To convert a Base64 string to a MultipartFile in Java, you can use the following steps:
- Decode the Base64 string to a byte array.
- Create a new MultipartFile instance using the decoded byte array.
Here’s an example of how you can achieve this:
import org.springframework.web.multipart.MultipartFile;
import org.springframework.util.Base64Utils;
public class Base64ToMultipartFileConverter {
public static MultipartFile convert(String base64String) {
// Decode the Base64 string to a byte array
byte[] decodedBytes = Base64Utils.decodeFromString(base64String);
// Create a new MultipartFile instance using the decoded byte array
MultipartFile multipartFile = new Base64MultipartFile(decodedBytes);
return multipartFile;
}
}
public class Base64MultipartFile implements MultipartFile {
private final byte[] bytes;
public Base64MultipartFile(byte[] bytes) {
this.bytes = bytes;
}
@Override
public String getName() {
return null;
}
@Override
public String getOriginalFilename() {
return null;
}
@Override
public String getContentType() {
return null;
}
@Override
public boolean isEmpty() {
return false;
}
@Override
public long getSize() {
return bytes.length;
}
@Override
public byte[] getBytes() {
return bytes;
}
@Override
public InputStream getInputStream() {
return new ByteArrayInputStream(bytes);
}
@Override
public void transferTo(File file) throws IOException, IllegalStateException { }
}
In this example, we first decode the Base64 string using the `Base64Utils.decodeFromString()` method from Spring’s `Base64Utils` class. Then, we create a custom implementation of `MultipartFile` named `Base64MultipartFile` that wraps the decoded byte array.
Finally, in the `convert()` method, we create a new instance of `Base64MultipartFile` using the decoded byte array and return it as the result.
Please note that this example uses Spring’s `Base64Utils` class for simplicity. If you’re not using Spring, you can use any other library or implement your own Base64 decoding logic.
I hope this helps!