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如何使 Java Socket 的读取超时？

发布于 2024-09-16 04:37:14 字数 95 浏览 11 评论 0原文

我正在尝试从套接字读取项目，我注意到如果套接字流上没有任何内容，它将停留在读取状态并备份我的应用程序。我想知道是否有办法设置读取超时或在套接字中没有任何内容一定时间后终止连接。

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心头的小情儿 2024-09-23 04:37:14

如果您编写 Java，请学习浏览API 文档有帮助。在套接字读取的情况下，您可以设置超时选项，例如：

socket.setSoTimeout(500);

这将导致与套接字关联的 InputStream 在 read() 之后抛出 SocketTimeoutException code> 调用阻塞半秒。需要注意的是，SocketTimeoutException 在此类 read() 调用引发的异常中是唯一的，因为套接字仍然有效；您可以继续使用它。异常只是一种逃避读取并决定是否需要做不同事情的机制。

while (true) {
    int n;
    try {
        n = input.read(buffer);
    catch (SocketTimeoutException ex) {
        /* Test if this action has been cancelled */
        if (Thread.interrupted()) throw new InterruptedIOException();
    }
    /* Handle input... */
}

If you write Java, learning to navigate the API documentation is helpful. In the case of a socket read, you can set the timeout option, e.g.:

socket.setSoTimeout(500);

This will cause the InputStream associated with the socket to throw a SocketTimeoutException after a read() call blocks for one-half second. It's important to note that SocketTimeoutException is unique among exceptions thrown by such read() calls, because the socket is still valid; you can continue to use it. The exception is only a mechanism to escape from the read and decide if it's time to do something different.

while (true) {
    int n;
    try {
        n = input.read(buffer);
    catch (SocketTimeoutException ex) {
        /* Test if this action has been cancelled */
        if (Thread.interrupted()) throw new InterruptedIOException();
    }
    /* Handle input... */
}

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窝囊感情。 2024-09-23 04:37:14

如果此套接字是通过 URLConnection 创建的以执行 Web 请求，则可以在读取流之前直接在 URLConnection 上设置读取和连接超时：

InputStream createInputStreamForUriString(String uriString) throws IOException, URISyntaxException {
    URLConnection in = new URL(uriString).openConnection();
    in.setConnectTimeout(5000);
    in.setReadTimeout(5000);
    in.setAllowUserInteraction(false);
    in.setDoInput(true);
    in.setDoOutput(false);
    return in.getInputStream();
}

If this socket was created through a URLConnection to perform a web request, you can set the read and connect timeouts directly on the URLConnection before reading the stream:

InputStream createInputStreamForUriString(String uriString) throws IOException, URISyntaxException {
    URLConnection in = new URL(uriString).openConnection();
    in.setConnectTimeout(5000);
    in.setReadTimeout(5000);
    in.setAllowUserInteraction(false);
    in.setDoInput(true);
    in.setDoOutput(false);
    return in.getInputStream();
}

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