java - 如何使用java找出服务器响应代码

Question

我们如何通过java编码识别服务器响应代码。我的意思是，如果我们从服务器收到任何作为 HTTP 响应的响应，我们应该能够将其打印为字符串或其他任何内容。另外，我想知道我们如何在 java 中跟踪，如果某些特定请求被击到服务器并找出服务器响应代码。

Answer 1

在 Java 中，如果您想访问 http 标头代码，可以使用：

URL url = new URL("http://www.google.com");
HttpURLConnection openConnection = (HttpURLConnection) url.openConnection();
openConnection.connect();
int rCode = openConnection.getResponseCode());

Answer 2

如果您使用 URLConnection，那么此代码可以帮助您，您可以将 HTTP 响应打印为字符串。

String output = null;
output = getHttpResponseRabby("input url link");

public static String getHttpResponseRabby(String location) {

    String result = "";
    URL url = null;
    Log.d("http:", "balance information");

    try {
        url = new URL(location);
        Log.d("http:", "URL Link" + url);
    } catch (MalformedURLException e) {
        Log.e("http:", "URL Not found" + e.getMessage());
    }

    if (url != null) {
        try {
            BufferedReader in;
            HttpURLConnection urlConn = (HttpURLConnection) url.openConnection();
            urlConn.setConnectTimeout(1000);
            while(true)
            {
                try 
                    {
                     in = new BufferedReader(new InputStreamReader(urlConn.getInputStream()));
                    } 
                catch (IOException e) 
                    {
                        break;
                    }


                String inputLine;

                int lineCount = 0; // limit the lines for the example
                while ((lineCount < 5) && ((inputLine = in.readLine()) != null)) 
                    {
                        lineCount++;

                        result += inputLine;
                    }

                in.close();
                urlConn.disconnect();
                return result;
           }
        } catch (IOException e) {
            Log.e("http:", "Retrive data" + e.getMessage());
        }
    } else {
        Log.e("http:", "FAILED TO RETRIVE DATA" + " url NULL");
    }
    return result;
}

Answer 3

您可以调用HttpResponse.getStatusLine().getStatusCode()来获取状态码：http ://hc.apache.org/httpcomponents-core-ga/httpcore/apidocs/org/apache/http/HttpResponse.html

为了获取响应实体，您调用HttpResponse.getEntity()。