Hi all,
I need to obtain image dimensions (for gif and jpeg)
from within the servlet.
eg. "a.jpeg" is 456 x 234 pixels
Reading the image headers via URLConnection
returns only ContentLength and ContentType.
See output trace and test code below.
What do I need to call to get the image dimensions
from the header?
Any help greatly appreciated.
Regards,
Andreas.
-trace----------------------------------------------------------------
---------------
> java testURL ./a.jpg
url.toString =file://localhost./a.jpg
url.toExternalForm =file://localhost./a.jpg
content.toString =sun.awt.image.URLImageSource@1dacdb85
content.getClass =class sun.awt.image.URLImageSource
connecting
con.getContentLength =23328
con.getContentType =image/jpeg
con.getContentEncoding =null
0. con.getHeaderFieldKey =content-type
0. con.getHeaderField =image/jpeg
1. con.getHeaderFieldKey =Content-length
1. con.getHeaderField =23328
2. con.getHeaderFieldKey =null
2. con.getHeaderField =null
...[cut for brevity]
9. con.getHeaderFieldKey =null
9. con.getHeaderField =null
content is image
-testURL.java---------------------------------------------------------
----------
import java.net.*;
import java.io.*;
import java.util.*;
import sun.awt.image.*;
public class testURL
{
/*
** test
*/
public static void main( String[] args )
{
if (args.length < 1)
{
System.err.println("usage: java testURL <url> [debug]");
System.exit(0);
}
String paramString = args[0];
boolean Debug = (args.length > 1) ? true : false;
URL url = null;
Object content = null;
try
{
// url = new URL( paramString );
url = new URL( "file", "localhost", paramString );
System.out.println("url.toString ="+ url.toString() );
System.out.println("url.toExternalForm ="+ url.toExternalForm() );
content = url.getContent();
System.out.println("content.toString ="+ content.toString() );
System.out.println("content.getClass ="+ content.getClass() );
URLConnection con = url.openConnection();
System.out.println("connecting");
con.connect();
System.out.println("con.getContentLength ="+con.getContentLength() );
System.out.println("con.getContentType ="+con.getContentType() );
System.out.println("con.getContentEncoding ="+con.getContentEncoding() );
for (int i=0; i<10; i++)
{
System.out.println(i+". con.getHeaderFieldKey
="+con.getHeaderFieldKey(i) );
System.out.println(i+". con.getHeaderField ="+con.getHeaderField(i) );
}
if ( content.toString().startsWith("sun.awt.image.URLImageSource") )
{
System.out.println("content is image");
URLImageSource image = new URLImageSource(con);
}
}
catch (Exception e)
{
System.out.println(e.getMessage());
e.printStackTrace();
}
}
}
-eof------------------------------------------------------------------
----------
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