使用inputStream读取文件

public class DemoT {

    public static void main(String[] args) throws Exception {
        ClassPathResource resource = new ClassPathResource("20200916_order_detail.csv");
        String path =  resource.getPath();
        InputStream in = resource.getInputStream();
        byte[] b = new byte[2048];

        int c = 0;

        String str = "";

        while((c = in.read(b)) != -1){
            str += new String(b,0,c);//在此拼接
        }

        String[] s = str.split("
");//以
来截取！转化为数组！
        System.out.println(s.length);
        System.out.println(s[1]);
        System.out.println(s[2]);
    }
}

如果是文件是其他路径下的