Java读取大文件csv

读取大文件的CSV可以使用Java的BufferedReader和Scanner类。以下是使用BufferedReader读取大文件的CSV的示例代码：

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class ReadCSV {
  public static void main(String[] args) {

    String csvFile = "path/to/your/file.csv";
    String line = "";
    String cvsSplitBy = ",";

    try (BufferedReader br = new BufferedReader(new FileReader(csvFile))) {

        while ((line = br.readLine()) != null) {

            // use comma as separator
            String[] data = line.split(cvsSplitBy);

            // do something with the data
            System.out.println("Data: " + data[0] + " " + data[1]);

        }

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

  }
}

另一种方法是使用Scanner类，以下是示例代码：

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;

public class ReadCSV {
  public static void main(String[] args) throws FileNotFoundException {

    String csvFile = "path/to/your/file.csv";
    Scanner scanner = new Scanner(new File(csvFile));
    scanner.useDelimiter(",");

    while (scanner.hasNext()) {
      String data = scanner.next();
      System.out.println("Data: " + data);
    }

    scanner.close();

  }
}

这些示例代码可以读取大型CSV文件而不会导致内存不足异常。