输入输出流与文件操作

1.读+写，拷贝

代码：

import java.io.*;
public class FileRW_Test{
    public static void main(String[] args) throws IOException {
        String A_Path = "..\\bin\\谷歌浏览器页面翻译恢复详细流程.txt";
        String B_Path = "D:\\Program Files\\Java\\jdk1.8.0_92\\bin\\拷贝.txt";

        FileInputStream A_file = new FileInputStream(A_Path);
        FileOutputStream B_file = new FileOutputStream(B_Path,true);

        byte[] buffer = new byte[1024];
        int length;
        
        while((length = A_file.read(buffer)) != -1){
            System.out.print(new String(buffer, 0, length));
        }
        A_file.getChannel().position(0);

        B_file.write("我将继续学习JAVA!\n".getBytes());

        while ((length = A_file.read(buffer)) != -1) {
            B_file.write(buffer, 0, length);
        }

        A_file.close();
        B_file.close();

        System.out.println("文件读写拷贝成功！");
    }
}

 运行结果：

2.将斐波那契数列写入文档。

代码：

import java.util.*;
import java.io.*;

public class Fbnq_file{
    public static void main(String[] args) throws IOException {
        String B_Path = "D:\\Program Files\\Java\\jdk1.8.0_92\\bin\\斐波那契数.txt";
        FileOutputStream B_file = new FileOutputStream(B_Path, true);
        int i = 1;
        int j = 1;
        int sum;
        Scanner input = new Scanner(System.in);
        System.out.println("请输入你想得到多少个斐波那契数");
        int n = input.nextInt();
        System.out.print(i + " " );
        System.out.print(j + " " );

        B_file.write("1 1 ".getBytes()); 

        for (int m = 3; m <= n; m++) {
            sum = i + j;
            System.out.print(sum + " " );

            B_file.write((Integer.toString(sum)+" ").getBytes()); 

            i = j;
            j = sum;
        }
        B_file.close();
    }
}

运行结果：