java对比图片_Java实现图片比对-逐像素对比

图片对比的另一种方式是通过将图片每一个像素的RGB值提取出来，然后比较两个图片每一个像素的RGB值；该方法的问题是速度比较慢，需要消耗较大的空间；

private static InputStream getImageStreamFromWeb(String urlAddress) {

URL url = null;

HttpURLConnection conn = null;

try {

url = new URL(urlAddress);

conn = (HttpURLConnection) url.openConnection();

if (conn.getResponseCode() == 200) {

InputStream in = conn.getInputStream();

return in;

} else {

throw new PictureNotFoundError("can not found #ADD# picture: "

+ urlAddress);

}

} catch (Exception e) {

}

return null;

}

public static String[][] getPX(InputStream in) {

int[] rgb = new int[3];

BufferedImage bi = null;

try {

bi = ImageIO.read(in);

} ca