package p1;
import java.util.*;
import java.io.*;
public class Main {
	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		System.out.println("請(qǐng)輸入路徑：");
		String path = scanner.next();
		File file = new File(path);
		if(file.isDirectory()) {//類型為目錄時(shí)
			if(!file.exists()) {//目錄不存在時(shí)
				System.out.println("該路徑不存在!");
			}else {
				System.out.println("該文件夾下的路徑如下：");
				String[] sub = file.list();//獲取文件夾下的所有文件、文件夾
				for(String i:sub) {//輸出
					System.out.println(i);
				}
			}
		}else {//不為目錄時(shí)
			System.out.println("該路徑不為目錄!");
		}
	}
}

package p2;
import java.util.*;
import java.io.*;
public class Main {
	public static void main(String[] args)  throws Exception{
		Scanner scanner = new Scanner(System.in);
		System.out.println("1. 復(fù)制");
		System.out.println("2. 剪切");
		System.out.println("請(qǐng)選擇: ");
		int choose = scanner.nextInt();
		System.out.println("源路徑: ");
		String resource = scanner.next();
		System.out.println("目標(biāo)路徑: ");
		String target = scanner.next();
		if(choose==1) {//復(fù)制
			FileOperation.copy(resource,target);
		}else {//剪切
			FileOperation.cut(resource, target);
		}
		System.out.println("執(zhí)行完畢");
	}
}
class FileOperation{//文件操作類
	public static void copy(String resource,String target)  throws Exception{//復(fù)制文件
		//文件流對(duì)象
		File file_resource = new File(resource);//源文件
		File file_target = new File(target);//目標(biāo)文件
		//文件輸入輸出流對(duì)象
		FileInputStream fis = new FileInputStream(file_resource);//輸入流，寫入數(shù)據(jù)
		FileOutputStream fos = new FileOutputStream(file_target);//輸出流，讀取數(shù)據(jù)
		//讀取文件數(shù)據(jù)
		byte[] buff_resource = new byte[(int) file_resource.length()];
		fis.read(buff_resource);//讀取文件數(shù)據(jù)
		//寫入文件數(shù)據(jù)
		String str = new String(buff_resource);
		byte[] buff_target = str.getBytes();
		fos.write(buff_target);//寫入文件數(shù)據(jù)
		//關(guān)閉文件流
		fis.close();
		fos.close();
	}
	public static void cut(String resource,String target)  throws Exception{//剪切文件
		//文件流對(duì)象
		//File file_delete = new File(resource);//源文件
		File file_resource = new File(resource);//源文件
		File file_target = new File(target);//目標(biāo)文件
		//文件輸入輸出流對(duì)象
		FileInputStream fis = new FileInputStream(file_resource);//輸入流，讀取數(shù)據(jù)
		FileOutputStream fos = new FileOutputStream(file_target);//輸出流，寫入數(shù)據(jù)
		//讀取文件數(shù)據(jù)
		byte[] buff_resource = new byte[(int) file_resource.length()];
		fis.read(buff_resource);//讀取文件數(shù)據(jù)
		//寫入文件數(shù)據(jù)
		String str = new String(buff_resource);
		byte[] buff_target = str.getBytes();
		fos.write(buff_target);//寫入文件數(shù)據(jù)
		//關(guān)閉文件流
		fis.close();
		fos.close();
		//刪除源文件，必須先關(guān)閉fis文件流后才能成功刪除文件
		file_resource.delete();
	}
}

package p3;
import java.io.*;
public class Main {
	public static void main(String[] args) throws IOException{
		String str = "2018 FIFA World Cup will play in Russia.";
		Write("D:\\data.txt",str);
		System.out.println(Read("D:\\data.txt"));
	}
	public static String Read(String filename) throws IOException{//文件讀取
		File file = new File(filename);
		FileInputStream fis = new FileInputStream(file);//輸入流，讀取數(shù)據(jù)
		byte[] buff = new byte[(int) file.length()];
		fis.read(buff);//讀取文件
		String str = new String(buff);
		fis.close();
		return str;
	}
	public static void Write(String filename,String str) throws IOException{//文件寫入
		File file = new File(filename);
		FileOutputStream fos = new FileOutputStream(file);//輸出流，寫入數(shù)據(jù)
		byte[] buff = str.getBytes();
		fos.write(buff);//寫入文件
		fos.close();
	}
}