JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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How to read file content using byte array?


Description:

Write a program to read a file using byte array. You need to read fixed size of content each time, read multiple times, till end of the file.


Code:
package com.java2novice.files;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;

/**
 * Reading contents from a file into byte array.
 *
 */
public class FileToByteArray {

	public static void main(String a[]){
		
		String fileName = "C:/MyFile.txt";
		InputStream is = null;
		try {
			is = new FileInputStream(fileName);
			byte content[] = new byte[2*1024];
		    int readCount = 0;
			while((readCount = is.read(content)) > 0){
		    	System.out.println(new String(content, 0, readCount-1));
		    }
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try{
				if(is != null) is.close();
			} catch(Exception ex){
				
			}
		}
	}
}
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Knowledge Centre
ServletOuptputStream Vs PrintWriter
ServletOutputStream: ServletResponse.getOutputStream() returns a ServletOutputStream suitable for writing binary data in the response. The servlet container does not encode the binary data, it sends the raw data as it is.

PrintWriter: ServletResponse.getWriter() returns PrintWriter object which sends character text to the client. The PrintWriter uses the character encoding returned by getCharacterEncoding(). If the response's character encoding has not been specified then it does default character encoding.
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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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