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Java Forum / General / May 2005Java Newbie... Read file at HTTP
Hi, I need the code for "loading" a picture over www (ex. http://www.xyz.com/pic.jpg). I need only to load it, I do not need to save it on my disk or something like that... Sounds useless and it is... But I want to learn it and I need it :-) Greetings How do you mean *load*? If you want an image: BufferedImage bi = ImageIO.read(urlForXYZ.com); you then have the image. If you need just a file over HTTP: URL image = new URL(urlForXYZ.com, pic.jpg); URLConnection con = getImages.openConnection(); con.setDoInput(true); con.setUseCaches(false); InputStream stream = con.getInputStream(); ... do something with the stream stream.close(); con.close(); > Hi, > [quoted text clipped - 4 lines] > > Greetings  Signaturehttp://lloyd-duke.net + news AT website.domain OOPS! sorry cut and paste got the best of me :-( that second part should read If you need just a file over HTTP: URL image = new URL(urlForXYZ.com, "pic.jpg"); URLConnection con = image.openConnection(); con.setDoInput(true); con.setUseCaches(false); InputStream stream = con.getInputStream(); ... do something with the stream stream.close(); con.close(); > How do you mean *load*? > If you want an image: [quoted text clipped - 22 lines] >> >> Greetings Signaturehttp://lloyd-duke.net + news AT website.domain Hi Lloyd, so... I've made some mistakes... I guess! The compiler says: Building target "MakeTraffic" with build style "Development" (optimization:level 'N/A', debug-symbols:off) - (5 errors) frameworkjars="" for i in `echo ` ; do if [ -f "$i" ] ; then frameworkjars="$frameworkjars":"$i" ; fi ; done classpath="/Users/sdz/Desktop/Tempora¨res Verzeichnis/XCode/maketraffic/MakeTraffic/build/MakeTraffic.build/MakeTraffic.build/JavaClasses$frameworkjars:"`/usr/bin/javaconfig DefaultClasspath` /usr/bin/javac -J-Xms64m -J-XX:NewSize=4M -J-Dfile.encoding=UTF8 -g -encoding MACINTOSH -sourcepath "/Users/sdz/Desktop/Tempora¨res Verzeichnis/XCode/maketraffic/MakeTraffic/." -classpath "$classpath" -d "/Users/sdz/Desktop/Tempora¨res Verzeichnis/XCode/maketraffic/MakeTraffic/build/MakeTraffic.build/MakeTraffic.build/JavaClasses" '@/Users/sdz/Desktop/Tempora¨res Verzeichnis/XCode/maketraffic/MakeTraffic/build/MakeTraffic.build/MakeTraffic.build/JavaFileList' MakeTraffic.java:3: cannot resolve symbol symbol : class URL location: class MakeTraffic URL image = new URL("www.darknob.de","IMGA0356.JPG"); ^ MakeTraffic.java:3: cannot resolve symbol symbol : class URL location: class MakeTraffic URL image = new URL("www.darknob.de","IMGA0356.JPG"); ^ MakeTraffic.java:4: cannot resolve symbol symbol : class URLConnection location: class MakeTraffic URLConnection con = image; ^ MakeTraffic.java:5: cannot resolve symbol symbol : method openConnection () location: class MakeTraffic openConnection(); ^ MakeTraffic.java:8: cannot resolve symbol symbol : class InputStream location: class MakeTraffic InputStream stream = con.getInputStream(); ^ 5 errors MakeTraffic.java:3: cannot resolve symbol symbol : class URL MakeTraffic.java:3: cannot resolve symbol symbol : class URL MakeTraffic.java:4: cannot resolve symbol symbol : class URLConnection MakeTraffic.java:5: cannot resolve symbol symbol : method openConnection () MakeTraffic.java:8: cannot resolve symbol symbol : class InputStream :-( I'm a java newbie! Could you post the source that caused this error? It seems that at *minimum* you don't have java.net or java.io imported into your source. You should familurise yourself with these packages if you wish to do any type of network programing. Also the NIO package is WELL worth the time to look at. > Hi Lloyd, > [quoted text clipped - 55 lines] > > :-( I'm a java newbie! Signaturehttp://lloyd-duke.net + news AT website.domain That's my source... :-( import java.net.*; import java.io.*; class MakeTraffic { MakeTraffic () { URL image = new URL("www.darknob.de","IMGA0356.JPG"); URLConnection con = image; openConnection(); con.setDoInput(true); con.setUseCaches(false); InputStream stream = con.getInputStream(); // stream.close(); con.close(); } public static void main(String [] args) { new MakeTraffic(); } } Get always errors, I hope that I'm not to stupid for Java! :-( > URLConnection con = image; > openConnection(); Should be: URLConnection con = image.openConnection(); Ok... Got already some mistakes: Building target "MakeTraffic" with build style "Development" (optimization:level 'N/A', debug-symbols:off) - (2 errors) frameworkjars="" for i in `echo ` ; do if [ -f "$i" ] ; then frameworkjars="$frameworkjars":"$i" ; fi ; done classpath="/Users/sdz/Desktop/Tempora¨res Verzeichnis/XCode/maketraffic/MakeTraffic/build/MakeTraffic.build/MakeTraffic.build/JavaClasses$frameworkjars:"`/usr/bin/javaconfig DefaultClasspath` /usr/bin/javac -J-Xms64m -J-XX:NewSize=4M -J-Dfile.encoding=UTF8 -g -encoding MACINTOSH -sourcepath "/Users/sdz/Desktop/Tempora¨res Verzeichnis/XCode/maketraffic/MakeTraffic/." -classpath "$classpath" -d "/Users/sdz/Desktop/Tempora¨res Verzeichnis/XCode/maketraffic/MakeTraffic/build/MakeTraffic.build/MakeTraffic.build/JavaClasses" '@/Users/sdz/Desktop/Tempora¨res Verzeichnis/XCode/maketraffic/MakeTraffic/build/MakeTraffic.build/MakeTraffic.build/JavaFileList' MakeTraffic.java:6: cannot resolve symbol symbol : constructor URL (java.lang.String,java.lang.String) location: class java.net.URL URL image = new URL("www.darknob.de","IMGA0356.JPG"); ^ MakeTraffic.java:13: cannot resolve symbol symbol : method close () location: class java.net.URLConnection con.close(); ^ 2 errors MakeTraffic.java:6: cannot resolve symbol symbol : constructor URL (java.lang.String,java.lang.String) MakeTraffic.java:13: cannot resolve symbol symbol : method close () With that Source code: import java.net.*; import java.io.*; class MakeTraffic { MakeTraffic () { URL image = new URL("www.darknob.de","IMGA0356.JPG"); URLConnection con = image.openConnection(); con.setDoInput(true); con.setUseCaches(false); InputStream stream = con.getInputStream(); // stream.close(); con.close(); } public static void main(String [] args) { new MakeTraffic(); } } Any idea? > MakeTraffic.java:6: cannot resolve symbol > symbol : constructor URL (java.lang.String,java.lang.String) > location: class java.net.URL > URL image = new URL("www.darknob.de","IMGA0356.JPG"); You need to take a look at the documentation for the classes you are using. On my Mac, for 1.4.2 with the dev tools and java dev tools installed, they are in file:///System/Library/Frameworks/JavaVM.framework/Versions/1.4.2/Resourc es/Documentation/Reference/doc/api/java/net/URL.html . In this case, there is no (String,String) constructor for URL. There is an URL(String host, int port, String file), and an URL(String), among others. > ^ > MakeTraffic.java:13: cannot resolve symbol > symbol : method close () > location: class java.net.URLConnection > con.close(); Again, read the javadocs. Do you see a "close" method in your jdk javadocs? If not, then it does not exist and cannot be used. The javadocs are a good thing to peruse when you get error messages, as they often contain interesting facts about how to use the classes in question. If they do not contain enough information, go hunting for tutorials. I find the Sun-provided ones pretty good. Scott Free MagazinesGet these publications absolutely FREE for up to 12 months. 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