java 打包异常：ZIP file must have at least one entry

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java 打包异常：ZIP file must have at least one entry15

今天遇到个bug，在导出数据打成zip包的时候，在本机(xp)上成功，在服务器(linux)上报异常，
异常如下：ZIP file must have at least one entry。
上网查了，但是更多的是关于路径名有中文的问题，但是我在本机和服务器上都是英文目录，以下是我
的部分代码：

         /**
	 * Creates a Zip archive. If the name of the file passed in is a directory,
	 * the directory's contents will be made into a Zip file.
	 */
	public static String makeZip(String fileName) throws IOException,
			FileNotFoundException {
		File file = new File(fileName);
		ZipOutputStream zos = null;
		try {
			zos = new ZipOutputStream(new FileOutputStream(file + ".zip"));
			// Call recursion.
			recurseFiles(file, zos);
		} finally {
			if (null != zos) {
				zos.close();
			}
		}
		return file + ".zip";
	}

 private static void recurseFiles(File file, ZipOutputStream zos)
			throws IOException, FileNotFoundException {
		if (file.isDirectory()) {
			// Create an array with all of the files and subdirectories
			// of the current directory.
			String[] fileNames = file.list();
			if (fileNames != null) {
				// Recursively add each array entry to make sure that we get
				// subdirectories as well as normal files in the directory.
				for (int i = 0; i < fileNames.length; i++) {
					recurseFiles(new File(file, fileNames[i]), zos);// 给子目录里的文件打包!!
				}
			}
		}
		// Otherwise, a file so add it as an entry to the Zip file.
		else {
			byte[] buf = new byte[1024];
			int len;
			// Create a new Zip entry with the file's name.
			ZipEntry zipEntry = new ZipEntry(file.getName());
			// Create a buffered input stream out of the file
			// we're trying to add into the Zip archive.
			FileInputStream fin = new FileInputStream(file);
			BufferedInputStream in = new BufferedInputStream(fin);
			zos.putNextEntry(zipEntry);
			// Read bytes from the file and write into the Zip archive.
			while ((len = in.read(buf)) >= 0) {
				zos.write(buf, 0, len);
			}
			// Close the input stream.
			in.close();
			// Close this entry in the Zip stream.
			zos.closeEntry();
		}
	}

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