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1
7
8 package java.net;
9
10 import java.io.IOException  ;
11 import java.io.InputStream ;
12 import java.io.OutputStream ;
13 import java.util.Hashtable ;
14 import java.util.Date ;
15 import java.util.StringTokenizer ;
16 import java.util.Collections ;
17 import java.util.Map ;
18 import java.util.List ;
19 import java.security.Permission ;
20 import java.security.AccessController ;
21 import sun.security.util.SecurityConstants;
22
23
151 public abstract class URLConnection {
152
153
166 protected URL url;
167
168
181 protected boolean doInput = true;
182
183
196 protected boolean doOutput = false;
197
198 private static boolean defaultAllowUserInteraction = false;
199
200
217 protected boolean allowUserInteraction = defaultAllowUserInteraction;
218
219 private static boolean defaultUseCaches = true;
220
221
236 protected boolean useCaches = defaultUseCaches;
237
238
256 protected long ifModifiedSince = 0;
257
258
263 protected boolean connected = false;
264
265
268 private int connectTimeout;
269 private int readTimeout;
270
271
274 private static FileNameMap fileNameMap;
275
276
279 private static boolean fileNameMapLoaded = false;
280
281
292 public static synchronized FileNameMap getFileNameMap() {
293 if ((fileNameMap == null) && !fileNameMapLoaded) {
294 fileNameMap = sun.net.www.MimeTable.loadTable();
295 fileNameMapLoaded = true;
296 }
297
298 return new FileNameMap () {
299 private FileNameMap map = fileNameMap;
300 public String getContentTypeFor(String fileName) {
301 return map.getContentTypeFor(fileName);
302 }
303 };
304 }
305
306
321 public static void setFileNameMap(FileNameMap map) {
322 SecurityManager sm = System.getSecurityManager();
323 if (sm != null) sm.checkSetFactory();
324 fileNameMap = map;
325 }
326
327
351 abstract public void connect() throws IOException ;
352
353
373 public void setConnectTimeout(int timeout) {
374 if (timeout < 0) {
375 throw new IllegalArgumentException ("timeout can not be negative");
376 }
377 connectTimeout = timeout;
378 }
379
380
392 public int getConnectTimeout() {
393 return connectTimeout;
394 }
395
396
416 public void setReadTimeout(int timeout) {
417 if (timeout < 0) {
418 throw new IllegalArgumentException ("timeout can not be negative");
419 }
420 readTimeout = timeout;
421 }
422
423
434 public int getReadTimeout() {
435 return readTimeout;
436 }
437
438
444 protected URLConnection(URL url) {
445 this.url = url;
446 }
447
448
456 public URL getURL() {
457 return url;
458 }
459
460
467 public int getContentLength() {
468 return getHeaderFieldInt("content-length", -1);
469 }
470
471
478 public String getContentType() {
479 return getHeaderField("content-type");
480 }
481
482
489 public String getContentEncoding() {
490 return getHeaderField("content-encoding");
491 }
492
493
501 public long getExpiration() {
502 return getHeaderFieldDate("expires", 0);
503 }
504
505
513 public long getDate() {
514 return getHeaderFieldDate("date", 0);
515 }
516
517
525 public long getLastModified() {
526 return getHeaderFieldDate("last-modified", 0);
527 }
528
529
540 public String getHeaderField(String name) {
541 return null;
542 }
543
544
554 public Map <String ,List <String >> getHeaderFields() {
555 return Collections.EMPTY_MAP;
556 }
557
558
572 public int getHeaderFieldInt(String name, int Default) {
573 String value = getHeaderField(name);
574 try {
575 return Integer.parseInt(value);
576 } catch (Exception e) { }
577 return Default;
578 }
579
580
596 public long getHeaderFieldDate(String name, long Default) {
597 String value = getHeaderField(name);
598 try {
599 return Date.parse(value);
600 } catch (Exception e) { }
601 return Default;
602 }
603
604
613 public String getHeaderFieldKey(int n) {
614 return null;
615 }
616
617
631 public String getHeaderField(int n) {
632 return null;
633 }
634
635
678 public Object getContent() throws IOException {
679 getInputStream();
683 return getContentHandler().getContent(this);
684 }
685
686
705 public Object getContent(Class [] classes) throws IOException {
706 getInputStream();
710 return getContentHandler().getContent(this, classes);
711 }
712
713
752 public Permission getPermission() throws IOException {
753 return SecurityConstants.ALL_PERMISSION;
754 }
755
756
771 public InputStream getInputStream() throws IOException {
772 throw new UnknownServiceException ("protocol doesn't support input");
773 }
774
775
784 public OutputStream getOutputStream() throws IOException {
785 throw new UnknownServiceException ("protocol doesn't support output");
786 }
787
788
793 public String toString() {
794 return this.getClass().getName() + ":" + url;
795 }
796
797
810 public void setDoInput(boolean doinput) {
811 if (connected)
812 throw new IllegalStateException ("Already connected");
813 doInput = doinput;
814 }
815
816
824 public boolean getDoInput() {
825 return doInput;
826 }
827
828
840 public void setDoOutput(boolean dooutput) {
841 if (connected)
842 throw new IllegalStateException ("Already connected");
843 doOutput = dooutput;
844 }
845
846
854 public boolean getDoOutput() {
855 return doOutput;
856 }
857
858
866 public void setAllowUserInteraction(boolean allowuserinteraction) {
867 if (connected)
868 throw new IllegalStateException ("Already connected");
869 allowUserInteraction = allowuserinteraction;
870 }
871
872
880 public boolean getAllowUserInteraction() {
881 return allowUserInteraction;
882 }
883
884
892 public static void setDefaultAllowUserInteraction(boolean defaultallowuserinteraction) {
893 defaultAllowUserInteraction = defaultallowuserinteraction;
894 }
895
896
908 public static boolean getDefaultAllowUserInteraction() {
909 return defaultAllowUserInteraction;
910 }
911
912
929 public void setUseCaches(boolean usecaches) {
930 if (connected)
931 throw new IllegalStateException ("Already connected");
932 useCaches = usecaches;
933 }
934
935
943 public boolean getUseCaches() {
944 return useCaches;
945 }
946
947
955 public void setIfModifiedSince(long ifmodifiedsince) {
956 if (connected)
957 throw new IllegalStateException ("Already connected");
958 ifModifiedSince = ifmodifiedsince;
959 }
960
961
967 public long getIfModifiedSince() {
968 return ifModifiedSince;
969 }
970
971
983 public boolean getDefaultUseCaches() {
984 return defaultUseCaches;
985 }
986
987
994 public void setDefaultUseCaches(boolean defaultusecaches) {
995 defaultUseCaches = defaultusecaches;
996 }
997
998
1014 public void setRequestProperty(String key, String value) {
1015 if (connected)
1016 throw new IllegalStateException ("Already connected");
1017 if (key == null)
1018 throw new NullPointerException ("key is null");
1019 }
1020
1021 |
Java API By Example, From Geeks To Geeks.