java - URL.openConnection() 和 URLConnection.connect() 之间的区别？

Question

在代码中:

HttpURLConnection connection = (HttpURLConnection)createMerchURL.openConnection();
connection.setRequestMethod("PUT");
connection.addRequestProperty("Name", "Value1");

connection.connect();

..
connection.disconnect();

• 实际什么时候打开连接？在 ..createMerchURL.openConnection(); 处？或者在 connection.connect();?

• 如何在 connection 对象中设置 URL 并将其与 connection.connect() 一起使用？(因为我不太习惯 。打开连接())

最后，两者有什么区别吗？

谢谢..

Answer 1

When is the connection getting opened actually? At ..createMerchURL.openConnection(); ? or at connection.connect();?

后者。前者只是解析 URL、查找协议(protocol)并创建 HttpURLConnection 对象。

How can I set URL in the connection Object

你不能。

and use it with connection.connect()?

你不能。

(as I am less comfortable with .openConnection())

运气不好:安于现状。