в 17:43, 31 мая 2010

2010-05-31T17:43:48Z

Admin: 1 версия

2010-05-31T14:32:18Z

1 версия

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== FileInputStream: available() ==



<source lang="java">

import java.io.FileInputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.Statement;
public class Main {
public static void main(String[] args) throws Exception {
try {
String url = "jdbc:odbc:databaseName";
String driver = "sun.jdbc.odbc.JdbcOdbcDriver";
String user = "guest";
String password = "guest";
FileInputStream fis = new FileInputStream("somefile.txt");
Class.forName(driver);
Connection connection = DriverManager.getConnection(url, user, password);
Statement createTable = connection.createStatement();
createTable.executeUpdate("CREATE TABLE source_code (name CHAR(20), source LONGTEXT)");
String ins = "INSERT INTO source_code VALUES(?,?)";
PreparedStatement statement = connection.prepareStatement(ins);
statement.setString(1, "TryInputStream"); // Set first field
statement.setAsciiStream(2, fis, fis.available()); // Stream is source
int rowsUpdated = statement.executeUpdate();
System.out.println("Rows affected: " + rowsUpdated);
connection.close();
} catch (Exception e) {
System.err.println(e);
}
}
}

</source>



== FileInputStream: close() ==



<source lang="java">

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
public class Main {
public static void main(String[] args) {
boolean areFilesIdentical = true;
File file1 = new File("c:\\file1.txt");
File file2 = new File("c:\\file2.txt");
if (!file1.exists() || !file2.exists()) {
System.out.println("One or both files do not exist");
System.out.println(false);
}
System.out.println("length:" + file1.length());
if (file1.length() != file2.length()) {
System.out.println("lengths not equal");
System.out.println(false);
}
try {
FileInputStream fis1 = new FileInputStream(file1);
FileInputStream fis2 = new FileInputStream(file2);
int i1 = fis1.read();
int i2 = fis2.read();
while (i1 != -1) {
if (i1 != i2) {
areFilesIdentical = false;
break;
}
i1 = fis1.read();
i2 = fis2.read();
}
fis1.close();
fis2.close();
} catch (IOException e) {
System.out.println("IO exception");
areFilesIdentical = false;
}
System.out.println(areFilesIdentical);
}
}

</source>



== FileInputStream: getChannel() ==



<source lang="java">

import java.io.FileInputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
public class MainClass {
public static void main(String args[]) {
FileInputStream fIn;
FileChannel fChan;
long fSize;
ByteBuffer mBuf;
try {
fIn = new FileInputStream("test.txt");
fChan = fIn.getChannel();
fSize = fChan.size();
mBuf = ByteBuffer.allocate((int) fSize);
fChan.read(mBuf);
mBuf.rewind();
for (int i = 0; i < fSize; i++)
System.out.print((char) mBuf.get());
fChan.close();
fIn.close();
} catch (IOException exc) {
System.out.println(exc);
}
}
}

</source>



== FileInputStream: getFD() ==



<source lang="java">

import java.io.File;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.IOException;
public class Main {
public static void main(String[] a) {
File aFile = new File("C:/myFile.text");
FileInputStream inputFile1 = null;
FileDescriptor fd = null;
try {
inputFile1 = new FileInputStream(aFile);
fd = inputFile1.getFD();
} catch (IOException e) {
e.printStackTrace(System.err);
System.exit(1);
}
FileInputStream inputFile2 = new FileInputStream(fd);
}
}

</source>



== FileInputStream: read() ==



<source lang="java">

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
public class Main {
public static void main(String[] args) {
boolean areFilesIdentical = true;
File file1 = new File("c:\\file1.txt");
File file2 = new File("c:\\file2.txt");
if (!file1.exists() || !file2.exists()) {
System.out.println("One or both files do not exist");
System.out.println(false);
}
System.out.println("length:" + file1.length());
if (file1.length() != file2.length()) {
System.out.println("lengths not equal");
System.out.println(false);
}
try {
FileInputStream fis1 = new FileInputStream(file1);
FileInputStream fis2 = new FileInputStream(file2);
int i1 = fis1.read();
int i2 = fis2.read();
while (i1 != -1) {
if (i1 != i2) {
areFilesIdentical = false;
break;
}
i1 = fis1.read();
i2 = fis2.read();
}
fis1.close();
fis2.close();
} catch (IOException e) {
System.out.println("IO exception");
areFilesIdentical = false;
}
System.out.println(areFilesIdentical);
}
}

</source>



== new FileInputStream(FileDescriptor fdObj) ==



<source lang="java">

import java.io.File;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.IOException;
public class Main {
public static void main(String[] a) {
File aFile = new File("C:/myFile.text");
FileInputStream inputFile1 = null;
FileDescriptor fd = null;
try {
inputFile1 = new FileInputStream(aFile);
fd = inputFile1.getFD();
} catch (IOException e) {
e.printStackTrace(System.err);
System.exit(1);
}
FileInputStream inputFile2 = new FileInputStream(fd);
}
}

</source>



== new FileInputStream(File file) ==



<source lang="java">

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
public class Main {
public static void main(String[] a) {
File aFile = new File("C:/myFile.txt");
FileInputStream inputFile = null;
try {
inputFile = new FileInputStream(aFile);
} catch (FileNotFoundException e) {
e.printStackTrace(System.err);
System.exit(1);
}
}
}

</source>



== new FileInputStream(String name) ==



<source lang="java">

/*
* Output:
*/
import java.io.DataInputStream;
import java.io.FileInputStream;
public class MainClass {
public static void main(String args[]) {
try {
FileInputStream fis = new FileInputStream("fileName.dat");
// Create a data input stream
DataInputStream dis = new DataInputStream(fis);
// Read and display data
System.out.println(dis.readBoolean());
System.out.println(dis.readByte());
System.out.println(dis.readChar());
System.out.println(dis.readDouble());
System.out.println(dis.readFloat());
System.out.println(dis.readInt());
System.out.println(dis.readLong());
System.out.println(dis.readShort());
// Close file input stream
fis.close();
} catch (Exception e) {
System.out.println("Exception: " + e);
}
}
}

</source>

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Java by API/java.io/FileInputStream - История изменений

в 17:43, 31 мая 2010

Admin: 1 версия