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 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
Original: https://www.cnblogs.com/cott/p/16427464.html
Author: Cott
Title: 记一次base64转MultipartFile的坑
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