何时会在JAVA的流中发生EOFException [英] When will an EOFException occur in JAVA's streams

问题描述

我正在使用DataInputStream并且有一个关于EOFExceptions的问题。

I am working with a DataInputStream and had a question about EOFExceptions.

根据java docs：

According to java docs:

表示在输入过程中意外地达到了
流的文件结尾或结尾
。

Signals that an end of file or end of stream has been reached unexpectedly during input.

此异常数据
输入流主要用于信号流的结束。
注意许多其他输入操作
在
流的末尾返回一个特殊值，而不是抛出
异常。

This exception is mainly used by data input streams to signal end of stream. Note that many other input operations return a special value on end of stream rather than throwing an exception.

这是否意味着当生成EOFException时，流不会再次打开？这是否意味着你永远不会期待它的更多数据？

Does this mean that when a EOFException is generated, the stream will not NEVER open again? Does it mean you should NEVER expect any more data from it ever?

如果输出流连接到输入流并调用outputstream.close（），输入流将接收EOFException还是IOException？

If an outputstream is connected to an inputstream and outputstream.close() is called, will an inputstream receive the EOFException or an IOException?

IOException被描述为：

An IOException is described as:

表示I / O异常发生了一些
排序。此类是
由于失败或中断的I / O
操作而产生
的一般异常类。

Signals that an I/O exception of some sort has occurred. This class is the general class of exceptions produced by failed or interrupted I/O operations.

输出流上的close是否会在datainputstream端产生EOFException或IOException？

Does a close on the outputstream produce either a EOFException or an IOException on the datainputstream side?

推荐答案

关键字是意外。

如果您使用DataInputStream并读取4字节整数但流中只剩下3个字节，您将获得EOFException。

If you use DataInputStream and read a 4 byte integer but there were only 3 bytes remaining in the stream you'll get an EOFException.

但是如果你在流的末尾调用read（），那么你只需返回-1并且没有例外。

But if you call read() at the end of stream you'll just get -1 back and no exception.

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