Question

我想通过下载链接下载带有R的日志文件，但我只获得未评估的html。

这是我尝试过的，没有任何成功：

url = "http://statcounter.com/p7447608/csv/download_log_file?ufrom=1323783441&uto=1323860282"

# SSL-certificate:
CAINFO = paste(system.file(package="RCurl"), "/CurlSSL/ca-bundle.crt", sep = "")

curlH = getCurlHandle(
    header = FALSE,
    verbose = TRUE,
    netrc = TRUE,
    maxredirs = as.integer(20),
    followlocation = TRUE,
    userpwd = "me:mypassw",
    ssl.verifypeer = TRUE)

setwd(tempdir())
destfile = "log.csv"
x = getBinaryURL(url, curl = curlH,
                 cainfo = CAINFO) 

shell.exec(dir())

Answer 1

以下是两种下载文件的方法。

似乎在将文件重命名为log.html并打开它时，我们的登录信息无效。这就是你得到html结构的原因。您需要将登录凭据添加到URL。

您可以从html源代码中获取名称值对：

<label for="username2">Username:</label>
<input type="text" id="username2" name="form_user" value="" size="12" maxlength="64" class="large">
<span class="label-overlay">
<label for="password2">Password:</label>
<input type="password" name="form_pass" id="password2" value="" size="12" maxlength="64" class="large">

正如您所看到的，用户名的名称值对称为form_user = USERNAME，密码的名称值对称为form_pass = PASSWORD。

这就是curl userpwd设置不起作用的原因，它无法识别id或名称。

 ## Url for downloading - Does not contain login credentials.
 url <- "http://statcounter.com/p7447608/csv/download_log_file?ufrom=1323783441&uto=1323860282" 

 USERNAME = 'your username'
 PASSWORD = 'your password'

 ## Url for downloading - Does contain login credentials. Use this one!! 
 url <- paste( 'http://statcounter.com/p7447608/csv/download_log_file?ufrom=1323783441&uto=1323860282&form_user=', USERNAME, '&form_pass=', PASSWORD, sep = '') 


 ## method one, using download file
 download.file(url, destfile = "log.csv" )

 csv.data <- read.csv("log.csv" )
 head(csv.data)

 ## method 2 using curl
 CAINFO = paste(system.file(package="RCurl"), "/CurlSSL/ca-bundle.crt", sep = "")

 cookie = 'cookiefile.txt'
 curlH = getCurlHandle(
 cookiefile = cookie,
 useragent =  "Mozilla/5.0 (Windows; U; Windows NT 5.1; en - US; rv:1.8.1.6) Gecko/20070725 Firefox/2.0.0.6",
     header = FALSE,
     verbose = TRUE,
     netrc = TRUE,
     maxredirs = as.integer(20),
     followlocation = TRUE,
     ssl.verifypeer = TRUE)


 destfile = "log2.csv"
 content = getBinaryURL(url, curl = curlH, cainfo = CAINFO)
 ## write to file
 writeBin(content, destfile)
 ## read from binary object
 csv.data2 <- read.csv(textConnection(rawToChar(content)))
 head(csv.data2)
 csv.data2 == csv.data

Answer 2

您似乎不需要SSL证书等，因为网址为http:，而不是https: ...所以在这种情况下，download.file(url, "log.csv")可能会正常工作吗？

我首先要确保网址及其响应在R之外是正确的。

...我使用Chrome访问该网址并获得了一个下载文件“StatCounter-Log-7447608.csv”。它包含一个csv头和 HTML ?!

"Date and Time","IP Address","IP Address Label","Browser","Version","OS","Resolution","Country","Region","City","Postal Code","ISP","Returning Count","Page URL","Page Title","Came From","SE Name","SE Host","SE Term"
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="Author" content="StatCounter">
...

通过R Console从Web下载文件

2 个答案: