MultipartFile与File互转&inputStream转File

很多时候,在对文件上传和下载的时候,内置的MultipartFile文件类型有时候并不符合我们的操作要求,需要对MultipartFile文件类型进行转换。


/**
* MultipartFile 转 File
* @param file
* @throws Exception
*/
public static void multipartFileToFile( @RequestParam MultipartFile file ) throws Exception {
File toFile = null;
if(file.equals("")||file.getSize()<=0){
file = null;
}else {
InputStream ins = null;
ins = file.getInputStream();
toFile = new File(file.getOriginalFilename());
inputStreamToFile(ins, toFile);
ins.close();
}
}
/**
* File 转 MultipartFile
* @param file
* @throws Exception
*/
public static void fileToMultipartFile( File file ) throws Exception {
FileInputStream fileInput = new FileInputStream(file);
MultipartFile toMultipartFile = new MockMultipartFile("file",file.getName(),"text/plain", IOUtils.toByteArray(fileInput));
toMultipartFile.getInputStream();
}
/**
* InputStream 转 File
* @param ins
* @param file
*/
public static void inputStreamToFile(InputStream ins, File file) {
try {
OutputStream os = new FileOutputStream(file);
int bytesRead = 0;
byte[] buffer = new byte[8192];
while ((bytesRead = ins.read(buffer, 0, 8192)) != -1) {
os.write(buffer, 0, bytesRead);
}
os.close();
ins.close();
} catch (Exception e) {
e.printStackTrace();
}
}
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