Java数据备份方法：文件复制与压缩详解

import java.nio.file.*;

public class FileBackupUtil {
    public static void copyDirectory(Path source, Path target) throws IOException {
        Files.walkFileTree(source, new SimpleFileVisitor() {
            @Override
            public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) 
                    throws IOException {
                Path targetDir = target.resolve(source.relativize(dir));
                if (!Files.exists(targetDir)) {
                    Files.createDirectory(targetDir);
                }
                return FileVisitResult.CONTINUE;
            }

            @Override
            public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) 
                    throws IOException {
                Files.copy(file, target.resolve(source.relativize(file)), 
                           StandardCopyOption.REPLACE_EXISTING);
                return FileVisitResult.CONTINUE;
            }
        });
    }
}

import java.util.zip.*;

public class ZipUtil {
    public static void zipDirectory(Path sourceDir, Path zipPath) throws IOException {
        try (ZipOutputStream zos = new ZipOutputStream(Files.newOutputStream(zipPath))) {
            Files.walkFileTree(sourceDir, new SimpleFileVisitor() {
                @Override
                public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) 
                        throws IOException {
                    ZipEntry entry = new ZipEntry(sourceDir.relativize(file).toString());
                    zos.putNextEntry(entry);
                    Files.copy(file, zos);
                    zos.closeEntry();
                    return FileVisitResult.CONTINUE;
                }
            });
        }
    }
}

public class DataBackup {
    public static void performBackup(String sourcePath, String backupDir) throws IOException {
        Path source = Paths.get(sourcePath);
        Path backupRoot = Paths.get(backupDir, "backup_" + System.currentTimeMillis());
        Path zipFile = Paths.get(backupDir, "backup_" + System.currentTimeMillis() + ".zip");

        // 1. 复制文件到临时备份目录
        FileBackupUtil.copyDirectory(source, backupRoot);

        // 2. 压缩备份目录
        ZipUtil.zipDirectory(backupRoot, zipFile);

        // 3. 可选：删除临时目录
        deleteDirectory(backupRoot);

        System.out.println("备份完成: " + zipFile);
    }

    private static void deleteDirectory(Path path) throws IOException {
        if (Files.exists(path)) {
            Files.walkFileTree(path, new SimpleFileVisitor() {
                @Override
                public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) 
                        throws IOException {
                    Files.delete(file);
                    return FileVisitResult.CONTINUE;
                }

                @Override
                public FileVisitResult postVisitDirectory(Path dir, IOException exc) 
                        throws IOException {
                    Files.delete(dir);
                    return FileVisitResult.CONTINUE;
                }
            });
        }
    }
}