vlambda博客
学习文章列表

library("xml2")library("rvest")library("dplyr")library("stringr")library(xlsx)

data <- data.frame()#创建数据框a<-read.xlsx("CFH.xlsx",1)#读取文件，第一列为植物的代号d<-a[,1]for (i in 1:length(d)) {site <- paste("http://www.cfh.ac.cn/",d[i],".sp",sep="")#每一个植物d额网址file <- paste("./",d[i],".xml",sep="")JudgeXML<-try(download.file(site, destfile = file, quiet = TRUE),silent=TRUE)if(JudgeXML==0){#判断是否存在植物信息，未存在则跳过web <- readLines(site,encoding="UTF-8")#第一种从网址获取数据的方法web1 <- read_html(site, encoding = "UTF-8")#第二种从网址获取数据的方法Title <- web1%>%html_nodes("title")%>%html_text()#便于判断是否包含植物信息if(Title=="未找到物种信息"){}else{SpLatinName <- str_extract_all(string = web, pattern = "<span class='SpLatinName' level='Species'>.+</span>")#判定该条植物信息是界门纲目科属种等SpLatinName <- unlist(SpLatinName)level="Species"if(length(SpLatinName)==0){SpLatinName <- str_extract_all(string = web, pattern = "<span class='SpLatinName' level='Genus'>.+</span>")SpLatinName <- unlist(SpLatinName)level="Genus"if(length(SpLatinName)==0){SpLatinName <- str_extract_all(string = web, pattern = "<span class='SpLatinName' level='Family'>.+</span>")SpLatinName <- unlist(SpLatinName)level="Family"if(length(SpLatinName)==0){SpLatinName <- str_extract_all(string = web, pattern = "<span class='SpLatinName' level='Subser.'>.+</span>")SpLatinName <- unlist(SpLatinName)level="Subser"if(length(SpLatinName)==0){SpLatinName <- str_extract_all(string = web, pattern = "<span class='SpLatinName' level='Kingdom'>.+</span>")SpLatinName <- unlist(SpLatinName)level="Kingdom"if(length(SpLatinName)==0){SpLatinName <- str_extract_all(string = web, pattern = "<span class='SpLatinName' level='Phylum'>.+</span>")SpLatinName <- unlist(SpLatinName)level="Phylum"if(length(SpLatinName)==0){SpLatinName <- str_extract_all(string = web, pattern = "<span class='SpLatinName' level='Class'>.+</span>")SpLatinName <- unlist(SpLatinName)level="Class"if(length(SpLatinName)==0){SpLatinName <- str_extract_all(string = web, pattern = "<span class='SpLatinName' level='Subclass'>.+</span>")SpLatinName <- unlist(SpLatinName)level="Subclass"if(length(SpLatinName)==0){SpLatinName <- str_extract_all(string = web, pattern = "<span class='SpLatinName' level='Order'>.+</span>")SpLatinName <- unlist(SpLatinName)level="Order"if(length(SpLatinName)==0){SpLatinName <- str_extract_all(string = web, pattern = "<span class='SpLatinName' level='Subfamily'>.+</span>")SpLatinName <- unlist(SpLatinName)level="Subfamily"if(length(SpLatinName)==0){SpLatinName <- str_extract_all(string = web, pattern = "<span class='SpLatinName' level='Tribe'>.+</span>")SpLatinName <- unlist(SpLatinName)level="Tribe"if(length(SpLatinName)==0){SpLatinName <- str_extract_all(string = web, pattern = "<span class='SpLatinName' level='Subgenus'>.+</span>")SpLatinName <- unlist(SpLatinName)level="Subgenus"if(length(SpLatinName)==0){SpLatinName <- str_extract_all(string = web, pattern = "<span class='SpLatinName' level='Section'>.+</span>")SpLatinName <- unlist(SpLatinName)level="Section"if(length(SpLatinName)==0){SpLatinName <- str_extract_all(string = web, pattern = "<span class='SpLatinName' level='Series'>.+</span>")SpLatinName <- unlist(SpLatinName)level="Series"if(length(SpLatinName)==0){SpLatinName <- str_extract_all(string = web, pattern = "<span class='SpLatinName' level='Domain'>.+</span>")SpLatinName <- unlist(SpLatinName)level="Domain"if(length(SpLatinName)==0){SpLatinName <- str_extract_all(string = web, pattern = "<span class='SpLatinName' level='Subphylum'>.+</span>")SpLatinName <- unlist(SpLatinName)level="Subphylum"if(length(SpLatinName)==0){SpLatinName="无"level="Others"}else{}}else{}}else{}}else{}}else{}}else{}}else{}}else{}}else{}}else{}}else{}}else{}}else{}}else{}}else{}}else{}
Latin.names <- str_extract(string = SpLatinName, pattern = ">[^&].+<") %>% str_replace_all(string = ., pattern = ">|<",replacement = "")#获取拉丁名Author <- web1%>%html_nodes(".SpLatinNameSAuthor")%>%html_text()#拉丁人名CNname <- web1%>%html_nodes(".SpCName")%>%html_text()#中文名
p <- str_extract_all(string = web, pattern = "<td>.+</td>")#获取td下的数据列表p <- unlist(p)#展示出列表LatinYM="无"#先假设拉丁异名无BM="无"#先假设别名无ZM="无"#先假设正名无，然后开始循环查找for(j in 1:length(p)){if(stringr::str_detect(p[j],"异名")){YM <- web1%>%html_nodes(".plantname")%>%html_text()#如果数据列表中包含“异名”两个字，则获取YMif(length(YM)==0){LatinYM="无"}else{x=1LatinYM<-YM[1]while(x < length(YM)){LatinYM <- paste(LatinYM,"/",YM[x+1],sep="")#异名多个的时候可以将其合并放在一行x=x+1}}}else if(stringr::str_detect(p[j],"别名")){#如果包含别名则获取别名BM <- str_extract_all(string = web, pattern = "<span style='margin-left:5px; margin-right:5px;'>.+</span>")BM<- unlist(BM)BM <- str_extract(string = BM, pattern = ">[^&].+<") %>% str_replace_all(string = ., pattern = ">|<|span| style='margin-left:5px; margin-right:5px;'",replacement = "")}else if(stringr::str_detect(p[j],"正名")){ZM <- str_extract_all(string = web, pattern = "<span class='plantname'>.+</span>")#获取正名ZM <- unlist(ZM)if(length(ZM)==0){ZM="无"#如果正名长度为0，那么它则不存在正名}else{ZM <- str_extract(string = ZM, pattern = ">[^&].+<") %>%  str_replace_all(string = ., pattern = ">|<",replacement = "")}}else{}}
CFH <- data.frame(d[i],CNname,level,Latin.names,Author,LatinYM,BM,ZM,site)#封装数据data <- rbind(data,CFH)print(paste("已完成第",i,"个","：",CNname,"，","剩余",length(d)-i,"个待处理"))#打印进展信息}}else{}}write.csv(data,file="./CFH.csv")#导出数据