如何等待下载完成使用Webdriver

时间:2014-02-21 09:57:03

标签: java selenium selenium-webdriver

有没有办法等待下载在WebDriver中完成?

基本上,我想验证下载的文件是否正确存储在硬盘驱动器内并验证,需要等到下载完成。如果有人事先知道这种情况,请提供帮助。

4 个答案:

答案 0 :(得分:0)

不是您问题的直接答案,但我希望它会有所帮助。

将文件存储在硬盘驱动器上(计算其MD5)。一旦它是正确的,你可以进一步测试。如果超时后文件不正确,则会失败。

答案 1 :(得分:0)

轮询配置的下载目录以查找缺少部分文件。

以下Chrome的示例代码:

    File destinationDir = new File("blah");

    Map<String, Object> prefs = new HashMap<>();
    prefs.put("download.default_directory", destinationDir.getAbsolutePath());

    DesiredCapabilities desiredCapabilities = DesiredCapabilities.chrome();

    ChromeOptions options = new ChromeOptions();
    options.setExperimentalOption("prefs", prefs);
    desiredCapabilities.setCapability(ChromeOptions.CAPABILITY, options);

    WebDriver webDriver = new ChromeDriver(desiredCapabilities);
    // Initiate download...

    do {
        Thread.sleep(5000L);
    } while(!org.apache.commons.io.FileUtils.listFiles(destinationDir, new String[]{"crdownload"}, false).isEmpty());

答案 2 :(得分:0)

正如Wait for Download to finish in selenium webdriver JAVA

所述
  private void waitForFileDownload(int totalTimeoutInMillis, String expectedFileName) throws IOException {  
            FluentWait<WebDriver> wait = new FluentWait(this.funcDriver.driver)
                                   .withTimeout(totalTimeoutInMillis, TimeUnit.MILLISECONDS)
                                   .pollingEvery(200, TimeUnit.MILLISECONDS);
            File fileToCheck = getDownloadsDirectory()
                               .resolve(expectedFileName)
                               .toFile();

            wait.until((WebDriver wd) -> fileToCheck.exists());

        }


public synchronized Path getDownloadsDirectory(){
        if(downloadsDirectory == null){

            try {
                downloadsDirectory = Files.createTempDirectory("selleniumdownloads_");
            } catch (IOException ex) {
                throw new RuntimeException("Failed to create temporary downloads directory");
            }
        }
        return downloadsDirectory;
    }

然后您可以使用像this这样的库来进行实际的文件处理,以查看文件是否正确存储(这可能意味着比较文件大小,Md5哈希甚至检查Tika实际上可以存储的文件内容做得也好。)

public void fileChecker(){
        waitForFileDownload(20000,"filename_here");

        File file = downloadsDirectory.resolve(expectedFileName).toFile();

        AutoDetectParser parser = new AutoDetectParser();
        parser.setParsers(new HashMap<MediaType, Parser>());

        Metadata metadata = new Metadata();
        metadata.add(TikaMetadataKeys.RESOURCE_NAME_KEY, file.getName());

        try (InputStream stream = new FileInputStream(file)) {
            parser.parse(stream, (ContentHandler) new DefaultHandler(), metadata, new ParseContext());
        }

        String actualHash = metadata.get(HttpHeaders.CONTENT_MD5); 
        assertTrue("There was a hash mismatch for file xyz:",actualHash.equals("expectedHash"));
    }

答案 3 :(得分:-1)

对于小文件,我目前要么使用隐含等待,要么等待我的文件已经下载的JS回调,然后再继续。下面的代码是由另一个人发布在SO上的,我找不到该帖子,所以我不会因此而受到赞扬。

public static void WaitForPageToLoad(IWebDriver driver)         {             TimeSpan timeout = new TimeSpan(0,0,2400);             WebDriverWait wait = new WebDriverWait(driver,timeout);

        IJavaScriptExecutor javascript = driver as IJavaScriptExecutor;
        if (javascript == null)
            throw new ArgumentException("driver", "Driver must support javascript execution");

        wait.Until((d) =>
        {
            try
            {
                string readyState = javascript.ExecuteScript("if (document.readyState) return document.readyState;").ToString();
                return readyState.ToLower() == "complete";
            }
            catch (InvalidOperationException e)
            {
                //Window is no longer available
                return e.Message.ToLower().Contains("unable to get browser");
            }
            catch (WebDriverException e)
            {
                //Browser is no longer available
                return e.Message.ToLower().Contains("unable to connect");
            }
            catch (Exception)
            {
                return false;
            }
        });
    }

如果文件很小,它应该等待你的文件完成。不幸的是,我没有在较大的文件(> 5MB)上测试这个