Question

我正在开发一个Java程序，目的是将从几个网站收集的数据集成到输出中。我从网站获得了API信息，我可以在PHP中轻松运行它们，但是当我尝试使用Java时，只有一个网站存在一个奇怪的问题。我已将代码设置为遵循重定向，但如果我尝试访问https://www.foo.com，则会将我定向到127.0.0.1。无论我使用的协议还是包括/不包括www，它都会这样做。如果我拿出重定向代码，我会得到一个通用的＆＃34;永久移动＆＃34;页面生成。

以下是我使用

的代码

public static void main(String args[]) throws IOException {

    String URLString = "http://www.sickw.com/";
    URL url = new URL(URLString);
    URLConnection connection = url.openConnection();
    System.out.println(url.toString());  //See what URL is being used
    String redirect = connection.getHeaderField("Location");
    while (redirect!=null)
    {
        System.out.println(redirect);       //Follow the redirects
        connection = new URL(redirect).openConnection();
        redirect = connection.getHeaderField("Location");
    }
    System.out.println("new " + connection.getURL().toString());    //Print the final destination

    InputStreamReader inputStreamReader = new InputStreamReader(connection.getInputStream());
    int temp = inputStreamReader.read();
    while(temp!=-1)
    {
        System.out.print((char)temp);
        temp = inputStreamReader.read();
    }
}

Answer 1

我在我的电脑中复制，粘贴和运行您的代码并获取正确的页面字符串（http://www.foo.com/）我认为你的代码没有问题。所以请检查下面的事情。

在命令行中ping测试。 ie）ping www.foo.com
检查主机文件是否包含在重定向代码中。即）127.0.0.1 www.foo.com

Answer 2

package main;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class Main {

    public static void main(String[] args) {

        try {

            String url = "https://sickw.com";

            URL obj = new URL(url);
            HttpURLConnection conn = (HttpURLConnection) obj.openConnection();
            conn.setReadTimeout(5000);
            conn.addRequestProperty("Accept-Language", "en-US,en;q=0.8");
            conn.addRequestProperty("User-Agent", "Mozilla");
            conn.addRequestProperty("Referer", "google.com");

            System.out.println("Requested URL -> " + url);

            boolean redirect = false;

            int status = conn.getResponseCode();
            if (status != HttpURLConnection.HTTP_OK) {
                if (status == HttpURLConnection.HTTP_MOVED_TEMP
                        || status == HttpURLConnection.HTTP_MOVED_PERM
                        || status == HttpURLConnection.HTTP_SEE_OTHER) {
                    redirect = true;
                }
            }

            System.out.println("Response Code -> " + status);

            if (redirect) {

                String newUrl = conn.getHeaderField("Location");

                String cookies = conn.getHeaderField("Set-Cookie");

                conn = (HttpURLConnection) new URL(newUrl).openConnection();
                conn.setRequestProperty("Cookie", cookies);
                conn.addRequestProperty("Accept-Language", "en-US,en;q=0.8");
                conn.addRequestProperty("User-Agent", "Mozilla");
                conn.addRequestProperty("Referer", "google.com");

                System.out.println("Redirect to URL -> " + newUrl);

            }

            StringBuilder html;
            try (BufferedReader in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream()))) {
                String inputLine;
                html = new StringBuilder();
                while ((inputLine = in.readLine()) != null) {
                    html.append(inputLine);
                    html.append("\n");
                }
            }

            System.out.println("URL Content -> \n" + html.toString());
            System.out.println("Completed");

        } catch (IOException e) {
        }

    }

}

这可行，但使用＆＃34; https://foo.com＆＃34;

Java HttpGet重定向到127.0.0.1

2 个答案: