java.util.zip包 OutputStream ZipOutputStream以压缩包的方式导出

转自：https://blog.csdn.net/lvoelife/article/details/108620182

 /**
     * 压缩文件
     * @param fileIds 文件id：根据id可获取文件
     * @param packageName 下载压缩文件包名
     * @param response
     */
    public void downLoadZipFile(List<Long> fileIds,String packageName,HttpServletResponse response){
        OutputStream out = null;
        ZipOutputStream zos = null;
        BufferedInputStream bis = null;
        try {
            if (CollectionUtil.isNotEmpty(fileIds)){
                out = response.getOutputStream();
                //创建压缩文件需要的空的zip包
                String zipName =  packageName + System.currentTimeMillis() + ".zip";
                String zipFilePath = temPath + File.separator + zipName;
                //压缩文件
                File zip = new File(zipFilePath);
                if (!zip.exists()) {
                    zip.createNewFile();
                }
                //创建zip文件输出流
                zos = new ZipOutputStream(new FileOutputStream(zip));
                zipFile(fileIds, zos);
                response.setContentType("text/html; charset=UTF-8"); //设置编码字符
                response.setContentType("application/octet-stream"); //设置内容类型为下载类型
                response.setHeader("Content-disposition", "attachment;filename=" + zipName);//设置下载的文件名称
                //将打包后的文件写到客户端，输出的方法同上，使用缓冲流输出
                bis = new BufferedInputStream(new FileInputStream(zipFilePath));
                byte[] buff = new byte[bis.available()];
                bis.read(buff);
                out.flush();//释放缓存
                out.write(buff);//输出数据文件
            }
        } catch (IOException e) {
            e.printStackTrace();
            log.error("-------------文件下载失败----------------");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            doClose(bis, out, zos);
        }
    }

    private void doClose(InputStream inputStream, OutputStream... outputStreams) {
        try {
            if (inputStream != null) {
                inputStream.close();
            }
            if (outputStreams != null && outputStreams.length > 0) {
                for (OutputStream outputStream : outputStreams) {
                    outputStream.close();
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private void zipFile(List<Long> FileIds, ZipOutputStream zos) throws Exception {
        for (Long fileId : FileIds) {
            FileBox fileBox = getFileById(fileId);
            File inputFile = fileBox.getFile();
            //创建输入流读取文件
            BufferedInputStream bi = new BufferedInputStream(new FileInputStream(inputFile));
            //将文件写入zip内，即将文件进行打包
            zos.putNextEntry(new ZipEntry(inputFile.getName()));
            //写入文件的方法，同上
            int size = 0;
            byte[] buffer = new byte[1024];  //设置读取数据缓存大小
            while ((size = bi.read(buffer)) > 0) {
                zos.write(buffer, 0, size);
            }
            //关闭输入输出流
            zos.closeEntry();
            bi.close();
        }
        zos.close();
    }