Java通过地址远程读取图片并转换为Base64字符串-526互联

使用java自带类实现获取图片并转换为Base64字符串(记录一下)

如果下载失败或者出现异常，则直接返回输入的图片地址

public String ImageBase64(String imgUrl) {
    URL url = null;
    InputStream is = null;
    ByteArrayOutputStream outStream = null;
    HttpURLConnection httpUrl = null;
    try {
        url = new URL(imgUrl);
        httpUrl = (HttpURLConnection) url.openConnection();
        httpUrl.connect();
        httpUrl.getInputStream();
        is = httpUrl.getInputStream();

        outStream = new ByteArrayOutputStream();
        //创建一个Buffer字符串
        byte[] buffer = new byte[1024];
        //每次读取的字符串长度，如果为-1，代表全部读取完毕
        int len = 0;
        //使用一个输入流从buffer里把数据读取出来
        while ((len = is.read(buffer)) != -1) {
            //用输出流往buffer里写入数据，中间参数代表从哪个位置开始读，len代表读取的长度
            outStream.write(buffer, 0, len);
        }
        // 对字节数组Base64编码
        return new BASE64Encoder().encode(outStream.toByteArray());
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        if (is != null) {
            try {
                is.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        if (outStream != null) {
            try {
                outStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        if (httpUrl != null) {
            httpUrl.disconnect();
        }
    }
    return imgUrl;
}

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