java文件网络路径转MultipartFile

import org.apache.commons.compress.utils.IOUtils;
import org.springframework.util.ObjectUtils;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.mock.web.MockMultipartFile;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

/**
 * @description: 文件操作工具类
 * @author: LiYu
 * @create: 2021-09-04 17:38
 **/
public class FileUtil {
    /**
     * 根据地址获得数据的输入流
     *
     * @param strUrl 网络连接地址
     * @return url的输入流
     */
    public static InputStream getInputStreamByUrl(String strUrl) {
        HttpURLConnection conn = null;
        try {
            URL url = new URL(strUrl);
            conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("GET");
            conn.setConnectTimeout(20 * 1000);
            final ByteArrayOutputStream output = new ByteArrayOutputStream();
            IOUtils.copy(conn.getInputStream(), output);
            return new ByteArrayInputStream(output.toByteArray());
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (conn != null) {
                    conn.disconnect();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return null;
    }

    public static MultipartFile onlineAddressTransferFile(String strUrl) throws IOException {
        InputStream stream = FileUtil.getInputStreamByUrl(strUrl);
        if (!ObjectUtils.isEmpty(stream)) {
            MultipartFile file = new MockMultipartFile("网络图片", "网络图片","", stream);
            return file;
        }
        return null;
    }

}