Content-Length 分隔的消息体过早结束

Question

我调试了代码，我得到的错误是在obj.close() 语句之后。我只需要 S3 对象的最后修改日期。

AmazonS3 s3 = AmazonS3ClientBuilder
              .standard()
              .withCredentials(new DefaultAWSCredentialsProviderChain())
              .withRegion(Regions.US_EAST_1)
              .build();
    S3Object obj = null;
    try {
        obj = s3.getObject("bucketName","abc/1.txt");
    
        obj.getObjectContent();
        Date date = obj.getObjectMetadata().getLastModified();
    
       System.out.println(date);
    }finally {
        if(obj!=null) {
            obj.close();
        }   
    }

错误：

org.apache.http.ConnectionClosedException: Premature end of Content-Length delimited message body (expected: 12; received: 0
    at org.apache.http.impl.io.ContentLengthInputStream.read(ContentLengthInputStream.java:180)
    at org.apache.http.impl.io.ContentLengthInputStream.read(ContentLengthInputStream.java:200)
    at org.apache.http.impl.io.ContentLengthInputStream.close(ContentLengthInputStream.java:103)
    at org.apache.http.impl.execchain.ResponseEntityProxy.streamClosed(ResponseEntityProxy.java:140)
    at org.apache.http.conn.EofSensorInputStream.checkClose(EofSensorInputStream.java:228)
    at org.apache.http.conn.EofSensorInputStream.close(EofSensorInputStream.java:174)
    at com.amazonaws.internal.SdkFilterInputStream.close(SdkFilterInputStream.java:99)
    at com.amazonaws.event.ProgressInputStream.close(ProgressInputStream.java:211)
    at com.amazonaws.util.IOUtils.closeQuietly(IOUtils.java:70)
    at com.amazonaws.services.s3.internal.S3AbortableInputStream.close(S3AbortableInputStream.java:185)
    at com.amazonaws.internal.SdkFilterInputStream.close(SdkFilterInputStream.java:99)
    at com.amazonaws.services.s3.model.S3ObjectInputStream.close(S3ObjectInputStream.java:136)
    at com.amazonaws.internal.SdkFilterInputStream.close(SdkFilterInputStream.java:99)
    at com.amazonaws.internal.SdkFilterInputStream.close(SdkFilterInputStream.java:99)
    at com.amazonaws.event.ProgressInputStream.close(ProgressInputStream.java:211)
    at java.base/java.io.FilterInputStream.close(FilterInputStream.java:180)
    at com.amazonaws.internal.SdkFilterInputStream.close(SdkFilterInputStream.java:99)
    at com.amazonaws.services.s3.model.S3ObjectInputStream.close(S3ObjectInputStream.java:136)
    at com.amazonaws.services.s3.model.S3Object.close(S3Object.java:225)

Answer 1

发生这种情况是因为您调用了s3.getObject()，但没有读取它检索到的内容。 SDK 假定如果您检索到对象数据，您就会使用它。

如果您只关心对象元数据，您应该直接在AmazonS3 客户端对象上调用getObjectMetadata()。