Crawl Web data through Rcurl

There are several ways to get data, such as TXT, Excel, curl, database, etc., I prefer curl and database, first introduce the next Rcurl

Load Rcurl Bag
Http://cran.r-project.org/web/packages/RCurl/index.html

Two installation

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1	sudo R CMD INSTALL RCurl_1.95-4.1.tgz

　　

three-Test run

Error, found missing another package, Bitops

Four-Mount Bitops

Http://cran.r-project.org/web/packages/bitops/index.html

Run

sudo R CMD INSTALL bitops_1. 0-6. tgz

Five Install XML packages
What can I do if I see an instance from the Internet that needs this package? Ann Bar

: http://cran.r-project.org/web/packages/XML/index.html
Command Line Input:

sudo R CMD INSTALL xml_3. 98-1.1. tgz

Silly, the name can be directly under R input the install command

Six Rjsonio Packages Installed
Installation failed with r built-in install command, continued after the old-fashioned installation, successfully

Seven example
Get the score for the frozen videos in watercress, with the following code:

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library(RCurl) library(XML) library(RJSONIO) movieScoreapi <- function(x) { api <- "https://api.douban.com/v2/movie/search?q={" url <- paste(api, x, "}", sep = "") res <- getURL(url) reslist <- fromJSON(res) name <- reslist$subjects[[1]]$title score <- reslist$subjects[[1]]$rating$average return(list(name = name, score = score)) } movieScoreapi(‘冰雪奇缘’)

　　

Run successfully