C语言：关于动态内存管理我到底应该懂些什么？看了我这篇你就通透了。-CFANZ编程社区

一：开通阿里云对象存储服务oss,创建bucket，获得密钥

二：在程序中集成上传文件功能

1.连接阿里云OSS对象存储服务器

声明一个配置属性的文件用于传入连接的参数

package com.sky.properties;

import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

@Component
@ConfigurationProperties(prefix = "sky.alioss")
@Data
public class AliOssProperties {

    private String endpoint;
    private String accessKeyId;
    private String accessKeySecret;
    private String bucketName;

}

为了充分解耦，声明一个配置属性的类，从外部注入连接的属性值

@Component： 标注Spring管理的Bean，使用@Component注解在一个类上，表示将此类标记为Spring容器中的一个Bean
@data:Lombok注解用于生成对应的getter和setter方法

@ConfigurationProperties(prefix = "sky.alioss")：负责属性的批量注入

application.yml主配置文件中的配置信息：

spring:
  profiles:
用开发环境的配置文件
    active: dev

sky:
  alioss:
    endpoint: ${sky.alioss.endpoint}
    bucket-name: ${sky.alioss.bucket-name}
    access-key-id: ${sky.alioss.access-key-id}
    access-key-secret: ${sky.alioss.access-key-secret}

真正是信息配置在：开发环境中：application-dev.yml中

通过配置多份不同环境的配置文件，再通过打包命令指定需要打包的内容之后进行区分打包

sky:
 
  alioss:
    endpoint: oss-cn-beijing.aliyuncs.com
    bucket-name:  waimaiguo
    access-key-id: ***************
    access-key-secret: *************

填写阿里云相关信息，用于连接阿里云

三：封装一个aliyunOssUtil工具类，用于上传文件并拼接返回上传的文件的路径

package com.sky.utils;

import com.aliyun.oss.ClientException;
import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.OSSException;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.extern.slf4j.Slf4j;
import java.io.ByteArrayInputStream;

@Data
@AllArgsConstructor
@Slf4j
public class AliOssUtil {

    private String endpoint;
    private String accessKeyId;
    private String accessKeySecret;
    private String bucketName;

    /**
     * 文件上传
     *
     * @param bytes
     * @param objectName
     * @return
     */
    public String upload(byte[] bytes, String objectName) {

        // 创建OSSClient实例。
        OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);

        try {
            // 创建PutObject请求就是把图片上传到阿里云OSS上。
            ossClient.putObject(bucketName, objectName, new ByteArrayInputStream(bytes));
        } catch (OSSException oe) {
            System.out.println("Caught an OSSException, which means your request made it to OSS, "
                    + "but was rejected with an error response for some reason.");
            System.out.println("Error Message:" + oe.getErrorMessage());
            System.out.println("Error Code:" + oe.getErrorCode());
            System.out.println("Request ID:" + oe.getRequestId());
            System.out.println("Host ID:" + oe.getHostId());
        } catch (ClientException ce) {
            System.out.println("Caught an ClientException, which means the client encountered "
                    + "a serious internal problem while trying to communicate with OSS, "
                    + "such as not being able to access the network.");
            System.out.println("Error Message:" + ce.getMessage());
        } finally {
            if (ossClient != null) {
                ossClient.shutdown();
            }
        }

        //文件访问路径规则 https://BucketName.Endpoint/ObjectName
        StringBuilder stringBuilder = new StringBuilder("https://");
        stringBuilder
                .append(bucketName)
                .append(".")
                .append(endpoint)
                .append("/")
                .append(objectName);

        log.info("文件上传到:{}", stringBuilder.toString());

        return stringBuilder.toString();
    }
}

四：创建一个配置类用于生成工具类的bean交给spring容器管理

package com.sky.config;


import com.sky.properties.AliOssProperties;
import com.sky.utils.AliOssUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
@Slf4j
public class OssConfiguration {

    @Bean
//需要把属性通过参数注入其中
    public AliOssUtil aliOssUtil(AliOssProperties aliOssProperties){
        log.info("创建阿里云上传文件对象：{}",aliOssProperties);
        return new AliOssUtil(aliOssProperties.getEndpoint(),
                aliOssProperties.getAccessKeyId(),
                aliOssProperties.getAccessKeySecret(),
                aliOssProperties.getBucketName());
    }
}

五：创建一个controller接受前端的请求


import com.sky.constant.MessageConstant;
import com.sky.result.Result;
import com.sky.utils.AliOssUtil;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
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.io.IOException;
import java.util.UUID;

@RestController
@RequestMapping("/admin/common")
@Api (tags = "通用接口")
@Slf4j
public class commonController {
    @Autowired
    private AliOssUtil aliOssUtil;
    @PostMapping("/upload")
    @ApiOperation("文件上传")
    public Result<String> upload(MultipartFile file){

        try {
            //接下来就是拼接文件名
            String originalFilename = file.getOriginalFilename();
            String substring = originalFilename.substring(originalFilename.lastIndexOf("."));
            String objectString= UUID.randomUUID()+substring;
            //第一参数为：文件的输入流；第二个参数为上传文件的名称；
            String upload = aliOssUtil.upload(file.getBytes(), objectString);
            return Result.success(upload);
        } catch (IOException e) {
            System.out.println("文件上传异常:"+e);
        }

        return Result.error(MessageConstant.UPLOAD_FAILED);
    }

}

MultipartFile file：用于接收前端文件类型的参数

UUID类负责生成一个新的文件名称；防止文件名称重复
```
return Result.success(upload)
```
最终返回给前端一个url,前端会请求这个路径回显图片