如何在网页上显示由PHP调用的java代码生成的图像？

Question

I have a java jar file that generates an image upon completion. I need to call this from a PHP server. How do I display the image on the web page? exec() or passthru() do not offer features to return images.

Answer 1

If the image returned by Java is a valid image, in PHP you just need to send an additional header using the header() function, so the browser knows it's an image and not regular HTML.

E.g. (presuming the returned image is in JPEG format):

header('Content-Type: image/jpeg');
readfile('path/to/yourimage.jpg');

http://php.net/manual/en/function.header.php

http://php.net/manual/en/function.readfile.php

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Another way could be executing the JAR file with the exec() function. Should be something like this:

header('Content-Type: image/jpeg');
exec('java -jar /path/to/file.jar', $output);

http://php.net/manual/en/function.exec.php