有时前台根据路径不能显示图片 因为他可能访问不到后台url路径 需要我们转一下处理显示图片

//根据fileUrl转base64码
    public String urlToBase(String fileUrl) throws Exception{
        String baseStr = null;
        ByteArrayOutputStream data = new ByteArrayOutputStream();
        byte[] buff = new byte[2048];
        InputStream inputStream = null;
        URL url = null;
        HttpURLConnection conn = null;
        url = new URL(fileUrl);
        conn = (HttpURLConnection) url.openConnection();
        conn.setDoInput(true);
        conn.connect();
        inputStream = conn.getInputStream();
        int num = -1;
        while ((num = inputStream.read(buff)) != -1) {
            data.write(buff, 0, num);
        }
        BASE64Encoder encoder = new BASE64Encoder();
        baseStr = encoder.encode(data.toByteArray());
        return baseStr;
    }

fileUrl : "http: //xxxx. png? sgdndjhdnd＂
转完base64 : “ivhdhdjdgdjGxdjhdh.”