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:
01 02 03 04 05 06 07 08 09 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 | 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.
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