我正在尝试从 R 中受密码保护的网站上抓取数据。四处阅读,似乎 httr 和 RCurl 包是使用密码身份验证抓取的最佳选择(我还研究了 XML 包) .
我要抓取的网站如下(您需要一个免费帐户才能访问完整页面): http://subscribers.footballguys.com/myfbg/myviewprojections.php?projector=2
这是我的两次尝试(用我的用户名替换“用户名”,用我的密码替换“密码”):
#This returns "Status: 200" without the data from the page:
library(httr)
GET("http://subscribers.footballguys.com/myfbg/myviewprojections.php?projector=2", authenticate("username", "password"))
#This returns the non-password protected preview (i.e., not the full page):
library(XML)
library(RCurl)
readHTMLTable(getURL("http://subscribers.footballguys.com/myfbg/myviewprojections.php?projector=2", userpwd = "username:password"))
我查看了其他相关帖子(下面的链接),但无法弄清楚如何将他们的答案应用到我的案例中。
How to use R to download a zipped file from a SSL page that requires cookies
How to webscrape secured pages in R (https links) (using readHTMLTable from XML package)?
Reading information from a password protected site
R - RCurl scrape data from a password-protected site
http://www.inside-r.org/questions/how-scrape-data-password-protected-https-website-using-r-hold
最佳答案
您可以使用 RSelenium。我使用了开发版本,因为您可以在没有 Selenium 服务器的情况下运行 phantomjs
。
# Install RSelenium if required. You will need phantomjs in your path or follow instructions
# in package vignettes
# devtools::install_github("ropensci/RSelenium")
# login first
appURL <- 'http://subscribers.footballguys.com/amember/login.php'
library(RSelenium)
pJS <- phantom() # start phantomjs
remDr <- remoteDriver(browserName = "phantomjs")
remDr$open()
remDr$navigate(appURL)
remDr$findElement("id", "login")$sendKeysToElement(list("myusername"))
remDr$findElement("id", "pass")$sendKeysToElement(list("mypass"))
remDr$findElement("css", ".am-login-form input[type='submit']")$clickElement()
appURL <- 'http://subscribers.footballguys.com/myfbg/myviewprojections.php?projector=2'
remDr$navigate(appURL)
tableElem<- remDr$findElement("css", "table.datamedium")
res <- readHTMLTable(header = TRUE, tableElem$getElementAttribute("outerHTML")[[1]])
> res[[1]][1:5, ]
Rank Name Tm/Bye Age Exp Cmp Att Cm% PYd Y/Att PTD Int Rsh Yd TD FantPt
1 1 Peyton Manning DEN/4 38 17 415 620 66.9 4929 7.95 43 12 24 7 0 407.15
2 2 Drew Brees NO/6 35 14 404 615 65.7 4859 7.90 37 16 22 44 1 385.35
3 3 Aaron Rodgers GB/9 31 10 364 560 65.0 4446 7.94 33 13 52 224 3 381.70
4 4 Andrew Luck IND/10 25 3 366 610 60.0 4423 7.25 27 13 62 338 2 361.95
5 5 Matthew Stafford DET/9 26 6 377 643 58.6 4668 7.26 32 19 34 102 1 358.60
最后,当你完成后关闭 phantomjs
pJS$stop()
如果你想使用像 firefox 这样的传统浏览器(如果你想坚持使用 CRAN 上的版本),你可以使用:
RSelenium::startServer()
remDr <- remoteDriver()
........
........
remDr$closeServer()
代替相关的 phantomjs
调用。
关于xml - 在 R 中抓取受密码保护的网站,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/24723606/