Source Code Cross Referenced for UploadHandler.java in  » Swing-Library » Swinglets » com » javelin » swinglets » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Swing Library » Swinglets » com.javelin.swinglets 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * UploadHandler.java
003:         *
004:         * Created on 23 April 2000, 09:01
005:         * Checkout http://www.ietf.org/rfc/rfc1867.txt for the file upload protocol
006:         */
007:        package com.javelin.swinglets;
008:
009:        import javax.servlet.http.*;
010:        import java.io.*;
011:        import javax.servlet.*;
012:        import java.util.*;
013:
014:        /**
015:         *
016:         * @author  Dino
017:         * @version
018:         */
019:        public class UploadHandler {
020:
021:            HttpServletRequest request = null;
022:
023:            ServletInputStream in;
024:            int totalExpected;
025:            int totalRead = 0;
026:            byte[] buf = new byte[8192];
027:            StringBuffer sbuf = new StringBuffer();
028:
029:            private File dir = new File(".");
030:
031:            private Hashtable parameters = new Hashtable(); // name - Vector of values
032:            private Hashtable files = new Hashtable(); // name - UploadedFile
033:
034:            String boundary = null;
035:
036:            public UploadHandler(HttpServletRequest request) throws IOException {
037:                this .request = request;
038:                processForm();
039:            }
040:
041:            public Enumeration getParameterNames() {
042:                return parameters.keys();
043:            }
044:
045:            public Enumeration getUploadFiles() {
046:                return files.elements();
047:            }
048:
049:            public String getParameter(String name) {
050:                try {
051:                    Vector values = (Vector) parameters.get(name);
052:                    if (values == null || values.size() == 0) {
053:                        return null;
054:                    }
055:                    String value = (String) values.elementAt(values.size() - 1);
056:                    return value;
057:                } catch (Exception e) {
058:                    return null;
059:                }
060:            }
061:
062:            public String[] getParameterValues(String name) {
063:                try {
064:                    Vector values = (Vector) parameters.get(name);
065:                    if (values == null || values.size() == 0) {
066:                        return null;
067:                    }
068:                    String[] valuesArray = new String[values.size()];
069:                    values.copyInto(valuesArray);
070:                    return valuesArray;
071:                } catch (Exception e) {
072:                    return null;
073:                }
074:            }
075:
076:            private String getBoundary(String line) throws IOException {
077:                int index = line.lastIndexOf("boundary=");
078:                if (index == -1) {
079:                    return null;
080:                }
081:                String boundary = line.substring(index + 9);
082:
083:                boundary = "--" + boundary;
084:
085:                return boundary;
086:            }
087:
088:            protected void processForm() throws IOException {
089:                int length = request.getContentLength();
090:
091:                String ctype = request.getContentType();
092:                // must be a multipart form 
093:                if (ctype == null
094:                        || !ctype.toLowerCase().startsWith(
095:                                "multipart/form-data")) {
096:                    throw new IOException("Form isn't multipart/form-data");
097:                }
098:                // get the form boundary, very important
099:
100:                System.out.println("Content type=" + ctype);
101:                String type1 = request.getHeader("Content-Type");
102:                System.out.println("Content type1=" + type1);
103:                System.out.flush();
104:
105:                boundary = getBoundary(ctype);
106:
107:                // store inputstream
108:                in = request.getInputStream();
109:                totalExpected = length;
110:
111:                // get first line
112:                String line = readLine();
113:                if (line == null) {
114:                    throw new IOException("Could not read first line");
115:                }
116:
117:                // should start with the boundary
118:                if (!line.startsWith(boundary)) {
119:                    throw new IOException("Could not find boundary");
120:                }
121:
122:                // Handle each part of the form, may be a normal field, or may be a file
123:                boolean more = true;
124:                while (more) {
125:                    more = handleNextPart();
126:                }
127:
128:            }
129:
130:            protected String readLine() throws IOException {
131:                sbuf.setLength(0);
132:                int result;
133:
134:                do {
135:                    result = readLine(buf, 0, buf.length);
136:                    if (result != -1) {
137:                        sbuf.append(new String(buf, 0, result, "ISO-8859-1"));
138:                    }
139:                } while (result == buf.length); // loop only if the buffer was filled
140:
141:                if (sbuf.length() == 0) {
142:                    return null; // nothing read, must be at the end of stream
143:                }
144:
145:                sbuf.setLength(sbuf.length() - 2); // cut off the trailing \r\n
146:                return sbuf.toString();
147:            }
148:
149:            protected int readLine(byte b[], int off, int len)
150:                    throws IOException {
151:                if (totalRead >= totalExpected) {
152:                    return -1;
153:                }
154:
155:                int bytesLeft = totalExpected - totalRead;
156:                if (len > bytesLeft) {
157:                    len = bytesLeft;
158:                }
159:                int result = in.readLine(b, off, len);
160:                if (result > 0) {
161:                    totalRead += result;
162:                }
163:                return result;
164:            }
165:
166:            protected boolean handleNextPart() throws IOException {
167:                String line = readLine();
168:                if (line == null || line.length() == 0) {
169:                    return false;
170:                }
171:
172:                String[] dispArray = getDisposition(line);
173:                String disposition = dispArray[0];
174:                String paramname = dispArray[1];
175:                String filename = dispArray[2];
176:
177:                line = readLine();
178:                if (line == null) {
179:                    return false;
180:                }
181:
182:                String contentType = getContentType(line);
183:                if (contentType != null) {
184:                    line = readLine();
185:                    if (line == null || line.length() > 0) {
186:                        throw new IOException(
187:                                "Line should be empty after content type: "
188:                                        + line);
189:                    }
190:                } else {
191:                    contentType = "application/octet-stream";
192:                }
193:
194:                if (filename == null) {
195:                    String value = getParameter();
196:                    if ("".equals(value)) {
197:                        value = null;
198:                    }
199:                    Vector values = (Vector) parameters.get(paramname);
200:                    // if param never seen before then create vector
201:                    if (values == null) {
202:                        values = new Vector();
203:                        parameters.put(paramname, values);
204:                    }
205:                    values.addElement(value);
206:                } else {
207:                    System.out.println(new java.util.Date());
208:                    ByteArrayOutputStream stream = getStream();
209:                    System.out.println(new java.util.Date());
210:                    files.put(paramname, new UploadFile(stream, paramname,
211:                            filename, contentType));
212:
213:                }
214:                return true;
215:            }
216:
217:            protected String getParameter() throws IOException {
218:                StringBuffer sbuf = new StringBuffer();
219:                String line;
220:
221:                while ((line = readLine()) != null) {
222:                    if (line.startsWith(boundary))
223:                        break;
224:                    sbuf.append(line + "\r\n");
225:                }
226:
227:                if (sbuf.length() == 0) {
228:                    return null;
229:                }
230:
231:                sbuf.setLength(sbuf.length() - 2);
232:                return sbuf.toString();
233:            }
234:
235:            /*
236:             Returns disposition, name, and filename as an array of string
237:             Filename will be null if this part is not for a 
238:             */
239:            private String[] getDisposition(String line) throws IOException {
240:                String[] retval = new String[3];
241:
242:                String origline = line;
243:                line = origline.toLowerCase();
244:
245:                int startAt = line.indexOf("content-disposition: ");
246:                int endAt = line.indexOf(";");
247:                if (startAt == -1 || endAt == -1) {
248:                    throw new IOException("Invalid content disposition: "
249:                            + origline);
250:                }
251:                String disposition = line.substring(startAt + 21, endAt);
252:                if (!disposition.equals("form-data")) {
253:                    throw new IOException("Invalid content disposition: "
254:                            + disposition);
255:                }
256:
257:                startAt = line.indexOf("name=\"", endAt);
258:                endAt = line.indexOf("\"", startAt + 7);
259:                if (startAt == -1 || endAt == -1) {
260:                    throw new IOException("Content disposition corrupt: "
261:                            + origline);
262:                }
263:                String name = origline.substring(startAt + 6, endAt);
264:
265:                String filename = null;
266:                startAt = line.indexOf("filename=\"", endAt + 2);
267:                endAt = line.indexOf("\"", startAt + 10);
268:                if (startAt != -1 && endAt != -1) {
269:                    filename = origline.substring(startAt + 10, endAt);
270:
271:                    int slashAt = Math.max(filename.lastIndexOf('/'), filename
272:                            .lastIndexOf('\\'));
273:                    if (slashAt > -1) {
274:                        filename = filename.substring(slashAt + 1);
275:                    }
276:
277:                }
278:
279:                // Return a String array: disposition, name, filename
280:                retval[0] = disposition;
281:                retval[1] = name;
282:                retval[2] = filename;
283:                return retval;
284:            }
285:
286:            private String getContentType(String line) throws IOException {
287:                String contentType = null;
288:
289:                String origline = line;
290:                line = origline.toLowerCase();
291:
292:                if (line.startsWith("content-type")) {
293:                    int start = line.indexOf(" ");
294:                    if (start == -1) {
295:                        throw new IOException("Content type corrupt: "
296:                                + origline);
297:                    }
298:                    contentType = line.substring(start + 1);
299:                } else if (line.length() != 0) { // no content type, so should be empty
300:                    throw new IOException("Malformed line after disposition: "
301:                            + origline);
302:                }
303:
304:                return contentType;
305:            }
306:
307:            protected ByteArrayOutputStream getStream() throws IOException {
308:                ByteArrayOutputStream out = new ByteArrayOutputStream(32 * 1024);
309:
310:                byte[] bbuf = new byte[32 * 1024];
311:                int result;
312:                String line;
313:
314:                boolean rnflag = false;
315:                while ((result = readLine(bbuf, 0, bbuf.length)) != -1) {
316:
317:                    if (result > 2 && bbuf[0] == '-' && bbuf[1] == '-') {
318:                        line = new String(bbuf, 0, result, "ISO-8859-1");
319:                        if (line.startsWith(boundary))
320:                            break;
321:                    }
322:
323:                    if (rnflag) {
324:                        out.write('\r');
325:                        out.write('\n');
326:                        rnflag = false;
327:                    }
328:
329:                    if (result >= 2 && bbuf[result - 2] == '\r'
330:                            && bbuf[result - 1] == '\n') {
331:                        out.write(bbuf, 0, result - 2);
332:                        rnflag = true;
333:                    } else {
334:                        out.write(bbuf, 0, result);
335:                    }
336:                }
337:                out.flush();
338:                return out;
339:            }
340:
341:        }
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