blocks|key|4641738|text|你的文件存储在某个地方，对吧？因此，请检查它是否存在于文件系统中|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4641739|File+f+=+new+File(filePathString);

do+{
++Thread.sleep(3000);
}+while+(f.exists()+&&+f.length()+==+expectedSizeInBytes)|code-block|syntax|javascript|4641740|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Well, your file is stored somewhere, right? So, check if it exists in file system 

<pre><code>File f = new File(filePathString);

do {
 Thread.sleep(3000);
} while (f.exists() &amp;&amp; f.length() == expectedSizeInBytes)
</code></pre>

blocks|key|4641766|text|某些操作系统(例如Mac+OS+X)在下载完成之前不会设置文件名。因此，使用wait或while循环检查文件是否存在似乎就足够了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4641767|例如：|4641768|File+file+=+new+File(fullPathToFile);
while+(!file.exists())+{
++++Thread.sleep(1000);
}|code-block|syntax|javascript|4641769|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Some operating systems (e.g. Mac OS X) don't set the filename until the download is complete. So it seems sufficient to use a wait or a while loop to check for the file to exist.

e.g.

<pre><code>File file = new File(fullPathToFile);
while (!file.exists()) {
 Thread.sleep(1000);
}
</code></pre>

blocks|key|4641825|text|do+{

+++filesize1+=+f.length();++//+check+file+size
+++Thread.sleep(5000);++++++//+wait+for+5+seconds
+++filesize2+=+f.length();++//+check+file+size+again

}+while+(filesize1+!=+filesize2);+|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|4641826|其中f为文件，文件大小为长|unstyled|4641827|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>do {

 filesize1 = f.length(); // check file size
 Thread.sleep(5000); // wait for 5 seconds
 filesize2 = f.length(); // check file size again

} while (filesize1 != filesize2); 
</code></pre>
where f is a File, filesize is long

blocks|key|4641857|text|有点晚了，但这个问题有很多观点，我认为如果你还没有继续前进或者其他人遇到了这个问题，花点时间来回答它是值得的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4641858|我也遇到了同样的问题，我想我应该分享一下。我当时正在用python开发，但同样的概念也适用。您不必使用selenium进行实际的下载。您应该考虑检索链接并使用内置函数从那里继续，而不是单击元素开始下载。|4641859|通常单击开始下载的元素应该有一个'href‘属性，您应该能够使用selenium读取该属性。这是指向实际文件的url。在python中，它看起来像这样：|4641860|++++element+=+driver.find_element_by_id('dl_link')
++++url+=+element.get_attribute('href')|code-block|syntax|javascript|4641861|在这里，您可以使用http库来调用url。这里最重要的部分是您将'stream‘设置为true，这样您就可以开始将字节写入文件。确保文件路径包含正确的文件扩展名，另外，大多数操作系统不允许您使用某些字符命名文件，如反斜杠或引号，因此请注意这一点。|4641862|def+download_file(url,+file_path):
++++from+requests+import+get
++++reply+=+get(url,+stream=True)
++++with+open(file_path,+'wb')+as+file:
++++++++for+chunk+in+reply.iter_content(chunk_size=1024):+
++++++++++++if+chunk:
++++++++++++++++file.write(chunk)|4641863|在下载完成之前，程序不应该继续运行，因此在下载完成之前，不再需要轮询。|4641864|我很抱歉用一种不同的语言回答，我相信你可以用Java来使用HttpURLConnection。希望这能有所帮助！|4641865|entityMap^0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|Y|8|@]|9|@]|A|$]]|$1|M|3|N|5|H|7|Z|8|@]|9|@]|A|$I|J]]|$1|O|3|P|5|6|7|10|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|11|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

A little late but this question has a good number of views, I thought it would be worth the time to answer it in case you haven't moved on or someone else comes across it. 

I too ran into the same problem and thought I'd share. I was developing in python at the time but the same concept applies. You don't have to do the actual download using selenium. Rather than clicking on the element to start the download, you should consider retrieving the link and using built in functions to proceed from there. 

The element you would normally click to begin the download should have a 'href' attribute that you should be able to read using selenium. This is the url pointing to the actual file. In python, it looks something like this:

<pre><code> element = driver.find_element_by_id('dl_link')
 url = element.get_attribute('href')
</code></pre>

From here you can use an http library to call the url. The important part here is that you set 'stream' to true so you can begin writing the bytes to a file. Make sure the file path contains the correct file extension and another thing, most operating systems don't allow you to name files with certain characters such as back slashes or quotations so heads up on that. 

<pre><code>def download_file(url, file_path):
 from requests import get
 reply = get(url, stream=True)
 with open(file_path, 'wb') as file:
 for chunk in reply.iter_content(chunk_size=1024): 
 if chunk:
 file.write(chunk)
</code></pre>

The program shouldn't continue until the download is complete making it no longer necessary to poll until it is complete. 

I apologize for answering in a different language, in Java I believe you can use the HttpURLConnection API. Hope this helps!

blocks|key|135222|text|我使用Scala实现自动化，但是到Java的移植应该很简单，因为我在那里使用的是java+Selenium类。所以，首先你需要的是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|135223|import+com.google.common.base.Function
import+java.nio.file.{Files,+Paths,+Path}

def+waitUntilFileDownloaded(timeOutInMillis:Int)={
++++val+wait:FluentWait[Path]+=+new+FluentWait(Paths.get(downloadsDir)).withTimeout(timeOutInMillis,+TimeUnit.MILLISECONDS).pollingEvery(200,+TimeUnit.MILLISECONDS)
++++wait.until(
++++++new+Function[Path,+Boolean]+{
++++++++override+def+apply(p:Path):Boolean+=+Files.list(p).iterator.asScala.size+>+0
++++++}
++++)
++}|code-block|syntax|javascript|135224|然后，在我需要下载xls文件的测试套件中，我只有以下内容：|135225|def+exportToExcel(implicit+driver:+WebDriver)+=+{
++++click+on+xpath("//div[contains(@class,+'export_csv')]")
++++waitUntilFileDownloaded(2000)
++}|135226|我希望你已经有了这个想法。FluentWait是一个非常有用的抽象，虽然它是Selenium的一部分，但在满足某些条件之前，您可以在任何需要等待轮询的地方使用它。|135227|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I use Scala for my automation but the port to Java should be trivial since I use java Selenium classes there anyway.
So, first you need this:

<pre><code>import com.google.common.base.Function
import java.nio.file.{Files, Paths, Path}

def waitUntilFileDownloaded(timeOutInMillis:Int)={
 val wait:FluentWait[Path] = new FluentWait(Paths.get(downloadsDir)).withTimeout(timeOutInMillis, TimeUnit.MILLISECONDS).pollingEvery(200, TimeUnit.MILLISECONDS)
 wait.until(
 new Function[Path, Boolean] {
 override def apply(p:Path):Boolean = Files.list(p).iterator.asScala.size &gt; 0
 }
 )
 }
</code></pre>

Then in my test suite where I need to download xls file I just have this:

<pre><code>def exportToExcel(implicit driver: WebDriver) = {
 click on xpath("//div[contains(@class, 'export_csv')]")
 waitUntilFileDownloaded(2000)
 }
</code></pre>

I hope you've got the idea. FluentWait is very useful abstraction and though it is a part of Selenium it can be used wherever you need to wait with polling till some condition is met.

blocks|key|4641947|text|对Alexander+Arendar的想法进行了java改编：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4641948|(使用Java8&FluentWait的until方法的谓词版本)|4641949|++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;
++++}|code-block|syntax|javascript|4641950|请注意，使用createTempDirectory可以避免递归删除超出预期的内容，并在我们处理完文件夹后自动安全地处理它。|4641951|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

A java adaptation of Alexander Arendar's idea :

(using Java 8 &amp; the predicate version of until method of FluentWait) 

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

 wait.until((WebDriver wd) -&gt; 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;
 }
</code></pre>

Note the use of createTempDirectory to avoid the caveats of recursively deleting more than intended as well as automatically safely disposing of the folder when we re done with it.

blocks|key|4641977|text|我喜欢渴望|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4641978|++++Path+filePath+=+Paths.get(".",+"filename");
++++await().atMost(1,+MINUTES)
++++++++++++.ignoreExceptions()
++++++++++++.until(()+->+filePath.toFile().exists());|code-block|syntax|javascript|4641979|更多信息：http://www.testautomationguru.com/selenium-webdriver-how-to-wait-for-expected-conditions-using-awaitility/|offset|length|4641980|entityMap|0|LINK|mutability|MUTABLE|url|http://www.testautomationguru.com/selenium-webdriver-how-to-wait-for-expected-conditions-using-awaitility/^0|0|0|5|2Y|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

I like awaitility

<pre><code> Path filePath = Paths.get(".", "filename");
 await().atMost(1, MINUTES)
 .ignoreExceptions()
 .until(() -&gt; filePath.toFile().exists());
</code></pre>

More info : <a href="http://www.testautomationguru.com/selenium-webdriver-how-to-wait-for-expected-conditions-using-awaitility/" rel="nofollow noreferrer">http://www.testautomationguru.com/selenium-webdriver-how-to-wait-for-expected-conditions-using-awaitility/</a>

blocks|key|135318|text|下面的代码对我来说工作得很好。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|135319|同样，不会出现任何警告，因为我按照建议使用了泛型类型和Duration。|offset|length|style|CODE|135320|File+file+=+new+File("C:\\chromedriver_win32.zip");
FluentWait<WebDriver>+wait+=+new+FluentWait<WebDriver>(driver).withTimeout(Duration.ofSeconds(25)).pollingEvery(Duration.ofMillis(100));
wait.until(+x+->+file.exists());|code-block|syntax|javascript|135321|entityMap^0|0|R|8|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@$D|Q|E|R|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|S|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

The below code is working fine for me.
Also no warning will be as I used generic type and <code>Duration</code> as recommended.
<pre><code>File file = new File(&quot;C:\\chromedriver_win32.zip&quot;);
FluentWait&lt;WebDriver&gt; wait = new FluentWait&lt;WebDriver&gt;(driver).withTimeout(Duration.ofSeconds(25)).pollingEvery(Duration.ofMillis(100));
wait.until( x -&gt; file.exists());
</code></pre>

blocks|key|4642026|text|import+time
from+os+import+walk

download_dir+=+'path\\to\\download\\folder'


def+check_if_download_folder_has_unfinished_files():
++++for+(dirpath,+dirnames,+filenames)+in+walk(download_dir):
++++++++return+str(filenames)


def+wait_for_files_to_download():
++++time.sleep(5)++#+let+the+driver+start+downloading
++++file_list+=+check_if_download_folder_has_unfinished_files()
++++while+'Unconfirmed'+in+file_list+or+'crdownload'+in+file_list:
++++++++file_list+=+check_if_download_folder_has_unfinished_files()
++++++++time.sleep(1)


if+__name__+==+'__main__':
++++wait_for_files_to_download()|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|4642027|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>import time
from os import walk

download_dir = 'path\\to\\download\\folder'


def check_if_download_folder_has_unfinished_files():
 for (dirpath, dirnames, filenames) in walk(download_dir):
 return str(filenames)


def wait_for_files_to_download():
 time.sleep(5) # let the driver start downloading
 file_list = check_if_download_folder_has_unfinished_files()
 while 'Unconfirmed' in file_list or 'crdownload' in file_list:
 file_list = check_if_download_folder_has_unfinished_files()
 time.sleep(1)


if __name__ == '__main__':
 wait_for_files_to_download()
</code></pre>

blocks|key|135333|text|这个方法对我很有效：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|135334|++++Path+filePath+=+Paths.get("path/to/file/fileName.pdf");
++++File+file+=+filePath.toFile();+

+void+waitForFileDownloaded(File+file,+int+timeoutSeconds)+{
++++++++WebDriver+driver+=+getDriver();
++++++++FluentWait<WebDriver>+wait+=+new+FluentWait<>(driver)
++++++++++++++++.withTimeout(Duration.ofSeconds(timeoutSeconds))
++++++++++++++++.pollingEvery(Duration.ofMillis(500))
++++++++++++++++.ignoring(NoSuchElementException.class,+StaleElementReferenceException.class);
++++++++wait.until((webDriver)+->+file.exists());
++++}|code-block|syntax|javascript|135335|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This one worked for me:

<pre><code> Path filePath = Paths.get("path/to/file/fileName.pdf");
 File file = filePath.toFile(); 

 void waitForFileDownloaded(File file, int timeoutSeconds) {
 WebDriver driver = getDriver();
 FluentWait&lt;WebDriver&gt; wait = new FluentWait&lt;&gt;(driver)
 .withTimeout(Duration.ofSeconds(timeoutSeconds))
 .pollingEvery(Duration.ofMillis(500))
 .ignoring(NoSuchElementException.class, StaleElementReferenceException.class);
 wait.until((webDriver) -&gt; file.exists());
 }
</code></pre>

blocks|key|135350|text|此代码将始终有效。伙计们，试试吧！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|135351|public+void+waitForFileDownloaded(String+fileName,+int+timeoutSeconds)+{
++++FluentWait<WebDriver>+wait+=+new+FluentWait<>(driver)
++++++++++++.withTimeout(Duration.ofSeconds(timeoutSeconds))
++++++++++++.pollingEvery(Duration.ofMillis(500))
++++++++++++.ignoring(NoSuchElementException.class,+StaleElementReferenceException.class);
++++wait.until((x)+->+{
++++++++File[]+files+=+new+File(downloadfolderPath).listFiles();
++++++++for+(File+file+:+files)+{
++++++++++++if+(file.getName().contains(fileName))+{
++++++++++++++++return+true;
++++++++++++}
++++++++}
++++++++return+false;
++++});
}|code-block|syntax|javascript|135352|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This code will always work.. Try it out guys!
<pre><code>public void waitForFileDownloaded(String fileName, int timeoutSeconds) {
 FluentWait&lt;WebDriver&gt; wait = new FluentWait&lt;&gt;(driver)
 .withTimeout(Duration.ofSeconds(timeoutSeconds))
 .pollingEvery(Duration.ofMillis(500))
 .ignoring(NoSuchElementException.class, StaleElementReferenceException.class);
 wait.until((x) -&gt; {
 File[] files = new File(downloadfolderPath).listFiles();
 for (File file : files) {
 if (file.getName().contains(fileName)) {
 return true;
 }
 }
 return false;
 });
}
</code></pre>

blocks|key|135360|text|下面是一个仅使用WebDriverWait的示例：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|135361|new+WebDriverWait(driver,+60).until(d+->+Paths.get(downloadDir,+downloadFileName).toFile().exists());|code-block|syntax|javascript|135362|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Here's one using just WebDriverWait:
<pre><code>new WebDriverWait(driver, 60).until(d -&gt; Paths.get(downloadDir, downloadFileName).toFile().exists());
</code></pre>

blocks|key|135391|text|我是你用Python+%2B+Firefox编写的下面的代码，但它可以改编成Java：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|135392|browser.get('about:downloads')++#Open+the+download+page.
#+WAit+all+icons+change+from+"X"+(cancel+download)
WebDriverWait(browser,+URL_LOAD_TIMEOUT+*+40).until_not(
++++EC.presence_of_element_located((By.CLASS_NAME,+'downloadIconCancel')))|code-block|syntax|javascript|135393|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I am your the bellow code in Python + Firefox, but it can be adapted to Java:
<pre class="lang-py prettyprint-override"><code>browser.get('about:downloads') #Open the download page.
# WAit all icons change from &quot;X&quot; (cancel download)
WebDriverWait(browser, URL_LOAD_TIMEOUT * 40).until_not(
 EC.presence_of_element_located((By.CLASS_NAME, 'downloadIconCancel')))
</code></pre>

Once clicking a download button, files will be downloaded. Before executing next code, it needs to wait until the download completes.

My code looks like this:

<pre><code>Thread.sleep(2000);
driver.findElement(By.xpath("//*[@id='perform']")).click();//click for download

Thread.sleep(20000);
//code to be executed after download completes
Readfile fileobj=new Readfile();
String checkfile=fileobj.checkfilename();
</code></pre>

How can I make the webdriver wait until a download completes?

Wait for Download to finish in selenium webdriver JAVA

文件存储

文件系统

Python

Java

单击下载按钮后，文件将被下载。在执行下一段代码之前，它需要等待下载完成。我的代码如下所示：Thread.sleep(2000);driver.findElement(By.xpath("//*[@id='perform']")).click();//click for downloadThread.sleep(2000...

问在selenium webdriver JAVA中等待下载完成
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