1 Overview
When we are processing the function of file upload, we usually use the MultipartFile object to represent the uploaded file data. However, sometimes we may already have a File object instead of a MultipartFile object, which needs to be converted to a MultipartFile object for further processing.
In Java, the File object represents a reference to a file in the local file system, while the MultipartFile object is an interface provided by the Spring framework for handling file uploads. The MultipartFile interface provides many useful methods, such as getting file name, getting file content, getting file size, etc.
2 Code Examples
2.1 Introducing dependencies
<!--FilechangeMultipartFileneedtestBag--> <dependency> <groupId></groupId> <artifactId>spring-test</artifactId> <version>5.1.</version> <scope>compile</scope> </dependency>
2.2 MultipartFile to File
public static File convert(MultipartFile file) throws IOException {
File convFile = new File(());
();
FileOutputStream fos = new FileOutputStream(convFile);
(());
();
return convFile;
}2.3 File to MultipartFile
//Convert to MultipartFile private MultipartFile getMulFileByPath(String filePath)
{
FileItemFactory factory = new DiskFileItemFactory(16, null);
String textFieldName = "textField";
int num = (".");
String extFile = (num);
FileItem item = (textFieldName, "text/plain", true,
"MyFileName" + extFile);
File newfile = new File(filePath);
int bytesRead = 0;
byte[] buffer = new byte[8192];
try
{
FileInputStream fis = new FileInputStream(newfile);
OutputStream os = ();
while ((bytesRead = (buffer, 0, 8192))
!= -1)
{
(buffer, 0, bytesRead);
}
();
();
}
catch (IOException e)
{
();
}
MultipartFile mfile = new CommonsMultipartFile(item);
return mfile;
}Summarize
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