Java by API/java.io/FileInputStream

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>