最近写代码需要将输入流转成MultipartFile，我们都知道MultipartFile转输入流是很好转的，但输入流并不能直接转为MultipartFile，我就自己在网上找了一个相对简单的方法。
上代码
/**
* 获取封装得MultipartFile
*
* @param inputStream inputStream
* @param fileName fileName
* @return MultipartFile
*/
public static MultipartFile getMultipartFile(InputStream inputStream, String fileName) {
FileItem fileItem = createFileItem(inputStream, fileName);
//CommonsMultipartFile是feign对multipartFile的封装，但是要FileItem类对象
return new CommonsMultipartFile(fileItem);
}
/**
* FileItem类对象创建
*
* @param inputStream inputStream
* @param fileName fileName
* @return FileItem
*/
public static FileItem createFileItem(InputStream inputStream, String fileName) {
FileItemFactory factory = new DiskFileItemFactory(16, null);
String textFieldName = "file";
FileItem item = factory.createItem(textFieldName, MediaType.MULTIPART_FORM_DATA_VALUE, true, fileName);
int bytesRead = 0;
byte[] buffer = new byte[10 * 1024 * 1024];
OutputStream os = null;
//使用输出流输出输入流的字节
try {
os = item.getOutputStream();
while ((bytesRead = inputStream.read(buffer, 0, 8192)) != -1) {
os.write(buffer, 0, bytesRead);
}
inputStream.close();
} catch (IOException e) {
log.error("Stream copy exception", e);
throw new IllegalArgumentException("文件上传失败");
} finally {
if (os != null) {
try {
os.close();
} catch (IOException e) {
log.error("Stream close exception", e);
}
}
if (inputStream != null) {
try {
inputStream.close();
} catch (IOException e) {
log.error("Stream close exception", e);
}
}
}
return item;
}
