Kosta 클라우드 네이티브 애플리케이션 개발 (CNA) 교육 18일차

package com.lec;

import java.io.File;
import java.text.DecimalFormat;
import java.util.stream.IntStream;

public class chap13_File2 {

	public void getDirect(String fileDir) {

		File f = new File(fileDir);
		File[] files = f.listFiles();

		for (int i = 0; i < files.length; i++) {

			if (files[i].isDirectory()) {
				getDirect(files[i].getAbsolutePath());
			} else {
//				System.out.println(files[i].getName());
			}
		}
	}

	public void getDirect2(String fileDir) {
		
		File f = new File(fileDir);
		File[] files = f.listFiles();

		IntStream.range(0, files.length)
		.mapToObj(i -> files[i])
		.forEach(file -> {
			if (file.isDirectory()) {
				getDirect(file.getAbsolutePath());
			} else {
//				System.out.println(file.getName());
			}
		});

	}

	public static void main(String[] args) {


		chap13_File2 cf = new chap13_File2();

		String fileName = "C:\\IT\\files\\apache-tomcat-9.0.86";

		DecimalFormat formatter = new DecimalFormat("###,###");

		File f = new File(fileName);
		File[] fileArray = f.listFiles();

		long startTime = System.nanoTime();
		
		cf.getDirect(fileName);
		
		long endTime = System.nanoTime();
		long duration = endTime - startTime;
		
		System.out.println("실행 시간: " + duration + "ns");
		
		
		long startTime2 = System.nanoTime();
		
		cf.getDirect2(fileName);
		
		long endTime2 = System.nanoTime();
		long duration2 = endTime2 - startTime2;
		System.out.println("실행 시간: " + duration2 + "ns");
		
		
		
		
	}
}

 

 

package com.lec;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Arrays;

public class chap14_IO {

	public static void main(String[] args) {

		chap14_IO io = new chap14_IO();
//		io.io_1();
//		io.io_2();
		io.io_3();

	}
	
	public void io_3() {
		
		String inPath = "C:\\IT\\STS3917\\STS3_WORKSPACE\\pij_java\\src\\com\\lec\\in.txt";
		String outPath = "C:\\IT\\STS3917\\STS3_WORKSPACE\\pij_java\\src\\com\\lec\\out.txt";
		
		try {
			BufferedInputStream bis = new BufferedInputStream(new FileInputStream(inPath)) ;
			BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(outPath));
			
			
			int data = 0;
			
			while ((data = bis.read()) != -1) {

				System.out.println(data);

				bos.write(data);
			}
			
			System.out.println(bos);
			bis.close();
			bos.close();
			
			
			
		} catch(IOException e) {
			System.out.println("3번 오류");
		}

	
	}

	public void io_2() {
		
		String inPath = "C:\\IT\\STS3917\\STS3_WORKSPACE\\pij_java\\src\\com\\lec\\in.txt";
		String outPath = "C:\\IT\\STS3917\\STS3_WORKSPACE\\pij_java\\src\\com\\lec\\out.txt";
		

		try {
					
			FileInputStream bais = new FileInputStream(inPath);		
			FileOutputStream baos = new FileOutputStream(outPath);
			
			
			int data = 0;
			
			while ((data = bais.read()) != -1) {

				System.out.println(data);

				baos.write(data);
			}
			
			System.out.println(baos);
			bais.close();
			baos.close();
			
		}catch (FileNotFoundException e) {
			System.out.println("2-1번 오류");
		}catch (IOException e) {
			System.out.println("2-2번 오류");
		}
		
	}

	public void io_1() {
		try {
			byte[] inBarr = { 0, 1, 2, 3, 4 };
			byte[] outBarr = null;

			ByteArrayInputStream bais = new ByteArrayInputStream(inBarr);
			ByteArrayOutputStream baos = new ByteArrayOutputStream();

			int data = 0;

			while ((data = bais.read()) != -1) {

				System.out.println(data);

				baos.write(data);
			}

			outBarr = baos.toByteArray();
			System.out.println(Arrays.toString(outBarr));
			bais.close();
			baos.close();

		} catch (IOException e) {
			System.out.println("오류");
		}
	}

}