2 * Copyright 2008 ZXing authors
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 package com.google.zxing.web;
19 import com.google.zxing.BarcodeFormat;
20 import com.google.zxing.BinaryBitmap;
21 import com.google.zxing.ChecksumException;
22 import com.google.zxing.DecodeHintType;
23 import com.google.zxing.FormatException;
24 import com.google.zxing.LuminanceSource;
25 import com.google.zxing.MultiFormatReader;
26 import com.google.zxing.NotFoundException;
27 import com.google.zxing.Reader;
28 import com.google.zxing.ReaderException;
29 import com.google.zxing.Result;
30 import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
31 import com.google.zxing.client.result.ParsedResult;
32 import com.google.zxing.client.result.ResultParser;
33 import com.google.zxing.common.GlobalHistogramBinarizer;
34 import com.google.zxing.common.HybridBinarizer;
36 import org.apache.commons.fileupload.FileItem;
37 import org.apache.commons.fileupload.FileUploadException;
38 import org.apache.commons.fileupload.disk.DiskFileItemFactory;
39 import org.apache.commons.fileupload.servlet.ServletFileUpload;
40 import org.apache.commons.lang.StringEscapeUtils;
41 import org.apache.http.Header;
42 import org.apache.http.HttpMessage;
43 import org.apache.http.HttpResponse;
44 import org.apache.http.HttpVersion;
45 import org.apache.http.HttpEntity;
46 import org.apache.http.client.HttpClient;
47 import org.apache.http.client.methods.HttpGet;
48 import org.apache.http.client.methods.HttpUriRequest;
49 import org.apache.http.conn.scheme.PlainSocketFactory;
50 import org.apache.http.conn.scheme.Scheme;
51 import org.apache.http.conn.scheme.SchemeRegistry;
52 import org.apache.http.conn.ssl.SSLSocketFactory;
53 import org.apache.http.conn.ClientConnectionManager;
54 import org.apache.http.impl.client.DefaultHttpClient;
55 import org.apache.http.impl.conn.SingleClientConnManager;
56 import org.apache.http.params.BasicHttpParams;
57 import org.apache.http.params.HttpParams;
58 import org.apache.http.params.HttpProtocolParams;
60 import java.awt.image.BufferedImage;
61 import java.io.IOException;
62 import java.io.InputStream;
63 import java.io.OutputStreamWriter;
64 import java.io.Writer;
65 import java.net.SocketException;
67 import java.net.URISyntaxException;
68 import java.net.UnknownHostException;
69 import java.util.Collection;
70 import java.util.Hashtable;
71 import java.util.List;
72 import java.util.Vector;
73 import java.util.logging.Logger;
75 import javax.imageio.ImageIO;
76 import javax.servlet.ServletConfig;
77 import javax.servlet.ServletException;
78 import javax.servlet.ServletRequest;
79 import javax.servlet.http.HttpServlet;
80 import javax.servlet.http.HttpServletRequest;
81 import javax.servlet.http.HttpServletResponse;
84 * {@link HttpServlet} which decodes images containing barcodes. Given a URL, it will
85 * retrieve the image and decode it. It can also process image files uploaded via POST.
89 public final class DecodeServlet extends HttpServlet {
91 private static final long MAX_IMAGE_SIZE = 2000000L;
93 private static final Logger log = Logger.getLogger(DecodeServlet.class.getName());
95 static final Hashtable<DecodeHintType, Object> HINTS;
98 HINTS = new Hashtable<DecodeHintType, Object>(5);
99 HINTS.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);
100 Collection<BarcodeFormat> possibleFormats = new Vector<BarcodeFormat>();
101 possibleFormats.add(BarcodeFormat.UPC_A);
102 possibleFormats.add(BarcodeFormat.UPC_E);
103 possibleFormats.add(BarcodeFormat.EAN_8);
104 possibleFormats.add(BarcodeFormat.EAN_13);
105 possibleFormats.add(BarcodeFormat.CODE_39);
106 possibleFormats.add(BarcodeFormat.CODE_128);
107 possibleFormats.add(BarcodeFormat.ITF);
108 possibleFormats.add(BarcodeFormat.RSS14);
109 possibleFormats.add(BarcodeFormat.QR_CODE);
110 possibleFormats.add(BarcodeFormat.DATAMATRIX);
111 possibleFormats.add(BarcodeFormat.PDF417);
112 HINTS.put(DecodeHintType.POSSIBLE_FORMATS, possibleFormats);
115 private HttpParams params;
116 private SchemeRegistry registry;
117 private DiskFileItemFactory diskFileItemFactory;
120 public void init(ServletConfig servletConfig) {
122 Logger logger = Logger.getLogger("com.google.zxing");
123 logger.addHandler(new ServletContextLogHandler(servletConfig.getServletContext()));
125 params = new BasicHttpParams();
126 HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);
128 registry = new SchemeRegistry();
129 registry.register(new Scheme("http", PlainSocketFactory.getSocketFactory(), 80));
130 registry.register(new Scheme("https", SSLSocketFactory.getSocketFactory(), 443));
132 diskFileItemFactory = new DiskFileItemFactory();
134 log.info("DecodeServlet configured");
138 protected void doGet(HttpServletRequest request, HttpServletResponse response)
139 throws ServletException, IOException {
140 String imageURIString = request.getParameter("u");
141 if (imageURIString == null || imageURIString.length() == 0) {
142 response.sendRedirect("badurl.jspx");
146 if (!(imageURIString.startsWith("http://") || imageURIString.startsWith("https://"))) {
147 imageURIString = "http://" + imageURIString;
152 imageURI = new URI(imageURIString);
153 } catch (URISyntaxException urise) {
154 response.sendRedirect("badurl.jspx");
158 ClientConnectionManager connectionManager = new SingleClientConnManager(params, registry);
159 HttpClient client = new DefaultHttpClient(connectionManager, params);
161 HttpUriRequest getRequest = new HttpGet(imageURI);
162 getRequest.addHeader("Connection", "close"); // Avoids CLOSE_WAIT socket issue?
166 HttpResponse getResponse;
168 getResponse = client.execute(getRequest);
169 } catch (IllegalArgumentException iae) {
170 // Thrown if hostname is bad or null
172 response.sendRedirect("badurl.jspx");
174 } catch (SocketException se) {
175 // Thrown if hostname is bad or null
177 response.sendRedirect("badurl.jspx");
179 } catch (UnknownHostException uhe) {
181 response.sendRedirect("badurl.jspx");
185 if (getResponse.getStatusLine().getStatusCode() != HttpServletResponse.SC_OK) {
186 response.sendRedirect("badurl.jspx");
189 if (!isSizeOK(getResponse)) {
190 response.sendRedirect("badimage.jspx");
194 log.info("Decoding " + imageURI);
195 HttpEntity entity = getResponse.getEntity();
196 InputStream is = entity.getContent();
198 processStream(is, request, response);
200 entity.consumeContent();
205 connectionManager.shutdown();
211 protected void doPost(HttpServletRequest request, HttpServletResponse response)
212 throws ServletException, IOException {
214 if (!ServletFileUpload.isMultipartContent(request)) {
215 response.sendRedirect("badimage.jspx");
219 ServletFileUpload upload = new ServletFileUpload(diskFileItemFactory);
220 upload.setFileSizeMax(MAX_IMAGE_SIZE);
224 for (FileItem item : (List<FileItem>) upload.parseRequest(request)) {
225 if (!item.isFormField()) {
226 if (item.getSize() <= MAX_IMAGE_SIZE) {
227 log.info("Decoding uploaded file");
228 InputStream is = item.getInputStream();
230 processStream(is, request, response);
235 response.sendRedirect("badimage.jspx");
240 } catch (FileUploadException fue) {
241 response.sendRedirect("badimage.jspx");
246 private static void processStream(InputStream is, ServletRequest request,
247 HttpServletResponse response) throws ServletException, IOException {
248 BufferedImage image = ImageIO.read(is);
250 response.sendRedirect("badimage.jspx");
254 Reader reader = new MultiFormatReader();
257 LuminanceSource source = new BufferedImageLuminanceSource(image);
258 BinaryBitmap bitmap = new BinaryBitmap(new GlobalHistogramBinarizer(source));
259 result = reader.decode(bitmap, HINTS);
260 } catch (ReaderException re) {
262 // Try again with other binarizer
263 LuminanceSource source = new BufferedImageLuminanceSource(image);
264 BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
265 result = reader.decode(bitmap, HINTS);
266 } catch (NotFoundException nfe) {
267 log.info("Not found: " + re.toString());
268 response.sendRedirect("notfound.jspx");
270 } catch (FormatException fe) {
271 log.info("Format problem: " + re.toString());
272 response.sendRedirect("format.jspx");
274 } catch (ChecksumException ce) {
275 log.info("Checksum problem: " + re.toString());
276 response.sendRedirect("format.jspx");
281 if (request.getParameter("full") == null) {
282 response.setContentType("text/plain");
283 response.setCharacterEncoding("UTF8");
284 Writer out = new OutputStreamWriter(response.getOutputStream(), "UTF8");
286 out.write(result.getText());
291 request.setAttribute("result", result);
292 byte[] rawBytes = result.getRawBytes();
293 if (rawBytes != null) {
294 request.setAttribute("rawBytesString", arrayToString(rawBytes));
296 request.setAttribute("rawBytesString", "(Not applicable)");
298 String text = result.getText();
300 request.setAttribute("text", StringEscapeUtils.escapeXml(text));
302 request.setAttribute("text", "(Not applicable)");
304 ParsedResult parsedResult = ResultParser.parseResult(result);
305 request.setAttribute("parsedResult", parsedResult);
306 String displayResult = parsedResult.getDisplayResult();
307 if (displayResult != null) {
308 request.setAttribute("displayResult", StringEscapeUtils.escapeXml(displayResult));
310 request.setAttribute("displayResult", "(Not applicable)");
312 request.getRequestDispatcher("decoderesult.jspx").forward(request, response);
316 private static boolean isSizeOK(HttpMessage getResponse) {
317 Header lengthHeader = getResponse.getLastHeader("Content-Length");
318 if (lengthHeader != null) {
319 long length = Long.parseLong(lengthHeader.getValue());
320 if (length > MAX_IMAGE_SIZE) {
327 private static String arrayToString(byte[] bytes) {
328 int length = bytes.length;
329 StringBuilder result = new StringBuilder(length << 2);
332 int max = Math.min(i + 8, length);
333 for (int j = i; j < max; j++) {
334 int value = bytes[j] & 0xFF;
335 result.append(Integer.toHexString(value / 16));
336 result.append(Integer.toHexString(value % 16));
342 for (int j = i - 8; j < length; j++) {
343 result.append(Integer.toHexString(bytes[j] & 0xFF));
346 return result.toString();
350 public void destroy() {
351 log.config("DecodeServlet shutting down...");