您可以使用pdf library来完成此任务

import 'dart:io'; 
import 'package:pdf/pdf.dart' as pw;

像这样导入，然后使用以下方法从pdf中提取文本

String loadPdf({required String pdfPath}) {
  String text = "";
  // Load the PDF file
  var file = File(pdfPath);
  var bytes = file.readAsBytesSync();

  // Decode the PDF file
  var pdf = pw.PdfDocument.fromBytes(bytes);

  // Extract the text from the PDF

  for (var page in pdf.pages) {
    var pageText = page.getText();
    text += pageText;
  }
  return text;
}