Admin: 1 версия

2010-06-01T05:19:28Z

1 версия

в 17:44, 31 мая 2010

2010-05-31T17:44:27Z

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== BufferedInputStream ==

<p>For faster reading you should use BufferedInputStream to wrap any InputStream.
BufferedInputStream has two constructors that accept an InputStream:</p>



<source lang="java">
public BufferedInputStream(InputStream in)
public BufferedInput Stream (Input Stream in, int bufferSize)</source>



<p>Then, instead of calling the methods on fis, work with the BufferedInputStream bis.</p>

== Buffered Stream Copier ==



<source lang="java">
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
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 {
BufferedInputStream bin = new BufferedInputStream(in);
BufferedOutputStream bout = new BufferedOutputStream(out);
while (true) {
int datum = bin.read();
if (datum == -1)
break;
bout.write(datum);
}
bout.flush();
}
}</source>



== Import a file of exported preference data. ==



<source lang="java">
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.InputStream;
import java.util.prefs.Preferences;
public class Main {
public static void main(String[] argv) throws Exception {
// Create an input stream on a file
InputStream is = new BufferedInputStream(new FileInputStream("output.xml"));
// Import preference data
Preferences.importPreferences(is);
}
}</source>



== Read File in String Using Java BufferedInputStream Example ==



<source lang="java">
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
public class Main {
public static void main(String[] args) throws Exception {
File file = new File("C:/ReadFile.txt");
FileInputStream fin = new FileInputStream(file);
BufferedInputStream bin = new BufferedInputStream(fin);
byte[] contents = new byte[1024];
int bytesRead = 0;
String strFileContents;
while ((bytesRead = bin.read(contents)) != -1) {
strFileContents = new String(contents, 0, bytesRead);
System.out.print(strFileContents);
}
bin.close();
}
}</source>



== Read File Using Java BufferedInputStream Example ==



<source lang="java">
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
public class Main {
public static void main(String[] args) throws Exception {
File file = new File("C:/ReadFile.txt");
FileInputStream fin = new FileInputStream(file);
BufferedInputStream bin = new BufferedInputStream(fin);
while (bin.available() > 0) {
System.out.println((char) bin.read());
}
bin.close();
}
}</source>



== Read from file with BufferedInputStream ==



<source lang="java">
import java.io.BufferedInputStream;
import java.io.FileInputStream;
public class Main {
public static void main(String[] args) throws Exception {
byte[] buffer = new byte[1024];
BufferedInputStream bufferedInput = new BufferedInputStream(new FileInputStream("filename.txt"));
int bytesRead = 0;
while ((bytesRead = bufferedInput.read(buffer)) != -1) {
String chunk = new String(buffer, 0, bytesRead);
System.out.print(chunk);
}
bufferedInput.close();
}
}</source>



== Save keyboard input with BufferedInputStream ==



<source lang="java">
import java.io.BufferedInputStream;
import java.io.IOException;
public class ConsoleInput {
public static String readLine() {
StringBuffer response = new StringBuffer();
try {
BufferedInputStream buff = new BufferedInputStream(System.in);
int in = 0;
char inChar;
do {
in = buff.read();
inChar = (char) in;
if ((in != -1) & (in != "\n") & (in != "\r")) {
response.append(inChar);
}
} while ((in != -1) & (inChar != "\n") & (in != "\r"));
buff.close();
return response.toString();
} catch (IOException e) {
System.out.println("Exception: " + e.getMessage());
return null;
}
}
public static void main(String[] arguments) {
System.out.print("\nWhat is your name? ");
String input = ConsoleInput.readLine();
System.out.println("\nHello, " + input);
}
}</source>



== Use buffered streams to copy a file ==



<source lang="java">
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
public class Main {
public static void main(String[] argv) throws Exception {
BufferedInputStream fin = new BufferedInputStream(new FileInputStream("in.dat"));
BufferedOutputStream fout = new BufferedOutputStream(new FileOutputStream("out.dat"));
int i;
do {
i = fin.read();
if (i != -1)
fout.write(i);
} while (i != -1);
fin.close();
fout.close();
}
}</source>

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Admin: 1 версия

в 17:44, 31 мая 2010