0306作业

package com.bd22;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class Copy {
 public static void main(String[] args) {
 try {
 FileOutputStream fos =new FileOutputStream("out.txt");
 String str ="abcd";
 byte[] bytes = str.getBytes();
 //fos.write(str.getBytes());
 try {
 fos.write(bytes,0,bytes.length);
 fos.flush();
 fos.close();
 } catch (IOException e) {
 e.printStackTrace();
 }
 } catch (FileNotFoundException e) {
 e.printStackTrace();
 }
 }
}

public class InputDemo {
    public static void main(String[] args) {
        try {
            FileInputStream fis=new FileInputStream("bdqn.txt");
            int result =-1;
            try {
                System.out.println("能够读取到的字节数："+fis.available());
                while((result= fis.read())!=-1){
                    System.out.println((char)result);
                }
                fis.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }
}

package com.bd22;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class CopyDemo {
    public static void main(String[] args) {
        FileInputStream fis = null;
        FileOutputStream fos = null;
        try {
            fis = new FileInputStream("bdqn.txt");
            try {
                System.out.println("能够读取到的字节数："+fis.available());
            } catch (IOException e) {
                e.printStackTrace();
            }
            int result = -1;
            String info = "";
            try {
                while((result=fis.read())!=-1){
                    info += (char)result;
                }
                System.out.println("读取完毕，准备拷贝。");
            } catch (IOException e) {
                e.printStackTrace();
            }
             fos = new FileOutputStream("out.txt");
            byte[] Copy = info.getBytes();
            try {
                fos.write(Copy,0,Copy.length);
                fos.flush();
            } catch (IOException e) {
                e.printStackTrace();
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }finally {
            if(fos!=null){
                try {
                    fos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if(fis!=null){
                try {
                    fis.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

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