java实现下载文件到默认浏览器路径

 @GetMapping("/download")
 public void download(HttpServletResponse response) {
         return this.downloadFile(response);
    }
public void downloadFile(HttpServletResponse response, InputStream inputStream, String fileName, String contentType) {
        try (BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream())) {
            //通知浏览器以附件形式下载
            response.setHeader("Content-Disposition", String.format("attachment; filename=\"%s\"", fileName));
            //文件输出格式
            response.setContentType(contentType);
            byte[] car = new byte[1024];
            int len;
            while ((len = inputStream.read(car)) != -1) {
                out.write(car, 0, len);
            }
        } catch (IOException e) {
            log.error("Method:downloadFile,ErrorMsg:{}", e.getMessage());
        }
    }

// 1.设置驱动路径（驱动在 target 文件夹中）
System.setProperty("webdriver.chrome.driver", this.getClass().getResource("/").getPath() + "drivers/chromedriver.exe");

// 2.新的下载地址为桌面（可以弄成某个文件夹路径而不要直接弄成死的静态路径）
String downloadPath = "C:\\Users\\XXX\\Desktop";

// 3.HashMap 中保存下载地址信息
HashMap<String, Object> hashMap = new HashMap<>();
hashMap.put("download.default_directory", downloadPath);

// 4.ChromeOptions 中设置下载路径信息，需要传入保存有下载路径的 HashMap
ChromeOptions chromeOptions = new ChromeOptions();
chromeOptions.setExperimentalOption("prefs", hashMap);

// 依据 ChromeOptions 来产生 DesiredCapbilities，这时 DesiredCapbilities 就也具备了下载路径的信息了
DesiredCapabilities desiredCapabilities = new DesiredCapabilities();
desiredCapabilities.setCapability(ChromeOptions.CAPABILITY, chromeOptions);

// 5.依据 ChromeOptions 产生驱动，此时的 driver 已经具备了新的下载路径的
WebDriver driver = new ChromeDriver(desiredCapabilities );