按列提取txt文件中的一列

import java.io.*;
import java.util.Arrays;

public class SelectByColumn {

    public static void main(String[] args) {
        SelectByColumn  sbc = new SelectByColumn();
        try {
            sbc.selectByColumn();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void selectByColumn() throws IOException {//图方便直接throws了
        //1.将file实例化
        File srcFile = new File(".\src\Data.txt");
        File destFile = new File(".\src\dest.txt");

        //2.造流
        FileReader fr = new FileReader(srcFile);
        BufferedReader br = new BufferedReader(fr);

        FileWriter fw = new FileWriter(destFile);
        BufferedWriter bw = new BufferedWriter(fw);

        //3.读与写
        String data;
        while ((data=br.readLine()) != null){
            bw.write(data.split("\s+")[1]+"n"); //只要index=1的数据
            
			//data.split("\s+")可以按空格将data分割成数组
            System.out.println(Arrays.toString(data.split("\s+")));  //看看分割后的结果

        }

        //4.关闭流
        bw.close();
        br.close();
    }
}