anderson wrote:
>
> My database contains a field that has the name and path of an image (Gif or JPG ), I
> need to show the image inside the window, and this window must have the same width
> and height of the image. To do it I need to get the image size with the JSP.
>
That's exactly what I need. I'm trying to write some code that checks
for the image width and height. It works perfectly for GIF type images
but I can't get it to work for JPEG. any ideas ?
<code>:
import java.io.*;
import br.vip.util.LogWriter;
public class ImageSizer extends Object {
private int _height;
private int _width;
private int _type; // 1 denotes gif, 2 denotes jpeg
private String _name;
private File _f;
private LogWriter _log;
public ImageSizer(File f) throws IOException, FileNotFoundException,
Exception{
_name = f.getName();
_f = f;
_log = log;
setType();
setSize();
}
private void setType() throws IOException, FileNotFoundException{
String ext = _name.substring(_name.length() - 3, _name.length());
if (ext.equals("gif")){
_type = 1;
} else if (ext.equals("jpg")){
_log.log("set Type JPG", LogWriter.DEBUG);
_type = 2;
} else {
throw new IOException("Invalid Image Format!");
}
}
private void setSize() throws IOException, FileNotFoundException,
Exception{
switch(_type){
case 1:{
sizeGIF();
break;
}
case 2:{
_log.log("setSize(2)", LogWriter.ERROR);
sizeJPEG();
break;
}
}
}
private void sizeGIF() throws IOException, FileNotFoundException{
byte a[] = new byte[2];
FileInputStream img = new FileInputStream(_f);
img.skip(6L);
img.read(a);
_width = ((short)a[0] | ((short)a[1])<<8);
img.read(a);
_height = ((short)a[0] | ((short)a[1])<<8);
}
private void sizeJPEG() throws IOException, FileNotFoundException,
Exception{
byte a[] = new byte[2];
int marker = 0;
FileInputStream img = new FileInputStream(_f);
if (img.read() != 0xFF){
throw new Exception("Not a JPEG Header!");
}
if (img.read() != 0xD8){
throw new Exception("Not a JPEG Header!");
}
for (;;){
marker = getNextMarker(img);
switch(marker){
case 0xC0:
case 0xC1:
case 0xC2:
case 0xC3:
case 0xC5:
case 0xC6:
case 0xC7:
case 0xC9:
case 0xCA:
case 0xCB:
case 0xCD:
case 0xCE:
case 0xCF:{
_log.log("Executing case: " + Integer.toHexString(marker) ,
LogWriter.ERROR);
img.skip(3);
img.read(a);
_height = (((short)a[0]) << 8) + ((short) a[1]);
img.read(a);
_width = (((short)a[0]) << 8) + (short)a[1];
return;
}
}
}
}
private int getNextMarker(FileInputStream img) throws IOException{
int c;
c = img.read();
while (c != 0xff) {
if ((c = img.read()) == -1){
return 0xD9;
}
}
do {
if ((c = img.read()) == -1)
return 0xD9;
} while (c == 0xff);
return c;
}
public int getHeight(){
return _height;
}
public int getWidth(){
return _width;
}
}
--
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