Time Breakdown of Modern Web Design

Time Breakdown of Modern Web Design

 

[Ubuntu] Fix GRUB crash at startup [ERROR 15]

• Run Ubuntu Live CD
• Enter a terminal
• Locate the linux boot partition lives
  [user@net ~]$sudo fdisk -l
• Assume the boot partition lives in /dev/sda6 then do mount into a directory, example /mnt/root
• [user@net ~]$sudo mkdir /mnt/root
• [user@net ~]$sudo mount -t ext3 /dev/sda6 /mnt/root
• [user@net ~]$sudo grub-install –root-directory=/mnt/root /dev/sda –recheck
• reboot

[Source]

 

Configuring Tomcat and Apache using mod_jk

1. The system used in this tutorial has the following installed : Tomcat 6.0.14, Apache 2.2.8
2. See on <tomcat_home>/conf/server.xml
   <Connector port="8009" protocol="AJP/1.3" redirectPort="8443" />
3. Download mod_jk from here
4. Install mod_jk in Apache module directory
   • On Linux, usual location : 
     • /usr/lib/apache/
     • /usr/lib/apache2/
     • /usr/local/apache/libexec/
   • On Windows, usual location :
     • C:\Program Files\Apache Group\Apache\modules\
     • C:\Program Files\Apache Group\Apache2\modules\

 

[Ubuntu] Playing Restricted Formats

Ubuntu can play the most popular non-free media formats, including DVD, MP3, Quicktime, Windows Media, and more by following the instructions below:

For Ubuntu 8.04/7.10, open the terminal, and execute the following command:
#sudo apt-get install ubuntu-restricted-extras

Another way is using Synaptic:

• Go to Applications → Add/Remove…
• Set Show: to All available applications
• Search for ubuntu-restricted-extras and install it. Note that there is also xubuntu-restricted-extras (for Xubuntu) and kubuntu-restricted-extras (for Kubuntu.)

[Source]

 

[Ubuntu] Enabling Apache user home public_html directory

In order to enable the user-specific public_html directory open up a terminal and switch to the apache module config directory:

cd /etc/apache2/mods-enabled

If you list all the files inside this directory you’ll notice that all of them are actually symbolic links. To enable mod_userdir, which is the module you’re interested in, you’ll have to create two symlinks to the relevant files:

sudo ln -s ../mods-available/userdir.load

sudo ln -s ../mods-available/userdir.conf

All done! Now restart Apache via:

sudo apache2ctl restart

We can now access the web applications stored in our /home/username/public_html directory via http://localhost/~username/

 

Install Java COMM RXTX in Linux

Instruction dated May 2005

1. First install java SDK as shown above. Let say your java is in /usr/lib/j2sdk1.4-sun. It depends on your version, and where you install it. I will call it $JAVA
2. Get the latext binary for linux from rxtx.org.
   untar it, you will see lib-something-parallel.so and lib-something-serial.so.
   cp those to $JAVA/jre/lib/i386/
   you will also see RXTXcomm.jar
   cp that to $JAVA/jre/lib/ext
3. Get Java Comm from sun (http://java.sun.com/products/javacomm/downloads/index.html)
   Download Version 2.0 for Microsoft Windows and Solaris/x86
   Get the Solaris x86 version
   you will see comm.jar
   cp that to $JAVA/jre/lib/ext
4. echo “Driver=gnu.io.RXTXCommDriver” > $JAVA/jre/lib/javax.comm.properties
5. Test out your installation
   Go to the untar javacomm directory
   inside it, there should be a samples/Simple
   javac *.java
   See if there is error. If there is no error, installation is finished!

[Source]

 

[J2ME] Create an Image Object

Input : String imgName (Image name)
Output : Image Object

This Procedure can do two things :

1. Creating Image object from image file on file system
2. Creating Image object from image file on http server

 

[J2ME] Resize an Image Object

public static Image resizeImage(Image src, int screenWidth, int screenHeight)
{
    int srcWidth = src.getWidth();
    int srcHeight = src.getHeight();
    Image tmp = Image.createImage(screenWidth, srcHeight);
    Graphics g = tmp.getGraphics();
    int ratio = (srcWidth << 16) / screenWidth;
    int pos = ratio / 2;

    // Horizontal Resize
    for (int x = 0; x < screenWidth; x++)
    {
        g.setClip(x, 0, 1, srcHeight);
        g.drawImage(src, x - (pos >> 16), 0, Graphics.LEFT | Graphics.TOP);
        pos += ratio;
    }

    Image resizedImage = Image.createImage(screenWidth, screenHeight);
    g = resizedImage.getGraphics();
    ratio = (srcHeight << 16) / screenHeight;
    pos = ratio / 2;

    //Vertical resize
    for (int y = 0; y < screenHeight; y++) {
        g.setClip(0, y, screenWidth, 1);
        g.drawImage(tmp, 0, y - (pos >> 16), Graphics.LEFT | Graphics.TOP);
        pos += ratio;
    }

    return resizedImage;
}

 

Setting CVS Server

• Add a user ‘cvs‘ and a group ‘cvs‘
  #useradd -M -s /sbin/nologin cvs
#useradd -M -s /sbin/nologin anonymous
• Edit /etc/group to add another user to cvs group
  #vi /etc/group
cvs:x:502:user1,user2,anonymous
• Check whether the following 2 lines has been added on file /etc/services
  cvspserver 2401/tcp
cvspserver 2401/udp
  If can’t find, you have to add the lines.

 

Google Chart API

The Google Chart API lets you dynamically generate charts. To see the Chart API in action, open up a browser window and copy the following URL into it:

http://chart.apis.google.com/chart?cht=p3&chd=s:hW&
chs=250x100&chl=Hello|World

Press the Enter or Return key and – presto! – you should see the following image: