Java实现文件复制及文件夹复制几种常用的方式

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
public class ByteStreamCopyExample {
    public static void main(String[] args) {
        String sourceFilePath = "source.txt";
        String destinationFilePath = "destination.txt";
        try (FileInputStream fis = new FileInputStream(sourceFilePath);
             FileOutputStream fos = new FileOutputStream(destinationFilePath)) {
            byte[] buffer = new byte[1024];
            int bytesRead;
            while ((bytesRead = fis.read(buffer)) != -1) {
                fos.write(buffer, 0, bytesRead);
            }
            System.out.println("文件复制成功！");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
public class CharacterStreamCopyExample {
    public static void main(String[] args) {
        String sourceFilePath = "source.txt";
        String destinationFilePath = "destination.txt";
        try (FileReader fr = new FileReader(sourceFilePath);
             FileWriter fw = new FileWriter(destinationFilePath)) {
            char[] buffer = new char[1024];
            int charsRead;
            while ((charsRead = fr.read(buffer)) != -1) {
                fw.write(buffer, 0, charsRead);
            }
            System.out.println("文件复制成功！");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
public class Text6 {
    public static void main(String[] args) {
        try (FileInputStream fis = new FileInputStream("user.txt");
             FileOutputStream fos = new FileOutputStream("user1.txt")) {
            fis.transferTo(fos);
            System.out.println("文件复制成功！");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

import java.io.IOException;
import java.nio.channels.FileChannel;
import java.nio.file.Path;
import java.nio.file.StandardCopyOption;
public class ChannelCopyExample {
    public static void main(String[] args) {
        Path sourceFilePath = Path.of("source.txt");
        Path destinationFilePath = Path.of("destination.txt");
        try (FileChannel sourceChannel = FileChannel.open(sourceFilePath);
             FileChannel destinationChannel = FileChannel.open(destinationFilePath,
                     StandardOpenOption.CREATE, StandardOpenOption.WRITE, StandardOpenOption.TRUNCATE_EXISTING)) {
            destinationChannel.transferFrom(sourceChannel, 0, sourceChannel.size());
            System.out.println("文件复制成功！");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

import org.apache.commons.io.FileUtils;
import java.io.File;
import java.io.IOException;
public class ApacheCommonsIOCopyExample {
    public static void main(String[] args) {
        File sourceFile = new File("source.txt");
        File destinationFile = new File("destination.txt");
        try {
            FileUtils.copyFile(sourceFile, destinationFile);
            System.out.println("文件复制成功！");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.StandardCopyOption;
public class Text7 {
    public static void main(String[] args) {
        File sourceDir = new File("D:\\A---webdate");
        File destinationDir = new File("D:\\A---webdate1");
        try {
            copyDirectory(sourceDir, destinationDir);
            System.out.println("目录复制成功！");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
//在copyDirectory()方法中，我们首先检查目标目录是否存在，如果不存在，则创建该目录。
// 然后遍历源目录下的所有文件和子目录，根据文件类型调用copyDirectory()或copyFile()方法进行复制操作。
// 对于子目录，递归调用copyDirectory()方法；对于文件，调用copyFile()方法。
    public static void copyDirectory(File sourceDir, File destinationDir) throws IOException {
        if (!destinationDir.exists()) {
            destinationDir.mkdirs();
        }
        File[] files = sourceDir.listFiles();
        if (files != null) {
            for (File file : files) {
                File destinationFile = new File(destinationDir, file.getName());
                if (file.isDirectory()) {
                    copyDirectory(file, destinationFile);
                } else {
                    copyFile(file, destinationFile);
                }
            }
        }
    }
//在copyFile()方法中，我们使用Files.copy()方法将源文件的内容复制到目标文件中。
    public static void copyFile(File sourceFile, File destinationFile) throws IOException {
        Files.copy(sourceFile.toPath(), destinationFile.toPath(), StandardCopyOption.REPLACE_EXISTING);
// 这里可以使用你前面提到的复制文件的方法，如 transferTo() 或者使用缓冲区的方式复制
    }
}