使用R下载压缩数据文件,解压并导入.csv [英] Using R to download zipped data file, extract, and import .csv
问题描述
我想使用 R 从网页下载并提取.csv文件。
I am trying to download and extract a .csv file from a webpage using R.
此问题与使用R下载压缩数据文件,解压缩和导入数据。
我无法使解决方案正常工作,但可能是由于我使用的网址。
I cannot get the solution to work, but it may be due to the web address i am using.
我正在尝试从 http://data.worldbank.org/country/united-kingdom下载.csv文件a>(在下载数据下拉列表)
I am trying to download the .csv files from http://data.worldbank.org/country/united-kingdom (under the download data drop down)
使用@ Dirk的解决方案从上面的链接,我试过
Using @Dirk's solution from the link above, i tried
temp <- tempfile()
download.file("http://api.worldbank.org/v2/en/country/gbr?downloadformat=csv",temp)
con <- unz(temp, "gbr_Country_en_csv_v2.csv")
dat <- read.table(con, header=T, skip=2)
unlink(temp)
我通过查看页面源代码获得扩展链接,
I got the extended link by looking at the page source code, which I expect is causing the problems, although it works if i paste it into the address bar.
文件使用正确的Gb下载
The file downloads with the correct Gb
download.file("http://api.worldbank.org/v2/en/country/gbr?downloadformat=csv",temp)
# trying URL 'http://api.worldbank.org/v2/en/country/gbr?downloadformat=csv'
# Content type 'application/zip' length 332358 bytes (324 Kb)
# opened URL
# downloaded 324 Kb
# also tried unzip but get this warning
con <- unzip(temp, "gbr_Country_en_csv_v2.csv")
# Warning message:
# In unzip(temp, "gbr_Country_en_csv_v2.csv") :
# requested file not found in the zip file
但是这些都是我手动下载文件名。
But these are the file names when i manually download them.
我会感谢一些帮助,我错了,谢谢
I'd appreciate some help with where i am going wrong , thanks
我使用Windows 8,R版本3.1.0
I am using Windows 8, R version 3.1.0
推荐答案
为了让您的数据下载和解压缩,您需要设置 mode =wb
In order to get your data to download and uncompress, you need to set mode="wb"
download.file("...",temp, mode="wb")
unzip(temp, "gbr_Country_en_csv_v2.csv")
dd <- read.table("gbr_Country_en_csv_v2.csv", sep=",",skip=2, header=T)
它看起来像默认是w,其中假设一个文本文件。如果它是一个简单的csv文件,这将是好的。但由于它是压缩的,它是一个二进制文件,因此wb。没有wb部分,您根本无法打开zip。
It looks like the default is "w" which assumes a text files. If it was a plain csv file this would be fine. But since it's compressed, it's a binary file, hence the "wb". Without the "wb" part, you can't open the zip at all.
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