我要评论一、配置文件解析器
服务提供者和消费者都需要配置文件解析器，这里使用 commons-fileupload 替换原有的解析器：
依赖：
<dependency> <groupid>commons-fileupload</groupid> <artifactid>commons-fileupload</artifactid> <version>1.3.1</version> </dependency>
注入 bean ：
@bean(name = "multipartresolver")
public multipartresolver mutipartresolver(){
commonsmultipartresolver com = new commonsmultipartresolver();
com.setdefaultencoding("utf-8");
return com;
}
程序入口中剔除原有的解析器：
@springbootapplication(exclude = {multipartautoconfiguration.class})
二、服务提供者，即接收文件一方的配置
controller 的写法：
@responsebody
@requestmapping(value = "/upload", method = {requestmethod.post},
produces = {mediatype.application_json_utf8_value},
consumes = mediatype.multipart_form_data_value)
public result<string> uploadfile(@requestpart("file")multipartfile file,
@requestparam("id")long id){
string filename = file.getoriginalfilename();
string extend = fileoperateutil.suffix(filename);
fileoperateutil.copy("e:\\" + filename, file);
return resultbuilder.success("ok");
}
@requestpart 指定文件，后面的 @requestparam 是额外参数，注意额外参数不能超过url长度限制。
三、服务消费者配置
依赖：
<dependency> <groupid>io.github.openfeign.form</groupid> <artifactid>feign-form-spring</artifactid> <version>3.2.2</version> </dependency> <dependency> <groupid>io.github.openfeign.form</groupid> <artifactid>feign-form</artifactid> <version>3.2.2</version> </dependency>
文件编码配置：
import feign.codec.encoder;
import feign.form.spring.springformencoder;
import org.springframework.beans.factory.objectfactory;
import org.springframework.beans.factory.annotation.autowired;
import org.springframework.boot.autoconfigure.web.httpmessageconverters;
import org.springframework.cloud.netflix.feign.support.springencoder;
import org.springframework.context.annotation.bean;
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));
}
}
feign 接口定义：
@feignclient(name = "test-upload")
public interface uploadservice{
@responsebody
@requestmapping(value = "/upload", method = {requestmethod.post},
produces = {mediatype.application_json_utf8_value},
consumes = mediatype.multipart_form_data_value)
result<string>uploadfile(@requestpart("file")multipartfile file,
@requestparam("id")long id);
}
与普通 feign 接口写法差不多，注意方法注解和参数与服务提供者的 controller 一样。
controller 的写法， controller 中接收前端传过来的文件信息和额外参数，然后通过 feign 接口传输到远端：
// 注入 feign 接口
@autowired
private uploadservice uploadservice;
@requestmapping(value = "/upload", method = requestmethod.post, produces = "application/json; charset=utf-8")
@responsebody
public result<string> testupload(httpservletrequest request, long id){
result<string> result = null;
multiparthttpservletrequest mrequest = (multiparthttpservletrequest) request;
map<string, multipartfile> filemap = mrequest.getfilemap();
for (multipartfile mfile : filemap.values()) {
string filename = mfile.getoriginalfilename();
result = uploadservice.uploadfile(mfile, id);
}
return result;
}
四、总结
最后梳理一下流程，服务消费者接收前端（如浏览器）传过来的文件，但是并不进行业务处理，然后通过 feign 调用接口，把文件传给服务提供者，服务提供者拿到文件后，进行相应的业务处理。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持移动技术网。
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