Java .getInputStream() openConnection() HTTP 响应代码 ERRORS

Question

我正在尝试执行以下操作（在 Java 中）：

• 连接到一些代理服务器和一些http_url

但我遇到了一些错误，例如： java.net.ConnectException: Connection timed out: connect...

或与HTTP响应码相关的错误：302, 400, FileNotFound, file server error等

在我所做的一些更改中，我什至得到了200 代码。 （当我只使用openConnection() =>（没有代理IP地址）。 这是我最好的运行轨迹。

我在 IDE Eclipse Luna 控制台的错误消息中包含所有类别的 : (Unknown Source)。

一些错误来自/或来自：.getInputStream()方法，我不知道是否有关于setDoInput()、setDoOutput、编码或其他：

有什么身体可以帮助我吗？

这是我的代码：

url = new URL(http_url);
HttpURLConnection conn;
    try {
        conn = (HttpURLConnection)url.openConnection(proxy);
        conn.setRequestMethod("GET");
        conn.setRequestProperty("User-Agent", USERAGENT);

        conn.setUseCaches(false);
        conn.setRequestProperty("Accept", "*/*");
        conn.addRequestProperty("Referer", "http://www.google.com/");
        conn.setRequestProperty("Accept-Encoding", "gzip,deflate,sdch");
        conn.setRequestProperty("Accept-Language", "en-US,en;q=0.8");
        conn.setRequestProperty("Content-Type", "application/json; charset=UTF-8");
        conn.setRequestProperty("X-Requested-With", "XMLHttpRequest");
        conn.setDoInput(true);
        System.out.println("response msg  " + conn.getResponseMessage() + " CODE");

        System.out.println("errorStream msg " + conn.getErrorStream());
        System.out.println("inputStream msg " + conn.getInputStream());
        String header_date = conn.getHeaderField("Date");
        System.out.println(" date es: " + header_date);
        String line = null;
        StringBuffer tmp = new StringBuffer();
        System.out.println("the code is :" + conn.getResponseCode());

        if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {
            BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));

            while ((line = in.readLine()) != null) {
                tmp.append(line);
            }
            System.out.println("value line is:  " + line +"& date is: " + header_date);

            Scrape(String.valueOf(tmp)); // temp.toString()

            in.close();
            in = null;
            url = null;
            conn.disconnect();
            conn = null;
        } else {   
            System.out.println("something bad happened code <>200, debug from your server"); 
        }        
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();    
    } catch (MalformedURLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (UnsupportedEncodingException e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();
    }

Answer 1

要解决您的代理问题，您可以尝试使用Proxy，如下所示

Proxy proxy= new Proxy(Proxy.Type.HTTP, new InetSocketAddress(<Proxy IP Address as String>, <Proxy Port Number as Integer>));
        HttpURLConnection http_conn=(HttpURLConnection)request_url.openConnection(proxy);