I have a .txt file consisting of 1's and 0's like so;
11111100000001010000000101110010
11111100000001100000000101110010
00000000101001100010000000100000
I would like to be able to read 8 (1's and 0's) and put each 'byte' into a byte array. So a line would be 4 bytes;
11111100 00000101 00000001 01110010 --> 4 bytes, line 1
11111100 00000110 00000001 01110010 --> 8 bytes, line 2
00000000 10100110 00100000 00100000 --> total 12 bytes, line 3
...
and so on.
I believe I need to store the data in a binary file but I'm not sure how to do this. Any help is greatly appreciated.
Edit 1:
I would like to put 8 1's and 0's (11111100, 00000101) into a byte and store in a byte array so 11111100 would be the first byte in the array, 00000101 the second and so on. I hope this is clearer.
Edit 2:
fileopen = new JFileChooser(System.getProperty("user.dir") + "/Example programs"); // open file from current directory
filter = new FileNameExtensionFilter(".txt", "txt");
fileopen.addChoosableFileFilter(filter);
if (fileopen.showOpenDialog(null)== JFileChooser.APPROVE_OPTION)
{
try
{
file = fileopen.getSelectedFile();
//create FileInputStream object
FileInputStream fin = new FileInputStream(file);
byte[] fileContent = new byte[(int)file.length()];
fin.read(fileContent);
for(int i = 0; i < fileContent.length; i++)
{
System.out.println("bit " + i + "= " + fileContent[i]);
}
//create string from byte array
String strFileContent = new String(fileContent);
System.out.println("File content : ");
System.out.println(strFileContent);
}
catch(FileNotFoundException e){}
catch(IOException e){}
}
Here's one way, with comments in the code:
import java.lang.*;
import java.io.*;
import java.util.*;
public class Mkt {
public static void main(String[] args) throws Exception {
BufferedReader br = new BufferedReader(new FileReader("in.txt"));
List<Byte> bytesList = new ArrayList<Byte>();
// Read line by line
for(String line = br.readLine(); line != null; line = br.readLine()) {
// 4 byte representations per line
for(int i = 0; i < 4; i++) {
// Get each of the 4 bytes (i.e. 8 characters representing the byte)
String part = line.substring(i * 8, (i + 1) * 8);
// Parse that into the binary representation
// Integer.parseInt is used as byte in Java is signed (-128 to 127)
byte currByte = (byte)Integer.parseInt(part, 2);
bytesList.add(currByte);
}
}
Byte[] byteArray = bytesList.toArray(new Byte[]{});
// Just print for test
for(byte currByte: byteArray) {
System.out.println(currByte);
}
}
}
Input is read from file named in.txt
. Here's a sample run:
$ javac Mkt.java && java Mkt
-4
5
1
114
-4
6
1
114
0
-90
32
32
Hope this helps to get you started, you can tweak to your needs.
Use BufferedReader to read in the txt file.
BufferedReader in = new BufferedReader(...);
ArrayList<byte> bytes = new ArrayList<byte>();
ArrayList<char> buffer = new ArrayList<char>();
int c = 0;
while((c = in.read()) >= 0) {
if(c == '1' || c == '0') buffer.add((char)c);
if(buffer.size() == 8) {
bytes.add(convertToByte(buffer));
buffer.clear();
}
}
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