无法执行rsDriver（连接被拒绝）

Question

我不能用Rselenium得到任何好处。这是第一步，也是我的输出：

library(RSelenium)
rD <- rsDriver()
# checking Selenium Server versions:
#   BEGIN: PREDOWNLOAD
# BEGIN: DOWNLOAD
# BEGIN: POSTDOWNLOAD
# checking chromedriver versions:
#   BEGIN: PREDOWNLOAD
# BEGIN: DOWNLOAD
# BEGIN: POSTDOWNLOAD
# checking geckodriver versions:
#   BEGIN: PREDOWNLOAD
# BEGIN: DOWNLOAD
# BEGIN: POSTDOWNLOAD
# checking phantomjs versions:
#   BEGIN: PREDOWNLOAD
# BEGIN: DOWNLOAD
# BEGIN: POSTDOWNLOAD
# [1] "Connecting to remote server"
# Error in checkError(res) : 
#   Undefined error in httr call. httr output: Failed to connect to localhost port 4567: Connection refused
# In addition: Warning message:
#   In rsDriver() : Could not determine server status.

我错过了什么 ？

Answer 1

尝试运行不建议使用的checkForServer()Selenium时，有两种选择：

• 使用rsDriver
• 使用Docker

看到：

RSelenium::checkForServer()
# Error: checkForServer is now defunct. Users in future can find the function in 
# file.path(find.package("RSelenium"), "examples/serverUtils"). The
# recommended way to run a selenium server is via Docker. Alternatively
# see the RSelenium::rsDriver function.

大家似乎 对发生问题rsDriver和码头工人是推荐的选项，所以我们走的这条路：

• 安装码头工人
• 运行它，按要求重新启动计算机
• 通过在命令行中docker pull selenium/standalone-firefox（或chrome代替firefox）或在R中运行来拉取图像shell('docker pull selenium/standalone-firefox')
• 通过在命令行中docker run -d -p 4445:4444 selenium/standalone-firefox或在R中运行来启动服务器shell('docker run -d -p 4445:4444 selenium/standalone-firefox')
• 然后运行remDr <- remoteDriver(remoteServerAddr = "localhost", port = 4445L, browserName = "firefox'")。该文档对虚拟机提出了一些不同的建议，但我无法使其正常工作。

设置了这个，这是我的代码：

shell('docker run -d -p 4445:4444 selenium/standalone-firefox')
remDr <- remoteDriver(remoteServerAddr = "localhost", port = 4445L, browserName = "firefox")
remDr$open()
remDr$navigate("http://www.google.com/ncr")
remDr$getTitle()
# [[1]]
# [1] "Google"

有关更多信息的文档：

• https://cran.r-project.org/web/packages/RSelenium/vignettes/RSelenium-basics.html
• https://cran.r-project.org/web/packages/RSelenium/vignettes/RSelenium-docker.html