Am 14.02.2006 16:20 Uhr schrieb "Kieran Kelleher" unter
<[EMAIL PROTECTED]>:
> Can someone recommend the quickest (free) java api to implement a few
> lines of code to just scale down an uploaded image to low
> resolution/smaller-size. Users upload JPG artwork (about 4MB) for
> postcard designs and I want to display a low-res scaled down version on
> the page after upload to show what they have uploaded. I need something
> quick and dirty and I know that ImageMagick has been talked about a
> lot, but I want something simple in Java that I can use in WebObjects
> and deploy to XServe (Panther).
Thats what i do (it's not simply java but...):
class Thumber extends Thread
{
private String source;
private String target;
public Thumber ( String aSource, String aTarget )
{
source = aSource;
target = aTarget;
}
public void run()
{
try
{
String command = "sips -Z 400 -s format jpeg -s
formatOptions low " + source + " --out " + target;
if ( NSLog.debugLoggingAllowedForLevel (
NSLog.DebugLevelDetailed ) )
{
NSLog.out.appendln ( "Thumbing command : " + command );
}
Process p = Runtime.getRuntime ().exec ( command );
if ( NSLog.debugLoggingAllowedForLevel (
NSLog.DebugLevelDetailed ) )
{
NSLog.out.appendln ( "Thumbing process waiting " );
}
new StreamGobbler ( p.getInputStream(), "Thumb-process
INPUT" ).start();
new StreamGobbler ( p.getErrorStream(), "Thumb-process
ERROR" ).start();
int terminated = p.waitFor ();
if ( NSLog.debugLoggingAllowedForLevel (
NSLog.DebugLevelDetailed ) )
{
NSLog.out.appendln ( "Thumbing result: terminated (0=OK)
: " + terminated );
BufferedReader in = new BufferedReader( new
InputStreamReader ( p.getErrorStream () ) );
NSLog.out.appendln ( "Thumbing error : " + in.readLine
() );
}
}
catch ( Exception e )
{
if ( NSLog.debugLoggingAllowedForLevel (
NSLog.DebugLevelDetailed ) )
{
// quiet error
NSLog.err.appendln ( "Error creating thumb file : " + e
);
e.printStackTrace();
}
}
}
}
--------
"sips" is included in mac os x. As a result i have the uploaded file and for
display purpose i use the thumbed file.
As an automatism i try to show thumbed files first, taking the original if
no thumb exists. This will help also for cases where no thumb could be
created... as for Word-Documents :-)
You may set the target resolution and size as you need.
I tried ThumbsUp in the same manner as above with varying results...
HTH
Wolfram
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