怎么用java压缩文件夹下所有文件

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你可以使用 Java 的 ZipOutputStream 类来压缩文件夹下的所有文件。以下是一个示例代码：

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

public class FileCompression {public static void main(String[] args) {String sourceFolder = "path/to/source/folder";
        String zipFile = "path/to/output/zip/file.zip";

        try {FileOutputStream fos = new FileOutputStream(zipFile);
            ZipOutputStream zos = new ZipOutputStream(fos);

            // 压缩文件夹下的所有文件
            File folder = new File(sourceFolder);
            compressFolder(folder, folder.getName(), zos);

            zos.close();
            fos.close();

            System.out.println(" 文件夹压缩完成。");
        } catch (IOException e) {e.printStackTrace();
        }
    }

    private static void compressFolder(File folder, String parentFolder, ZipOutputStream zos) throws IOException {for (File file : folder.listFiles()) {if (file.isDirectory()) {compressFolder(file, parentFolder + "/" + file.getName(), zos);
                continue;
            }

            FileInputStream fis = new FileInputStream(file);
            ZipEntry zipEntry = new ZipEntry(parentFolder + "/" + file.getName());
            zos.putNextEntry(zipEntry);

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

            fis.close();}
    }
}