301永久移动 [英] 301 Moved Permanently

问题描述

我正在尝试通过Java中的URL获取HTML。但 301永久移动就是我所拥有的一切。另一个URL工作。怎么了？这是我的代码：

I'm trying to get HTML by URL in Java. But 301 Moved Permanently is all that I've got. Another URLs work. What's wrong? This is my code:

 hh= new URL("http://hh.ru");
        in = new BufferedReader(
                new InputStreamReader(hh.openStream()));


        while ((inputLine = in.readLine()) != null) {

            sb.append(inputLine).append("\n");
            str=sb.toString();//returns 301


        }

推荐答案

您正面临重定向到其他网址的问题。这很正常，网站可能有很多理由重定向您。只需遵循基于位置HTTP标头的重定向：

You're facing a redirect to other URL. It's quite normal and web site may have many reasons to redirect you. Just follow the redirect based on "Location" HTTP header like that:

URL hh= new URL("http://hh.ru");
URLConnection connection = hh.openConnection();
String redirect = connection.getHeaderField("Location");
if (redirect != null){
    connection = new URL(redirect).openConnection();
}
BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
String inputLine;
System.out.println();
while ((inputLine = in.readLine()) != null) {
    System.out.println(inputLine);
}

您的浏览器正在自动跟踪重定向，但使用URLConnection，您应该通过拥有。如果您感到困扰，请查看其他 Java HTTP客户端实施，例如Apache HTTP Client。他们中的大多数都能够自动关注重定向。

Your browser is following redirects automaticaly, but using URLConnection you should do it by your own. If it bothers you take a look at other Java HTTP client implementations, like Apache HTTP Client. Most of them are able to follow redirect automatically.

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