通过Url下载网络资源

步骤

1. 通过下载地址创建url对象
2. 连接到这个资源的http
3. 从获取输入流
4. 读取并写入
5. 关闭连接

具体代码

package Url;

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

public class UrlDown {
    public static void main(String[] args) throws Exception {

        //1.通过下载地址创建url对象
        URL url = new URL("https://i1.hdslb.com/bfs/face/[email protected]_140h_1c.webp");
        //2.连接到这个资源的http
        HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
        //3.从获取输入流
        InputStream inputStream = urlConnection.getInputStream();
        //4.读取并写入
        byte[] buffer = new byte[1024];
        int len;
        FileOutputStream fileOutputStream = new FileOutputStream(new File("3.jpg"));
        while((len=inputStream.read(buffer)) != -1){
            fileOutputStream.write(buffer,0,len);
        }
        //5.关闭连接
        fileOutputStream.close();
        inputStream.close();
        urlConnection.connect();
    }
}