如何获取java.net.HttpURLConnection使用的源端口？

Question

I am using the java.net.HttpURlConnection or javax.net.ssl.HttpsURLConnection objects for connecting to http/https servers. My tests failed at some point because apparently all they had used up all the available ports on my local machine. These are persistent http connections and therefore should be reused.

I am trying a few things to fix this. But to check whether my fix works, I need to make sure that the same port on the source machine is getting used in subsequent instances of HttpURlConnection or HttpsURLConnection . How can I get the source port being used by java.net.HttpURLConnection ?

Answer 1

Either you specify the port as a part of URL you supply to your HTTP connection or defaultone is used.

Either way, your URL object has this information and you can inquire about it with its getPort() method.

Answer 2

I don't see any methods that allows same local port bind in HttpURlConnection or get local port number being used for binding. There is some methods in Java's Socket class that allows you to bind same local port ( constructor method and bind() I think ) though... Check PlainConnectionSocketFactory in Apache httpclient 4.x than Socket if you want to go this way since those HttpClient has more handy methods.