文件上傳

簡(jiǎn)介

文件上傳，是指將本地圖片、視頻、音頻等文件上傳到服務(wù)器，供其他用戶瀏覽或下載的過程。
文件上傳在項(xiàng)目中應(yīng)用非常廣泛，我們經(jīng)常發(fā)微博、發(fā)微信朋友圈都用到了文件上傳功能。

本地存儲(chǔ)

前端代碼：

<form action="/upload"method="post"enctype="multipart/form-data">
	頭像：<input type="file"name="image"><br>
<input type="submit"value="提交">
</form>

后端代碼：

@PostMapping("/upload")
@ApiOperation("文件上傳")
public Result<String> upload(MultipartFile file){
  log.info("文件上傳：{}",file);


  // 原始文件名
   String originalFilename = file.getOriginalFilename();
   // 后綴名
   String extension = originalFilename.substring(originalFilename.lastIndexOf("."));
   // 構(gòu)造新文件名稱
   String fileName = UUID.randomUUID().toString()+extension;
   // 將文件存儲(chǔ)到服務(wù)器的磁盤目錄中
  	file.transferTo(new File("E:\\Vue\\imgs"+fileName));
   
   return Result.success();

阿里云OSS對(duì)象存儲(chǔ)

對(duì)于阿里云的oss的使用可閱讀對(duì)象存儲(chǔ) OSS官方文檔

導(dǎo)入依賴

<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，則需要添加jaxb相關(guān)依賴。添加jaxb相關(guān)依賴示例代碼如下：文章來源地址http://www.zghlxwxcb.cn/news/detail-718073.html

<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>

代碼編寫

1. 編寫AliOssUtil工具類用作上傳

@Data
@AllArgsConstructor
@Slf4j
public class AliOssUtil {

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

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

        // 創(chuàng)建OSSClient實(shí)例。
        OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);

        try {
            // 創(chuàng)建PutObject請(qǐng)求。
            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();
            }
        }

        //文件訪問路徑規(guī)則 https://BucketName.Endpoint/ObjectName
        StringBuilder stringBuilder = new StringBuilder("https://");
        stringBuilder
                .append(bucketName)
                .append(".")
                .append(endpoint)
                .append("/")
                .append(objectName);

        log.info("文件上傳到:{}", stringBuilder.toString());

        return stringBuilder.toString();
    }
}

2. 相關(guān)配置

  alioss:
    endpoint: oss-cn-hangzhou.aliyuncs.com
    access-key-id: your-access-key-id
    access-key-secret: your-access-key-secret
    bucket-name: your-bucket-name

3. 讀取配置文件

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

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

}

4. 給屬性賦值，并創(chuàng)建對(duì)象

/**
 * 配置類，用于創(chuàng)建AliOssUtil對(duì)象
 */
@Configuration
@Slf4j
public class OssConfiguration {

    @Bean
    public AliOssUtil aliOssUtil(AliOssProperties aliOssProperties){
        log.info("開始創(chuàng)建阿里云文件上傳工具類對(duì)象：{}",aliOssProperties);
        return new AliOssUtil(aliOssProperties.getEndpoint(),
                aliOssProperties.getAccessKeyId(),
                aliOssProperties.getAccessKeySecret(),
                aliOssProperties.getBucketName());
    }
}

5. 編寫上傳文件接口

@Autowired
private AliOssUtil aliOssUtil;

@PostMapping("/upload")
@ApiOperation("文件上傳")
public Result<String> upload(MultipartFile file){
    log.info("文件上傳：{}",file);

    try {
        // 原始文件名
        String originalFilename = file.getOriginalFilename();

        // 后綴名
        String extension = originalFilename.substring(originalFilename.lastIndexOf("."));

        // 構(gòu)造新文件名稱
        String fileName = UUID.randomUUID().toString()+extension;
        // 文件的請(qǐng)求路徑
        String filePath = aliOssUtil.upload(file.getBytes(), fileName);
        // 返回請(qǐng)求路徑用于回顯圖片
        return Result.success(filePath);
    } catch (IOException e) {
        log.error("文件上傳失?。簕}",e);
    }
    
    return null;
}

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