关闭JAX-RS StreamingOutput的OutputStream [英] Closing JAX-RS StreamingOutput's OutputStream

问题描述

实施类是否应关闭 StreamingOutput 的 OutputStream ？

Should the StreamingOutput's OutputStream be closed by the implementing class?

java-doc不提供任何建议。我想它只是委托给底层的 ServletOutputStream 这意味着它不应该被关闭，但我的猜测可能是错误的:)而且javadoc引用了 MessageBodyWriter 接口，其中明确表示不得关闭输出流。

The java-doc does not give any recommendations. I guess it just delegates to the underlying ServletOutputStream which means it should not be closed, but my guess might be wrong :) Also the javadoc makes a reference to the MessageBodyWriter interface where it's explicitly said that the output stream must not be closed.

https://docs.oracle.com/javaee/7/api/javax/ws/rs/core/StreamingOutput.html

推荐答案

由于无法找到明确的答案，我看了一下球衣的来源是参考实施。在Jersey中， StreamingOutput 由 MessageBodyWriter 处理，只需调用 streamingOutput.write（os） [1]其中 os 是传递给的 OutputStream MessageBodyWriter 。这很好，因为它的javadoc非常清楚这个 OutputStream 必须才能关闭。

Being unable to find a definitive answer I took a look at jersey's source being the reference implementation. In Jersey the StreamingOutput is processed by a MessageBodyWriter by simply calling streamingOutput.write(os) [1] where os is the OutputStream passed to the MessageBodyWriter. That's good because its javadoc is quite clear that this OutputStream must not be closed.

总结一下： OutputStream 传递给 StreamingOutput 不得关闭。

To summarize: The OutputStream passed to the StreamingOutput must not be closed.

[1] https://github.com/jersey/jersey/blob/master/core-common /src/main/java/org/glassfish/jersey/message/internal/StreamingOutputProvider.java

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