java将文件夹压缩成zip

可以使用Java的ZipOutputStream类来压缩文件夹。以下是一个示例代码：

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

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

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

        addFolderToZip("", sourceFolder, zos);

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

    private static void addFolderToZip(String path, String folder, ZipOutputStream zip) throws IOException {
        File folderFile = new File(folder);
        if (folderFile.isDirectory()) {
            for (String fileName : folderFile.list()) {
                String filePath = folder + File.separator + fileName;
                if (path.equals("")) {
                    addFolderToZip(fileName, filePath, zip);
                } else {
                    addFolderToZip(path + File.separator + fileName, filePath, zip);
                }
            }
        } else {
            FileInputStream fis = new FileInputStream(folder);
            ZipEntry zipEntry = new ZipEntry(path);
            zip.putNextEntry(zipEntry);

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

            zip.closeEntry();
            fis.close();
        }
    }
}

在代码中，首先指定要压缩的文件夹的路径和压缩后的zip文件的路径。然后创建一个FileOutputStream和一个ZipOutputStream，将它们传递给一个addFolderToZip方法。该方法会递归地遍历文件夹，并将文件夹中的每个文件添加到ZipOutputStream中。最后关闭ZipOutputStream和FileOutputStream。