java套接字超时行为 [英] java socket timeout behaviour

问题描述

如果我在 Java 套接字上设置 soTimeout，那么在主动对等方与被动对等方的情况下会发生什么行为.例如，如果我有一个 1 分钟的 readtimeout 值并且有一个文件传输并且需要 5 分钟，它是否会出现 readtimeout 异常?对我来说，有必要在连接挂起时获得超时异常.

If I set soTimeout on java sockets what will be the behaviour in case of active peer vs passive peer. For instance if I have a readtimeout value 1 minute and having a file transfer and which takes 5 minutes will it get readtimeout exception or not ? For me its necessary to get timeout exception when connection hangs.

推荐答案

soTimeout 设置显式影响从套接字输入流读取的操作.您可以将其视为允许调用者在读取操作上定义定时块.来自 setSoTimeout 的 Javadoc:

The soTimeout setting explicitly affects operations that read from the socket's input stream. You can think of it as allowing the caller to define a timed block on read operations. From the Javadoc for setSoTimeout:

使用指定的超时时间(以毫秒为单位)启用/禁用 SO_TIMEOUT.将此选项设置为非零超时后，对与此 Socket 关联的 InputStream 将仅为此阻塞时间.如果超时到期，则java.net.SocketTimeoutException 被引发，尽管 Socket 仍然是有效.

Enable/disable SO_TIMEOUT with the specified timeout, in milliseconds. With this option set to a non-zero timeout, a read() call on the InputStream associated with this Socket will block for only this amount of time. If the timeout expires, a java.net.SocketTimeoutException is raised, though the Socket is still valid.

在被动对等体的情况下，不会仅仅因为对等体没有调用read而引发超时.但是，如果它确实进行了读取调用，则该调用必须在 soTimeout 到期之前返回数据，否则将引发 SocketTimeoutException.

In the case of a passive peer, no timeout will be thrown solely due to the peer not calling read. However, if and when it does make a read call, the call must return data before the soTimeout expires, or else a SocketTimeoutException will be raised.

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