spring boot集成阿里云oos实现文件上传下载预览

Spring Boot集成阿里云OOS实现文件上传、下载和预览，可以参考以下步骤：

1. 引入OSS SDK依赖

在Spring Boot的pom.xml文件中添加OSS SDK依赖：

<dependency>
    <groupId>com.aliyun.oss</groupId>
    <artifactId>aliyun-sdk-oss</artifactId>
    <version>3.12.0</version>
</dependency>

2. 配置OSS客户端

在Spring Boot的配置文件application.properties或application.yml中配置OSS客户端：

aliyun:
  oss:
    endpoint: oss-cn-hangzhou.aliyuncs.com
    accessKeyId: your_access_key_id
    accessKeySecret: your_access_key_secret
    bucketName: your_bucket_name

3. 实现文件上传

在Controller中实现文件上传的方法，示例代码如下：

@PostMapping("/upload")
public String uploadFile(@RequestParam("file") MultipartFile file) throws IOException {
    String fileName = file.getOriginalFilename();
    // 创建OSS客户端实例
    OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);
    // 上传文件
    ossClient.putObject(bucketName, fileName, new ByteArrayInputStream(file.getBytes()));
    // 关闭OSS客户端
    ossClient.shutdown();
    return "上传成功！";
}

4. 实现文件下载

在Controller中实现文件下载的方法，示例代码如下：

@GetMapping("/download")
public void downloadFile(@RequestParam("fileName") String fileName, HttpServletResponse response) throws IOException {
    // 创建OSS客户端实例
    OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);
    // 下载文件
    OSSObject ossObject = ossClient.getObject(bucketName, fileName);
    InputStream inputStream = ossObject.getObjectContent();
    byte[] buffer = new byte[1024];
    int len;
    OutputStream outputStream = response.getOutputStream();
    while ((len = inputStream.read(buffer)) != -1) {
        outputStream.write(buffer, 0, len);
    }
    // 关闭流
    outputStream.close();
    inputStream.close();
    // 关闭OSS客户端
    ossClient.shutdown();
}

5. 实现文件预览

在Controller中实现文件预览的方法，示例代码如下：

@GetMapping("/preview")
public void previewFile(@RequestParam("fileName") String fileName, HttpServletResponse response) throws IOException {
    // 创建OSS客户端实例
    OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);
    // 下载文件到本地临时文件
    File tempFile = File.createTempFile("temp", fileName.substring(fileName.lastIndexOf(".")));
    ossClient.getObject(new GetObjectRequest(bucketName, fileName), tempFile);
    // 设置响应头
    response.setContentType("application/pdf");
    response.setHeader("Content-Disposition", "inline;filename=" + fileName);
    // 输出文件流
    FileInputStream inputStream = new FileInputStream(tempFile);
    OutputStream outputStream = response.getOutputStream();
    byte[] buffer = new byte[1024];
    int len;
    while ((len = inputStream.read(buffer)) != -1) {
        outputStream.write(buffer, 0, len);
    }
    // 关闭流
    outputStream.flush();
    outputStream.close();
    inputStream.close();
    // 删除临时文件
    tempFile.delete();
    // 关闭OSS客户端
    ossClient.shutdown();
}

以上就是Spring Boot集成阿里云OOS实现文件上传、下载和预览的步骤。注意：在实际开发中，需要根据具体的业务需求进行适当的修改和优化。