url下载图片到本地 FileUtils

import org.apache.commons.io.FileUtils;

import java.io.File;
import java.io.IOException;
import java.net.URL;

public class W {
    public static void main(String[] args) throws IOException {
        URL httpurl = new URL("https://ltschem.com/attachments/sds/Ag.pdf");
        File f = new File("D:\nana_file\Ag.pdf");
        FileUtils.copyURLToFile(httpurl, f);
    }
}

    commons-io
    commons-io
    2.4