在微服務(wù)項(xiàng)目中，我經(jīng)常會(huì)碰到從一個(gè)微服務(wù)項(xiàng)目轉(zhuǎn)發(fā)下載請(qǐng)求并實(shí)現(xiàn)下載文件的需求，因此在此做一個(gè)轉(zhuǎn)發(fā)下載的示例?？偟南螺d轉(zhuǎn)發(fā)流程如下，我會(huì)按照這個(gè)流程一一介紹下載流程。

?

?1、客戶端的下載請(qǐng)求

這里主要介紹controller層是如何接收客戶端發(fā)送請(qǐng)求的代碼,接收參數(shù)的代碼如下

@GetMapping(value = "downloadFile")
public void downloadFile( HttpServletResponse response) {


}

2、轉(zhuǎn)發(fā)服務(wù)器的下載請(qǐng)求

轉(zhuǎn)發(fā)服務(wù)器的下載請(qǐng)求主要通過Feign接口實(shí)現(xiàn)，具體實(shí)現(xiàn)代碼如下：

Feign接口：

    @PostMapping(value = "/downloadFile")
    Response downloadFile();

Feign接口實(shí)現(xiàn)類：

    @Override
    public Response downloadFile() {
        return null;
    }

之后便可以利用Feign實(shí)現(xiàn)轉(zhuǎn)發(fā)了controller層代碼完善如下：

@GetMapping(value = "downloadFile")
public void downloadFile( HttpServletResponse response) {

        InputStream inputStream = null;
        try {
            Response serviceResponse = queryBranchService.downloadFile(url,sapNo);
        } catch (IOException e) {
            e.printStackTrace();
        }

}

3、最終服務(wù)器的下載請(qǐng)求響應(yīng)

該代碼的總體思路就是將文件變成輸出流并寫在響應(yīng)中，并返回給轉(zhuǎn)發(fā)服務(wù)器。

    @GetMapping(value = "downloadFile")
    public void downloadFile(HttpServletResponse response) {
        //獲取upload文件夾的路徑
        try {
            InputStream contentInput = OkHttpClientUtils.getImage(url, null);
            BufferedInputStream bufferedInputStream = new BufferedInputStream(contentInput);
            response.setHeader("Content-Disposition", "attachment; filename=" + URLEncoder.encode(sapNo+".png", "UTF-8"));
            BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(response.getOutputStream());
            int length = 0;
            byte[] temp = new byte[1024 * 10];
            while ((length = bufferedInputStream.read(temp)) != -1) {
                bufferedOutputStream.write(temp, 0, length);
            }
            bufferedOutputStream.flush();
            bufferedOutputStream.close();
            bufferedInputStream.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
            log.error(e.getMessage());
        } catch (IOException e) {
            e.printStackTrace();
            log.error(e.getMessage());
        }
    }

4、轉(zhuǎn)發(fā)服務(wù)器的下載請(qǐng)求響應(yīng)

對(duì)轉(zhuǎn)發(fā)服務(wù)器的controller層再繼續(xù)完善，完善的總思路拿到中轉(zhuǎn)服務(wù)器的響應(yīng)，并拿出響應(yīng)中輸入流再變成輸出流回寫給客戶端文章來源地址http://www.zghlxwxcb.cn/news/detail-422120.html

@GetMapping(value = "downloadFile")
public void downloadFile( HttpServletResponse response) {

        InputStream inputStream = null;
        try {
                   InputStream inputStream = null;
        try {
            Response serviceResponse = queryBranchService.downloadFile();
            Response.Body body = serviceResponse.body();
            inputStream = body.asInputStream();
            BufferedInputStream bufferedInputStream = new BufferedInputStream(inputStream);
            response.setHeader("Content-Disposition", serviceResponse.headers().get("Content-Disposition").toString().replace("[", "").replace("]", ""));
            BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(response.getOutputStream());
            int length = 0;
            byte[] temp = new byte[1024 * 10];
            while ((length = bufferedInputStream.read(temp)) != -1) {
                bufferedOutputStream.write(temp, 0, length);
            }
            bufferedOutputStream.flush();
            bufferedOutputStream.close();
            bufferedInputStream.close();
            inputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        } catch (IOException e) {
            e.printStackTrace();
        }

}

到了這里，關(guān)于SpringBoot微服務(wù)項(xiàng)目，轉(zhuǎn)發(fā)并響應(yīng)下載請(qǐng)求的文章就介紹完了。如果您還想了解更多內(nèi)容，請(qǐng)?jiān)谟疑辖撬阉鱐OY模板網(wǎng)以前的文章或繼續(xù)瀏覽下面的相關(guān)文章，希望大家以后多多支持TOY模板網(wǎng)！