import java.io.BufferedOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

public class DownLoad {
    public static void main(String[]args){
        try {
            URL url 
 
= new URL("https://ss0.bdstatic.com/5aV1bjqh_Q23odCf/static/superman/img/logo/bd_logo1_31bdc765.png");
            try {
            URLConnection bd= url.openConnection();
            InputStream in = bd.getInputStream();
            
            BufferedOutputStream bo = new BufferedOutputStream(new FileOutputStream("D:/baiduCopy.png"));
            
 
byte[]b= new byte[1024];
            int n=-1;
            while((n=in.read(b))!=-1){
                bo.write(b, 0, n);
            }
            in.close();
            bo.close();
            
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        } 
 
catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    
        
    }
}

從網頁下載圖片的代碼