springmvc 导出zip文件(通过http跳转)

最新推荐文章于 2021-12-10 16:47:32 发布

原创最新推荐文章于 2021-12-10 16:47:32 发布 · 905 阅读

2 ·

CC 4.0 BY-SA版权

文章标签：

#spring导出 #RestTemplate #http请求

Java 同时被 2 个专栏收录

106 篇文章

订阅专栏

Spring

7 篇文章

订阅专栏

本文介绍了一种跨项目文件导出的方法，通过RESTful API从多台服务器上获取特定日期的资源文件，并详细展示了如何使用Spring框架的RestTemplate进行POST请求，实现文件的下载和错误处理。

A项目  调用B项目所在的N台服务器获取文件 
//resource.play.export.urls=http://192.168.6.27:8980/,http://192.168.2.69:8080/    
    @Value("#{'${resource.play.export.urls}'.split(',')}")
    private String[] resourcePlayExprtUrls;

     @RequestMapping(value = "/exportResourcePlayByDay/{day}", method = RequestMethod.GET)
    public void exportResourcePlayByDay(HttpServletResponse response, @PathVariable("day") int day) {
        RestTemplate template = new RestTemplate();
        ResponseEntity<Resource> entity;
        String url = null;
        for (int i = 0; i < resourcePlayExprtUrls.length; i++) {
            try {
                url = resourcePlayExprtUrls[i] + "projectname/style/exportResourcePlayByDay/" + day;
                entity = template.postForEntity(url, null, Resource.class);
                if (entity.getStatusCode().value() == HttpStatus.OK.value()) {
                    InputStream in = entity.getBody().getInputStream();
                    byte[] bytes = new byte[in.available()];
                    in.read(bytes);
                    List<String> strings = entity.getHeaders().get("exportFilename");
                    if (!CollectionUtils.isEmpty(strings)) {
                        response.addHeader("Content-Disposition", "attachment;filename=" + (strings.get(0)));
                    }
                    response.getOutputStream().write(bytes);
                    return;
                }
            } catch (Exception e) {
                logger.error("export resource play statistics data error,url={}", url, e);
            }
        }
        try {
            response.getOutputStream().write("no data".getBytes("UTF-8"));
        } catch (IOException e) {
            logger.error(" response.getOutputStream() error", e);
        }
    }

B项目(N台服务器,待导出的文件在其中的一台,改服务没有返回HttpStatus.NO_CONTENT)
@RequestMapping(value = "/exportResourcePlayByDay/{day}", method = RequestMethod.POST)
    public void exportResourcePlayByDay(HttpServletResponse response, @PathVariable("day") int day) {
        long start = ServiceCommonUtil.getBeforeDateStartTimeStamp(day);
        long end = ServiceCommonUtil.getBeforeDateEndTimeStamp(day);
        FilenameFilter fileFilter = (File file, String name) -> {
            if (name.contains(fileNamePre) && name.endsWith(".zip")) {
                String[] splits = name.split("-");
                if (splits[0].matches("\\d+")) {
                    Long time = Long.parseLong(splits[0]);
                    if (start <= time && end >= time) {
                        return true;
                    }
                }
            }
            return false;
        };
        File file;
        if (StringUtils.isEmpty(exportFileath)) {
            file = new File(environment.getProperty("java.io.tmpdir"));
        } else {
            file = new File(exportFileath);
        }
        File[] files = file.listFiles(fileFilter);
        if (files != null && files.length > 0) {
            try {
                response.addHeader("exportFilename", (files[0].getName()));
                response.getOutputStream().write(FileUtils.readFileToByteArray(files[0]));
            } catch (Exception e) {
                logger.error("this server get export file succes ,but send to call(center) error,filename={}", files[0], e);
            }
        } else {
            logger.info("this server not have export file");
            response.setStatus(HttpStatus.NO_CONTENT.value());
            return;
        }
    }