Java tutorial
package com.example.prathik1.drfarm; import java.io.BufferedReader; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL;import java.util.concurrent. import java.nio.file.Files; import java.nio.file.Paths; import android.util.Base64; import org.json.simple.JSONArray; import org.json.simple.JSONObject; import org.json.simple.parser.JSONParser; import org.json.simple.parser.ParseException; /* * * Sample class for OCRWebService.com (REST API) * */ public class OCRRestAPI { public static void main(String[] args) throws Exception { /* Sample project for OCRWebService.com (REST API). Extract text from scanned images and convert into editable formats. Please create new account with ocrwebservice.com via http://www.ocrwebservice.com/account/signup and get license code */ // Provide your user name and license code String license_code = <your license code>; String user_name = <your user name>; /* You should specify OCR settings. See full description http://www.ocrwebservice.com/service/restguide Input parameters: [language] - Specifies the recognition language. This parameter can contain several language names separated with commas. For example "language=english,german,spanish". Optional parameter. By default:english [pagerange] - Enter page numbers and/or page ranges separated by commas. For example "pagerange=1,3,5-12" or "pagerange=allpages". Optional parameter. By default:allpages [tobw] - Convert image to black and white (recommend for color image and photo). For example "tobw=false" Optional parameter. By default:false [zone] - Specifies the region on the image for zonal OCR. The coordinates in pixels relative to the left top corner in the following format: top:left:height:width. This parameter can contain several zones separated with commas. For example "zone=0:0:100:100,50:50:50:50" Optional parameter. [outputformat] - Specifies the output file format. Can be specified up to two output formats, separated with commas. For example "outputformat=pdf,txt" Optional parameter. By default:doc [gettext] - Specifies that extracted text will be returned. For example "tobw=true" Optional parameter. By default:false [description] - Specifies your task description. Will be returned in response. Optional parameter. !!!! For getting result you must specify "gettext" or "outputformat" !!!! */ // Build your OCR: // Extraction text with English language String ocrURL = "http://www.ocrwebservice.com/restservices/processDocument?gettext=true"; // Extraction text with English and German language using zonal OCR // ocrURL = "http://www.ocrwebservice.com/restservices/processDocument?language=english,german&zone=0:0:600:400,500:1000:150:400"; // Convert first 5 pages of multipage document into doc and txt // ocrURL = "http://www.ocrwebservice.com/restservices/processDocument?language=english&pagerange=1-5&outputformat=doc,txt"; // Full path to uploaded document String filePath = "C:\\sample_image.jpg"; byte[] fileContent = Files.readAllBytes(Paths.get(filePath)); URL url = new URL(ocrURL); HttpURLConnection connection = (HttpURLConnection)url.openConnection(); connection.setDoOutput(true); connection.setDoInput(true); connection.setRequestMethod("POST"); connection.setRequestProperty("Authorization", "Basic " + Base64.getEncoder().encodeToString((user_name + ":" + license_code).getBytes())); // Specify Response format to JSON or XML (application/json or application/xml) connection.setRequestProperty("Content-Type", "application/json"); connection.setRequestProperty("Content-Length", Integer.toString(fileContent.length)); OutputStream stream = connection.getOutputStream(); // Send POST request stream.write(fileContent); stream.close(); int httpCode = connection.getResponseCode(); System.out.println("HTTP Response code: " + httpCode); // Success request if (httpCode == HttpURLConnection.HTTP_OK) { // Get response stream String jsonResponse = GetResponseToString(connection.getInputStream()); // Parse and print response from OCR server PrintOCRResponse(jsonResponse); } else if (httpCode == HttpURLConnection.HTTP_UNAUTHORIZED) { System.out.println("OCR Error Message: Unauthorizied request"); } else { // Error occurred String jsonResponse = GetResponseToString(connection.getErrorStream()); JSONParser parser = new JSONParser(); JSONObject jsonObj = (JSONObject)parser.parse(jsonResponse); // Error message System.out.println("Error Message: " + jsonObj.get("ErrorMessage")); } connection.disconnect(); } private static void PrintOCRResponse(String jsonResponse) throws ParseException, IOException { // Parse JSON data JSONParser parser = new JSONParser(); JSONObject jsonObj = (JSONObject) parser.parse(jsonResponse); // Get available pages System.out.println("Available pages: " + jsonObj.get("AvailablePages")); // get an array from the JSON object JSONArray text = (JSONArray) jsonObj.get("OCRText"); // For zonal OCR: OCRText[z][p] z - zone, p - pages for (int i = 0; i < text.size(); i++) { System.out.println(" " + text.get(i)); } // Output file URL String outputFileUrl = (String) jsonObj.get("OutputFileUrl"); // If output file URL is specified if (outputFileUrl != null && !outputFileUrl.equals("")) { // Download output file DownloadConvertedFile(outputFileUrl); } } // Download converted output file from OCRWebService private static void DownloadConvertedFile(String outputFileUrl) throws IOException { URL downloadUrl = new URL(outputFileUrl); HttpURLConnection downloadConnection = (HttpURLConnection) downloadUrl.openConnection(); if (downloadConnection.getResponseCode() == HttpURLConnection.HTTP_OK) { InputStream inputStream = downloadConnection.getInputStream(); // opens an output stream to save into file FileOutputStream outputStream = new FileOutputStream("C:\\converted_file.doc"); int bytesRead = -1; byte[] buffer = new byte[4096]; while ((bytesRead = inputStream.read(buffer)) != -1) { outputStream.write(buffer, 0, bytesRead); } outputStream.close(); inputStream.close(); } downloadConnection.disconnect(); } private static String GetResponseToString(InputStream inputStream) throws IOException { InputStreamReader responseStream = new InputStreamReader(inputStream); BufferedReader br = new BufferedReader(responseStream); StringBuffer strBuff = new StringBuffer(); String s; while ((s = br.readLine()) != null) { strBuff.append(s); } return strBuff.toString(); } }