א א א א א Java K א א א א א א א א א א א א א א א א א א א א א א א א א א א א Java.

Transcription

1 א א א א א Java א א א א א א א א א א א א א א א א א א א א Java IO א KIOException א א א א Java IO K א א א א א א (stream) א א א א א א א א א Java 1.4 א א א א א א א K א א א א err out in 1.11 Kerr out in Java

2 الجزء الثاني: منصة العمل 128 אSystem.in א א א א byte teamname[] = new byte[200]; int size = System.in.read(teamName); System.out.write(teamName,0,size); K א א א System.out א א א א אK System.out.print("Team complete"); א א System.err א א א K א א System.err.println("Not enough players"); KIOException א א א 2.11 א א א א א 1.11 א א א א K א א

3 129 الفصل الحادي عشر : عمليات الا دخال والا خراج الا ساسية الشكل 1.11 مجاري الكتابة والقراءة ومجاري الدخل والخرج الشاي عة. E אF א א א Writer Reader א OutputStream InputStream א K א א א

4 الجزء الثاني: منصة العمل א א א K א א א א W א BufferedReader b = new BufferedReader(FileReader); Data InputStream d = new DataInputStream (new BufferedInputStream(FileInputStream)); PrintWriter p = new PrintWriter(FileWriter); DataOutputStream y = new DataOutputStream (new BufferedOutputStream(FileOutputStream)); W א W W BufferedReader א א א א FileReader א א א readline() א א close() א א א א א א א BufferedReader breader = new BufferedReader (new FileReader("Master.txt")); KBufferedReader א

5 131 الفصل الحادي عشر : عمليات الا دخال والا خراج الا ساسية String linecontents; while ((linecontents = breader.readline( ))!= null) {...} breader.close(); DataInputStream א א א א א א read() א א א א א א א אKInputStream DataInputStream instream = new DataInputStream (new FileInputStream("Team.bin")); instream.read(); א א א א א א K א א BufferedInputStream DataInputStream instream = new DataInputStream (new BufferedInputStream(new FileInputStream(team))); א א א א א א unread(int i); // pushback a single byte unread(byte[] b); // pushback array of bytes KPushbackInputStream א א PrintWriter א א א close() א PrintWriter א א אK String in = "A huge line of text"; PrintWriter pwriter = new PrintWriter

6 الجزء الثاني: منصة العمل 132 (new FileWriter("CoachList.txt")); pwriter.println(in); pwriter.close(); FileWriter א א א א א א אK FileWriter FileWriter fwriter = new FileWriter("CoachList.txt"); fwriter.write("this is the coach list."); fwriter.close(); DataOutputStream א א א א א writeint() א K א File positions = new File("Positions.bin"); Int[] pos = {0, 1, 2, 3, 4}; DataOutputStream outstream = new DataOutputStream (new FileOutputStream(positions)); for (int i = 0; i < pos.length; i++) outstream.writeint(pos[i]); א א א א אKBufferedOutputStream DataOutputStream outstream = new DataOutputStream (new BufferedOutputStream(positions));

7 133 الفصل الحادي عشر : عمليات الا دخال والا خراج الا ساسية (socket) א א א א K א BufferedReader b = new BufferedReader (new InputStreamReader(InputStream)); DataInputStream d = new Data InputStream (new BufferedInputStream(FileInputStream)); PrintWriter p = new PrintWriter(FileWriter); DataOutputStream y = new DataOutputStream (new BufferedOutputStream(FileOutputStream)); W א W א W W א א א א K א א BufferedReader א Socket socket = new Socket(" ", 64783); InputStreamReader reader = new InputStreamReader (socket.getinputstream( )); BufferedReader breader = new BufferedReader(reader); String msg = breader.readline();

8 الجزء الثاني: منصة العمل DataInputStream א א א א אread() א א א Kjava.net א Socket Socket socket = new Socket(" ", 64783); DataInputStream instream = new DataInputStream (socket.getinputstream( )); instream.read(); א א א K א א BufferedInputStream א DataInputStream instream = new DataInputStream (new BufferedInputStream(socket.getInputStream( ))); א K א א א א PrintWriter א Socket socket = new Socket(" ", 64783); PrintWriter pwriter = new PrintWriter (socket.getoutputstream( )); pwriter.println("dad, we won the game."); DataOutputStream א א א א write() אK byte positions[] = new byte[10]; Socket socket = new Socket(" ", 64783); DataOutputStream outstream = new DataOutputStream

9 135 الفصل الحادي عشر : عمليات الا دخال والا خراج الا ساسية (socket.getoutputstream( )); outstream.write(positions, 0, 10); א א אKBufferedOutputStream DataOutputStream outstream = new DataOutputStream (new BufferedOutputStream(socket.getOutputStream( ))); 5.11 א א א א א א Serializable א א א א א א transient א אdeserialization) ) - א א א א א - א א Java א א א א K א ObjectInputStream א ObjectOutputStream א א א K KObjectOutputStream א א ObjectOutputStream s = new ObjectOutputStream(new FileOutputStream("p.ser")); ObjectOutputStream ostream = new ObjectOutputStream(new W א

10 الجزء الثاني: منصة العمل 136 FileOutputStream("PlayerDat.ser")); ostream.writeobject(player); ostream.close(); ObjectInputStream א א K א א א א א ObjectInputStream d = new ObjectInputStream(new FileInputStream("p.ser")); ObjectInputStream istream = new ObjectInputStream(new FileInputStream("PlayerDat.ser")); Player p = (Player) istream.readobject( ); W א 6.11 ZIP א Java א א GZIP א ZIP K א GZIP א א א ZipOutputStream K ZipInputSteam א ZipOutputStream zipout = new ZipOutputStream( new FileOutputStream("out.zip")); String[] fnames = new String[] {"f1", "f2"}; for (int i = 0; i < fnames.length; i++) { ZipEntry entry = new ZipEntry(fNames[i]); File InputStream fin = new FileInputStream(fNames[i]); try { zipout.putnextentry(entry);

11 137 الفصل الحادي عشر : عمليات الا دخال والا خراج الا ساسية for (int a = fin.read( ); a!= -1; a = fin.read()) { zipout.write(a); } fin.close(); zipout.close(); } catch (IOException ioe) {...} } א ZipInputStream א KOutputStream א א א getnextentry() GZIP GZIPOutputStream א א GZIP א א א א.gzip א א KFileInputStream א GZIPOutputStream GZipInputStream א GZIP K א א FileOutputStream א א 7.11 א א א א File א Java א א א א א K א א א File א א א 1.11 א אKFile

12 الجزء الثاني: منصة العمل 138 الجدول 1.11 الطراي ق المستخدمة بشكل شاي ع في الصف.File الطريقة الوصف تحذف ملفا أو مجلدا. delete() تتحقق من وجود ملف. exists() تفهرس محتويات مجلد. list() تنشي مجلدا. mkdir() تغير اسم ملف. renameto(file f) א File א א א K א א File א א א א File א אW File roster = new File("Roster.txt"); א א א א File א אW File rosterdir = new File("/usr/rosters"); File roster = new File(rosterDir, "Roster.txt"); seek() א א א RandomAccessFile א RandomAccessFile א א א א RandomAccessFile א א "rw" "r"

13 139 الفصل الحادي عشر : عمليات الا دخال والا خراج الا ساسية א א א א א א אK File team = new File("Team.txt"); RandomAccessFile raf = new RandomAccessFile(team, "rw"); raf.seek(10); byte data = raf.readbyte();