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To read bytes from a file using FileInputStream involves these steps: 1 Open the file by creating a FileInputStream instance 2 Read from the file by using the read( ) method 3 Close the file by calling close( )
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To open a file for input, create a FileInputStream object FileInputStream defines three constructors The one we will use is: FileInputStream(String leName) throws FileNotFoundException Here, fileName specifies the name of the file that you want to open If the file does not exist, then FileNotFoundException is thrown To read from the file, you can use any version of the read( ) method (which is inherited from InputStream) The one that we will use is shown here: int read( ) throws IOException It reads a single byte from the file and returns the byte as an integer value read( ) returns 1 when the end of the file is encountered It will throw an IOException if an I/O error occurs Other versions of read( ) can input multiple bytes at a time and put them into an array
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When you are done with the file, you must close it by calling close( ) It is shown here: void close( ) throws IOException An IOException is thrown if an error occurs when closing the file
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The following program uses FileInputStream to display the contents of a file, byte by byte, in hexadecimal format
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// // // // // // // // // Display a file in hex To use this program, specify the name of the file that you want to see For example, to see a file called testexe, use the following command line: java HexDump testexe
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import javaio*; class HexDump { public static void main(String args[]) { FileInputStream fin; // First make sure that a file has been specified // on the command line if(argslength != 1) { Systemoutprintln("Usage: java HexDump File"); return; } // Now, open the file try { fin = new FileInputStream(args[0]); } catch(FileNotFoundException exc) { Systemoutprintln("File Not Found"); return; } // Read bytes and display their hexadecimal values try { int i; int count = 0; // Read bytes until EOF is encountered do { i = finread(); if(i != -1) Systemoutprintf("%02X ", i); count++;
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3:
File Handling
if(count == 16) { Systemoutprintln(); count = 0; } } while(i != -1); } catch(IOException exc) { Systemoutprintln("Error Reading File"); } // Close the file try { finclose(); } catch(IOException exc) { Systemoutprintln("Error Closing File"); } } }
Here is a portion of the output produced when this program is run on its own class file
CA 00 00 00 00 00 03 6E FE 1D 05 27 20 30 28 65 BA 00 00 07 00 07 29 4E BE 1E 23 00 2C 00 56 75 00 08 07 28 07 31 01 6D 00 00 00 0A 00 01 00 62 00 1F 24 00 2D 00 04 65 31 0A 08 29 08 06 43 72 00 00 00 00 00 3C 6F 54 40 20 25 2A 2E 69 64 61 0A 00 0A 0A 0A 6E 65 62 00 21 00 00 00 69 01 6C 0B 07 05 20 05 74 00 65 00 00 00 00 00 3E 0F 01 1C 22 26 2B 2F 01 4C 00 09 0A 08 0A 08 00 69 04
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There are two other forms of read( ) that you can use to read bytes from a file First, you can read a block of bytes from the file by using this form of read( ): int read(byte buf[ ]) throws IOException It fills the array referred to by buf with bytes read from the file It returns the number of bytes actually read, which might be less than buflength if the end of the file is encountered Attempting to read at end-of-file causes read( ) to return 1 For example, in the preceding program, here is another way to write the sequence that reads and displays the bytes in the file:
// Read bytes and display their hexadecimal values try { int len; byte data[] = new byte[16]; // Read bytes until EOF is encountered do { len = finread(data); for(int j=0; j<len; j++) Systemoutprintf("%02X ", data[j]);
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