记一次base64转MultipartFile的坑

现在有个需求是接收base64编码的图片，然后上传到文件服务器上，由于文件服务的代码是固定的代码不能修改，所以只能适配接口。文件服务代码如下：

@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<String, Object> uploads(@RequestPart(value = \"files\") MultipartFile[] files);
}

所以需要把base64转成对应的MultipartFile，于是在网上找到了转换的代码

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);
        }
    }

}

调试了以后接口可以调通但是文件服务却接收不到文件，经过长时间的排查发现重写的Base64ToMultipartFile类的getName()方法必须返回和接收参数同名的值，即files，否则feign的接收方无法收到对应的参数。

Base64ToMultipartFile

来源：https://www.cnblogs.com/cott/p/16427464.html
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