java 文件流的处理 文件打包成zip

1、下载文件到本地

public void download(HttpServletResponse response){
    String filePath ="";//文件路径
    String fileName ="";//文件名称
    // 读到流中
    InputStream inStream = new FileInputStream(filePath);
    // 设置输出的格式
    response.reset();
     response.setContentType("bin");
     response.addHeader("Content-Disposition", "attachment; filename="" + fileName + """);
     IOUtils.copy(inStream, response.getOutputStream());
}

2、java后端下载

方式一：
new URL(fileUrl + item.getcBhFileserver()).openStream()

方法二：
    public Boolean addFile(String url, String id, String fileName) {

        RequestCallback requestCallBack = new RequestCallback() {

            @Override
            public void doWithRequest(ClientHttpRequest request) throws IOException {
                request.getHeaders().add("accept", MediaType.APPLICATION_OCTET_STREAM_VALUE);
            }
        };

        ResponseExtractor<Boolean> responseExtractor = new ResponseExtractor<Boolean>() {

            @Override
            public Boolean extractData(ClientHttpResponse response) throws IOException {
                if (response.getStatusCode() == HttpStatus.OK) {
                    //得到文件流
                    InputStream input = response.getBody();
                    return true;
                }
                return false;
            }
        };
        return restTemplate.execute(url, HttpMethod.GET, requestCallBack, responseExtractor, id);
    }

3、文件打包成zip

public void zipFilesAll() throws Exception {
        String zipPath = "";//zip包路径
        String zipFileName = "";//zip包名称
        File zipFile = new File(zipFileName .toString());

        // 创建 FileOutputStream 对象
        FileOutputStream fileOutputStream = null;
        // 创建 ZipOutputStream
        ZipOutputStream zipOutputStream = null;
        try {
            //创建文件夹
            zipFile = new File(zipPath );
            FileUtils.forceMkdir(zipFile);

            //创建文件
            zipFile = new File(zipFileName .toString());
            if (!zipFile.exists()) {
                zipFile.createNewFile();
            }

            // 实例化 FileOutputStream 对象
            fileOutputStream = new FileOutputStream(zipFileName.toString());
            // 实例化 ZipOutputStream 对象
            zipOutputStream = new ZipOutputStream(fileOutputStream);
            // 创建 ZipEntry 对象
            ZipEntry zipEntry = null;
            for (CL cl: ClList) {
                // 实例化 ZipEntry 对象，源文件数组中的当前文件
                zipEntry = new ZipEntry(tCltjjl.getcClmc() + ".zip");
                zipOutputStream.putNextEntry(zipEntry);
                IOUtils.copy(new FileInputStream(cl.getcPath(), zipOutputStream);
            }
        } catch (Exception e) {
            
        }finally{
             //记得删除文件
        }
    }