java打包文件成压缩包

/**
     * 把文件集合打成zip压缩包
     *
     * @param srcFiles 压缩文件集合
     * @param zipFile  zip文件名
     * @throws RuntimeException 异常
     */
    public static void toZip(List<File> srcFiles, File zipFile) throws RuntimeException {
        long start = System.currentTimeMillis();

        if (zipFile == null) {
            log.error("压缩包文件名为空！");
            return;
        }
        if (!zipFile.getName().endsWith(".zip")) {
            log.error("压缩包文件名异常，zipFile={}", zipFile.getPath());
            return;
        }
        ZipOutputStream zos = null;
        try {
            FileOutputStream out = new FileOutputStream(zipFile);
            zos = new ZipOutputStream(out);
            for (File srcFile : srcFiles) {
                zos.putNextEntry(new ZipEntry(srcFile.getName()));
                FileInputStream in = new FileInputStream(srcFile);
                byte[] bytes = Files.readAllBytes(Paths.get(srcFile.getPath()));
                zos.write(bytes, 0, bytes.length);
                zos.flush();
                zos.closeEntry();
                in.close();
                out.flush();
                out.close();
            }

            long end = System.currentTimeMillis();

            log.info("压缩完成，耗时：" + (end - start) + " ms");

        } catch (Exception e) {
            log.error("ZipUtil toZip exception, ", e);

            throw new RuntimeException("zipFile error from ZipUtils", e);

        }

    }

用以上方法生成压缩包，压缩包里文件内容并没有写入进去，从而生成的文件为0kb，这就导致这段方法毫无意义