记一次base64转MultipartFile的坑

@FeignClient(value = "base-files", cOnfiguration= SpringMultipartEncoder.class)
public interface UploadsClient {
    @PostMapping(value = "base/file/uploads",produces = {MediaType.APPLICATION_JSON_UTF8_VALUE},cOnsumes= MediaType.MULTIPART_FORM_DATA_VALUE)
    Map uploads(@RequestPart(value = "files") MultipartFile[] files);
}

import org.springframework.web.multipart.MultipartFile;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.Base64;

/**
 * @author Administrator
 */
public class Base64ToMultipartFile implements MultipartFile {
    private final byte[] fileContent;

    private final String extension;
    private final String contentType;


    /**
     * @param base64
     * @param dataUri 格式类似于: data:image/png;base64
     */
    public Base64ToMultipartFile(String base64, String dataUri) {
        this.fileCOntent= Base64.getDecoder().decode(base64.getBytes(StandardCharsets.UTF_8));
        this.extension = dataUri.split(";")[0].split("/")[1];
        this.cOntentType= dataUri.split(";")[0].split(":")[1];
    }

    public Base64ToMultipartFile(String base64, String extension, String contentType) {
        this.fileCOntent= Base64.getDecoder().decode(base64.getBytes(StandardCharsets.UTF_8));
        this.extension = extension;
        this.cOntentType= contentType;
    }

    @Override
    public String getName() {
        return "files";
    }

    @Override
    public String getOriginalFilename() {
        return "file_" + System.currentTimeMillis() + "." + extension;
    }

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

    @Override
    public boolean isEmpty() {
        return fileCOntent== null || fileContent.length == 0;
    }

    @Override
    public long getSize() {
        return fileContent.length;
    }

    @Override
    public byte[] getBytes() throws IOException {
        return fileContent;
    }

    @Override
    public ByteArrayInputStream getInputStream() throws IOException {
        return new ByteArrayInputStream(fileContent);
    }

    @Override
    public void transferTo(File file) throws IOException, IllegalStateException {
        try (FileOutputStream fos = new FileOutputStream(file)) {
            fos.write(fileContent);
        }
    }

}