废话不多说，直接上代码 一、异常捕捉类
public class BusinessException extends RuntimeException {
public BusinessException(String msg){
super(msg);
}
}
二、转换类
package com.example.answer_system.utils;
import org.springframework.mock.web.MockMultipartFile;
import org.springframework.web.multipart.MultipartFile;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
//文件转换工具
public class FileUtils {
/**
* 将网络文件转换为文件流
* @param imageUrl
* @return
*/
public static MultipartFile fileUrlConvertToMultipartFile(String imageUrl) {
try {
// 将在线图片地址转换为URL对象
URL url = new URL(imageUrl);
// 打开URL连接
URLConnection connection = url.openConnection();
// 转换为HttpURLConnection对象
HttpURLConnection httpURLConnection = (HttpURLConnection) connection;
// 获取输入流
InputStream inputStream = httpURLConnection.getInputStream();
// 读取输入流中的数据，并保存到字节数组中
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int bytesRead;
while ((bytesRead = inputStream.read(buffer)) != -1) {
byteArrayOutputStream.write(buffer, 0, bytesRead);
}
// 将字节数组转换为字节数组
byte[] bytes = byteArrayOutputStream.toByteArray();
// 创建ByteArrayInputStream对象，将字节数组传递给它
ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(bytes);
// 创建MultipartFile对象，将ByteArrayInputStream对象作为构造函数的参数
MultipartFile multipartFile = new MockMultipartFile("file", "filename.jpg", "image/jpg", byteArrayInputStream);
return multipartFile;
}catch (IOException ex){
ex.printStackTrace();
throw new BusinessException("附件无效");
}
}
}
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