从网络获取图片资源压缩后到本地

1、从网络获取图片资源下载到本地

public static void main(String[] args) throws IOException {
        String path = "https://wwwqWuPi5lTRK5TyI9zyVGg3fc=";
        long newPath = System.currentTimeMillis();
        String path1 = "C:\\Users\\a\\Desktop\\qrcode\\"+newPath+".jpg";
        locaImage(path,path1);
    }

    /**
     * 根据地址获得数据的字节流
     * @param strUrl
     * @return
     */
    public static byte[] getImageFromNetByUrl(String strUrl) {
        try {
            URL url = new URL(strUrl);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("GET");
            conn.setConnectTimeout(5 * 1000);
            InputStream inStream = conn.getInputStream();// 通过输入流获取图片数据
            byte[] btImg = readInputStream(inStream);// 得到图片的二进制数据
            return btImg;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 从输入流中获取数据
     * @param inStream
     * @return
     * @throws Exception
     */
    public static byte[] readInputStream(InputStream inStream) throws Exception {
        ByteArrayOutputStream outStream = new ByteArrayOutputStream();
        byte[] buffer = new byte[10240];
        int len = 0;
        while ((len = inStream.read(buffer)) != -1) {
            outStream.write(buffer, 0, len);
        }
        inStream.close();
        return outStream.toByteArray();
    }

    /**
     * 将图片写入到磁盘
     * @param img
     * @param zipImageUrl
     */
    public static void writeImageToDisk(byte[] img, String zipImageUrl) {
        try {
            File file = new File(zipImageUrl);
            FileOutputStream fops = new FileOutputStream(file);
            fops.write(img);
            fops.flush();
            fops.close();
            System.out.println("图片已经写入"+zipImageUrl);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 通过资源地址从网络获取图片资源并下载
     * @param fileUrl
     * @param fileZipUrl
     */
    public static void locaImage(String fileUrl,String fileZipUrl){
        byte[] btImg = getImageFromNetByUrl(fileUrl);
        if (null != btImg && btImg.length > 0) {
            writeImageToDisk(btImg, fileZipUrl);
        }
    }

 

2、从网络获取图片资源先压缩后保存到本地

public static void main(String[] args) throws IOException {
String path = "https://wwwt/Kl&Expires=1593670794&Signature=xcUHqWuPi5lTRK5TyI9zyVGg3fc=";
long newPath = System.currentTimeMillis();
String path2 = "C:\\Users\\a\\Desktop\\qrcode\\789.jpg";
URL url = new URL(path);
Thumbnails.of(url).outputQuality(0.5f).scale(0.5f).toFile(path2);
}

　　

3、从网络获取图片资源先保存到本地再压缩再保存

public static void main(String[] args) throws IOException {
String path = "https://wwweyId=l0klDK1vEUxht/Kl&Expires=1593670794&Signature=xcUHqWuPi5lTRK5TyI9zyVGg3fc=";
long newPath = System.currentTimeMillis();
String path1 = "C:\\Users\\a\\Desktop\\qrcode\\"+newPath+".jpg";
String path2 = "C:\\Users\\a\\Desktop\\qrcode\\789.jpg";
locaImage(path,path1);
Thumbnails.of(path1).outputQuality(0.5f).scale(0.5f).toFile(path2);

}