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 );