Convert base64 to multipartfile java

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To convert a Base64 string to a MultipartFile in Java, you can use the following steps:

  1. Decode the Base64 string to a byte array.
  2. 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!

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