Selenium，无法自动下载文件，下载确认一直显示

Question

我正在研究其他人的代码，该代码应该使用 selenium 从网页自动下载 PDF 文件，

我不断收到 firefox 下载确认提示，即使 browser.helperApps.neverAsk.saveToDisk 属性包含 PDF mime 类型。

我正在使用 Selenium 3.12.0 我将我的 Firefox 版本从 70 降级到 60.0，两者都不起作用。我不确定是代码问题还是 selenium firefox 兼容问题。

感谢您的帮助。

编辑：这是下载确认弹出窗口的样子。

private static final String mimeTypeToSaveToDisk = "application/pdf;application/zip";

public void download(String url, String downloadDirPath) {          
    // FirefoxProfile           
    FirefoxProfile profile = new FirefoxProfile();
    profile.setAcceptUntrustedCertificates(true);
    profile.setAssumeUntrustedCertificateIssuer(false);
    profile.setPreference("browser.download.folderList", 2);
    profile.setPreference("browser.download.dir", downloadDirPath);     
    profile.setPreference("browser.helperApps.neverAsk.saveToDisk", mimeTypeToSaveToDisk);
    profile.setPreference("browser.helperApps.alwaysAsk.force", false);
    profile.setPreference("browser.download.manager.showWhenStarting", false);
    profile.setPreference("browser.download.manager.closeWhenDone", true);

    // FirefoxOptions
    FirefoxOptions firefoxOptions = new FirefoxOptions();               
    firefoxOptions.setCapability(FirefoxDriver.PROFILE, profile);
    firefoxOptions.setCapability(CapabilityType.ACCEPT_SSL_CERTS, true);
    // firefoxOptions.setBinary("C:/PathTo/firefox.exe");

    // PROXY
    if(!StringUtil.isNullOrEmpty(EmailProperties.getProxyHost(null))){
        String PROXY_URL = EmailProperties.getProxyHost(null)+":"+ EmailProperties.getProxyPort(null);
        Proxy PROXY = new Proxy();
        PROXY.setHttpProxy(PROXY_URL).setFtpProxy(PROXY_URL).setSslProxy(PROXY_URL);
        firefoxOptions.setCapability(CapabilityType.PROXY, PROXY);
    }

    WebDriver driver = new FirefoxDriver(firefoxOptions);
    driver.get(url);

    ExpectedCondition<Boolean> expectedCondition = new ExpectedCondition<Boolean>() {
        @Override
        public Boolean apply(WebDriver driver) {
            return ((JavascriptExecutor) driver).executeScript("return document.readyState").toString().equals("complete");
        }
    };

    try {
        Thread.sleep(timeSleep * 1000);
        WebDriverWait wait = new WebDriverWait(driver, timeOut);
        wait.until(expectedCondition);
    } catch (Throwable e) {
        logger.error("Timeout waiting for Page Load Request to complete.", e);
    }

    By by = By.xpath("//a[starts-with(@id, 'file_')]");
    List<WebElement> elements = driver.findElements(by);
    for (int Counter = 0; Counter < elements.size(); Counter++) {
        elements.get(Counter).click();
    }

    try {
        File downloadFile [] = null;
        int nbSleep = 0;
        while(nbSleep <= 10 && (downloadFile == null || downloadFile.length>0)){
            logger.debug("Téléchargement ZIP non finalisé, on attend "+((nbSleep+1)*timeSleep * 1000)+" secondes ...");
            Thread.sleep(timeSleep * 1000);
            nbSleep++;              
            downloadFile = new File(downloadDirPath).listFiles(
                    new FilenameFilter(){           
                        @Override
                        public boolean accept(File dir, String name) {
                            return name.endsWith(".part");
                        }
                    }
                );
        }

        if(downloadFile == null || downloadFile.length>0){
            logger.error("Téléchargement ZIP non finalisé après attente de "+((nbSleep+1)*timeSleep * 1000)+" secondes ...");
        }
    } catch (Throwable e) {
        logger.error("Timeout waiting for Page Load Request to complete.", e);
    }
    driver.quit();
}

Answer 1

我看到您正在使用的FirefoxOptions，并想推荐另一个尝试-useDownloadDir 选项。我知道你已经使用了browser.download.dir，但这是一个不同的设置：

FirefoxOptions options = new FirefoxOptions();
options.setPreference("browser.download.folderList", 2);
options.setPreference("browser.download.dir", "C:\\Windows\\temp");
options.setPreference("browser.download.useDownloadDir", true);
options.setPreference("browser.helperApps.neverAsk.saveToDisk", "application/pdf");
options.setPreference("pdfjs.disabled", true);  // prevent PDF from opening after download

WebDriver driver = new FirefoxDriver(options);