file 转 MultipartFile

• 文件转换 file 转 MultipartFile

代码：

/**
* @Description file 转 MultipartFile
* @author wjl
* @date 2019/8/23 0023
* @param [file]
* @return org.springframework.web.multipart.MultipartFile
*/
public static MultipartFile fileToMultiPartFile(File file){
LocalDateTime localDateTime=LocalDateTime.now();
String fileExt=localDateTime.getYear()+"-"+localDateTime.getMonth().getValue()+"-"+localDateTime.getDayOfMonth()+"-";
MultipartFile multipartFile=new MultipartFile() {
@Override
public String getName() {
return fileExt+file.getName();
}

@Override
public String getOriginalFilename() {
return fileExt+file.getName();
}

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

@Override
public boolean isEmpty() {

return file==null ? true :false;
}

@Override
public long getSize() {
return 0;
}

@Override
public byte[] getBytes() {
return File2byte(file);
}

@Override
public InputStream getInputStream() throws IOException {
return new FileInputStream(file);
}

@Override
public void transferTo(File file) throws IOException, IllegalStateException {

}
};

return multipartFile;
}

• 文件转字数组

/**
* 将文件转字节数组
* @param filePath
* @return
*/
public static byte[] File2byte(File tradeFile){
byte[] buffer = null;
try
{
FileInputStream fis = new FileInputStream(tradeFile);
ByteArrayOutputStream bos = new ByteArrayOutputStream();
byte[] b = new byte[1024];
int n;
while ((n = fis.read(b)) != -1)
{
bos.write(b, 0, n);
}
fis.close();
bos.close();
buffer = bos.toByteArray();
}catch (FileNotFoundException e){
e.printStackTrace();
}catch (IOException e){
e.printStackTrace();
}
return buffer;
}