JAVA实现图片大小的改变

下面程序是将一张图片修改成50*50的图片 ，可以通过修改 new_wi和new_he来调整

public byte[] imageChangeSize(byte[] data) throws IOException {

int orig_wi = 0 ;

int orig_hi = 0 ;

int fin_w = 0 ;

int fin_h = 0 ;

int new_wi = 50;

int new_he = 50;

// byte[] data = getPicture(row, col);

InputStream is = new ByteArrayInputStream(data);

BufferedImage bufImg = ImageIO.read(is);

orig_wi = bufImg.getWidth();

orig_hi = bufImg.getHeight();

if(orig_wi < new_wi){

fin_w = orig_wi;

}else{

fin_w = new_wi;

}

if(orig_hi < new_he){

fin_h = orig_hi;

}else{

fin_h = new_he;

}

BufferedImage bf = new BufferedImage(new_wi,new_he,BufferedImage.TYPE_INT_RGB );

bf.getGraphics().drawImage(bufImg.getScaledInstance(fin_w, fin_h, Image.SCALE_SMOOTH),0,0,fin_w, fin_h,null);

ByteArrayOutputStream out = new ByteArrayOutputStream();

JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);

encoder.encode(bf);

byte[] re = out.toByteArray();

return re;

}