java代码实现OCR---第三方接口

public static String documentOCR(String filepath){
        ByteArrayOutputStream bos = new   ByteArrayOutputStream();
        String result = "";
        try {
            File file = new File(filepath);
            // url 够买合合科技OCR文字识别码----也可加我微信所要------ 微信号： RoninStreet
            URL url = new URL("");
            HttpURLConnection con = (HttpURLConnection) url.openConnection();
            con.setDoOutput(true);
            con.setDoInput(true);
            con.setRequestMethod("POST");
            con.setRequestProperty("transfer-encoding", "chunked");
            OutputStream out = con.getOutputStream();
            FileInputStream inputStream = new FileInputStream(file);
            byte[] data = new byte[2048];
            int len = 0;
            int sum = 0;
            while ((len = inputStream.read(data))!= -1) {
                out.write(data, 0, len);
                sum = len + sum;
            }
            //System.out.println("upload size="+sum);
            out.flush();
            inputStream.close();
            out.close();

            int code = con.getResponseCode();
            //System.out.println("code="+code+ " url="+url);
            if (code==200) {
                InputStream inputStream2 = con.getInputStream();

                while ((len = inputStream2.read(data))!= -1) {
                    bos.write(data, 0, len);
                }
                String a = bos.toString();
                result = a.substring(a.toString().indexOf("[")+1,a.toString().lastIndexOf("]"));
                //System.out.println("result ="+bos.toString());
                inputStream2.close();
                bos.close();
            }
            con.disconnect();
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }