写一段下载OSS文件的代码

以下是使用Java SDK下载OSS文件的示例代码：

import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.model.GetObjectRequest;
import com.aliyun.oss.model.OSSObject;

import java.io.*;

public class OSSDownloadFileDemo {

    public static void main(String[] args) {
        String endpoint = "<yourEndpoint>";
        String accessKeyId = "<yourAccessKeyId>";
        String accessKeySecret = "<yourAccessKeySecret>";
        String bucketName = "<yourBucketName>";
        String objectName = "<yourObjectName>";
        String localFilePath = "<yourLocalFilePath>";

        OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);
        try {
            OSSObject ossObject = ossClient.getObject(new GetObjectRequest(bucketName, objectName));
            InputStream inputStream = ossObject.getObjectContent();

            OutputStream outputStream = new FileOutputStream(localFilePath);
            byte[] buffer = new byte[1024];
            int bytesRead = 0;
            while ((bytesRead = inputStream.read(buffer)) != -1) {
                outputStream.write(buffer, 0, bytesRead);
            }
            outputStream.close();
            inputStream.close();

            System.out.println("File downloaded successfully.");

        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            ossClient.shutdown();
        }
    }
}

其中需要填写的参数包括：

- endpoint：OSS服务的API域名。
- accessKeyId和accessKeySecret：OSS账户的AccessKey ID和AccessKey Secret。
- bucketName：OSS存储空间的名称。
- objectName：要下载的文件在OSS中的路径。
- localFilePath：本地文件保存的路径。

该示例代码通过`ossClient.getObject()`方法获取OSS对象，然后通过输入流读取该对象的内容，并将内容写入到本地文件中。最后关闭输入流和输出流，并关闭OSS客户端。