Multipartfile文件传输
1. 添加依赖
<dependency>
<groupId>io.github.openfeign.form</groupId>
<artifactId>feign-form</artifactId>
<version>3.3.0</version>
</dependency>
<dependency>
<groupId>io.github.openfeign.form</groupId>
<artifactId>feign-form-spring</artifactId>
<version>3.3.0</version>
</dependency>
2. 添加配置类
@Configuration
public class FeignMultipartConfig {
@Bean
@Primary
@Scope("prototype")
public SpringFormEncoder multipartFormEncoder() {
return new SpringFormEncoder();
}
@Bean
public feign.Logger.Level multipartLoggerLevel() {
return feign.Logger.Level.FULL;
}
}
3. 接口编写
@FeignClient使用配置类
@PostMapping设置
consumes = MediaType.MULTIPART_FORM_DATA_VALUE
使用@RequestPart(),不能使用@RequestParam()
@FeignClient(value = "face-service",configuration = FeignMultipartConfig.class)
public interface FaceClient {
@PostMapping(value = "/search/student", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
ResponseBase<SearchStudentFaceVO> searchStudentFace(@RequestPart("file") MultipartFile file);
}
feign不能正常传递参数MultipartFile(文件)的解决
之前工作中有个业务场景:需要把文件以MultipartFile进行服务之间的调用(使用的是Feign),特此记录下踩到的坑
需要注意的是:使用默认的springcloud自带的spring-cloud-starter-openfeign是不支持传递文件的。
我看网上有很多使用feign-form和feign-form-spring支持的jar包,然后配置SpringFormEncoder,但我试了,没有成功,最后使用了另外一种方法,在此记录下吧:
方法一:使用外部依赖
<dependency>
<groupId>io.github.openfeign.form</groupId>
<artifactId>feign-form</artifactId>
<version>3.3.0</version>
</dependency>
<dependency>
<groupId>io.github.openfeign.form</groupId>
<artifactId>feign-form-spring</artifactId>
<version>3.3.0</version>
</dependency>
新建配置类:
package com.jsyd.ict.ictservicemanager.configuration;
import org.springframework.beans.factory.ObjectFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.http.HttpMessageConverters;
import org.springframework.cloud.openfeign.support.SpringEncoder;
import org.springframework.context.annotation.Bean;
import feign.codec.Encoder;
import feign.form.spring.SpringFormEncoder;
import org.springframework.context.annotation.Configuration;
@Configuration
public class MultipartSupportConfig {
@Autowired
private ObjectFactory<HttpMessageConverters> messageConverters;
@Bean
public Encoder feignFormEncoder() {
return new SpringFormEncoder(new SpringEncoder(messageConverters));
}
}
配置feign接口:
package com.jsyd.ict.ictservicemanager.feign;
import com.jsyd.ict.ictservicemanager.util.resp.RespUtil;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.InputStream;
@FeignClient(name = "ict-service-capacity", configuration = MultipartSupportConfig.class)
public interface CapacityFeign {
@RequestMapping(value = "contentAudit/baiduImgAuditByFile", method = RequestMethod.POST, consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
RespUtil baiduImgAuditByFile(@RequestPart(value = "file") MultipartFile file);
}
注意:文件的传输需要使用@RequestPart()注解
服务端:
@RequestMapping(value = "/baiduImgAuditByFile", method = RequestMethod.POST)
public RespUtil baiduImgAuditByFile(@RequestParam("file") MultipartFile file) {
// 调用service
return null;
}
结果发现,这样是获取不到结果的,研究了好一会,因为要着急联调,就没有继续跟踪了,有时间在深入研究下。
后来使用了下面的方法,成功传参
方法二:使用HttpServletRequest获取
上述操作都不需要,即:不需要导入依赖,也不需要创建文件,只需要在服务端通过HttpServletRequest去设置
使用HttpServletRequest设置:
伪代码如下:
@RequestMapping(value = "/baiduImgAuditByFile", method = RequestMethod.POST)
public RespUtil baiduImgAuditByFile(MultipartFile file, HttpServletRequest request) {
if (file == null) {
// 解决服务间调用无法接受MultipartFile参数的问题
String contentType = request.getContentType();
if (contentType != null && contentType.toLowerCase().startsWith("multipart/")) {
MultipartHttpServletRequest multipartRequest =
WebUtils.getNativeRequest(request, MultipartHttpServletRequest.class);
if (multipartRequest != null) {
MultiValueMap<String, MultipartFile> multiFileMap = multipartRequest.getMultiFileMap();
for (Map.Entry<String, List<MultipartFile>> entry : multiFileMap.entrySet()) {
file = entry.getValue().get(0);
}
}
}
}
// 处理业务逻辑
return null;
}
主要说明如下图:
即通过HttpServletRequest 的方式即使文件获取不到,也可以进行特殊处理,从而获取文件。
以上为个人经验,希望能给大家一个参考,也希望大家多多支持编程网。