差異處
這裏顯示兩個版本的差異處。
Both sides previous revision 前次修改 下次修改 | 前次修改 | ||
java:basic:httpurlconnection:readblockingissue [2018/03/21 22:41] tony [Problem] |
java:basic:httpurlconnection:readblockingissue [2023/06/25 09:48] (目前版本) |
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行 10: | 行 10: | ||
conn.setReadTimeout(readTimeout); | conn.setReadTimeout(readTimeout); | ||
</code> | </code> | ||
- | 為什麼跑了好幾天的heap中,還會有連線資訊呢? | + | 為什麼service已經執行好幾天了,還會存在理應timeout的連線呢? |
===== How to resolve? ===== | ===== How to resolve? ===== | ||
+ | 從call stack中去查看java原始碼可以發現,在sun.net.www.protocol.https.HttpsClient.afterConnect中,會使用SSLSocketFactory去建立socket並且做handshake,期間並沒有設定readTimeout;如果http server並沒吐訊息或自動中斷連線,就有可能造成client程式block住。在這種情況下,即使你做中斷也沒用。\\ | ||
+ | 目前我們解決的方式是透過一個wrapper SSLSocketFactory,去設定default timeout: | ||
+ | <code java> | ||
+ | private Socket setDefaultProp(Socket socket) throws SocketException{ | ||
+ | socket.setSoTimeout(readTimeout); | ||
+ | return socket; | ||
+ | } | ||
+ | |||
+ | @Override | ||
+ | public Socket createSocket(Socket aS, String aHost, int aPort, boolean aAutoClose) throws IOException { | ||
+ | return setDefaultProp(mSocketFactory.createSocket(aS, aHost, aPort, aAutoClose)); | ||
+ | } | ||
+ | </code> | ||
+ | 而HttpsURLConnection會設定我們自己的SSLSocketFactory: | ||
+ | <code java> | ||
+ | HttpsURLConnection sslconn = (HttpsURLConnection) conn; | ||
+ | sslconn.setSSLSocketFactory(mySSLSocketFactory); | ||
+ | </code> | ||
===== ===== | ===== ===== | ||
---- | ---- | ||
\\ | \\ | ||
~~DISQUS~~ | ~~DISQUS~~ |