In java programming, to perform input and output of 8-bit, Byte stream is used. Most common byte streams classes are, FileInputStream and FileOutputStream. FileInputStream : FileInputStream is used for reads one byte at a time . FileOutputStream : FileOutputStream is used for writes one byte at a time Writing Bytes Example: Write a program, to write a bytes to … Read more
Here we will concatenating and store buffering files in java using BufferedInputClass and BufferedOutputClass. Concatenate: It is possible to concatenate two or more files and save in a different file. In java, by using SequenceInputStream class we can concatenate two or more files. Buffer Files: In java, we can create a buffer to store temporary … Read more
In java, a basic input-output stream provides a method for reading & writing bytes or characters in a file. If we want to read-write primitive data types (such as int, float, etc.) then we can use filter classes to filter data in the original stream. DataInputStream & DataOutputStream are two filter classes used for creating … Read more
For listing a directory content in java we use File class and use isDirectory() method to check whether it is directory or not. if directory then we use listFiles().
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | package io; import java.io.File; public class DirProperties { public static void main(String[] args) { File f = new File("D:\\ebhor"); if (f.exists() == false) { System.out.println("File or Directory does not exists"); if (f.mkdir()) { System.out.println("File is created"); } } if (f.isDirectory()) { System.out.println("This is a directory"); } System.out.println("Total space is " + f.getTotalSpace()); File[] f1 = f.listFiles(); for (File ff : f1) { System.out.println(ff.toString()); } } } |
Reading a file using FileInputStream To read a file using FileInputStream in Java, follow these steps: Import the necessary packages:
1 2 | import java.io.FileInputStream; import java.io.IOException; |
2. Create a FileInputStream object for the file you want to read:
1 | FileInputStream fis = new FileInputStream("filename.txt"); |
3. Create a buffer array to store the data you read from the file:
1 | byte[] buffer = new byte[1024]; |
4. Use the read method of … Read more
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 | package io; import java.io.File; import java.io.IOException; public class FileOrDir { public static void main(String[] args) { File f = new File("D:\\first.txt"); File f1 = new File("D:\\second.txt"); if (f.exists() == false) { System.out.println("File or Directory does not exists"); } if (f.isDirectory()) { System.out.println("This is a directory"); } if (f.isFile()) { System.out.println("This is a file"); System.out.println("File name :" + f.getName()); System.out.println("File path :" + f.getPath()); System.out.println("File Absolute path :" + f.getAbsolutePath()); try { System.out.println("File Canonical path :" + f.getCanonicalPath()); } catch (IOException ex) { System.out.println("IOException " + ex); } System.out.println("File Parent :" + f.getParent()); System.out.println("File can execute :" + f.canExecute()); System.out.println("File can read :" + f.canRead()); System.out.println("File can write :" + f.canWrite()); System.out.println("File last Modified :" + f.lastModified()); try { if (f1.createNewFile()) { System.out.println("File created "); } else { if (f1.exists()) { System.out.println("File already exists "); f1.delete(); System.out.println("File is get deleted "); if (f1.createNewFile()) { System.out.println("now File created "); } } } } catch (IOException ex) { System.out.println("IOException " + ex); } System.out.println("Setting the file readable status :" + f1.setReadable(true)); System.out.println("Setting the file writable status :" + f1.setWritable(false)); System.out.println("Can we write on file :" + f1.canWrite()); } } } |
File handling is need for any web application so FILE HANDLING is an important part of PHP language. Some task to be done file needs to be processed. PHP have many function handling any kind of normal files. (Liketxt, docx, csv, jpg etc) Handle a file need to know below topics i. File create ii. … Read more
In a java programming, like a Byte stream Character stream is also used for input-output for 16 bit. But Byte streams are used to perform input and output of 8-bit. Most common Character streams classes are, FileReader and FileWriter. FileReader- FileReader uses for reads two bytes at a time. FileWriter– FileWriter uses for writes two bytes at a … Read more
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 | package ebhor.io; import java.io.BufferedReader; import java.io.FileNotFoundException; import java.io.FileReader; import java.io.IOException; public class FileReading { public static void main(String[] args) { String line; BufferedReader br=null; try { FileReader fr = new FileReader("D:\\first.txt"); br = new BufferedReader(fr); while ((line = br.readLine()) != null) { System.out.println(line); } } catch (FileNotFoundException e) { System.out.println("File not found " + e); } catch (IOException e) { System.out.println("IO Error " + e); } finally { if (br != null) { try { br.close(); } catch (IOException ex) { System.out.println("File not closed " + ex); } } } } |
For reading a file we have to create a FileReader object. Then we create BufferedReader object of FileReader. If file not found FileReader constructor throws FileNotFoundException. If br.readLine() is not able to read source file it throws IOException.
Checking whether the File object exists if exists then check whether it is file of directory to check file existance exists() method of File class is used if it returns true means file or directory exists, at this point we are not confirm existing File object is file or directory. To check file object isDirectory() … Read more
