FileInputStream
Read file with FileInputStream
With this example we are going to demonstrate how to read a File with a FileInputStream. The FileInputStream obtains input bytes from a file in a file system. In short, to read a File with a FileInputStream you should:
- Create a new File instance by converting the given pathname string into an abstract pathname.
- Create a FileInputStream by opening a connection to an actual file, the file named by the path name name in the file system.
- Create a StringBuffer with no characters in it and an initial capacity of 16 characters.
- Read data from the file using
read()
API method of FileinputStream and append it to the StringBuffer, usingappend(char c)
API method of StringBuffer. - Close the stream using close() API method.
Let’s take a look at the code snippet that follows:
package com.javacodegeeks.snippets.core; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; public class ReadFileWithFileInputStream { public static void main(String[] args) { File file = new File("inputfile.txt"); FileInputStream fin = null; int ch; StringBuffer sb = new StringBuffer(); try { // create FileInputStream object fin = new FileInputStream(file); // Read bytes of data from this input stream while((ch = fin.read()) != -1) { sb.append((char)ch); } System.out.println("File content: " + sb); } catch (FileNotFoundException e) { System.out.println("File not found" + e); } catch (IOException ioe) { System.out.println("Exception while reading file " + ioe); } finally { // close the stream using close method try { if (fin != null) { fin.close(); } } catch (IOException ioe) { System.out.println("Error while closing stream: " + ioe); } } } }
This was an example of how to read a File with a FileInputStream in Java.