Admin: 1 версия

2010-06-01T05:19:38Z

1 версия

в 17:44, 31 мая 2010

2010-05-31T17:44:27Z

Новая страница

== File copier ==



<source lang="java">
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
public class MainClass {
public static void main(String[] args) {
if (args.length != 2) {
System.err.println("Usage: java MainClass infile outfile");
}
try {
copy(args[0], args[1]);
} catch (IOException ex) {
System.err.println(ex);
}
}
public static void copy(String inFile, String outFile) throws IOException {
FileInputStream fin = null;
FileOutputStream fout = null;
try {
fin = new FileInputStream(inFile);
fout = new FileOutputStream(outFile);
copy(fin, fout);
} finally {
try {
if (fin != null)
fin.close();
} catch (IOException ex) {
}
try {
if (fout != null)
fout.close();
} catch (IOException ex) {
}
}
}
public static void copy(InputStream in, OutputStream out) throws IOException {
byte[] buffer = new byte[1024];
while (true) {
int bytesRead = in.read(buffer);
if (bytesRead == -1)
break;
out.write(buffer, 0, bytesRead);
}
}
}</source>



== File typer ==



<source lang="java">
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
public class MainClass {
public static void main(String[] args) throws IOException {
if (args.length != 1) {
System.err.println("Usage: java FileTyper filename");
return;
}
typeFile(args[0]);
}
public static void typeFile(String filename) throws IOException {
FileInputStream fin = new FileInputStream(filename);
try {
copy(fin, System.out);
} finally {
fin.close();
}
}
public static void copy(InputStream in, OutputStream out) throws IOException {
byte[] buffer = new byte[1024];
while (true) {
int bytesRead = in.read(buffer);
if (bytesRead == -1)
break;
out.write(buffer, 0, bytesRead);
}
}
}</source>



== Open Stream from URL ==



<source lang="java">
import java.net.*;
import java.io.*;
public class MainClass {
public static void main(String[] args) throws IOException {
InputStream in = null;
try {
URL u = new URL("http://www.jexp.ru");
in = u.openStream();
for (int c = in.read(); c != -1; c = in.read()) {
System.out.write(c);
}
in.close();
}
catch (MalformedURLException ex) {
System.err.println("not a URL Java understands.");
}
finally {
if (in != null) in.close();
}
}
}</source>



== Stream Copier ==



<source lang="java">
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
public class MainClass {
public static void main(String[] args) {
try {
copy(System.in, System.out);
} catch (IOException ex) {
System.err.println(ex);
}
}
public static void copy(InputStream in, OutputStream out) throws IOException {
byte[] buffer = new byte[1024];
while (true) {
int bytesRead = in.read(buffer);
if (bytesRead == -1)
break;
out.write(buffer, 0, bytesRead);
}
}
}</source>



== Understanding Streams ==

<OL><LI>A stream "is" a sequence of bytes</LI><LI>When writing data to a stream, the stream is called an output stream.</LI><LI>When reading data from a stream, the stream is called an input stream.</LI><LI>If a stream has a buffer in memory, it is a buffered stream.</LI><LI>Binary Streams contain binary data.</LI><LI>Character Streams have character data and are used for storing and retrieving text</LI></OL>
ClassDescriptionInputStreamThe base class for byte stream input operations.OutputStreamThe base class for byte stream output operations.BufferedInputStreamBuffers input from another stream in memory to make the read operations more efficient.

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Java Tutorial/File/Stream - История изменений

Admin: 1 версия

в 17:44, 31 мая 2010