關于圖片與base64相互轉換的工具類

最近在編寫平臺對接軟件，需要從Oracle中取出blob類型圖片數據轉換為base64字符串寫入到xml中，這里記錄一下用到的轉換方法

// 將一張本地圖片轉化成Base64字符串
public  static String GetImageStrFromPath(String imgPath) {
    InputStream in = null;
    byte[] data = null;
    // 讀取圖片字節數組
    try {
        in = new FileInputStream(imgPath);
        data = new byte[in.available()];
        in.read(data);
        in.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
    // 對字節數組Base64編碼
    BASE64Encoder encoder = new BASE64Encoder();
    // 返回Base64編碼過的字節數組字符串
    return encoder.encode(data);
}

// 將一張網絡圖片轉化成Base64字符串
public  String GetImageStrFromUrl(String imgURL) {
    byte[] data = null;
    try {
        // 創建URL
        URL url = new URL(imgURL);
        // 創建鏈接
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setRequestMethod("GET");
        conn.setConnectTimeout(5 * 1000);
        InputStream inStream = conn.getInputStream();
        data = new byte[inStream.available()];
        inStream.read(data);
        inStream.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
    // 對字節數組Base64編碼
    BASE64Encoder encoder = new BASE64Encoder();
    // 返回Base64編碼過的字節數組字符串
    return encoder.encode(data);
}

// 將blob類型圖片轉換為Base64字符串
public static String blobToBase64(Blob blob) {
    String result = "";
    if (null != blob) {
        try {
            InputStream msgContent = blob.getBinaryStream();
            ByteArrayOutputStream output = new ByteArrayOutputStream();
            byte[] buffer = new byte[100];
            int n = 0;
            while (-1 != (n = msgContent.read(buffer))) {
                output.write(buffer, 0, n);
            }
            result = new BASE64Encoder().encode(output.toByteArray());
            output.close();
        } catch (SQLException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    } else {
        return null;
    }
}

// 將base64字符串轉換成圖片
public static boolean GenerateImage(String imgStr) {
    if (imgStr == null) // 圖像數據為空
        return false;
    BASE64Decoder decoder = new BASE64Decoder();
    try {
        // Base64解碼
        byte[] b = decoder.decodeBuffer(imgStr);
        for (int i = 0; i < b.length; ++i) {
            if (b[i] < 0) {// 調整異常數據
                b[i] += 256;
            }
        }
        // 生成jpeg圖片
        String imgFilePath = "d://222.jpg";
        OutputStream out = new FileOutputStream(imgFilePath);
        out.write(b);
        out.flush();
        out.close();
        return true;
    } catch (Exception e) {
        return false;
    }
}