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There are 50 classes in java.io, and we will describe only a few here. To read a file of character data, one would use a BufferedReader wrapped around a FileReader. The Java I/O design is very flexible, and this is a good example of that. A FileReader reads characters from a file, and by wrapping the FileReader with a BufferedReader, the I/O will be accomplished more efficiently by reading a group of characters at once. The BufferedReader also provides a method called readLine(), which allows the program to read a whole line at a time from a file into a String variable. Without the BufferedReader, a FileReader only has methods to read characters. Here is a little program to read a file of character data and display it on the screen: import java.io.*; /** * A program that opens a character based file, * specified on the command line, * and shows its contents on standard output. * * @author Carl Reynolds */ public class ShowFile { public static void main( String args[] ) { BufferedReader in = null; String line; // Make sure the number of arguments is correct if ( args.length != 1) { System.err.println( "Usage: ShowFile sourceFile" ); System.exit(1); } // Attempt to open the file for reading try { in = new BufferedReader( new FileReader( args[0] ) ); } catch ( FileNotFoundException e ) { System.err.println( "ShowFile: " + e.getMessage() ); System.exit( 1 ); } // Read and display try { while ( (line = in.readLine() ) != null ) { System.out.println( line ); } } catch ( IOException e ) { System.err.println( "ShowFile: " + e.getMessage() ); System.exit( 1 ); } finally { // Close the file try{ in.close(); } catch( Exception e ) {} } }//main } //ShowFile
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This program checks the command line arguments in the array of Strings called args to make sure that the user provided a parameter for the file name. If the user provided exactly one argument, the program assumes this argument is the name of a file, and it attempts to open the file using a BufferedReader inside a try block. If all goes well, the program enters a while loop calling the readLine() method of the BufferedReader to read a line of the file at a time into the String variable line, and then display the text using the println() method. The loop will terminate when readLine() returns a null value; that is the signal that the BufferedReader has encountered the end-of-file (EOF). The program uses the finally block to close the file. Since the close() method can itself throw an IOException, the call to close() within the finally block must also be surrounded by a try block. If an error occurs here, however, this program simply ignores it; the catch block is empty of any code. Our second example reads a file for the simple purpose of copying the bits in the file to a new file. For this purpose we use a BufferedInputStream wrapped around a FileInputStream. The program copies the bits literally, one byte at a time. This approach is highly efficient because there is no overhead of translating the bit patterns into characters. import java.io.*; /** * Copy files from the command line. * @author Paul Tymann * @author Carl Reynolds */ public class FileCopy { public static void main( String args[] ) { BufferedInputStream in = null; BufferedOutputStream out = null; int data; // Check command line arguments if ( args.length != 2 ) { System.out.println( "Usage: FileCopy sourceFile destFile"); System.exit(1); } try { // Open the input file. in = new BufferedInputStream( new FileInputStream( args[0]) ); // Open the output file. // If the output file exists, it will be overwritten. out = new BufferedOutputStream( new FileOutputStream( args[1] ) ); } catch ( FileNotFoundException e ) { System.err.println("FileCopy: " + e.getMessage() ); System.exit( 1 ); } // Now copy the files one byte at a time try { while ( (data = in.read() ) != -1) { out.write( data ); } }
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