Feign【文件上传】

话不多说，上代码。。。。

项目公共依赖配置：

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.3.RELEASE</version>
        <relativePath/>
</parent>

<properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <spring-cloud.version>Finchley.RELEASE</spring-cloud.version>
</properties>

<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、创建注册中心工程

a、eureka server工程pom依赖：

<!-- 加上上面的公共依赖 -->

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <!-- springboot web -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
</dependencies>

<build>
   <plugins>
      <plugin>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-maven-plugin</artifactId>
      </plugin>
   </plugins>
</build>

b、eureka server工程启动类：

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


@SpringBootApplication
@EnableEurekaServer
public class EurekaServerApplication {

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

c、eureka server工程配置文件：eureka-serversrcmain esourcesootstrap.yml

server:
  port: 8761
eureka:
  instance:
    hostname: localhost
  client:
    registerWithEureka: false
    fetchRegistry: false
    serviceUrl:
      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

2、创建demo-server工程：

a、demo-server工程pom依赖：

<!-- 加上上面的公共依赖 -->
 
<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>

</dependencies>
<build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
</build>

b、demo-server工程启动类：

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

@SpringBootApplication
@EnableDiscoveryClient
public class FileServerApplication {

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

c、编写模拟代码：

import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

@RestController
public class FeignUploadController {

    @PostMapping(value = "/uploadFile/server", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
    public String fileUploadServer(MultipartFile file ) throws Exception{
        String originalFilename = file.getOriginalFilename();
        System.out.println("originalFilename----->"+originalFilename);
　　　　 //上传。。。。
        return originalFilename;
    }

}

d、demo-server工程配置文件：demo-serversrcmain esourcesapplication.yml

server:
  port: 8012
spring:
  application:
    name: demo-server

eureka:
  server:
    enableSelfPreservation: false
  client:
    serviceUrl:
      defaultZone: http://${eureka.host:127.0.0.1}:${eureka.port:8761}/eureka/
  instance:
    prefer-ip-address: true

3、创建demo-client工程：

a、demo-client工程pom依赖：

<!--加上上面的公共依赖-->

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

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>

        <!-- Spring Cloud OpenFeign的Starter的依赖 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>

        <!-- Feign文件上传依赖-->
        <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>

</dependencies>
<build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
</build>

b、demo-client工程启动类：

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

@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
public class FeignFileUploadApplication {

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

c、上传相关代码：

import feign.form.spring.SpringFormEncoder;
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;


/**
 * Feign文件上传Configuration
 */
@Configuration
public class FeignMultipartSupportConfig {

    @Bean
    @Primary
    @Scope("prototype")
    public Encoder multipartFormEncoder() {
        return new SpringFormEncoder();
    }
}

import cn.springcloud.book.feign.config.FeignMultipartSupportConfig;
import org.springframework.cloud.openfeign.FeignClient;
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(value = "demo-server", configuration = FeignMultipartSupportConfig.class)
public interface FileUploadFeignService {

    /***
     * 1.produces,consumes必填
     * 2.注意区分@RequestPart和RequestParam，不要将
     * @RequestPart(value = "file") 写成@RequestParam(value = "file")
     * @param file
     * @return
     */
    @RequestMapping(method = RequestMethod.POST, value = "/uploadFile/server",
            produces = {MediaType.APPLICATION_JSON_UTF8_VALUE},
            consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
    public String fileUpload(@RequestPart(value = "file") MultipartFile file);

}

import cn.springcloud.book.feign.service.FileUploadFeignService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import java.nio.charset.StandardCharsets;

@RestController
@RequestMapping("/feign")
public class FeignUploadController {

    @Autowired
    private FileUploadFeignService fileUploadFeignService;

    @PostMapping(value = "/upload", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
public String imageUpload(MultipartFile file) throws Exception {
        String s = fileUploadFeignService.fileUpload(file);
        System.out.println("s----------->" + s);
        return s;
    }

}

d、demo-client工程配置文件：demo-clientsrcmain esourcesapplication.yml

server:
  port: 8011
spring:
  application:
    name: feign-upload-client

eureka:
  client:
    service-url:
           defaultZone: http://localhost:8761/eureka

3、使用测试工具，测试接口，这里使用的是RestletClient：

可以看到已经正常的返回了图片的名字！！！

注意事项：

@RequestMapping(method = RequestMethod.POST, value = "/uploadFile/server", produces = {MediaType.APPLICATION_JSON_UTF8_VALUE}, consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
produces、consumer必填。

@RequestPart(value = "file")，不是@RequestParam