External Command Call - More Java Than WebObjects
External Command Call - More Java Than WebObjects
- Subject: External Command Call - More Java Than WebObjects
- From: "Jonathan Fleming" <email@hidden>
- Date: Fri, 04 Jul 2003 01:06:49 +0100
I want to use java.lang.Runtime.exec() to run this command line code... any
ideas on how to best achieve that?
This is the command I want to run
C:\>convert -size 90x90
\Site000\web\WebObjects\My.woa\Contents\WebServerResources\fullSizeImages800pix\Conservatory.jpg
-resize 90x90 +profile "*"
\Site000\web\WebObjects\My.woa\Contents\WebServerResources\fullSizeImages800pix\ConservatoryThumb.jpg
The command is from ImageMagick's command line utilities.
In this code example, '-size 90x90' gives a hint to the JPEG decoder that
the image is going to be downscaled to 90x90, allowing it to run faster by
avoiding returning full-resolution images to ImageMagick for the subsequent
resizing operation. The '-resize 90x90' specifies the desired dimensions of
the output image. It will be scaled so its largest dimension is 90 pixels.
The '+profile "*"' removes any ICM, EXIF, IPTC, or other profiles that might
be present in the input and aren't needed in the thumbnail.
this is the route I am thinking of taking, but I don't fully understand what
inner classes are all about. Here's an example of how it is said I should be
using Runtime.exec().
// GoodWindowsExec.java
import java.util.*;
import java.io.*;
class StreamGobbler extends Thread
{
InputStream is;
String type;
StreamGobbler(InputStream is, String type)
{
this.is = is;
this.type = type;
}
public void run()
{
try
{
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
String line=null;
while ( (line = br.readLine()) != null)
System.out.println(type + ">" + line);
} catch (IOException ioe)
{
ioe.printStackTrace();
}
}
}
public class GoodWindowsExec
{
public static void main(String args[])
{
if (args.length < 1)
{
System.out.println("USAGE: java GoodWindowsExec <cmd>");
System.exit(1);
}
try
{
String osName = System.getProperty("os.name" );
String[] cmd = new String[3];
if( osName.equals( "Windows NT" ) )
{
cmd[0] = "cmd.exe" ;
cmd[1] = "/C" ;
cmd[2] = args[0];
}
else if( osName.equals( "Windows 95" ) )
{
cmd[0] = "command.com" ;
cmd[1] = "/C" ;
cmd[2] = args[0];
}
Runtime rt = Runtime.getRuntime();
System.out.println("Execing " + cmd[0] + " " + cmd[1]
+ " " + cmd[2]);
Process proc = rt.exec(cmd);
// any error message?
StreamGobbler errorGobbler = new
StreamGobbler(proc.getErrorStream(), "ERROR");
// any output?
StreamGobbler outputGobbler = new
StreamGobbler(proc.getInputStream(), "OUTPUT");
// kick them off
errorGobbler.start();
outputGobbler.start();
// any error???
int exitVal = proc.waitFor();
System.out.println("ExitValue: " + exitVal);
} catch (Throwable t)
{
t.printStackTrace();
}
}
}
this is taken from this article:
http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html
Can anyone help me to utilise this code and excecute the command I want for
the ImageMagick app to do it's thing?
Thanks
Jonathan :^)
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