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.DecodeHintType;
22 import com.google.zxing.LuminanceSource;
23 import com.google.zxing.MultiFormatReader;
24 import com.google.zxing.Reader;
25 import com.google.zxing.ReaderException;
26 import com.google.zxing.Result;
27 import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
28 import com.google.zxing.client.result.ParsedResult;
29 import com.google.zxing.client.result.ResultParser;
30 import com.google.zxing.common.HybridBinarizer;
32 import org.apache.commons.fileupload.FileItem;
33 import org.apache.commons.fileupload.FileUploadException;
34 import org.apache.commons.fileupload.disk.DiskFileItemFactory;
35 import org.apache.commons.fileupload.servlet.ServletFileUpload;
36 import org.apache.commons.lang.StringEscapeUtils;
37 import org.apache.http.Header;
38 import org.apache.http.HttpMessage;
39 import org.apache.http.HttpResponse;
40 import org.apache.http.HttpVersion;
41 import org.apache.http.HttpEntity;
42 import org.apache.http.client.HttpClient;
43 import org.apache.http.client.methods.HttpGet;
44 import org.apache.http.client.methods.HttpUriRequest;
45 import org.apache.http.conn.scheme.PlainSocketFactory;
46 import org.apache.http.conn.scheme.Scheme;
47 import org.apache.http.conn.scheme.SchemeRegistry;
48 import org.apache.http.conn.ssl.SSLSocketFactory;
49 import org.apache.http.conn.ClientConnectionManager;
50 import org.apache.http.impl.client.DefaultHttpClient;
51 import org.apache.http.impl.conn.SingleClientConnManager;
52 import org.apache.http.params.BasicHttpParams;
53 import org.apache.http.params.HttpParams;
54 import org.apache.http.params.HttpProtocolParams;
56 import java.awt.image.BufferedImage;
57 import java.io.IOException;
58 import java.io.InputStream;
59 import java.io.OutputStreamWriter;
60 import java.io.Writer;
61 import java.net.SocketException;
63 import java.net.URISyntaxException;
64 import java.net.UnknownHostException;
65 import java.util.Hashtable;
66 import java.util.List;
67 import java.util.Vector;
68 import java.util.logging.Logger;
70 import javax.imageio.ImageIO;
71 import javax.servlet.ServletConfig;
72 import javax.servlet.ServletException;
73 import javax.servlet.ServletRequest;
74 import javax.servlet.http.HttpServlet;
75 import javax.servlet.http.HttpServletRequest;
76 import javax.servlet.http.HttpServletResponse;
79 * {@link HttpServlet} which decodes images containing barcodes. Given a URL, it will
80 * retrieve the image and decode it. It can also process image files uploaded via POST.
84 public final class DecodeServlet extends HttpServlet {
86 private static final long MAX_IMAGE_SIZE = 500000L;
88 private static final Logger log = Logger.getLogger(DecodeServlet.class.getName());
90 static final Hashtable<DecodeHintType, Object> HINTS;
93 HINTS = new Hashtable<DecodeHintType, Object>(5);
94 HINTS.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);
95 Vector<BarcodeFormat> possibleFormats = new Vector<BarcodeFormat>();
96 possibleFormats.add(BarcodeFormat.UPC_A);
97 possibleFormats.add(BarcodeFormat.UPC_E);
98 possibleFormats.add(BarcodeFormat.EAN_8);
99 possibleFormats.add(BarcodeFormat.EAN_13);
100 possibleFormats.add(BarcodeFormat.CODE_39);
101 possibleFormats.add(BarcodeFormat.CODE_128);
102 possibleFormats.add(BarcodeFormat.ITF);
103 possibleFormats.add(BarcodeFormat.QR_CODE);
104 possibleFormats.add(BarcodeFormat.DATAMATRIX);
105 possibleFormats.add(BarcodeFormat.PDF417);
106 HINTS.put(DecodeHintType.POSSIBLE_FORMATS, possibleFormats);
109 private HttpParams params;
110 private SchemeRegistry registry;
111 private DiskFileItemFactory diskFileItemFactory;
114 public void init(ServletConfig servletConfig) {
116 Logger logger = Logger.getLogger("com.google.zxing");
117 logger.addHandler(new ServletContextLogHandler(servletConfig.getServletContext()));
119 params = new BasicHttpParams();
120 HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);
122 registry = new SchemeRegistry();
123 registry.register(new Scheme("http", PlainSocketFactory.getSocketFactory(), 80));
124 registry.register(new Scheme("https", SSLSocketFactory.getSocketFactory(), 443));
126 diskFileItemFactory = new DiskFileItemFactory();
128 log.info("DecodeServlet configured");
132 protected void doGet(HttpServletRequest request, HttpServletResponse response)
133 throws ServletException, IOException {
134 String imageURIString = request.getParameter("u");
135 if (imageURIString == null || imageURIString.length() == 0) {
136 response.sendRedirect("badurl.jspx");
140 if (!(imageURIString.startsWith("http://") || imageURIString.startsWith("https://"))) {
141 imageURIString = "http://" + imageURIString;
146 imageURI = new URI(imageURIString);
147 } catch (URISyntaxException urise) {
148 response.sendRedirect("badurl.jspx");
152 ClientConnectionManager connectionManager = new SingleClientConnManager(params, registry);
153 HttpClient client = new DefaultHttpClient(connectionManager, params);
155 HttpUriRequest getRequest = new HttpGet(imageURI);
156 getRequest.addHeader("Connection", "close"); // Avoids CLOSE_WAIT socket issue?
160 HttpResponse getResponse;
162 getResponse = client.execute(getRequest);
163 } catch (IllegalArgumentException iae) {
164 // Thrown if hostname is bad or null
166 response.sendRedirect("badurl.jspx");
168 } catch (SocketException se) {
169 // Thrown if hostname is bad or null
171 response.sendRedirect("badurl.jspx");
173 } catch (UnknownHostException uhe) {
175 response.sendRedirect("badurl.jspx");
179 if (getResponse.getStatusLine().getStatusCode() != HttpServletResponse.SC_OK) {
180 response.sendRedirect("badurl.jspx");
183 if (!isSizeOK(getResponse)) {
184 response.sendRedirect("badimage.jspx");
188 log.info("Decoding " + imageURI);
189 HttpEntity entity = getResponse.getEntity();
190 InputStream is = entity.getContent();
192 processStream(is, request, response);
194 entity.consumeContent();
199 connectionManager.shutdown();
205 protected void doPost(HttpServletRequest request, HttpServletResponse response)
206 throws ServletException, IOException {
208 if (!ServletFileUpload.isMultipartContent(request)) {
209 response.sendRedirect("badimage.jspx");
213 ServletFileUpload upload = new ServletFileUpload(diskFileItemFactory);
214 upload.setFileSizeMax(MAX_IMAGE_SIZE);
218 for (FileItem item : (List<FileItem>) upload.parseRequest(request)) {
219 if (!item.isFormField()) {
220 if (item.getSize() <= MAX_IMAGE_SIZE) {
221 log.info("Decoding uploaded file");
222 InputStream is = item.getInputStream();
224 processStream(is, request, response);
229 response.sendRedirect("badimage.jspx");
234 } catch (FileUploadException fue) {
235 response.sendRedirect("badimage.jspx");
240 private static void processStream(InputStream is, ServletRequest request,
241 HttpServletResponse response) throws ServletException, IOException {
242 BufferedImage image = ImageIO.read(is);
244 response.sendRedirect("badimage.jspx");
248 Reader reader = new MultiFormatReader();
251 LuminanceSource source = new BufferedImageLuminanceSource(image);
252 BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
253 result = reader.decode(bitmap, HINTS);
254 } catch (ReaderException re) {
255 log.info("DECODE FAILED: " + re.toString());
256 response.sendRedirect("notfound.jspx");
260 if (request.getParameter("full") == null) {
261 response.setContentType("text/plain");
262 response.setCharacterEncoding("UTF8");
263 Writer out = new OutputStreamWriter(response.getOutputStream(), "UTF8");
265 out.write(result.getText());
270 request.setAttribute("result", result);
271 byte[] rawBytes = result.getRawBytes();
272 if (rawBytes != null) {
273 request.setAttribute("rawBytesString", arrayToString(rawBytes));
275 request.setAttribute("rawBytesString", "(Not applicable)");
277 String text = result.getText();
279 request.setAttribute("text", StringEscapeUtils.escapeXml(text));
281 request.setAttribute("text", "(Not applicable)");
283 ParsedResult parsedResult = ResultParser.parseResult(result);
284 request.setAttribute("parsedResult", parsedResult);
285 String displayResult = parsedResult.getDisplayResult();
286 if (displayResult != null) {
287 request.setAttribute("displayResult", StringEscapeUtils.escapeXml(displayResult));
289 request.setAttribute("displayResult", "(Not applicable)");
291 request.getRequestDispatcher("decoderesult.jspx").forward(request, response);
295 private static boolean isSizeOK(HttpMessage getResponse) {
296 Header lengthHeader = getResponse.getLastHeader("Content-Length");
297 if (lengthHeader != null) {
298 long length = Long.parseLong(lengthHeader.getValue());
299 if (length > MAX_IMAGE_SIZE) {
306 private static String arrayToString(byte[] bytes) {
307 int length = bytes.length;
308 StringBuilder result = new StringBuilder(length << 2);
311 int max = Math.min(i + 8, length);
312 for (int j = i; j < max; j++) {
313 int value = bytes[j] & 0xFF;
314 result.append(Integer.toHexString(value / 16));
315 result.append(Integer.toHexString(value % 16));
321 for (int j = i - 8; j < length; j++) {
322 result.append(Integer.toHexString(bytes[j] & 0xFF));
325 return result.toString();
329 public void destroy() {
330 log.config("DecodeServlet shutting down...");