springboot踩坑日记——Feign传递MultipartFile

本文介绍了如何在Spring Boot应用中使用Feign Client实现Multipart上传,通过FeignMultipartSupportConfig创建配置,并展示了FileAdaptor接口的API调用示例。
创建配置类
package com.thecarevoice.frontend.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.context.annotation.Scope;

import feign.codec.Encoder;
import feign.form.spring.SpringFormEncoder
为解决 Feign 传递 `MultipartFile` 文件被加载到内存的问题,可采用以下方法: #### 使用 `InputStream` 处理文件流 不直接使用 `MultipartFile`,而是处理文件流,避免将整个文件加载到内存中。以下是示例代码: Feign Client 接口: ```java import org.springframework.cloud.openfeign.FeignClient; import org.springframework.http.MediaType; import org.springframework.http.RequestEntity; import org.springframework.web.bind.annotation.PostMapping; import org.springframework.web.bind.annotation.RequestBody; import java.io.InputStream; @FeignClient(name = "fileUploadClient", url = "your-server-url", configuration = FeignMultipartConfig.class) public interface FileUploadClient { @PostMapping(value = "/upload", consumes = MediaType.MULTIPART_FORM_DATA_VALUE) String uploadFile(@RequestBody RequestEntity<InputStream> requestEntity); } ``` 调用示例: ```java import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; import java.nio.file.Path; import org.springframework.http.MediaType; import org.springframework.http.RequestEntity; public class FileUploadService { private final FileUploadClient fileUploadClient; public FileUploadService(FileUploadClient fileUploadClient) { this.fileUploadClient = fileUploadClient; } public String uploadLargeFile(Path filePath) throws IOException { InputStream inputStream = new FileInputStream(filePath.toFile()); RequestEntity.BodyBuilder requestBuilder = RequestEntity.post("/upload") .contentLength(filePath.toFile().length()) .contentType(MediaType.APPLICATION_OCTET_STREAM); RequestEntity<InputStream> requestEntity = requestBuilder.body(inputStream); try { return fileUploadClient.uploadFile(requestEntity); } finally { inputStream.close(); } } } ``` #### 配置 Feign 支持流式传输 要确保 Feign 支持流式传输,需要添加相应的配置,如以下配置类: ```java import feign.codec.Encoder; import feign.form.spring.SpringFormEncoder; import org.springframework.beans.factory.ObjectFactory; import org.springframework.boot.autoconfigure.http.HttpMessageConverters; import org.springframework.cloud.openfeign.support.SpringEncoder; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; @Configuration public class FeignMultipartConfig { @Bean public Encoder feignFormEncoder(ObjectFactory<HttpMessageConverters> converters) { return new SpringFormEncoder(new SpringEncoder(converters)); } } ```
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