java - How to create an image from an InputStream, resize it and save it? -

i have code inputstream , create image:

part file; // more code try {         inputstream = file.getinputstream();          file f = new file("c:\\imagenesalmacen\\qr\\olakease.jpg");          outputstream os = new fileoutputstream(f);         byte[] buf = new byte[1024];         int len;          while ((len = is.read(buf)) > 0) {             os.write(buf, 0, len);         }          os.close();         is.close();      } catch (ioexception e) {         system.out.println("error");     } 

the problem have resize image before create if inputstream

so how resize inputstream , create resized image. want set largest side of image 180px , resize other side proportion.

example:

image = 289px * 206px resized image = 180px* 128px

i did this:

try {          inputstream = file.getinputstream();         image image = imageio.read(is);          bufferedimage bi = this.createresizedcopy(image, 180, 180, true);         imageio.write(bi, "jpg", new file("c:\\imagenesalmacen\\qr\\olakease.jpg"));      } catch (ioexception e) {         system.out.println("error");     }  bufferedimage createresizedcopy(image originalimage, int scaledwidth, int scaledheight, boolean preservealpha) {     int imagetype = preservealpha ? bufferedimage.type_int_rgb : bufferedimage.type_int_argb;     bufferedimage scaledbi = new bufferedimage(scaledwidth, scaledheight, imagetype);     graphics2d g = scaledbi.creategraphics();     if (preservealpha) {         g.setcomposite(alphacomposite.src);     }     g.drawimage(originalimage, 0, 0, scaledwidth, scaledheight, null);     g.dispose();     return scaledbi; } 

and did not use other code.

hope helps someone!