Java IO如何进行数据压缩与解压

在Java中，可以使用java.util.zip包中的类来进行数据的压缩和解压。以下是一个简单的示例，演示了如何使用这些类进行文件的压缩和解压。

压缩文件

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

public class ZipUtil {

    public static void zipFile(String sourceFilePath, String zipFilePath) throws IOException {
        FileInputStream fis = null;
        FileOutputStream fos = null;
        ZipOutputStream zos = null;

        try {
            fis = new FileInputStream(sourceFilePath);
            fos = new FileOutputStream(zipFilePath);
            zos = new ZipOutputStream(fos);

            ZipEntry zipEntry = new ZipEntry(sourceFilePath);
            zos.putNextEntry(zipEntry);

            byte[] buffer = new byte[1024];
            int len;
            while ((len = fis.read(buffer)) > 0) {
                zos.write(buffer, 0, len);
            }

            zos.closeEntry();
        } finally {
            if (zos != null) {
                zos.close();
            }
            if (fos != null) {
                fos.close();
            }
            if (fis != null) {
                fis.close();
            }
        }
    }

    public static void main(String[] args) {
        try {
            zipFile("path/to/source/file.txt", "path/to/destination/file.zip");
            System.out.println("File compressed successfully!");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

解压文件

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

public class UnzipUtil {

    public static void unzipFile(String zipFilePath, String destDirectory) throws IOException {
        FileInputStream fis = null;
        ZipInputStream zis = null;
        ZipEntry zipEntry = null;

        try {
            fis = new FileInputStream(zipFilePath);
            zis = new ZipInputStream(fis);

            while ((zipEntry = zis.getNextEntry()) != null) {
                String filePath = destDirectory + File.separator + zipEntry.getName();
                if (!zipEntry.isDirectory()) {
                    extractFile(zis, filePath);
                } else {
                    File dir = new File(filePath);
                    dir.mkdirs();
                }
                zis.closeEntry();
            }
        } finally {
            if (zis != null) {
                zis.close();
            }
            if (fis != null) {
                fis.close();
            }
        }
    }

    private static void extractFile(ZipInputStream zis, String filePath) throws IOException {
        FileOutputStream fos = null;
        try {
            fos = new FileOutputStream(filePath);
            byte[] buffer = new byte[1024];
            int len;
            while ((len = zis.read(buffer)) > 0) {
                fos.write(buffer, 0, len);
            }
        } finally {
            if (fos != null) {
                fos.close();
            }
        }
    }

    public static void main(String[] args) {
        try {
            unzipFile("path/to/destination/file.zip", "path/to/extract/directory");
            System.out.println("File extracted successfully!");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

这两个示例分别演示了如何压缩和解压文件。你可以根据需要修改这些示例，以适应你的具体需求。