Java练习题:二(流)

package com.cy.se.io;

import java.io.FileInputStream;

public class FileInputStreamTest01 {
    
    public static void main(String[] args) {
        FileInputStream fileInputStream = null;
        try {
            //准备文件
            String file = "D:\JavaHome\ProjectCode\StudyCode\01-spring-se\test.txt";
            //创建文件字节输入流
            fileInputStream = new FileInputStream(file);
            //每次读4个
            byte[] b = new byte[4];
            //开始读取硬盘文件
            int read = fileInputStream.read(b);//4
            System.out.println(read);//返回的int 表示读取的字节数.
            //把读取的数组转换成字符串
            System.out.println(new String(b));//abcd
            //在读取数组
            fileInputStream.read(b);
            //数组转换成字符串,读取范围是0,到最后.
            System.out.println(new String(b,0,b.length-1));//efg
        }catch (Exception e){
            //打印异常信息
            e.printStackTrace();
        }
        //关流
        try {
            fileInputStream.close();
        }catch (Exception e){
            e.printStackTrace();
        }
    }
}