Java使用URL下载资源

示例代码：

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

public class GetURLResource {
    public static void main(String[] args) throws Exception {
        // 1. 下载地址
        URL url = new URL("https://imgessl.kugou.com/stdmusic/20160907/20160907190359515842.jpg");

        // 2. 使用http协议链接地址
        HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();

        // 3. 获取输入流
        InputStream inputStream = urlConnection.getInputStream();

        // 4. 创建输出流及buffer
        FileOutputStream fileOutputStream = new FileOutputStream("test.jpg");
        byte[] buffer = new byte[1024];
        int len;
        while ((len = inputStream.read(buffer)) != -1) {
            fileOutputStream.write(buffer, 0, len);
        }

        // 5. 关闭流
        fileOutputStream.close();
        inputStream.close();
        urlConnection.disconnect();
    }
}

结果：