读取阿里云服务器图片到本地-蒲公英云

读取阿里云服务器图片到本地

港控/mmm° 2022-06-04 00:18 364阅读 0赞

摘要：根据阿里云服务器图片路径，读取保存到本地，分2步，先是把图片加密成
字符串，在通过解密这字符串保存在本地磁盘

一.图片加密

传入图片地址即可

public static String imageBase64(String path) {
        InputStream in = null;
        ByteArrayOutputStream byteArrOps = null;
        int length = -1;
        byte[] buffer = new byte[1024 * 2];
        byte[] data = null;
        // 加密
        BASE64Encoder encoder = new BASE64Encoder();
        try {
            URL url = new URL(path);
            HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
            urlConnection.setRequestMethod("GET");
            urlConnection.setReadTimeout(1000 * 10);
            if (urlConnection.getResponseCode() == 200) {
                in = urlConnection.getInputStream();
                byteArrOps = new ByteArrayOutputStream();
                while ((length = in.read(buffer)) != -1) {
                    byteArrOps.write(buffer, 0, length);
                }
                //总大小
                int totalSize = urlConnection.getContentLength();
                byteArrOps.flush();
                data = byteArrOps.toByteArray();
                // 下载大小: data.length
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (byteArrOps != null) {
                    byteArrOps.close();
                }
                if (in != null) {
                    in.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return encoder.encode(data);
    }

二.图片解密
第一个参数是图片的加密字符串，第二个参数是你保存本地的路径，后面加一个图片的名即可

public static boolean generateImage(String imgStr, String path) {
        if (imgStr == null)
            return false;
        BASE64Decoder decoder = new BASE64Decoder();
        try {
            // 解密
            byte[] b = decoder.decodeBuffer(imgStr);
            // 处理数据
            for (int i = 0; i < b.length; ++i) {
                if (b[i] < 0) {
                    b[i] += 256;
                }
            }
            OutputStream out = new FileOutputStream(path);
            out.write(b);
            out.flush();
            out.close();
            return true;
        } catch (Exception e) {
            return false;
        }
    }

三.测试
我这里图片取名为2.jpg

public static void main(String[] args){
        String imgPath = "阿里云图片路径";
        String str = imageBase64(imgPath);
        boolean b = generateImage(str, "D:\\2.jpg");
        System.out.println(b);
    }