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.GlobalHistogramBinarizer;
31 import com.google.zxing.common.HybridBinarizer;
33 import org.apache.commons.fileupload.FileItem;
34 import org.apache.commons.fileupload.FileUploadException;
35 import org.apache.commons.fileupload.disk.DiskFileItemFactory;
36 import org.apache.commons.fileupload.servlet.ServletFileUpload;
37 import org.apache.commons.lang.StringEscapeUtils;
38 import org.apache.http.Header;
39 import org.apache.http.HttpMessage;
40 import org.apache.http.HttpResponse;
41 import org.apache.http.HttpVersion;
42 import org.apache.http.HttpEntity;
43 import org.apache.http.client.HttpClient;
44 import org.apache.http.client.methods.HttpGet;
45 import org.apache.http.client.methods.HttpUriRequest;
46 import org.apache.http.conn.scheme.PlainSocketFactory;
47 import org.apache.http.conn.scheme.Scheme;
48 import org.apache.http.conn.scheme.SchemeRegistry;
49 import org.apache.http.conn.ssl.SSLSocketFactory;
50 import org.apache.http.conn.ClientConnectionManager;
51 import org.apache.http.impl.client.DefaultHttpClient;
52 import org.apache.http.impl.conn.SingleClientConnManager;
53 import org.apache.http.params.BasicHttpParams;
54 import org.apache.http.params.HttpParams;
55 import org.apache.http.params.HttpProtocolParams;
57 import java.awt.image.BufferedImage;
58 import java.io.IOException;
59 import java.io.InputStream;
60 import java.io.OutputStreamWriter;
61 import java.io.Writer;
62 import java.net.SocketException;
64 import java.net.URISyntaxException;
65 import java.net.UnknownHostException;
66 import java.util.Hashtable;
67 import java.util.List;
68 import java.util.Vector;
69 import java.util.logging.Logger;
71 import javax.imageio.ImageIO;
72 import javax.servlet.ServletConfig;
73 import javax.servlet.ServletException;
74 import javax.servlet.ServletRequest;
75 import javax.servlet.http.HttpServlet;
76 import javax.servlet.http.HttpServletRequest;
77 import javax.servlet.http.HttpServletResponse;
80 * {@link HttpServlet} which decodes images containing barcodes. Given a URL, it will
81 * retrieve the image and decode it. It can also process image files uploaded via POST.
85 public final class DecodeServlet extends HttpServlet {
87 private static final long MAX_IMAGE_SIZE = 500000L;
89 private static final Logger log = Logger.getLogger(DecodeServlet.class.getName());
91 static final Hashtable<DecodeHintType, Object> HINTS;
94 HINTS = new Hashtable<DecodeHintType, Object>(5);
95 HINTS.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);
96 Vector<BarcodeFormat> possibleFormats = new Vector<BarcodeFormat>();
97 possibleFormats.add(BarcodeFormat.UPC_A);
98 possibleFormats.add(BarcodeFormat.UPC_E);
99 possibleFormats.add(BarcodeFormat.EAN_8);
100 possibleFormats.add(BarcodeFormat.EAN_13);
101 possibleFormats.add(BarcodeFormat.CODE_39);
102 possibleFormats.add(BarcodeFormat.CODE_128);
103 possibleFormats.add(BarcodeFormat.ITF);
104 possibleFormats.add(BarcodeFormat.QR_CODE);
105 possibleFormats.add(BarcodeFormat.DATAMATRIX);
106 possibleFormats.add(BarcodeFormat.PDF417);
107 HINTS.put(DecodeHintType.POSSIBLE_FORMATS, possibleFormats);
110 private HttpParams params;
111 private SchemeRegistry registry;
112 private DiskFileItemFactory diskFileItemFactory;
115 public void init(ServletConfig servletConfig) {
117 Logger logger = Logger.getLogger("com.google.zxing");
118 logger.addHandler(new ServletContextLogHandler(servletConfig.getServletContext()));
120 params = new BasicHttpParams();
121 HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);
123 registry = new SchemeRegistry();
124 registry.register(new Scheme("http", PlainSocketFactory.getSocketFactory(), 80));
125 registry.register(new Scheme("https", SSLSocketFactory.getSocketFactory(), 443));
127 diskFileItemFactory = new DiskFileItemFactory();
129 log.info("DecodeServlet configured");
133 protected void doGet(HttpServletRequest request, HttpServletResponse response)
134 throws ServletException, IOException {
135 String imageURIString = request.getParameter("u");
136 if (imageURIString == null || imageURIString.length() == 0) {
137 response.sendRedirect("badurl.jspx");
141 if (!(imageURIString.startsWith("http://") || imageURIString.startsWith("https://"))) {
142 imageURIString = "http://" + imageURIString;
147 imageURI = new URI(imageURIString);
148 } catch (URISyntaxException urise) {
149 response.sendRedirect("badurl.jspx");
153 ClientConnectionManager connectionManager = new SingleClientConnManager(params, registry);
154 HttpClient client = new DefaultHttpClient(connectionManager, params);
156 HttpUriRequest getRequest = new HttpGet(imageURI);
157 getRequest.addHeader("Connection", "close"); // Avoids CLOSE_WAIT socket issue?
161 HttpResponse getResponse;
163 getResponse = client.execute(getRequest);
164 } catch (IllegalArgumentException iae) {
165 // Thrown if hostname is bad or null
167 response.sendRedirect("badurl.jspx");
169 } catch (SocketException se) {
170 // Thrown if hostname is bad or null
172 response.sendRedirect("badurl.jspx");
174 } catch (UnknownHostException uhe) {
176 response.sendRedirect("badurl.jspx");
180 if (getResponse.getStatusLine().getStatusCode() != HttpServletResponse.SC_OK) {
181 response.sendRedirect("badurl.jspx");
184 if (!isSizeOK(getResponse)) {
185 response.sendRedirect("badimage.jspx");
189 log.info("Decoding " + imageURI);
190 HttpEntity entity = getResponse.getEntity();
191 InputStream is = entity.getContent();
193 processStream(is, request, response);
195 entity.consumeContent();
200 connectionManager.shutdown();
206 protected void doPost(HttpServletRequest request, HttpServletResponse response)
207 throws ServletException, IOException {
209 if (!ServletFileUpload.isMultipartContent(request)) {
210 response.sendRedirect("badimage.jspx");
214 ServletFileUpload upload = new ServletFileUpload(diskFileItemFactory);
215 upload.setFileSizeMax(MAX_IMAGE_SIZE);
219 for (FileItem item : (List<FileItem>) upload.parseRequest(request)) {
220 if (!item.isFormField()) {
221 if (item.getSize() <= MAX_IMAGE_SIZE) {
222 log.info("Decoding uploaded file");
223 InputStream is = item.getInputStream();
225 processStream(is, request, response);
230 response.sendRedirect("badimage.jspx");
235 } catch (FileUploadException fue) {
236 response.sendRedirect("badimage.jspx");
241 private static void processStream(InputStream is, ServletRequest request,
242 HttpServletResponse response) throws ServletException, IOException {
243 BufferedImage image = ImageIO.read(is);
245 response.sendRedirect("badimage.jspx");
249 Reader reader = new MultiFormatReader();
252 LuminanceSource source = new BufferedImageLuminanceSource(image);
253 BinaryBitmap bitmap = new BinaryBitmap(new GlobalHistogramBinarizer(source));
254 result = reader.decode(bitmap, HINTS);
255 } catch (ReaderException re) {
256 log.info("DECODE FAILED: " + re.toString());
257 response.sendRedirect("notfound.jspx");
261 if (request.getParameter("full") == null) {
262 response.setContentType("text/plain");
263 response.setCharacterEncoding("UTF8");
264 Writer out = new OutputStreamWriter(response.getOutputStream(), "UTF8");
266 out.write(result.getText());
271 request.setAttribute("result", result);
272 byte[] rawBytes = result.getRawBytes();
273 if (rawBytes != null) {
274 request.setAttribute("rawBytesString", arrayToString(rawBytes));
276 request.setAttribute("rawBytesString", "(Not applicable)");
278 String text = result.getText();
280 request.setAttribute("text", StringEscapeUtils.escapeXml(text));
282 request.setAttribute("text", "(Not applicable)");
284 ParsedResult parsedResult = ResultParser.parseResult(result);
285 request.setAttribute("parsedResult", parsedResult);
286 String displayResult = parsedResult.getDisplayResult();
287 if (displayResult != null) {
288 request.setAttribute("displayResult", StringEscapeUtils.escapeXml(displayResult));
290 request.setAttribute("displayResult", "(Not applicable)");
292 request.getRequestDispatcher("decoderesult.jspx").forward(request, response);
296 private static boolean isSizeOK(HttpMessage getResponse) {
297 Header lengthHeader = getResponse.getLastHeader("Content-Length");
298 if (lengthHeader != null) {
299 long length = Long.parseLong(lengthHeader.getValue());
300 if (length > MAX_IMAGE_SIZE) {
307 private static String arrayToString(byte[] bytes) {
308 int length = bytes.length;
309 StringBuilder result = new StringBuilder(length << 2);
312 int max = Math.min(i + 8, length);
313 for (int j = i; j < max; j++) {
314 int value = bytes[j] & 0xFF;
315 result.append(Integer.toHexString(value / 16));
316 result.append(Integer.toHexString(value % 16));
322 for (int j = i - 8; j < length; j++) {
323 result.append(Integer.toHexString(bytes[j] & 0xFF));
326 return result.toString();
330 public void destroy() {
331 log.config("DecodeServlet shutting down...");