🤧URL编程

存储在网络上的图片

package test22;
import javax.net.ssl.HttpsURLConnection;
import java.io.BufferedOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
/**
 * Created By Intellij IDEA
 *
 * @author Xinrui Yu
 * @date 2021/12/6 15:05 星期一
 */
public class UrlTest {
    public static void main(String[] args) {
        FileOutputStream fileOutputStream = null;
        BufferedOutputStream bufferedOutputStream = null;
        try {
            fileOutputStream = new FileOutputStream("URLIMG.png");
            bufferedOutputStream = new BufferedOutputStream(fileOutputStream);
            // 通过 URL 来请求存储在网络上的资源文件
            URL url = new URL("https://cdn.jsdelivr.net/gh/yxr2333/imgContainer/20211129151123.png");
            HttpsURLConnection urlConnection = (HttpsURLConnection) url.openConnection();
            urlConnection.connect();
            // 获得文件的输入流
            InputStream inputStream = urlConnection.getInputStream();
            int len;
            byte[] buffer = new byte[1024];
            // 通过文件的输入流，将文件下载到本地
            while((len = inputStream.read(buffer)) != -1){
                bufferedOutputStream.write(buffer,0,len);
            }
            System.out.println("图片资源下载完毕!");
            // 关闭必要的资源连接
            inputStream.close();
            urlConnection.disconnect();
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            if(bufferedOutputStream != null){
                try {
                    bufferedOutputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

运行程序，图片可以成功的从网络上下载下来。