Input Output Stream

// FILE Stream
// Network Stream
// => InputStream
// => OutputStream

import org.junit.Test;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

public class Program_0308 {
	public static final String SRC_PATH = "/Users/ourguide/Downloads/1.pdf";
	public static final String DEST_PATH = "/Users/ourguide/Desktop/4.pdf";

	public static void fileCopy(String src, String dest) throws Exception {
		FileInputStream fis = new FileInputStream(src);
		FileOutputStream fos = new FileOutputStream(dest);

		while (true) {
			int data = fis.read();
			if (data == -1)
				break;
			fos.write(data);
		}
	}

// Java Stream 기반의 처리 방식
// => 각각의 기능을 별도의 클래스로 제공하고 있다.
// => 자바의 파일 IO는 성능에 문제가 있다.
// : NIO API
	public static void fileCopy2(String src, String dest) throws Exception {
		FileInputStream fis = new FileInputStream(src);
		BufferedInputStream bis = new BufferedInputStream(fis);

		FileOutputStream fos = new FileOutputStream(dest);
		BufferedOutputStream bos = new BufferedOutputStream(fos);

		while (true) {
			int data = bis.read();
			if (data == -1)
				break;
			bos.write(data);
		}
	}


	@Test
	public void copyTest1() throws Exception {
		fileCopy(SRC_PATH, DEST_PATH);
	}

	@Test
	public void copyTest2() throws Exception {
		fileCopy2(SRC_PATH, DEST_PATH);
	}

	@Test
	public void copyTest3() throws Exception {
		Path spath = Paths.get(SRC_PATH);
		Path dpath = Paths.get(DEST_PATH);
		Files.copy(spath, dpath);
	}
}