FileDumper Class in java

FileDumper Class in java

import java.io.*; import com.elharo.io.*;  public class FileDumper {    public static final int ASC = 0;   public static final int DEC = 1;   public static final int HEX = 2;    public static void main(String[] args) {      if (args.length < 1) {       System.err.println("Usage: java FileDumper [-ahd] file1 file2...");       return;     }      int firstArg = 0;     int mode = ASC;      if (args[0].startsWith("-")) {       firstArg = 1;       if (args[0].equals("-h")) mode = HEX;       else if (args[0].equals("-d")) mode = DEC;     }      for (int i = firstArg; i < args.length; i++) {       try {         if (mode == ASC) dumpAscii(args[i]);         else if (mode == HEX) dumpHex(args[i]);         else if (mode == DEC) dumpDecimal(args[i]);          }         catch (IOException ex) {         System.err.println("Error reading from " + args[i] + ": "           + ex.getMessage());       }        if (i < args.length-1) {  // more files to dump         System.out.println("\r\n--------------------------------------\r\n");       }     }   }    public static void dumpAscii(String filename) throws IOException {      FileInputStream fin = null;     try {       fin = new FileInputStream(filename);       StreamCopier.copy(fin, System.out);     }     finally {       if (fin != null) fin.close();     }   }    public static void dumpDecimal(String filename) throws IOException {      FileInputStream fin = null;     byte[] buffer = new byte[16];     boolean end = false;      try {       fin = new FileInputStream(filename);       while (!end) {         int bytesRead = 0;         while (bytesRead < buffer.length) {           int r = fin.read(buffer, bytesRead, buffer.length - bytesRead);           if (r == -1) {             end = true;             break;           }           bytesRead += r;         }         for (int i = 0; i < bytesRead; i++) {           int dec = buffer[i];           if (dec < 0) dec = 256 + dec;           if (dec < 10) System.out.print("00" + dec + " ");           else if (dec < 100) System.out.print("0" + dec + " ");           else System.out.print(dec + " ");         }         System.out.println();       }     }     finally {       if (fin != null) fin.close();     }   }    public static void dumpHex(String filename) throws IOException {      FileInputStream fin = null;     byte[] buffer = new byte[24];     boolean end = false;      try {       fin = new FileInputStream(filename);       while (!end) {         int bytesRead = 0;         while (bytesRead < buffer.length) {           int r = fin.read(buffer, bytesRead, buffer.length - bytesRead);           if (r == -1) {             end = true;             break;           }           bytesRead += r;         }         for (int i = 0; i < bytesRead; i++) {           int hex = buffer[i];           if (hex < 0) hex = 256 + hex;           if (hex >= 16) System.out.print(Integer.toHexString(hex) + " ");           else System.out.print("0" + Integer.toHexString(hex) + " ");         }         System.out.println();       }     }     finally {       if (fin != null) fin.close();     }   } }

FileCopier Class in java

FileCopier Class in java

import java.io.*; import com.elharo.io.*;  public class FileCopier {    public static void main(String[] args) {      if (args.length != 2) {       System.err.println("Usage: java FileCopier infile outfile");     }     try {       copy(args[0], args[1]);     }     catch (IOException ex) {       System.err.println(ex);     }   }    public static void copy(String inFile, String outFile)     throws IOException {      FileInputStream  fin = null;     FileOutputStream fout = null;          try {       fin  = new FileInputStream(inFile);       fout = new FileOutputStream(outFile);       StreamCopier.copy(fin, fout);     }     finally {       try {         if (fin != null) fin.close();       }       catch (IOException ex) {       }       try {         if (fout != null) fout.close();        }       catch (IOException ex) { }     }   } }

FileTyper class in java

FileTyper class in java

import java.io.*; import com.elharo.io.*;  public class FileTyper {    public static void main(String[] args) throws IOException {     if (args.length != 1) {       System.err.println("Usage: java FileTyper filename");       return;     }     typeFile(args[0]);   }    public static void typeFile(String filename) throws IOException {     FileInputStream fin = new FileInputStream(filename);     try {         StreamCopier.copy(fin, System.out);     }     finally {       fin.close();     }   } }

Program using NullOutputStream Class in java

Program using NullOutputStream Class in java

package com.elharo.io;

import java.io.*;

public class NullOutputStream extends OutputStream {

private boolean closed = false;

public void write(int b) throws IOException {
if (closed) throw new IOException("Write to closed stream");
}

public void write(byte[] data, int offset, int length)
throws IOException {
if (data == null) throw new NullPointerException("data is null");
if (closed) throw new IOException("Write to closed stream");
}

public void close() {
closed = true;
}
}

Java Program to show AsciiArray class

Java Program to show AsciiArray class

import java.io.*;

public class AsciiArray {

public static void main(String[] args) {

byte[] b = new byte[(127-31)*2];
int index = 0;
for (int i = 32; i < 127; i++) {
b[index++] = (byte) i;
// Break line after every eight characters.
if (i % 8 == 7) b[index++] = (byte) '\n';
else b[index++] = (byte) '\t';
}
b[index++] = (byte) '\n';
try {
System.out.write(b);
}
catch (IOException ex) {
System.err.println(ex);
}
}
}

StreamCopier class in Java

StreamCopier class in Java

package com.elharo.io;

import java.io.*;

public class StreamCopier {

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 {

byte[] buffer = new byte[1024];
while (true) {
int bytesRead = in.read(buffer);
if (bytesRead == -1) break;
out.write(buffer, 0, bytesRead);
}

}

}

Program for RandomInputStream Class in Java

Program for RandomInputStream Class in Java

package com.elharo.io;

import java.util.*;
import java.io.*;

public class RandomInputStream extends InputStream {

private Random generator = new Random();
private boolean closed = false;

public int read() throws IOException {
checkOpen();
int result = generator.nextInt() % 256;
if (result < 0) result = -result;
return result;
}

public int read(byte[] data, int offset, int length) throws IOException {
checkOpen();
byte[] temp = new byte[length];
generator.nextBytes(temp);
System.arraycopy(temp, 0, data, offset, length);
return length;

}

public int read(byte[] data) throws IOException {
checkOpen();
generator.nextBytes(data);
return data.length;

}

public long skip(long bytesToSkip) throws IOException {
checkOpen();
// It's all random so skipping has no effect.
return bytesToSkip;
}

public void close() {
this.closed = true;
}

private void checkOpen() throws IOException {
if (closed) throw new IOException("Input stream closed");
}

public int available() {
// Limited only by available memory and the size of an array.
return Integer.MAX_VALUE;
}
}

StreamPrinter Class in Java

StreamPrinter Class in Java

import java.io.*;

public class StreamPrinter {

public static void main(String[] args) {

try {
while (true) {
int datum = System.in.read();
if (datum == -1) break;
System.out.println(datum);
}
}
catch (IOException ex) {
System.err.println("Couldn't read from System.in!");
}
}
}

Program to Print ASCII values in Java

Program to Print ASCII values in Java



import java.io.*;

public class AsciiChart
{

public static void main(String[] args) {

for (int i = 32; i < 127; i++) {
System.out.write(i);
// break line after every eight characters.
if (i % 8 == 7) System.out.write('\n');
else System.out.write('\t');
}
System.out.write('\n');
}
}