SpringCloud-通过Zuul上传文件

最新推荐文章于 2021-01-24 18:15:22 发布

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本文介绍了如何在SpringCloud中通过Zuul实现文件上传功能。首先讲解了普通微服务的上传实现，然后重点阐述了利用Zuul进行文件上传的步骤，包括配置Zuul应用、调整YAML文件以处理超时问题，以及解决可能遇到的内存溢出异常。通过这些设置，可以成功地在Zuul网关上完成文件上传操作。

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官档地址：

https://cloud.spring.io/spring-cloud-static/Greenwich.RELEASE/single/spring-cloud.html#_router_and_filter_zuul

1.普通微服务实现上传功能

application.yml

server:
  port: 8050
eureka:
  client:
    serviceUrl:
      defaultZone: http://user:password123@localhost:8761/eureka/
  instance:
    prefer-ip-address: true
spring:
  application:
    name: microservice-file-upload
  http:
    multipart:
      max-file-size: 2000Mb      # Max file size，默认1M
      max-request-size: 2500Mb   # Max request size，默认10M

FileUploadController.java

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();
  }
}

FileUploadApplication.java

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);
  }
}

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.itmuch.cloud</groupId>
  <artifactId>microservice-file-upload</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <!-- 引入spring boot的依赖 -->
  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.4.2.RELEASE</version>
  </parent>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <java.version>1.8</java.version>
  </properties>

  <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>

  <!-- 引入spring cloud的依赖 -->
  <dependencyManagement>
    <dependencies>
      <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-dependencies</artifactId>
        <version>Camden.SR2</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
    </dependencies>
  </dependencyManagement>

  <!-- 添加spring-boot的maven插件 -->
  <build>
    <plugins>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
      </plugin>
    </plugins>
  </build>
</project>

index.html

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<form method="POST" enctype="multipart/form-data" action="/upload">
		File to upload: 
		<input type="file" name="file">
		<input type="submit" value="Upload">
	</form>
</body>
</html>

2.通过Zuul进行文件上传

ZuulApplication.java

package com.itmuch.cloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.zuul.EnableZuulProxy;

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

application.yml

spring:
  application:
    name: microservice-gateway-zuul
server:
  port: 8040
eureka:
  client:
    service-url:
      defaultZone: http://user:password123@localhost:8761/eureka
  instance:
    prefer-ip-address: true
hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds: 60000
ribbon:
  ConnectTimeout: 3000
  ReadTimeout: 60000

官档解释：

注意1. 路径上加上/zuul/,会绕过springMVC的DispatcherServlet

解决异常：the request was rejected because ite size ...exceeds...

注意2. 加上如下配置，设置hystrix的超时时间【经过Zuul的请求都会用Hystrix包裹，可查看其包含的注解@EnableCircuitBreaker】和ribbon的超时时间
hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds: 60000 ribbon: ConnectTimeout: 3000 ReadTimeout: 60000

解决异常：ZuulExcption TIMEOUT

注意3. eclipse 设置堆内存设置大一点，并且最大堆内存和最小堆内存一致 -Xms4000M -Xmx4000M

解决异常：运行时异常 OutOfMemoryExcepion： java heap space

pom.xml

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

以上通过Zuul即可成功实现上传。

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