java读取大文件

package com.woxiangbo;

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStreamReader;

public class Demo {
	public static void main(String[] args) throws Exception {
		File file = new File("D:/Book1.csv");
		BufferedInputStream fis = new BufferedInputStream(new FileInputStream(
				file));
		BufferedReader reader = new BufferedReader(new InputStreamReader(fis,
				"utf-8"), 5 * 1024 * 1024);// 用5M的缓冲读取文本文件

		String line = "";
		int i = 0;
		long s=System.currentTimeMillis();
		while ((line = reader.readLine()) != null) {
			i++;
			System.out.println(i);
		}
		long e=System.currentTimeMillis();
		System.out.println((e-s)/1000);

	}
}