java 图片地址转MultipartFile对象

以下是Java将图片地址转换为MultipartFile对象的代码示例：

import org.springframework.mock.web.MockMultipartFile;
import org.springframework.web.multipart.MultipartFile;

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;

public class ImageUtil {

    /**
     * 将网络图片地址转换为MultipartFile对象
     *
     * @param imgUrl 图片地址
     * @return MultipartFile对象
     */
    public static MultipartFile getMultipartFile(String imgUrl) throws IOException {
        URL url = new URL(imgUrl);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setRequestMethod("GET");
        conn.setConnectTimeout(5 * 1000);
        InputStream inputStream = conn.getInputStream();
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int len;
        while ((len = inputStream.read(buffer)) != -1) {
            outputStream.write(buffer, 0, len);
        }
        inputStream.close();
        byte[] bytes = outputStream.toByteArray();
        outputStream.close();
        // 将字节数组转换为MultipartFile对象
        MultipartFile multipartFile = new MockMultipartFile("file", "img.jpg", "image/jpeg", bytes);
        return multipartFile;
    }
}

该代码使用了Spring框架中的MockMultipartFile类，将字节数组转换为MultipartFile对象。在方法中，我们首先通过图片地址获取图片的输入流，然后将输入流转换为字节数组，最后将字节数组转换为MultipartFile对象。