java_NIO文件操作

package com.toec;

import java.io.File;
import java.io.IOException;
import java.nio.file.*;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.concurrent.atomic.AtomicInteger;

public class TestFilesWalkFileTree {
    public static void main(String[] args) throws IOException {
//        fileAndDirCount();
//        jarCount();
        Files.walkFileTree(Paths.get("G:\\tools\\02\\download"),new SimpleFileVisitor<Path>(){
            @Override
            public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) throws IOException {
                System.out.println("============>进入:"+dir);
                return super.preVisitDirectory(dir, attrs);
            }

            @Override
            public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
                System.out.println("==========="+file);
                // 删除文件，不经过回收站，谨慎操作
                Files.delete(file);
                return super.visitFile(file, attrs);
            }

            @Override
            public FileVisitResult postVisitDirectory(Path dir, IOException exc) throws IOException {
                 // 删除文件夹，不经过回收站，谨慎操作
                Files.delete(dir);
                System.out.println("<============退出："+dir);
                return super.postVisitDirectory(dir, exc);
            }
        });


    }
	//计算文件数量
    public static void jarCount() throws IOException {
        Path path = Paths.get("E:\\ProgramDatas\\java\\jdk");
        AtomicInteger jarCount = new AtomicInteger();
        Files.walkFileTree(path,new SimpleFileVisitor<Path>(){
            @Override
            public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) throws IOException {
                return super.preVisitDirectory(dir, attrs);
            }

            @Override
            public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
                if(file.toString().endsWith(".jar")){
                    System.out.println(file);
                    jarCount.incrementAndGet();
                }
                return super.visitFile(file, attrs);
            }
        });
        System.out.println("============>"+jarCount);
    }
	//遍历文件夹
    public static void fileAndDirCount() throws IOException {
        AtomicInteger dirCount = new AtomicInteger();
        AtomicInteger fileCount = new AtomicInteger();
        Path path = Paths.get("E:\\ProgramDatas\\java\\jdk");
        Files.walkFileTree(path,new SimpleFileVisitor<Path>(){
            @Override
            public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) throws IOException {
                System.out.println("===============>"+dir);
                dirCount.incrementAndGet();
                return super.preVisitDirectory(dir, attrs);
            }

            @Override
            public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
                System.out.println("===========>"+file);
                fileCount.incrementAndGet();
                return super.visitFile(file, attrs);
            }

            @Override
            public FileVisitResult postVisitDirectory(Path dir, IOException exc) throws IOException {
                return super.postVisitDirectory(dir, exc);
            }
        });
        System.out.println("dir Count"+dirCount);
        System.out.println("file Count"+fileCount);
    }
}

文件目录拷贝

package com.toec;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;

public class TestFilesCopy {
    public static void main(String[] args) throws IOException {
        String source = "G:\\tools\\4-19-2022\\2_level\\down_package";
        String target = "G:\\tools\\4-19-2022\\2_level\\copy_down";
        Files.walk(Paths.get(source)).forEach(path -> {
            try {
            String targetName = path.toString().replace(source, target);
            // 目录处理
            if(Files.isDirectory(path)){
                Files.createDirectories(Paths.get(targetName));
            }else if(Files.isRegularFile(path)){
                Files.copy(path,Paths.get(targetName));
            }
            } catch (IOException e) {
                e.printStackTrace();
            }
        });

    }
}