2021-05-13

课堂代码

import java.io.File;

public class Demo01 {
    public static void main(String[] args) {
        //展示树文件
        File f = new File("d:/demo01");
        printTree(f,0);
    }

    public static void printTree(File f , int level ){
        for (int i = 0; i 

import com.sun.javafx.iio.ios.IosDescriptor;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

// 1 实现文件的复制
public class Demo02 {
    public static void main(String[] args) throws Exception {
        FileInputStream fi = null;
        FileOutputStream fo = null;
        try {
            //  1 准备输入输出流
            fi = new FileInputStream("D:\\alg\\ChromeSetup.exe");
            fo = new FileOutputStream("C:\\dex\\chen_long.exe");

            int len = 0;
            byte[] b = new byte[1024];
            while ((len = fi.read(b)) != -1) {
                fo.write(b, 0, len);
            }
            } catch(IOException e){
                System.out.println("文件路径不存在");
            }

        }

    }

import java.io.*;
import java.util.Date;

public class Demo03 {
    public static void main(String[] args) throws Exception {
        BufferedInputStream fi = null;
        BufferedOutputStream fo = null;
        try {
            //  1 准备输入输出流
            fi = new BufferedInputStream(new FileInputStream("D:\\alg\\ChromeSetup.exe"));
            fo = new BufferedOutputStream(new FileOutputStream("C:\\dex\\chen_long.exe"));

            int len = 0;
            byte[] b = new byte[1024];
            long startTime = System.currentTimeMillis();
            while ((len = fi.read(b)) != -1) {
                fo.write(b, 0, len);
            }
            long endTime = System.currentTimeMillis();
            System.out.println(endTime-startTime);
        } catch (IOException e) {
            System.out.println("文件路径不存在");
        }
    }
}

import jdk.internal.module.ModulePatcher;

import java.io.*;

public class Demo04 {
    public static void main(String[] args) throws Exception{
            Reader = new FileReader("E:\\xcdq.txt");
            Writer = new FileWriter("D:\\edu\\atm.txt");
        int len = 0;
        char [] buffer  = new char[1024];
        ModulePatcher.PatchedModuleReader reader = null;
        while ( (len = reader.read(buffer) ) != -1) {
            writer.write(buffer , 0 , len);
        }
        reader.close();
        writer.close();
    }
}