读取阿里云服务器图片到本地

港控/mmm° 2022-06-04 00:18 307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);
        }