黑马程序员JavaWeb学习笔记-文件上传

文件上传

https://www.bilibili.com/video/BV1m84y1w7Tb/?p=150&spm_id_from=pageDriver&vd_source=62f4901d4d947272c439194b87ec6698

当报错500时，服务端出现错误，因为默认最大为1M

在application.properties里面修改

文件上传的几个函数

本地存储 Controller 层的代码

import com.itheima.pojo.Result;
import com.itheima.utils.AliOSSUtils;
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.RestController;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.io.IOException;
import java.util.UUID;

@Slf4j
@RestController
public class UploadController {

    @Autowired
    private AliOSSUtils aliOSSUtils;
    //本地存储文件
    @PostMapping("/upload")
    public Result upload(String username , Integer age , MultipartFile image) throws Exception {
        log.info("文件上传: {}, {}, {}", username, age, image);
        //获取原始文件名 - 1.jpg  123.0.0.jpg
        String originalFilename = image.getOriginalFilename();

        //构造唯一的文件名 (不能重复) - uuid(通用唯一识别码) de49685b-61c0-4b11-80fa-c71e95924018
        int index = originalFilename.lastIndexOf(".");
        String extname = originalFilename.substring(index);
        String newFileName = UUID.randomUUID().toString() + extname;
        log.info("新的文件名: {}", newFileName);

        //将文件存储在服务器的磁盘目录中 E:\images
        image.transferTo(new File("E:\\images\\"+newFileName));
      
        return Result.success();
    }
}

阿里云oss-使用步骤

<!--阿里云官方文档 对象存储OSS-->
<dependency>
	<groupId>com.aliyun.oss</groupId>
  <artifactId>aliyun-sdk-oss</artifactId>
  <version>3.15.1</version>
</dependency>

如果使用的是Java 9及以上的版本，则需要添加jaxb相关依赖。添加jaxb相关依赖

<dependency>
  <groupId>javax.xml.bind</groupId>
  <artifactId>jaxb-api</artifactId>
  <version>2.3.1</version>
</dependency>
<dependency>
  <groupId>javax.activation</groupId>
  <artifactId>activation</artifactId>
  <version>1.1.1</version>
</dependency>
<!-- no more than 2.3.3-->
<dependency>
  <groupId>org.glassfish.jaxb</groupId>
  <artifactId>jaxb-runtime</artifactId>
  <version>2.3.3</version>
</dependency>

阿里云oss集成

import com.itheima.pojo.Result;
import com.itheima.utils.AliOSSUtils;
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.RestController;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.io.IOException;
import java.util.UUID;

@Slf4j
@RestController
public class UploadController {

    @Autowired
    private AliOSSUtils aliOSSUtils;
    
    @PostMapping("/upload")
    public Result upload(MultipartFile image) throws IOException {
        log.info("文件上传, 文件名: {}", image.getOriginalFilename());

        //调用阿里云OSS工具类进行文件上传
        String url = aliOSSUtils.upload(image);
        log.info("文件上传完成,文件访问的url: {}", url);

        return Result.success(url);
    }
}

utils

--AliOSSProperties

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

@Data
@Component
@ConfigurationProperties(prefix = "aliyun.oss")
public class AliOSSProperties {
    private String endpoint;
    private String accessKeyId;
    private String accessKeySecret;
    private String bucketName;
}

--AliOSSUtils

import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClientBuilder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import org.springframework.web.multipart.MultipartFile;
import java.io.*;
import java.util.UUID;
/**
 * 阿里云 OSS 工具类
 */
@Component
public class AliOSSUtils {

//    @Value("${aliyun.oss.endpoint}")
//    private String endpoint ;
//    @Value("${aliyun.oss.accessKeyId}")
//    private String accessKeyId ;
//    @Value("${aliyun.oss.accessKeySecret}")
//    private String accessKeySecret ;
//    @Value("${aliyun.oss.bucketName}")
//    private String bucketName ;

    @Autowired
    private AliOSSProperties aliOSSProperties;

    /**
     * 实现上传图片到OSS
     */
    public String upload(MultipartFile file) throws IOException {
        //获取阿里云OSS参数
        String endpoint = aliOSSProperties.getEndpoint();
        String accessKeyId = aliOSSProperties.getAccessKeyId();
        String accessKeySecret = aliOSSProperties.getAccessKeySecret();
        String bucketName = aliOSSProperties.getBucketName();

        // 获取上传的文件的输入流
        InputStream inputStream = file.getInputStream();

        // 避免文件覆盖
        String originalFilename = file.getOriginalFilename();
        String fileName = UUID.randomUUID().toString() + originalFilename.substring(originalFilename.lastIndexOf("."));

        //上传文件到 OSS
        OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);
        ossClient.putObject(bucketName, fileName, inputStream);

        //文件访问路径
        String url = endpoint.split("//")[0] + "//" + bucketName + "." + endpoint.split("//")[1] + "/" + fileName;
        // 关闭ossClient
        ossClient.shutdown();
        return url;// 把上传到oss的路径返回
    }
}

阿里云oss测试