java oss 下载文件

Java利用OSS实现下载文件的步骤如下：
1. 创建OSSClient对象，连接到OSS服务。
2. 构造GetObjectRequest对象，设置Bucket名称和Object名称。
3. 调用OSSClient的getObject方法，获取OSSObject对象。
4. 从OSSObject对象中获取输入流，将文件内容读取到本地文件中。
5. 关闭输入流和OSSClient对象。

以下是示例代码：

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.model.GetObjectRequest;
import com.aliyun.oss.model.OSSObject;

public class DownloadFile {
    public static void main(String[] args) throws IOException {
        // 创建OSSClient对象
        String endpoint = "yourEndpoint";
        String accessKeyId = "yourAccessKeyId";
        String accessKeySecret = "yourAccessKeySecret";
        String bucketName = "yourBucketName";
        OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);

        // 构造GetObjectRequest对象
        String objectName = "yourObjectName";
        GetObjectRequest getObjectRequest = new GetObjectRequest(bucketName, objectName);

        // 下载文件
        OSSObject ossObject = ossClient.getObject(getObjectRequest);
        InputStream inputStream = ossObject.getObjectContent();
        OutputStream outputStream = new FileOutputStream(new File("yourLocalFilePath"));
        byte[] buffer = new byte[1024];
        int len;
        while ((len = inputStream.read(buffer)) != -1) {
            outputStream.write(buffer, 0, len);
        }
        outputStream.close();
        inputStream.close();

        // 关闭OSSClient对象
        ossClient.shutdown();
    }
}