如何获取OSS文件的访问地址

管理员您好，请问如何修改权限？
我们用OssSample运行结果总是只传了一个0kb文件上来，打开里面显示“OSS Sample”

麻烦您帮我们看下，这是我们的运行结果
----- IsBucketExist -----
false
----- CreateBucket -----
Success
----- PutObjectWithData ------
Success
----- !GetObjectWithIfMatch ------
Success
<?xml version="1.0" ?>
<Error>
    <Code>
        PreconditionFailed
    </Code>
    <Message>
        At least one of the pre-conditions you specified did not hold.
    </Message>
    <Condition>
        If-Match
    </Condition>
    <RequestId>
        7c29c02f-6223-c401-4a54-37220933bf43
    </RequestId>
    <HostId>
        storage.aliyun.com
    </HostId>
</Error>
----- GettObjectWithIfMatch ------
Exception in thread "main" java.lang.NullPointerException
    at com.aliyun.oss.api.Utils.saveInputStreamToFile(Utils.java:182)
    at com.aliyun.oss.api.OSSClient.getObjectToFile(OSSClient.java:669)
    at OssSample.main(OssSample.java:146)

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