无法从List< Functions.Function1< Object，String>>中强制转换列出< String>使用Selenium和stream()Java8从WebElement列表创建列表 [英] Cannot cast from List<Functions.Function1<Object,String>> to List<String> creating a list from list of WebElements using Selenium and stream() Java8
问题描述
我正在尝试读取HTML表，并使用selenium将所有值放入2d列表中.我正在使用streamable在另一个map()方法内创建一个列表.但是在嵌套的collect方法行中出现Cannot cast from List<Functions.Function1<Object,String>> to List<String>错误
I'm trying to read an HTML table and get all the values into a 2d list using selenium. I'm using streamable to create a List inside another map() method. But I get Cannot cast from List<Functions.Function1<Object,String>> to List<String> error at nested collect method's line
+--------+-------+
| r1 v1 | r1 v2 |
+--------+-------+
| r2 v1 | r2 v2 |
+--------+-------+
<html>
<body>
<table>
<tbody>
<tr>
<td>
<div>
<span>r1 v1</span>
</div>
</td>
<td>
<div>
<span>r1 v2</span>
</div>
</td>
</tr>
<tr>
<td>
<div>
<span>r2 v1</span>
</div>
</td>
<td>
<div>
<span>r2 v2</span>
</div>
</td>
</tr>
</tbody>
</table>
</body>
</html>
Java代码:
public List getTableData() {
return webElement
.findElements(By.xpath(".//table/tbody/tr"))
.stream()
.map(row -> {
return row
.findElements(By.xpath(".//td/div/span"))
.stream()
.map(cell -> {
return cell
.getAttribute("innerText");
})
.collect(Collectors.toList()); // : Cannot cast from List<Functions.Function1<Object,String>> to List<String>
})
.collect(Collectors.toList());
}
为什么我会收到此错误?如何使用java streamable在此表之外创建2d列表?
Why am I gettting this error? How can I create a 2d List out of this table using java streamable?
推荐答案
To create a List with the innerText using Java8's stream() and map() you can use the following solution:
-
cssSelector :
List<String> myTexts = new WebDriverWait(driver, 20).until(ExpectedConditions.visibilityOfAllElementsLocatedBy(By.cssSelector("table>tbody tr td span"))).stream().map(element->element.getAttribute("innerHTML")).collect(Collectors.toList());
xpath :
List<String> myTexts = new WebDriverWait(driver, 20).until(ExpectedConditions.visibilityOfAllElementsLocatedBy(By.xpath("//table/tbody//tr//td//span"))).stream().map(element->element.getAttribute("innerHTML")).collect(Collectors.toList());
参考:您可以在以下位置找到一些相关的讨论:
References: You can find a couple of relevant discussions in:
- How to extract the dynamic values of the id attributes of the table elements using Selenium and Java
- How to print all the button texts within the url using Selenium through Java
这篇关于无法从List< Functions.Function1< Object，String>>中强制转换列出< String>使用Selenium和stream()Java8从WebElement列表创建列表的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
