inputstream转multipartfile多个方法

1. 使用Apache Commons IO库

import org.apache.commons.io.IOUtils;

public MultipartFile convert(InputStream inputStream, String fileName, String contentType) throws IOException {
    byte[] bytes = IOUtils.toByteArray(inputStream);
    return new MockMultipartFile(fileName, fileName, contentType, bytes);
}

2. 使用Spring框架的MultipartFile

import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.commons.CommonsMultipartFile;

public MultipartFile convert(InputStream inputStream, String fileName, String contentType) throws IOException {
    return new CommonsMultipartFile(fileName, inputStream);
}

3. 使用Java原生的Part接口

import javax.servlet.http.Part;

public MultipartFile convert(InputStream inputStream, String fileName, String contentType) throws IOException, ServletException {
    Part part = new MockPart(fileName, contentType, inputStream);
    return new StandardMultipartFile(part);
}