[英]java.lang.IllegalStateException: InputStream has already been read - do not use InputStreamResource if a stream needs to be read multiple times
I am trying to read a file from aws s3 bucket and set it as resource inside my spring batch reader class. 我正在尝试从aws s3存储桶读取一个文件,并将其设置为我的spring batch reader类中的资源。 When I test the application on aws lambda function I got below error.
当我在AWS Lambda函数上测试应用程序时,出现以下错误。 any suggestion experts?
有什么建议专家吗?
Caused by: java.lang.IllegalStateException: InputStream has already been read - do not use InputStreamResource if a stream needs to be read multiple times
at org.springframework.core.io.InputStreamResource.getInputStream(InputStreamResource.java:97) ~[task/:na]
at org.springframework.batch.item.file.DefaultBufferedReaderFactory.create(DefaultBufferedReaderFactory.java:34) ~[task/:na]
at org.springframework.batch.item.file.FlatFileItemReader.doOpen(FlatFileItemReader.java:266) ~[task/:na]
at org.springframework.batch.item.support.AbstractItemCountingItemStreamItemReader.open(AbstractItemCountingItemStreamItemReader.java:146) ~[task/:na]
Class to read from s3 bucket
@Service
public class S3BucketProcessing {
private static final AmazonS3 s3 = AmazonS3ClientBuilder.standard().build();
public InputStreamResource readFile() throws IOException{
String bucketName = "mybuckey";
String key = "File.txt";
S3Object object = s3.getObject(new GetObjectRequest(bucketName, key));
return new InputStreamResource(object.getObjectContent());
}
Spring batch reader class Spring批处理阅读器类
@Component
public class MyReader extends FlatFileItemReader<MyEntity> {
MyLineMapper mapper;
MyTokenizer tokenizer;
S3BucketProcessing s3BucketProcessing;
@Autowired
public MyReader(MyTokenizer tokenizer, MyLineMapper mapper, S3BucketProcessing s3BucketProcessing) throws Exception{
LOG.info("CardCustomerNotificationReader constructor");
this.mapper = mapper;
this.tokenizer = tokenizer;
this.s3BucketProcessing= s3BucketProcessing;
this.setResource(s3BucketProcessing.readFile());
mapper.setLineTokenizer(tokenizer);
this.setLineMapper(mapper);
}
}
The docs suggest using ByteArrayResource to cache the content in memory, rather than InputStreamResource. 该文档建议使用ByteArrayResource将内容缓存在内存中,而不是InputStreamResource。
https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/core/io/InputStreamResource.html https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/core/io/InputStreamResource.html
Just change the returns part like this: 只需更改退货部分,如下所示:
//As suggested by berzerk
byte[] content = IOUtils.toByteArray(object.getObjectContent());
//Then
return new ByteArrayResource( content );
Instead of returning InputStreamResource , you shud return content of the stream may be byte[ ]. 您不必返回InputStreamResource,而是将流的返回内容设为byte []。
byte[] content = IOUtils.toByteArray(object.getObjectContent()); byte [] content = IOUtils.toByteArray(object.getObjectContent()); return content ;
返回内容;
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