12 URL 下载网络资源

Uniform Resource Locator：统一资源定位符; 统一资源定位器; 资源定位器; 资源定位; 源定位符;

package Internet;

import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

// 对比多线程时学的下载网图
public class Test12_URLlDownload {
    public static void main(String[] args) throws Exception {
        // 获得URL：统一资源定位器 下载地址
        URL url = new URL("https://pic.netbian.com/uploads/allimg/171009/194751-15075496719aaa.jpg");
        System.out.println(url.getProtocol());   // 协议
        System.out.println(url.getHost());       // 主机IP
        System.out.println(url.getPort());      // 端口，这里没有？
        System.out.println(url.getAuthority());   // 作者
        System.out.println(url.getFile());       // 文件全路径
        System.out.println(url.getPath());    // 文件
        // 连接这个资源
        HttpURLConnection httpURLConnection=(HttpURLConnection) url.openConnection();
        // 下载
        InputStream is = httpURLConnection.getInputStream();
        FileOutputStream fos = new FileOutputStream("the witcher 3.jpg");
        byte[] buffer = new byte[1];
        while (is.read(buffer)!=-1){
            fos.write(buffer,0,buffer.length);
        }


    }
}