如何将 FileReader 更改为 url

Question

I want to read xlsx files using js.
This is the code I have:

$(document).ready(function() {

$('#input-excel').change(function(e) {
  var reader = new FileReader();
  reader.readAsArrayBuffer(e.target.files[0]);

  reader.onload = function(e) {
    console.log(reader.result);
    var data = new Uint8Array(reader.result);
    console.log(data);
    var wb = XLSX.read(data,{type:'array'});
    console.log(wb);
  }
});
});

It gives me the xlsx in an array object, exactly what I need.

But I don't want the user to load the file,
I want the file to be loaded from a URL.

Does someone know how to do it?
Thank You

Answer 1

Let's say you have the same XLS file, you can use ajax to load it. Almost similar:

  $.ajax({
    url: URL_TO_FILE
  }).done(function(data) {
    console.log(data);
    var wb = XLSX.read(data,{type:'array'});
    console.log(wb);
  });

Answer 2

import org.json.simple.parser.ParseException;
import org.json.simple.parser.JSONParser;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;


JSONParser parser = new JSONParser();
ObjectMapper mapper = new ObjectMapper();

try {
    
    Object obj = parser.parse(new FileReader("/home/sahan/Desktop/data.json"));
    ObjectNode objNode = mapper.convertValue(obj, ObjectNode.class);
    System.out.println(objNode);

} catch (FileNotFoundException e) {
    e.printStackTrace();
} catch (ParseException e) {
    e.printStackTrace();
} catch (IOException e) {
    e.printStackTrace();
}