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7.1 /7.1.1//(stream)/() ( )

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7.1.2/java.io60InputStreamOutputStreamRandomAccessFileJava 1.1ReaderWriter

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1InputStreamOutputStream(1)InputStreamInputStreamJavaInputStream InputStreamInputStreamread()available()skip()reset()mark()

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(2)OutputStreamOutputStreamJavaOutputStreamOutputStreamOutputStreamwrite()close()InputStreamOutputStreamFilterInputStreamFilterOutputStreamDataInputStreamDataOutputStream

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DataInputStreamreadByte()readBoolean()readShort()readChar()readInt()readLong()readFloat()readDouble()readLine()DataOutputStreamwriteByte()writeBoolean()writeShort()writeChar()writeInt()writeLong()writeFloat()writeDouble()writeChars()

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2ReaderWriter(1)ReaderReaderJavaReaderread() (2)WriterWriterJavaWriterwrite()

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7.1.3 JavaSystemSystemObjectinouterr

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(1)Systemin public static final InputStream inInputStream read()skip(long n)read()skip(long n)n(2)Systemoutpublic static final PrintStream out

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PrintStream print()println()Java(3)Systemerr public static final PrintStream errSystem.outPrintStream

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7.1import java.util.Scanner;class MyType{ public static void main(String args[]){ int count = 0; String b = ""; Scanner sc = new Scanner(System.in); System.out.println(""); while(sc.hasNext()){ b=sc.next(); System.out.print(b);

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count+=b.length(); } System.out.println(); // System.err.println("\n"+count+""); // }} +

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7.2 (1)java.ioimport java.io.*;(2)(3)(4)(5)(2)(5)

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7.2.1 InputStreamOutputStreamInputStreamOutputStreamInputStreamOutputStream1.FileInputStream FileOutputStreamFileInputStream FileOutputStreamInputStreamOutputStream(1)FileInputStreamFileInputStream

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FileInputStreamFileInputStream(String name) nameFileInputStream fis = new FileInputStream ("c:/config.sys"); FileInputStream(File file)fileFile myFile = new File("c:/config.sys"); FileInputSteam fis = new FileInputStream(myFile); FileInputStreamFileNotFoundException

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(2)FileInputStreamread()int read()-1int read(byte b[])b-1int read(byte b[],int off, int len)b[off]-1(3)FileOutputStreamFileOutputStream

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FileOutputStreamFileOutputStreamFileOutputStreamFileOutputStream(String name) nameFileOutputStream fos = new FileOutputStream("d:/out.dat"); FileOutputStream(File file) fileFile myFile = new File("d:/out.dat"); FileOutputStream fos = new FileOutputStream(myFile);

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(4)FileOutputStreamwrite()void write(int b)void write(byte b[])b void write(byte b[],int off,int len)bofflen(5)FileInputStreamJavaclose() fos.close();

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7.2//java CopyFile import java.io.*;class CopyFile { public static void main(String args[])throws IOException{ int i; FileInputStream fin; FileOutputStream fout; try { try { fin = new FileInputStream(args[0]); } catch(FileNotFoundException e) { System.out.println(""); return; }

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try { // fout = new FileOutputStream(args[1]); } catch(FileNotFoundException e) { System.out.println(""); return; } } catch(ArrayIndexOutOfBoundsException e) { System.out.println(: CopyFile "); return; } try { // while((i = fin.read())!= -1) fout.write(i); } catch(IOException e) { System.out.println(""); }

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fin.close(); fout.close(); }}7.3//java ShowFile TEST.TXTimport java.io.*;class ShowFile { public static void main(String args[])throws IOException{ int i; FileInputStream fin = null; try { fin = new FileInputStream(args[0]); } catch(FileNotFoundException e) {

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System.out.println(""); System.exit(-1); } catch(ArrayIndexOutOfBoundsException e) { System.out.println( : java ShowFile "); System.exit(-2); } // EOF while(( i = fin.read()) != -1) System.out.print((char) i); fin.close(); }}

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2.DataInputStream DataOutputStreamFileInputStream FileOutputStream//DataInputStream DataOutputStream(1);(2);(3)/

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DataInputStreamDataInputStream(InputStream in)FilterInputStreamInputStreaminDataOutputStreamDataOutputStream(OutputStream out)OutputStream 7.4CFIB.DATFibonacci20Fibonacci11,1,2,3,5,8,13,21,.import java.io.*;class FibOut {

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public static void main(String args[]) { try { // OutputStream fos = new FileOutputStream("c:/fib.dat"); DataOutputStream dos = new DataOutputStream(fos); int count = 0,i = 1,j = 1; for(;count < 20; count++){ dos.writeInt(i); int k = i + j; i = j; j = k; } fos.close(); // } catch(Exception e) {

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System.out.println("Exception: " + e); } System.out.println(""); }}CFIB.DATTYPE7.57.57.4Fibonacciimport java.io.*;class FibIn {

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public static void main(String args[]) { try { FileInputStream fis = new FileInputStream("c:/fib.dat"); // DataInputStream dis = new DataInputStream(fis); // for(int i = 0; i < 20; i++){ // if(i % 10 == 0)System.out.println(); System.out.printf(%5d,dis.readInt()); } fis.close(); // } catch(Exception e) { System.out.println("Exception: " + e); } System.out.println(); } }

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1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987 1597 2584 4181 67653.BufferedInputStreamBufferedOutputStream BufferedOutputStreamFileOutputStreamflush()

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BufferedInputStream(1)BufferedOutputStreamBufferedOutputStreamFileOutputStreamBufferedOutputStream BufferedOutputStream(OutputStream out)512BufferedOutputStream(OutputStream out, int size)size

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bosFileOutputStream fos = new FileOutputStream("/user/dbf/stock.dbf"); BufferedOutputStream bos = new BufferedOutputStream(fos); (2)flush()flush()flush() public void flush() throws IOException bos.flush();

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(3)BufferedInputStreamBufferedInputStreamBufferedInputStream(InputStream in) BufferedInputStreamInputStreaminBufferedInputStream(InputStream in, int size) sizeBufferedInputStreamInputStreamin(4)7.5FileInputStream fis = new FileInputStream("c:/fib.dat");

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BufferedInputStream bis = new BufferedInputStream(fis);DataInputStream dis = new DataInputStream(bis); 4.PrintStreamPrintStreamJavaprint()println()PrintStreamOutputStreamPrintStreampublic PrintStream(OutputStream out)

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public PrintStream(OutputStream out,boolean autoFlush)autoFlushtrueprintln()newline('\n') 7.6PrintStreamimport java.io.*;import java.awt.*;public class PrintStreamDemo{ public static void main(String args[]) throws IOException{ FileOutputStream fos = new FileOutputStream("PrintStream"); PrintStream ps = new PrintStream(fos); Button b1 = new Button("Button");

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ps.println(123); ps.println(3.1415926); ps.println("123"+456); ps.println(123==123.0); ps.println(b1); ps.close(); fos.close(); }} printstream1233.1415926123456truejava.awt.Button[button0,0,0,0x0,invalid,label=Button]

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7.2.2 ReaderWriterJava16Unicode/Java1.1ReaderWriterInputStreamOuputStreamReaderWriterIO

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1.InputSteamReaderOutputStreamWriterjava.ioInputSteamReaderOutputStreamWriterpublic InputSteamReader(InputSteam in)public InputSteamReader(InputSteam in,String enc)public OutputStreamWriter(OutputStream out)public OutputStreamWriter(OutputStream out,String enc)

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inoutencgetEncoding()read()write()close()ReaderWriter2.FileReaderFileWriterFileReaderFileWriterInputSteamReaderOutputStreamWriter/FileReaderFileReader(File file)fileFileReader

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FileReader(String fileName) fileNameFileReaderFileWriterFileWriter(File file) fileFileWriterFileWriter(String fileName) fileNameFileWriterappendappendtrueFileReaderread()read(char[] buffer)FileWriterwrite(String str)Write(char[] buffer)write(int char)flush()close()flushgetEncoding()

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7.7FileWriterimport java.io.*;class FileWriterDemo { public static void main(String args[]){ FileWriter out = null; try{ out = new FileWriter("FileWrite.txt"); System.out.println("Encoding:" + out.getEncoding()); out.write("Java Programming."); out.close(); }catch(IOException e){} }}Encoding:GBK

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>type filewriter.txt Java Programming.3.BufferedReaderBufferedWriterBufferedReaderBufferedWriterpublic BufferedReader(Reader in)public BufferedReader(Reader in,int sz)public BufferedWriter(Writer out)public BufferedWriter(Writer out,int sz)inoutsz

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BufferedReaderBufferedWriterReaderWriterreadLine()newLine()line.separator7.8FileWriterBufferedWriterwrite()import java.io.*;class BufferedWriterDemo { public static void main(String args[]) { try { FileWriter fw = new FileWriter(args[0]); BufferedWriter bw = new BufferedWriter(fw);

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for(int i = 0; i < 10; i++) { // bw.write("Line " + i + "\n\r"); } bw.close(); // }catch(Exception e) { System.out.println("Exception: " + e); } }}java BufferedWriterDemo p7-8.txt // p7-8.txtp7-8.txttypeLine 0Line 910

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7.9FileReaderBufferedReaderreadLine()import java.io.*;class BufferedReaderDemo { public static void main(String args[]) { try { FileReader fr = new FileReader(args[0]); BufferedReader br = new BufferedReader(fr); String s; while((s = br.readLine()) != null) System.out.println(s); fr.close(); } catch(Exception e) { System.out.println("Exception: " + e);} }}

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4.PrintWriterPrintWriterprint()println()JavaPrintWriterPrintWriter(OutputStream out)PrintWriter(OutputStream out, boolean autoFlush)PrintWriter(Writer out)PrintWriter(Writer out, boolean autoFlush)test.txtPrintWriterpw PrintWriter pw = new PrintWriter(new FileOutputStream("test.txt"));

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:PrintWriter pw=new PrintWriter(new FileWriter("test.txt"));7.10import java.io.*;public class ReadKey{ public static void main(String args[]){ File f = new File(args[0]); try{ BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); PrintWriter pw = new PrintWriter(new FileWriter(f)); String s; System.out.println( "(Ctrl+z)"); while((s = br.readLine())!=null)pw.println(s);

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br.close(); pw.close(); }catch(IOException e){ e.printStackTrace(); } }}

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7.3 JavaRandomAccessFileRandomAccessFileObjectDataInputDataOutputDataInputStreamDataOutputStream1.RandomAccessFileRandomAccessFileRandomAccessFile(File file, String mode)RandomAccessFile(String name, String mode)

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namefileFilemoderrwmoderIOExceptionmoderwnameIOExceptionRandomAccessFile rf = new RandomAccessFile ("/usr/db/stock.dbf", "rw"); 2.RandomAccessFileDataInput/DataOutputDataInputStreamDataOutputStreamread()write()

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3.public long getFilePointer()throws IOExceptionpublic void seek(long pos) throws IOException pospos0rf rf.seek(rf.length());public long length()throws IOException"length()"public int skipBytes(int n)throws IOExceptionn

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4."rw" rf = new RandomAccessFile("c:/config.sys","rw"); rf.seek(rf.length());7.11import java.io.*;public class RandomIODemo { public static void main(String args[]) throws IOException { RandomAccessFile rf = new RandomAccessFile("random.txt","rw"); rf.writeBoolean(true); rf.writeInt(123456); rf.writeChar('j'); rf.writeDouble(1234.56);

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rf.seek(1); System.out.println(rf.readInt()); System.out.println(rf.readChar()); System.out.println(rf.readDouble()); rf.seek(0); System.out.println(rf.readBoolean()); rf.close(); }} 123456 j 1234.56 true

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7.12nnimport java.io.*;class RandomIODemo2{ public static void main(String args[]) { try { RandomAccessFile rf = new RandomAccessFile(args[0], "r"); long count = Long.valueOf(args[1]).longValue(); long position = rf.length(); position -= count; if(position < 0) position = 0; rf.seek(position); while(true) { try {

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byte b = rf.readByte(); System.out.print((char)b); }catch(EOFException eofe) { break; } } }catch(Exception e) { e.printStackTrace(); } }} :java RandomIODemo2 RandomIODemo2.java 50RandomIODemo2.java50

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7.4 java.ioFileJavaJavaFileObject

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7.4.1 public boolean mkdir() public String[] list() 7.4.2 JaveFileFile1FileFileFile

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File(String pathname)File(File parent, String child)File(String parent, String child) 2

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(1)public String getName() public String getParent() public String getPath() public String getAbsolutePath() (2)public boolean renameTo(File dest) (3)public boolean delete()

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(4)public boolean exists() public boolean canWrite() public boolean canRead() public boolean isFile() public boolean isDirectory() public boolean isAbsolute()(5)public long lastModified() public long length()

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7.13import java.io.*;public class FileInfo{ public static void main(String args[]) throws IOException{ File fileToCheck; if(args.length > 0){ for(int i = 0;i