如何检查java是否存在网页？ [英] How do i check if a webpage exists with java?

问题描述

所以这是交易。我还没有，但从星期五开始，我正在建立一个论坛。我想做的是检查用户是否在论坛上注册。

So here's the deal. I don't have it yet, but starting Friday, I'm in the process of making a forum. What I'd like to do is check to see if a user is registered on the forum.

我不确定，但可以说用户存储在URL / users / NAME.WHATEVER（jsp？）

I'm not sure exactly, but lets say the users are stored in URL/users/NAME.WHATEVER (jsp?)

如何在java中建立URL连接，并检查URL / users / Robert.WHATEVER == null？

how, in java, do i make a URL connection, and check to see if URL/users/Robert.WHATEVER == null?

推荐答案

即使你可以搜索你的答案：
一种简单的方法是使用 Apache Http组件

Even you could have googled your answer: One simple way is to use the Apache Http Components

HttpClient httpclient = new DefaultHttpClient();
HttpGet httpget = new HttpGet("http://localhost/users/Robert.WHATEVER");
HttpResponse response = httpclient.execute(httpget);
if (response.getStatusLine().getStatusCode() == 404) {
   System.out.println("User Robert.WHATEVER not found");
}

有一个很好的教程，其中包含许多解释如何使用HttpClient的示例。

There is a good Tutorial with many examples which explains how to use the HttpClient.

另一个高级框架是 ResteasyClientFramework 。

Another highlevel framework is the ResteasyClientFramework.

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