How to use io stream to copy pictures in java

java.io provides many stream classes. Here we are going to use FileInputStream/FileOutputStream----for reading raw bytes

（ Recommended tutorial: java introductory tutorial)

First we copy a picture into the current directory, for example: "d:/java/TestPicture/image1.jpg", and then we use FileInputStream Read the picture, and finally FileOutputStream generates a picture as image2.jpg in the current directory.

(Video tutorial recommendation: java video tutorial)

java code:

import java.io.*;
public class TestPictureCopy{
    public static void main(String []args)throws Exception{
    //会抛异常，所以我们在主函数中给抛出去
   //输入流
     FileInputStream fis=new FileInputStream("image1.jpg");
     //输出流
     FileOutputStream fos=new FileOutputStream("image2.jpg");
     
        //我们用read(byte[]b,int off,int len)函数来读-确保两张图片大小一致，且效率还高
     byte[] b=new byte[1024];
       int num=0;
       while((num=fis.read(b,10,1000))!=-1){
            fos.write(b,10,num);
       }
       fis.close();
       fos.close();
   }
}

See if image1.jpg has been generated in the current directory Replicaimage2.jpg.

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