使用Zuul上传文件

一介绍

对于小文件（1M以内上传），无须任何处理，即可正常上传。对于大文件（10M以上）上传，需要为上传路径添加/zuul前缀。也可使用zuul.servlet-path自定义前缀。

假设zuul.routes.microservice-file-upload=/microservice-file-upload/**

如果http://{HOST}:{PORT}/upload是微服务microservice-file-upload的上传路径，则可使用Zuul的/zuul/microservice-file-upload/upload路径上传大文件。

如果Zuul使用了Ribbon做负载均衡，那么对于超大的文件（例如500M），需要提高超时设置，例如：

hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds: 60000
ribbon:
  ConnectTimeout: 3000
  ReadTimeout: 60000

二实例

1 创建Maven工程，创建项目microservice-file-upload，并添加以下依赖：

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

2 在启动类上添加@SpringBootApplication和@EnableEurekaClient

package com.itmuch.cloud.study;

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

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

3 编写Controller

package com.itmuch.cloud.study.controller;

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

import org.springframework.stereotype.Controller;
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.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;

@Controller
public class FileUploadController {
  /**
   * 上传文件
   * 测试方法：
   * 有界面的测试：http://localhost:8050/index.html
   * 使用命令：curl -F "file=@文件全名" localhost:8050/upload
   * ps.该示例比较简单，没有做IO异常、文件大小、文件非空等处理
   * @param file 待上传的文件
   * @return 文件在服务器上的绝对路径
   * @throws IOException IO异常
   */
  @RequestMapping(value = "/upload", method = RequestMethod.POST)
  public @ResponseBody String handleFileUpload(@RequestParam(value = "file", required = true) MultipartFile file) throws IOException {
    byte[] bytes = file.getBytes();
    File fileToSave = new File(file.getOriginalFilename());
    FileCopyUtils.copy(bytes, fileToSave);
    return fileToSave.getAbsolutePath();
  }
}

4 配置application.yml

server:
  port: 8050
eureka:
  client:
    serviceUrl:
      defaultZone:http://localhost:8761/eureka/
  instance:
    prefer-ip-address: true
spring:
  application:
    name: microservice-file-upload
  http:
    multipart:
      max-file-size: 500Mb      # Max file size，默认1M
      max-request-size: 1000Mb   # Max request size，默认10M

三测试

1 启动eureka

2 启动microservice-file-upload

3 启动microservice-gateway-zuul

4 用postman的 http://localhost:8050/upload上传小文件和大文件，都能上传成功

5 测试Zuul上传小文件，上传成功，用postman测试： http://localhost:8040/microservice-file-upload/upload

6 测试Zuul上传大文件，上传失败，用postman测试： http://localhost:8040/microservice-file-upload/upload

7 测试Zuul上传大文件，上传失败，用postman测试： http://localhost:8040/zuul/microservice-file-upload/upload

8 修正一下zuul的配置如下

server:
  port: 8040
spring:
  application:
    name: microservice-gateway-zuul
eureka:
  client:
    service-url:
      defaultZone:http://localhost:8761/eureka/
  instance:
    prefer-ip-address: true
# 上传大文件得将超时时间设置长一些，否则会报超时异常。以下几行超时设置来自http://cloud.spring.io/spring-cloud-static/Camden.SR3/#_uploading_files_through_zuul
hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds: 60000
ribbon:
  ConnectTimeout: 3000
  ReadTimeout: 60000

测试Zuul上传大文件，上传成功，用postman测试： http://localhost:8040/zuul/microservice-file-upload/upload

四参考

https://www.cnblogs.com/shimh/p/6094410.html

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