本地圖片和網絡圖片進行Base64加密

 /**
     * 對本地圖片文件二進制數據進行Base64加密
     *
     * @param imagePath
     * @return Base64加密後的二進制字符串
     * @throws IOException
     */
    public final String encodeBase64Image(String imagePath) throws IOException {
        File file = new File(imagePath);
        byte[] content = new byte[(int) file.length()];
        FileInputStream finputstream = null;
        try {
            finputstream = new FileInputStream(file);
            finputstream.read(content);
        } finally {
            if (finputstream != null)
                finputstream.close();
        }
        return new String(Base64.encodeBase64(content));
    }

    /**
     * 將網絡圖片轉換成Base64編碼字符串
     *
     * @param imgUrl 網絡圖片Url
     * @return
     */
    public static String getImgUrlToBase64(String imgUrl) {
        InputStream inputStream = null;
        ByteArrayOutputStream outputStream = null;
        byte[] buffer = null;
        try {
            // 創建URL
            URL url = new URL(imgUrl);
            // 創建鏈接
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("GET");
            conn.setConnectTimeout(5000);
            inputStream = conn.getInputStream();
            outputStream = new ByteArrayOutputStream();
            // 將內容讀取內存中
            buffer = new byte[1024];
            int len = -1;
            while ((len = inputStream.read(buffer)) != -1) {
                outputStream.write(buffer, 0, len);
            }
            buffer = outputStream.toByteArray();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (inputStream != null) {
                try {
                    // 關閉inputStream流
                    inputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (outputStream != null) {
                try {
                    // 關閉outputStream流
                    outputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        // 對字節數組Base64編碼
        return new BASE64Encoder().encode(buffer);
    }