使用java读取txt里边的文件内容并获取大小（M）.txt

package com;

import java.io.File;

import java.io.*;

import java.io.FileInputStream;

import java.io.FileReader;

public class FileContent {

     private String path = "D:\\下载说明.txt";    

        public FileContent() throws IOException     

        {    

            File f = new File(path);    

            FileReader fileReader = new FileReader(f);    

            BufferedReader br = new BufferedReader(fileReader);    

            String str;    

            while((str = br.readLine() ) != null)    

            {    

                System.out.println(str);    

            }    

            System.out.println(new FileInputStream(new File(path)).available() / 1024 / 1024 +"M");  

        }

        public static void main(String[] args) {    

            try {    

                new FileContent();    

            } catch (IOException e) {    

                e.printStackTrace();    

            }    

        }   

}