代码里设置断点:

然后点击工具栏上的调式运行按钮:

会弹出对话框:

点击new按钮, 可以设定一个名字.

Script输入项, 要改为 D:\google\google_appengine\dev_appserver.py, 就是你的GAE安装目录下的dev_appserver.py文件. 其实如果你要在控制台上运行GAE也要运行这个文件, 不过是:
python dev_appserver.py 程序路径

Script Arguments 输入程序的路径, 如果应用程序的路径在GAE目录下, 则写相对路径, 如果不是则写绝对路径. 其他的参数可以根据http://code.google.com/appengine/docs/thedevwebserver.html#Command_Line_Arguments来确定.

Directory输入 GAE的路径

切换到Envirement页:

点击New..按钮, 创建一个PYTHONPATH变量

点击那个向下的箭头, 可以添加多个路径:

第一项是%PYTHONPATH%, 代表原始的PYTHONPATH变量.
后面有4项, 是GAE中的的Python库路径
这里我预先在系统环境中设置了系统变量GAE_HOME是GAE的安装路径,GAE_LIB=%GAE_HOME%\lib
这四项是:
%GAE_HOME%
%GAE_LIB%\yaml
%GAE_LIB%\django
%GAE_LIB%\webob
设置完毕后点击OK按钮, 然后点击Debug Options菜单的OK按钮, 就开始运行应用程序了

然后通过浏览器运行你的应用.

这样你就可以用Komodo开发调试你的GAE应用了, 很方便是吧!

黑灵 2008-06-12 16:30 发表评论

关于Chart的开源库

黑灵 — Tue, 10 Jun 2008 06:26:00 GMT

摘要: 收集的一些用于绘制图表的库. 阅读全文

黑灵 2008-06-10 14:26 发表评论

Tomcat配置

黑灵 — Fri, 09 May 2008 02:42:00 GMT

摘要: 转载： http://dev.csdn.net/author/DeepNightTwo/8d1c0efcb2064d6aab3397a019d9a0ff.html Tomcat 服务器server.xml的关键参数配置说明：以下文字均以tomcat5.0.30为例进行。1，配置tomcat服务器访问端口，只需配置Connector的port端口即... 阅读全文

黑灵 2008-05-09 10:42 发表评论

apche 虚拟目录（外部部署）（曾经犯的错误）

黑灵 — Fri, 09 May 2008 02:34:00 GMT

Alias 指令

说明	映射URL到文件系统的特定区域
语法	`Alias URL-pathfile-path\|directory-path`
作用域	server config, virtual host
状态	基本(B)
模块	mod_alias

Alias指令使文档可以被存储在DocumentRoot以外的本地文件系统中。以(%已解码的)url-path路径开头的URL可以被映射到以directory-path开头的本地文件。

示例：

Alias /image /ftp/pub/image

对"http://myserver/image/foo.gif"的请求，服务器将返回"/ftp/pub/image/foo.gif"文件。因为仅匹配完整路径，所以上述例子不会匹配对"http://myserver/imagefoo.gif"的请求。对于使用正则表达式的匹配，请参见AliasMatch指令。

注意：如果url-path中有后缀"/"，则服务器要求有后缀"/"以扩展此别名。也就是说"Alias /icons/ /usr/local/apache/icons/"并不能对"/icons"实现别名。

注意，可能需要额外指定一个段来覆盖别名的最终对象。由于只有出现在段之前的别名才会被检测，所以它只对最终对象生效。(由于执行别名操作之前段会被首先扫描一次，所以它们也是有效的)

特别地，如果对在DocumentRoot之外的某个目录建立了一个Alias ，则可能需要明确的对目标目录设定访问权限。

示例：

Alias /image /ftp/pub/image Order allow,deny Allow from all

1 < IfModule alias_module >
2     #
3     # Redirect: Allows you to tell clients about documents that used to
4     # exist in your server's namespace, but do not anymore. The client
5     # will make a new request for the document at its new location.
6     # Example:
7     # Redirect permanent /foo http://test.piao.net/bar
8
9     #
10     # Alias: Maps web paths into filesystem paths and is used to
11     # access content that does not live under the DocumentRoot.
12     # Example:
13     # Alias /webpath /full/filesystem/path
14     Alias /THINKPHP   D:/ThinkPHP
15     #
16     # If you include a trailing / on /webpath then the server will
17     # require it to be present in the URL.  You will also likely
18     # need to provide a < Directory > section to allow access to
19     # the filesystem path.
20
21     #
22     # ScriptAlias: This controls which directories contain server scripts.
23     # ScriptAliases are essentially the same as Aliases, except that
24     # documents in the target directory are treated as applications and
25     # run by the server when requested rather than as documents sent to the
26     # client.  The same rules about trailing "/" apply to ScriptAlias
27     # directives as to Alias.
28     #
29     ScriptAlias /cgi-bin/ "D:/Program Files/Apache2.2/cgi-bin/"
30
31 IfModule >

1 #
2 # "D:/Program Files/Apache2.2/cgi-bin" should be changed to whatever your ScriptAliased
3 # CGI directory exists, if you have that configured.
4 #
5 < Directory "D:/Program Files/Apache2.2/cgi-bin" >
6     AllowOverride None
7     Options None
8     Order allow,deny
9     Allow from all
10 Directory >
11
12 < Directory "D:/ThinkPHP" >
13     AllowOverride None
14     Options None
15     Order allow,deny
16     Allow from all
17 Directory >
18 #

黑灵 2008-05-09 10:34 发表评论

正则表达式

黑灵 — Fri, 14 Mar 2008 12:39:00 GMT

摘要: 揭开正则表达式的神秘面纱关闭高亮 [原创文章，转载请保留或注明出处：http://www.regexlab.com/zh/regref.htm] ... 阅读全文

黑灵 2008-03-14 20:39 发表评论

gbk_to_utf8

黑灵 — Tue, 11 Mar 2008 01:44:00 GMT

摘要: 前些时候需要把项目中的文本文件都从GBK编码转换为UTF-8编码. 如果要手动的一个个的改, 那可费事了. 反正想学学Groovy, 就用Groovy做的转换脚本吧. 阅读全文

黑灵 2008-03-11 09:44 发表评论

[待翻译]Categories of Java HotSpot VM Options

黑灵 — Wed, 26 Dec 2007 06:23:00 GMT

This document provides information on typical command-line options and environment variables that can affect the performance characteristics of the Java HotSpot Virtual Machine. Unless otherwise noted, all information in this document pertains to both the Java HotSpot Client VM and the Java HotSpot Server VM.

Users of JDKs older than 1.3.0 who wish to port to a Java HotSpot VM, should see Java HotSpot Equivalents of Exact VM flags.

Categories of Java HotSpot VM Options

Standard options recognized by the Java HotSpot VM are described on the Java Application Launcher reference pages for Windows, Solaris and Linux. This document deals exclusively with non-standard options recognized by the Java HotSpot VM:

Options that begin with -X are non-standard (not guaranteed to be supported on all VM implementations), and are subject to change without notice in subsequent releases of the JDK.
Options that are specified with -XX are not stable and are not recommended for casual use. These options are subject to change without notice.

Some Useful -XX Options

Default values are listed for Java SE 6 for Solaris Sparc with -server. Some options may vary per architecture/OS/JVM version. Platforms with a differing default value are listed in the description.

Boolean options are turned on with -XX:+ and turned off with -XX:-.
Numeric options are set with -XX:. Numbers can include 'm' or 'M' for megabytes, 'k' or 'K' for kilobytes, and 'g' or 'G' for gigabytes (for example, 32k is the same as 32768).
String options are set with -XX:, are usually used to specify a file, a path, or a list of commands

Flags marked as manageable are dynamically writeable through the JDK management interface (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. In Monitoring and Managing Java SE 6 Platform Applications, Figure 3 shows an example. The manageable flags can also be set through jinfo -flag.

The options below are loosely grouped into three categories.

Behavioral options change the basic behavior of the VM.
Performance tuning options are knobs which can be used to tune VM performance.
Debugging options generally enable tracing, printing, or output of VM information.

Behavioral Options

Option and Default Value	Description
-XX:-AllowUserSignalHandlers	Do not complain if the application installs signal handlers. (Relevant to Solaris and Linux only.)
-XX:AltStackSize=16384	Alternate signal stack size (in Kbytes). (Relevant to Solaris only, removed from 5.0.)
-XX:-DisableExplicitGC	Disable calls to System.gc(), JVM still performs garbage collection when necessary.
-XX:+FailOverToOldVerifier	Fail over to old verifier when the new type checker fails. (Introduced in 6.)
-XX:+HandlePromotionFailure	The youngest generation collection does not require a guarantee of full promotion of all live objects. (Introduced in 1.4.2 update 11) [5.0 and earlier: false.]
-XX:+MaxFDLimit	Bump the number of file descriptors to max. (Relevant to Solaris only.)
-XX:PreBlockSpin=10	Spin count variable for use with -XX:+UseSpinning. Controls the maximum spin iterations allowed before entering operating system thread synchronization code. (Introduced in 1.4.2.)
-XX:-RelaxAccessControlCheck	Relax the access control checks in the verifier. (Introduced in 6.)
-XX:+ScavengeBeforeFullGC	Do young generation GC prior to a full GC. (Introduced in 1.4.1.)
-XX:+UseAltSigs	Use alternate signals instead of SIGUSR1 and SIGUSR2 for VM internal signals. (Introduced in 1.3.1 update 9, 1.4.1. Relevant to Solaris only.)
-XX:+UseBoundThreads	Bind user level threads to kernel threads. (Relevant to Solaris only.)
-XX:-UseConcMarkSweepGC	Use concurrent mark-sweep collection for the old generation. (Introduced in 1.4.1)
-XX:+UseGCOverheadLimit	Use a policy that limits the proportion of the VM's time that is spent in GC before an OutOfMemory error is thrown. (Introduced in 6.)
-XX:+UseLWPSynchronization	Use LWP-based instead of thread based synchronization. (Introduced in 1.4.0. Relevant to Solaris only.)
-XX:-UseParallelGC	Use parallel garbage collection for scavenges. (Introduced in 1.4.1)
-XX:-UseParallelOldGC	Use parallel garbage collection for the full collections. Enabling this option automatically sets -XX:+UseParallelGC. (Introduced in 5.0 update 6.)
-XX:-UseSerialGC	Use serial garbage collection. (Introduced in 5.0.)
-XX:-UseSpinning	Enable naive spinning on Java monitor before entering operating system thread synchronizaton code. (Relevant to 1.4.2 and 5.0 only.) [1.4.2, multi-processor Windows platforms: true]
-XX:+UseTLAB	Use thread-local object allocation (Introduced in 1.4.0, known as UseTLE prior to that.) [1.4.2 and earlier, x86 or with -client: false]
-XX:+UseSplitVerifier	Use the new type checker with StackMapTable attributes. (Introduced in 5.0.)[5.0: false]
-XX:+UseThreadPriorities	Use native thread priorities.
-XX:+UseVMInterruptibleIO	Thread interrupt before or with EINTR for I/O operations results in OS_INTRPT. (Introduced in 6. Relevant to Solaris only.)

Back to Options

Performance Options

Option and Default Value	Description
-XX:+AggressiveOpts	Turn on point performance compiler optimizations that are expected to be default in upcoming releases. (Introduced in 5.0 update 6.)
-XX:CompileThreshold=10000	Number of method invocations/branches before compiling [-client: 1,500]
-XX:LargePageSizeInBytes=4m	Sets the large page size used for the Java heap. (Introduced in 1.4.0 update 1.) [amd64: 2m.]
-XX:MaxHeapFreeRatio=70	Maximum percentage of heap free after GC to avoid shrinking.
-XX:MaxNewSize=size	Maximum size of new generation (in bytes). Since 1.4, MaxNewSize is computed as a function of NewRatio. [1.3.1 Sparc: 32m; 1.3.1 x86: 2.5m.]
-XX:MaxPermSize=64m	Size of the Permanent Generation. [5.0 and newer: 64 bit VMs are scaled 30% larger; 1.4 amd64: 96m; 1.3.1 -client: 32m.]
-XX:MinHeapFreeRatio=40	Minimum percentage of heap free after GC to avoid expansion.
-XX:NewRatio=2	Ratio of new/old generation sizes. [Sparc -client: 8; x86 -server: 8; x86 -client: 12.]-client: 4 (1.3) 8 (1.3.1+), x86: 12]
-XX:NewSize=2.125m	Default size of new generation (in bytes) [5.0 and newer: 64 bit VMs are scaled 30% larger; x86: 1m; x86, 5.0 and older: 640k]
-XX:ReservedCodeCacheSize=32m	Reserved code cache size (in bytes) - maximum code cache size. [Solaris 64-bit, amd64, and -server x86: 48m; in 1.5.0_06 and earlier, Solaris 64-bit and and64: 1024m.]
-XX:SurvivorRatio=8	Ratio of eden/survivor space size [Solaris amd64: 6; Sparc in 1.3.1: 25; other Solaris platforms in 5.0 and earlier: 32]
-XX:TargetSurvivorRatio=50	Desired percentage of survivor space used after scavenge.
-XX:ThreadStackSize=512	Thread Stack Size (in Kbytes). (0 means use default stack size) [Sparc: 512; Solaris x86: 320 (was 256 prior in 5.0 and earlier); Sparc 64 bit: 1024; Linux amd64: 1024 (was 0 in 5.0 and earlier); all others 0.]
-XX:+UseBiasedLocking	Enable biased locking. For more details, see this tuning example. (Introduced in 5.0 update 6.) [5.0: false]
-XX:+UseFastAccessorMethods	Use optimized versions of GetField.
-XX:-UseISM	Use Intimate Shared Memory. [Not accepted for non-Solaris platforms.] For details, see Intimate Shared Memory.
-XX:+UseLargePages	Use large page memory. (Introduced in 5.0 update 5.) For details, see Java Support for Large Memory Pages.
-XX:+UseMPSS	Use Multiple Page Size Support w/4mb pages for the heap. Do not use with ISM as this replaces the need for ISM. (Introduced in 1.4.0 update 1, Relevant to Solaris 9 and newer.) [1.4.1 and earlier: false]