SpringCloud Feign实现文件上传

Feign中不支持文件上传，需要引用外部依赖进行相应的配置才能实现。

1、Eureka注册中心

1.1、引入依赖

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<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.4.3.RELEASE</version>
</parent>

<properties>
    <spring.cloud.version>Camden.SR4</spring.cloud.version>
</properties>

<dependencies>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-eureka-server</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</artifactId>
    </dependency>

</dependencies>

<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>${spring.cloud.version}</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>

1.2、配置文件application.yml

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server:
  port: 9000

spring:
  application:
    name: springcloud-eureka

eureka:
  server:
    enable-self-preservation: false #禁用自我保护模式
  client:
    healthcheck:
      enable: true
    register-with-eureka: false
    fetch-registry: false
    serviceUrl:
      defaultZone: http://127.0.0.1:9000/eureka/

1.3、注册中心启动类

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import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@SpringBootApplication
@EnableEurekaServer
public class EurekaApplication {

    public static void main(String[] args) {
        SpringApplication.run(EurekaApplication.class, args);
    }
}

2、文件上传服务

2.1、文件上传类

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import org.springframework.util.FileCopyUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestPart;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.io.IOException;

@RestController
public class FileUploadController {

    @RequestMapping(value = "upload", method = RequestMethod.POST)
    public String fileUplaod(@RequestPart(value = "file") MultipartFile file) throws IOException {
        byte[] bytes = file.getBytes();
        File file2save = new File(file.getOriginalFilename());
        FileCopyUtils.copy(bytes, file2save);
        return file2save.getAbsolutePath();
    }
}

2.2、配置文件application.yml

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server:
  port: 8007

eureka:
  client:
    serviceUrl:
      defaultZone: http://127.0.0.1:9000/eureka/
  instance:
    prefer-ip-address: true

spring:
  application:
    name: springcloud-ms-file-upload
  http:
    multipart:
      max-file-size: 50MB #默认1M
      max-request-size: 100MB #默认10M

2.3、上传服务启动类

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import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@EnableEurekaClient
@SpringBootApplication
public class FileUploadApplication {

    public static void main(String[] args) {
        SpringApplication.run(FileUploadApplication.class, args);
    }
}

3、客户端

3.1、引入依赖

需要引入额外的依赖：

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<dependency>
    <groupId>io.github.openfeign.form</groupId>
    <artifactId>feign-form</artifactId>
    <version>3.0.3</version>
</dependency>
<dependency>
    <groupId>io.github.openfeign.form</groupId>
    <artifactId>feign-form-spring</artifactId>
    <version>3.0.3</version>
</dependency>
<dependency>
    <groupId>commons-fileupload</groupId>
    <artifactId>commons-fileupload</artifactId>
    <version>1.3.3</version>
</dependency>

完整依赖：

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<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.4.3.RELEASE</version>
</parent>

<properties>
    <spring.cloud.version>Camden.SR4</spring.cloud.version>
</properties>

<dependencies>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-eureka-server</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-feign</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</artifactId>
    </dependency>

    <dependency>
        <groupId>io.github.openfeign.form</groupId>
        <artifactId>feign-form</artifactId>
        <version>3.0.3</version>
    </dependency>
    <dependency>
        <groupId>io.github.openfeign.form</groupId>
        <artifactId>feign-form-spring</artifactId>
        <version>3.0.3</version>
    </dependency>
    <dependency>
        <groupId>commons-fileupload</groupId>
        <artifactId>commons-fileupload</artifactId>
        <version>1.3.3</version>
    </dependency>

</dependencies>

<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>${spring.cloud.version}</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>

3.2、UploadFeignClient

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import feign.codec.Encoder;
import feign.form.spring.SpringFormEncoder;
import org.springframework.cloud.netflix.feign.FeignClient;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestPart;
import org.springframework.web.multipart.MultipartFile;

@FeignClient(name = "springcloud-ms-file-upload", configuration = UploadFeignClient.MultipartConfig.class)
public interface UploadFeignClient {

    @RequestMapping(value = "upload", method = RequestMethod.POST, consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
    String upload(@RequestPart(value = "file") MultipartFile file);

    @Configuration
    class MultipartConfig {
        @Bean
        public Encoder feignFormEncoder() {
            return new SpringFormEncoder();
        }
    }
}

注意：上传的文件使用@RequestPart注解

3.3、配置文件application.yml

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server:
  port: 8003

eureka:
  client:
    serviceUrl:
      defaultZone: http://127.0.0.1:9000/eureka/
  instance:
    prefer-ip-address: true

spring:
  application:
    name: springcloud-client

3.4、客户端上传接口

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import org.lee.springcloud.client.UploadFeignClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestPart;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.annotation.Resource;

@RestController
public class UploadController {

    @Resource
    private UploadFeignClient uploadFeignClient;

    @RequestMapping(value = "upload", method = RequestMethod.POST)
    public String fileUplaod(@RequestPart(value = "file") MultipartFile file) {
        return uploadFeignClient.upload(file);
    }
}

3.5、客户端启动类

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import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.feign.EnableFeignClients;

@EnableFeignClients
@EnableDiscoveryClient
@SpringBootApplication
public class ClientApplication {

    public static void main(String[] args) {
        SpringApplication.run(ClientApplication.class, args);
    }
}

4、文件上传测试

首先启动Eureka注册中心，再启动文件上传服务，最后启动客服端，
通过Postman进行文件上传测试，访问客户端文件上传接口：http://127.0.0.1:8003/upload。
Body中选择form-data，参数名，file，类型：file，value：选择上传的文件，点击Send即可。
postman_upload

 

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