Question

我需要发送一个具有多个值的json文件，并使用水管工在R中接收它，我尝试过此操作，但它似乎不起作用，

library("rjson")
#install.packages("rjson")
#* @get /predict
#* @post /predict
function(predict) {
  # Load the package required to read JSON files.
  library("rjson")
  # Give the input file name to the function.
  result <- fromJSON(file = "input_v3.json")
  print(result)
  result <- as.data.frame(result)
  write.table(result, file="testing_v3_xyz.csv", sep=",", row.names=FALSE, col.names=TRUE, append = T)
}


The curl command i used is curl -F data=@input_v3.json http://xx.xxx.xxx.xx:8000/predict

我需要向其发送一个IP地址，该地址是在AWS上运行的Desktop中的Rstudio。

Answer 1

plumber如果通过--data发送JSON，则透明地解压缩JSON：

library(plumber)

#* parse JSON
#* @param a  a vector
#* @param b  a vector
#* @get /predict
#* @post /predict
function(a, b) {
  result <- data.frame(a = as.numeric(a), b = as.numeric(b))
  write.table(result, file="testing_v3_xyz.csv", sep=",",
              row.names=FALSE, col.names=TRUE, append = T)
}

我在本地运行此API：

$ cat foo.json 
{ "a":["1","2","3","4","5","6","7","8" ], "b":["1","2","3","4","5","6","7","8" ] }
$ curl --data @foo.json  http://localhost:8414/predict
{}
$ cat ~/learning/stackoverflow/testing_v3_xyz.csv 
"a","b"
1,1
2,2
3,3
4,4
5,5
6,6
7,7
8,8

如果JSON的顶层是与对象相对的数组，则无法使用命名参数将数据获取到函数中。但是，您可以使用req$postBody来访问发布的内容：

library(plumber)

#* parse JSON
#* @param req  the request object
#* @get /predict
#* @post /predict
function(req) {
  result <- as.data.frame(lapply(jsonlite::fromJSON(req$postBody), unlist))
  write.table(result, file="testing_v3_xyz.csv", sep=",", row.names=FALSE, col.names=TRUE, append = T)
}

对我来说，这适用于以下示例数据：

[
  { "a":["1","2","3","4","5","6","7","8" ],
    "b":["1","2","3","4","5","6","7","8" ] },
  { "a":["1","2","3","4","5","6","7","8" ], 
    "b":["1","2","3","4","5","6","7","8" ] }
]

使用curl在curl中发送json文件并在R中接收它

1 个答案: