Java文件压缩与解压缩示例代码及技术解答

此示例代码展示了如何使用Java实现文件的压缩与解压缩功能。通过Java中的压缩库和解压库，可以轻松地对文件进行压缩和解压缩操作，实现文件大小的减小和文件内容的还原。

import java.io.*;
import java.util.zip.*;

public class FileCompression {

    // 压缩文件
    public static void compressFile(String sourceFile, String destinationZip) throws IOException {
        FileOutputStream fos = new FileOutputStream(destinationZip);
        ZipOutputStream zipOut = new ZipOutputStream(fos);
        File fileToZip = new File(sourceFile);

        FileInputStream fis = new FileInputStream(fileToZip);
        ZipEntry zipEntry = new ZipEntry(fileToZip.getName());
        zipOut.putNextEntry(zipEntry);

        byte[] bytes = new byte[1024];
        int length;
        while ((length = fis.read(bytes)) >= 0) {
            zipOut.write(bytes, 0, length);
        }

        fis.close();
        zipOut.close();
        fos.close();
    }

    // 解压文件
    public static void decompressFile(String zipFile, String destinationFolder) throws IOException {
        File destDir = new File(destinationFolder);
        byte[] buffer = new byte[1024];
        ZipInputStream zis = new ZipInputStream(new FileInputStream(zipFile));
        ZipEntry zipEntry = zis.getNextEntry();

        while (zipEntry != null) {
            File newFile = newFile(destDir, zipEntry);
            FileOutputStream fos = new FileOutputStream(newFile);
            int len;
            while ((len = zis.read(buffer)) > 0) {
                fos.write(buffer, 0, len);
            }
            fos.close();
            zipEntry = zis.getNextEntry();
        }
        zis.closeEntry();
        zis.close();
    }

    private static File newFile(File destinationDir, ZipEntry zipEntry) throws IOException {
        File destFile = new File(destinationDir, zipEntry.getName());

        String destDirPath = destinationDir.getCanonicalPath();
        String destFilePath = destFile.getCanonicalPath();

        if (!destFilePath.startsWith(destDirPath + File.separator)) {
            throw new IOException("Entry is outside of the target directory: " + zipEntry.getName());
        }

        return destFile;
    }
}

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