字节输出流和输入流copy图片

Posted 2020-08-22

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


public class demo7 {

    /**
     * @param args
     * @throws IOException 
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
      PopyImage();
    }
    
    public static void PopyImage() {
        long time1 = System.currentTimeMillis();
        
        //找路径
        File file = new File("C:\\Users\\zhangheng\\Desktop\\d9cf11161c4ed2ad.jpg");
        //输入流 通道
        FileInputStream fileInputStream = null;
        try {
            fileInputStream = new FileInputStream(file);
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
//        缓冲区
        byte[] by =new byte[1024];
//        读取数据
        int count =0;
        //图片的路径
        File file1 = new File("C:\\Users\\zhangheng\\Desktop\\dd.jpg");
        //输出流通道
        FileOutputStream fileOutputStream = null;
        try {
            fileOutputStream = new FileOutputStream(file1);
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } 
        //读取数据
        try {
            while((count = fileInputStream.read(by)) !=-1){
                
//            System.out.println(new String(by,0,count));
                //写数据
                fileOutputStream.write(by);
                
                
            }
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        //后进的先关
        try {
            fileOutputStream.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
//        先进的后关
        try {
            fileInputStream.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
        long time2 =System.currentTimeMillis();
        System.out.println((time2-time1));
    }

}