怎么知道conection.connect()是否连接到url? [英] How do know conection.connect() is connect to url or not?

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问题描述

我创建conn = jUrl.openConnection();

当我使用conn.connect()来识别url我不知道连接是不是?

但现在我想知道我是否连接到url?



我尝试过:



i use conn.getconnectLenght()

但是每个

i create a conn of conn = jUrl.openConnection();
when i use conn.connect() to conncet url i dont know connection is or not?
but now i want to know is i connect to url or not?

What I have tried:

i use conn.getconnectLenght()
but its value is same every where

推荐答案

的值都相同你可以捕获错误引发的异常,如连接到URL(Java™教程>自定义网络>使用URL) [ ^ ]。



请参阅使用函数的文档,了解可能引发的各种行为:

URL(Java Platform SE 7):openConnection() [< a href =https://docs.oracle.com/javase/7/docs/api/java/net/URL.html#openConnection()target =_ blanktitle =New Window> ^ ]

URLConnection(Java平台) SE 7):connect() [ ^ ]
You can catch the exceptions that are thrown upon errors as described at Connecting to a URL (The Java™ Tutorials > Custom Networking > Working with URLs)[^].

See the documentation for the used functions which kinds of execptions might be thrown:
URL (Java Platform SE 7 ): openConnection() [^]
URLConnection (Java Platform SE 7 ): connect()[^]


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