将byte[]转换为MultipartFile

import org.springframework.web.multipart.MultipartFile;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

public class ByteToMultipartFile implements MultipartFile {
    private final byte[] content;
    private final String name;
    private final String originalFilename;
    private final String contentType;

    public ByteToMultipartFile(byte[] content, String name, String originalFilename, String contentType) {
        this.content = content;
        this.name = name;
        this.originalFilename = originalFilename;
        this.contentType = contentType;
    }

    @Override
    public String getName() {
        return name;
    }

    @Override
    public String getOriginalFilename() {
        return originalFilename;
    }

    @Override
    public String getContentType() {
        return contentType;
    }

    @Override
    public boolean isEmpty() {
        return content.length == 0;
    }

    @Override
    public long getSize() {
        return content.length;
    }

    @Override
    public byte[] getBytes() throws IOException {
        return content;
    }

    @Override
    public InputStream getInputStream() throws IOException {
        return new ByteArrayInputStream(content);
    }

    @Override
    public void transferTo(File dest) throws IOException, IllegalStateException {
        // 实现文件的保存操作，可根据具体需求自行实现
    }
}

byte[] fileBytes = // 从某处获取到的byte[]数据
String fileName = // 文件名
String contentType = // 文件类型

MultipartFile multipartFile = new ByteToMultipartFile(fileBytes, "file", fileName, contentType);