SpingCloud中如何实现文件上传(不使用FastDFS)

功能实现后项目结构一览

建立微服务项目

引入依赖

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效果展示

功能实现后项目结构一览

建立微服务项目

我们把上传单独做成一个模块，遵循软件的开闭原则

引入依赖

在pom文件中引入依赖

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

新建yml文件配置项目信息

这里面的主要内容有两个，一是把upload服务注入到eureka容器中，二是限制文件上传的大小。

server:
  port: 8082
spring:
  application:
    name: upload-service
  servlet:
    multipart:
      max-file-size: 5MB # 限制文件上传的大小
# Eureka
eureka:
  client:
    service-url:
      defaultZone: http://127.0.0.1:10086/eureka
  instance:
    lease-renewal-interval-in-seconds: 5 # 每隔5秒发送一次心跳
    lease-expiration-duration-in-seconds: 10 # 10秒不发送就过期

新建项目启动引导类

记得书写注解

@SpringBootApplication
@EnableDiscoveryClient
public class LeyouUploadApplication {

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

Controller



@Controller
@RequestMapping("upload")
public class UploadController {

    @Autowired
    private UploadService uploadService;

    @PostMapping("image")
    public ResponseEntity<String> uploadImage(@RequestParam("file") MultipartFile file){
        String url =this.uploadService.uploadImage(file);
        if(StringUtils.isBlank(url)) {
            return ResponseEntity.badRequest().build();
        }
        return ResponseEntity.status(HttpStatus.CREATED).body(url);
    }
}

Service



@Service
public class UploadService {

    private static final List<String> CONTENT_TYPES = Arrays.asList("image/gif", "image/jpeg", "image/jpg");

    private static final Logger LOGGER = LoggerFactory.getLogger(UploadService.class);

    public String uploadImage(MultipartFile file) {
        String originalFilename = file.getOriginalFilename();

        //校验文件类型
        String contentType = file.getContentType();
        if(!CONTENT_TYPES.contains(contentType)) {
            LOGGER.info("文件类型不合法: {}", originalFilename);
            return null;
        }

        //校验文件内容
        try {
            BufferedImage  bufferedImage = ImageIO.read(file.getInputStream());
            if(bufferedImage == null) {
                LOGGER.info("文件内容不合法: {}", originalFilename);
                return null;
            }

            //保存到服务器
            file.transferTo(new File("G:\\software\\FastDFS\\image\\" + originalFilename));

            //返回url,进行回显
            return  "http://image.leyou.com/" + originalFilename;
        } catch (IOException e) {
            LOGGER.info("服务器内部错误: " + originalFilename);
            e.printStackTrace();
        }
        return null;
    }
}

网关配置


@Configuration
public class LeyouCorsConfiguration {
    @Bean
    public CorsFilter corsFilter() {
        //初始化cors配置
        CorsConfiguration configuration =new CorsConfiguration();

        //允许跨域的域名，如果要携带cookie不能写*.*代表所有域名都可以跨域访问
        configuration.addAllowedOrigin("http://manage.leyou.com");
        configuration.setAllowCredentials(true);  //允许携带cookie
        configuration.addAllowedMethod("*");   //代表所有请求方式,post。。。
        configuration.addAllowedHeader("*");    //允许携带任何头信息

        //初始化cors配置源对象
        UrlBasedCorsConfigurationSource corsConfigurationSource = new UrlBasedCorsConfigurationSource();
        corsConfigurationSource.registerCorsConfiguration("/**", configuration);

        //返回corsFilter实例，参数:cors配置源对象
        return new CorsFilter(corsConfigurationSource);
    }
}

Nginx配置

修改nginx.conf文件，要把upload服务的配置写在其他服务的配置之上，并且编写完成后记得重启nginx服务

	server {
        listen       80;
        server_name  api.leyou.com;

        proxy_set_header X-Forwarded-Host $host;
        proxy_set_header X-Forwarded-Server $host;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

    	# 上传路径的映射
		location /api/upload {	
			proxy_pass http://127.0.0.1:8082;
			proxy_connect_timeout 600;
			proxy_read_timeout 600;
			
			rewrite "^/api/(.*)$" /$1 break; 
        }
		
        location / {
			proxy_pass http://127.0.0.1:10010;
			proxy_connect_timeout 600;
			proxy_read_timeout 600;
        }
    }