Der Blog von Benny Neugebauer

Div Element horizontal und vertikal zentrieren

bennyn — Fri, 27 Jan 2012 12:16:14 +0000

Ein Code sagt mehr als tausend Worte:

DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>Centering a Div horizontally and verticallytitle>
    <style type="text/css">
      html
      {
        background-color: black;
      }
 
      body
      {
        width: 100%;
        height: 100%;
        position: static; /* don't make it relative! */
      }
 
      #centered
      {
        position: absolute;
        height: 396px;
        width: 400px;
        margin: -198px 0px 0px -200px; /* 50% height, 0px, 0px, 50% width */
        top: 50%;
        left: 50%;
        background-color: violet;
        border: 1px solid white;
      }
    style>
  head>
  <body>  
    <div id="centered">div>
  body>
html>

JavaScript AMD Example with RequireJS

bennyn — Wed, 25 Jan 2012 14:09:18 +0000

One line of code is worth ten thousand words.

./index.html



  
    
    Asynchronous Module Definition Example with RequireJS

./js/my_amd_module.js

define('js/my_amd_module', // module name, has to match filename (without .js)
  ['js/jquery-1.7.min'], // requirements of this module (./js/jquery-1.7.min.js)
  function($) // $ for jQuery
  {
    return {
      sayHello: function()
      {
        alert('Hello World!');
      },
      doSomething: function()
      {
        alert('I did.');
      }
    };
  });

Mit Java in eine Textdatei schreiben

bennyn — Fri, 13 Jan 2012 21:53:39 +0000

Mit dem folgendem Code kann ein beliebiger Inhalt in eine Textdatei geschrieben werden. Sollte die Datei bereits existieren, wird der Text am Ende der Datei angefügt:

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
 
public class SimpleFileWriter
{
 
  static final Logger logger = Logger.getLogger(SimpleFileWriter.class.getName());
 
  public static void writeFile(String pathName, String content) throws IOException
  {
    File file = new File(pathName);
    try (FileWriter writer = new FileWriter(file, true))
    {
      writer.write(content);
      writer.flush();
    }
  }
 
  public static void main(String[] args)
  {
    try
    {
      writeFile("C:/Temp/test.txt", "Hello World!" + System.getProperty("line.separator", "\r\n"));
      System.out.println("Data was successfully written.");
    }
    catch (IOException ex)
    {
      logger.log(Level.WARNING, ex.getLocalizedMessage());
    }
  }
}

How to install Java 7 on Debian

bennyn — Fri, 13 Jan 2012 21:13:23 +0000

Here is a tutorial on how to install the latest Java 7 JDK and JRE on a Debian Linux system:

apt-get update && apt-get upgrade -y
sudo apt-get install sun-java6-jdk -y
mkdir /tmp/downloads && cd /tmp/downloads 
wget http://download.oracle.com/otn-pub/java/jdk/7u2-b13/jdk-7u2-linux-i586.tar.gz
tar -xvf jdk-7u2-linux-i586.tar.gz
mv /tmp/downloads/jdk1.7.0_02 /usr/lib/jvm
mv /usr/lib/jvm/jdk1.7.0_02 /usr/lib/jvm/java-7-oracle
sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/java-7-oracle/bin/java" 1
sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/jvm/java-7-oracle/bin/javac" 1
sudo update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/lib/jvm/java-7-oracle/bin/javaws" 1
sudo update-alternatives --config java
java -version
rm -r /tmp/downloads

Print Windows cmd output with Java

bennyn — Fri, 13 Jan 2012 20:17:11 +0000

For some Java applications it might be important to access the console to print some information from a console command. That’s why I wrote a little program which reads the output from the Windows command-line interface (cmd) and shows it on the screen. Note: This script also works on a Linux shell!

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.logging.Level;
import java.util.logging.Logger;
 
public class ConsoleOutputPrinter
{
 
  static final Logger logger = Logger.getLogger(ConsoleOutputPrinter.class.getName());
 
  public static String getOutputFromConsoleCommand(String command) throws UnsupportedEncodingException, IOException
  {
    Process console = Runtime.getRuntime().exec(command);
    String consoleEncoding = "UTF-8";
    if (System.getProperty("os.name").contains("Windows"))
      consoleEncoding = "CP850";
 
    InputStream is = console.getInputStream(); // use .getErrorStream() for error messages!
    BufferedReader br = new BufferedReader(new InputStreamReader(is, consoleEncoding));
    StringBuilder sb = new StringBuilder();
    String line = null;
    while ((line = br.readLine()) != null)
    {
      sb.append(line).append(System.getProperty("line.separator"));
    }
 
    return sb.toString();
  }
 
  public static void main(String[] args)
  {
    try
    {
      String consoleOutput = getOutputFromConsoleCommand("ping localhost");
      System.out.println(consoleOutput);
    }
    catch (IOException ex)
    {
      logger.log(Level.WARNING, ex.getLocalizedMessage());
    }
  }
}