Java HttpURLConnection不连接时，我调用connect（） [英] Java HttpURLConnection doesn't connect when I call connect()

问题描述

我想写一个程序，在我的webapp上进行自动测试。为了实现这一点，我使用HttpURLConnection打开一个连接。

我想要测试的其中一个网页执行302重新导向。我的测试代码看起来像这样：

  URL currentUrl = new URL（urlToSend）; 
 HttpURLConnection connection =（HttpURLConnection）currentUrl.openConnection（）; 
 connection.connect（）; 
 system.out.println（connection.getURL（）。toString（））; 
  

因此，假设urlToSend http://www.foo.com/bar.jsp ，并且此网页会将您重定向到 http://www.foo.com/quux.jsp 。我的println语句应该打印出 http://www.foo.com/quux.jsp ，

重定向不会发生，它打印出原始的URL。但是，如果我改变开关connect.connect（）线调用connection.getResponseCode（），它奇迹般工作。

  URL currentUrl = new URL（urlToSend）; 
 HttpURLConnection connection =（HttpURLConnection）currentUrl.openConnection（）; 
 //connection.connect（）; 
 connection.getResponseCode（）; 
 system.out.println（connection.getURL（）。toString（））; 
  

为什么会出现这种情况？我会做错什么？

感谢您的帮助。

解决方案

connect（）方法只是创建一个连接。您必须提交请求（通过调用 getInputStream（）， getResponseCode（）或 getResponseMessage（）），以便返回和处理响应。

I'm trying to write a program to do automated testing on my webapp. To accomplish this, I open up a connection using HttpURLConnection.

One of the pages that I'm trying to test performs a 302 redirect. My test code looks like this :

URL currentUrl = new URL(urlToSend);
HttpURLConnection connection = (HttpURLConnection) currentUrl.openConnection();
connection.connect();
system.out.println(connection.getURL().toString());

So, let's say that urlToSend is http://www.foo.com/bar.jsp, and that this page redirects you to http://www.foo.com/quux.jsp. My println statement should print out http://www.foo.com/quux.jsp, right?

WRONG.

The redirect never happens, and it prints out the original URL. However, if I change switch out the connection.connect() line with a call to connection.getResponseCode(), it magically works.

URL currentUrl = new URL(urlToSend);
HttpURLConnection connection = (HttpURLConnection) currentUrl.openConnection();
//connection.connect();
connection.getResponseCode();
system.out.println(connection.getURL().toString());

Why am I seeing this behavior? Am I doing anything wrong?

Thanks for the help.

解决方案

The connect() method just creates a connection. You have to commit the request (by calling getInputStream(), getResponseCode(), or getResponseMessage()) for the response to be returned and processed.

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