Java实现文件读取和写入过程解析

package com.io;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;/** * @auther:：9527 * @Description: 尝试 * @program: shi_yong * @create: 2019-07-31 17:11 */public class Tyy {  public static void main(String[] args) {    //实例化对象   Tyy tyy = new Tyy();   //用一个byte[]接受数据   byte[] bytes=tyy.read("d:/ak.txt");   //将接受到的数据传入写入方法   tyy.write("d:/hello.txt",bytes);  }  //读取方法，设定传参是文件的String路径，返回一个byte[]数组  public byte[] read(String str) {    byte[] bytes = new byte[0];    FileInputStream fis = null;    try {      fis = new FileInputStream(str);      int read;      bytes = new byte[1024000];      System.out.println("内容读取中...........");      while ((read = fis.read(bytes)) != -1) {        for (int i = 0; i < read; i++) {          System.out.print((char) bytes[i]);        }        System.out.println("/n内容读取完毕");      }      return bytes;    } catch (FileNotFoundException e) {      e.printStackTrace();    } catch (IOException e) {      e.printStackTrace();    } finally {      try {        fis.close();      } catch (IOException e) {        e.printStackTrace();      }    }    return bytes;  }  //写入方法，需要两个参数，一是写入路径，一是写入内容  public void write(String string,byte[] bytes) {    System.out.println("文件写入中-----");    FileOutputStream fos = null;    try {      fos = new FileOutputStream(string);      try {        fos.write(bytes);      } catch (IOException e) {        e.printStackTrace();      }      System.out.println("文件写入完毕");    } catch (FileNotFoundException e) {      e.printStackTrace();    }finally {      try {        fos.close();      } catch (IOException e) {        e.printStackTrace();      }    }  }}