java 代码 oss 下载

好的，以下是使用 Java SDK 实现 OSS 下载的示例代码：

import java.io.File;
import java.io.IOException;

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

public class DownloadObjectSample {
    private static String endpoint = "yourEndpoint";
    private static String accessKeyId = "yourAccessKeyId";
    private static String accessKeySecret = "yourAccessKeySecret";
    private static String bucketName = "yourBucketName";
    private static String objectName = "yourObjectName";
    private static String localFile = "yourLocalFile";

    public static void main(String[] args) throws IOException {
        // 创建OSSClient实例
        OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);

        try {
            // 下载OSS文件到本地文件。如果指定的本地文件存在会覆盖，不存在则新建。
            ossClient.getObject(new GetObjectRequest(bucketName, objectName), new File(localFile));
        } 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.getErrorCode());
            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 {
            // 关闭OSSClient实例
            ossClient.shutdown();
        }
    }
}

在这个示例代码中，您需要替换 `endpoint`、`accessKeyId`、`accessKeySecret`、`bucketName`、`objectName` 和 `localFile` 这几个参数的值为您自己的实际值。其中，`endpoint` 是 OSS 服务的访问域名，`accessKeyId` 和 `accessKeySecret` 是您的 Access Key ID 和 Access Key Secret，`bucketName` 是您要下载文件所在的存储空间名称，`objectName` 是您要下载的文件名，`localFile` 是您要将文件下载到本地的路径和文件名。

希望对您有帮助！