求助高手：如下红色字体，如何将textInput输入的路径-->filename<-dir(input$path)使用？
library(ggplot2)
library(shinydashboard)
library(shiny)
library(dplyr)
library(stringr)
library(DT)
library(readr)

dashboardPage(skin="yellow",
  dashboardHeader(title="SPC Control Item" ),
  dashboardSidebar(  
    sidebarMenu(
      menuItem("Data Import",tabName = "upload",icon=icon("table"),
        menuItem("File Path",tabName="Filepath",icon=icon("chain"))),
      menuItem("Data Display",tabName="Data",icon=icon("table")),
      menuItem("Chart",tabName="chart",icon=icon("line-chart"))
      )
    ),

  dashboardBody(
    tabItems(
      tabItem(tabName = "Filepath",
        fluidRow(
        box(title="",width=12,solidHeader=TRUE,status="warning",textInput("path","Please input file path"),
            verbatimTextOutput("textest"),DT::dataTableOutput("spc_file")),
        column(width=12,
               actionButton("get","Get",icon=icon("car"))))
    )
    )
  )
)


function(input,output,session){
  spcfile<-eventReactive(input$get,{
    filename<-dir(input$path)
    filepath<-paste(input$path,filename,sep="/")
    spc<-read.csv(filepath[1],header=FALSE,blank.lines.skip=FALSE,fill=TRUE,skip=1,col.names = (1:26),stringsAsFactors=FALSE)

    for(i in 2:length(filepath)){
      spc01<-read.csv(filepath,header=FALSE,blank.lines.skip = FALSE,fill=TRUE,skip=1,col.names = (1:26),stringsAsFactors=FALSE)
      spc<-rbind(spc,spc01)
       }
    names(spc)<-c("CUSTOMER_LOT_ID","LOT","PRODUCT","FAB","STATION","CONTROLITEM_ID","MEASURE_TIME","OPERATOR","SPECGROUP_ID",
                    "USL","SL","LSL","CONTROLGROUP_ID","X1","X2","X3","X4","X5","X6","X7","X8","X9","X10","X11","X12","X13")
    spc%>%filter(is.na(X1)==FALSE)->spc
    spc<-spc[,-26]
    #更换类型：
    #as.numeric(spc$LSL)->spc$LSL
   # as.numeric(spc$USL)->spc$USL
   # as.numeric(spc$SL)->spc$SL
    # 样本数更换：
    spc$X3[str_count(spc$X3,'[0-9]')==1]<-NA
    spc$X6[str_count(spc$X6,'[0-9]')==1]<-NA
    spc$X10[str_count(spc$X10,'[0-9]')==1]<-NA
    # 将SL & USL & LSL赋值给NA：
    for (t in 1:nrow(spc)){
      for(i in 14:ncol(spc)){
        if(is.na(spc[t,]$SL)==TRUE & is.na(spc[t,i])==TRUE){
          spc[t,i]<-spc[t,]$USL-0.1}
        else if(is.na(spc[t,]$SL)==FALSE & is.na(spc[t,i])==TRUE){
          spc[t,i]<-spc[t,]$SL
        }
      }
    }
    # end
  })

  output$textest<-renderText({input$path})

    output$spc_file<-DT::renderDataTable({
      DT::datatable(spcfile(),rownames = F)
    })




}