迟到的第14周作业

一.题目：编写一个应用程序，输入一个目录和一个文件类型，显示该目录下符合该类型的所有文件。

package file;

import java.io.File;
import java.io.FilenameFilter;
import java.util.Scanner;

public class file {
    public static void main(String[] args) {
        Scanner reader = new Scanner(System.in);
        System.out.print("请输入目录");
        File f = new File(reader.nextLine());
        String[] filenames = f.list();
        System.out.print("该目录的文件为" + "\n");

        for (int i = 0; i < filenames.length; i++) {
            System.out.print(filenames[i] + "\n");
        }
        System.out.print("请输入你想查找文件的类型:");
        X typefile = new X(reader.nextLine());
        String[] filenames1 = f.list(typefile);
        System.out.print("此类型文件为");
        for (int i = 0; i < filenames1.length; i++) {
            System.out.print(filenames1[i] + "\n");
        }
    }

}

class X implements FilenameFilter {
    String type;

    X(String type) {
        this.type = type;
    }

    public boolean accept(File file, String name) {
        return name.endsWith(type);
    }
}

(2)运行成功截图

 

 

二.之后，将这些文件中的某一个文件剪切到另外一个目录中。

package file;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FilenameFilter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Scanner;

public class Cutfiles {
    public static void main(String[] args) {
        Scanner reader = new Scanner(System.in);
        System.out.print("请输入目录");
        String path = reader.nextLine();
        File f = new File(path);
        String[] filenames = f.list();
        System.out.print("该目录的文件为" + "\n");

        for (int i = 0; i < filenames.length; i++) {
            System.out.print(filenames[i] + "\n");
        }
        System.out.print("请输入你想查找文件的类型:");
        X1 typefile = new X1(reader.nextLine());
        String[] filenames1 = f.list(typefile);
        System.out.print("此类型文件为");
        for (int i = 0; i < filenames1.length; i++) {
            System.out.print(filenames1[i] + "\n");
        }
        System.out.print("请输入需要剪切的文件名:\n");
        String cut = reader.nextLine();
        File cutfile = new File(path + "\\" + cut);
        System.out.print("请输入该文件需要移动到的目录：\n");
        String cutpath = reader.nextLine();

        File file1 = new File(cutpath);
        file1 = cutfile;
        File file2 = new File(cutpath + "\\" + cut);

        // 在程序结束时删除文件1
        file1.deleteOnExit();
        try {

            file2.createNewFile();
        } catch (IOException e) {
            e.printStackTrace();
        }
        cutFile(file1, file2);
    }

    public static void cutFile(File file1, File file2) {
        FileOutputStream fileOutputStream = null;
        InputStream inputStream = null;
        byte[] bytes = new byte[1024];
        int temp = 0;
        try {
            inputStream = new FileInputStream(file1);
            fileOutputStream = new FileOutputStream(file2);
            while ((temp = inputStream.read(bytes)) != -1) {
                fileOutputStream.write(bytes, 0, temp);
                fileOutputStream.flush();
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (inputStream != null) {
                try {
                    inputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (fileOutputStream != null) {
                try {
                    fileOutputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

    }
}

class X1 implements FilenameFilter {
    String type;

    X1(String type) {
        this.type = type;
    }

    public boolean accept(File file, String name) {
        return name.endsWith(type);
    }
}

(2)运行成功截图