java httpurlconnection因连接重置而失败

我开始用java编写代码，并尝试将一个现有的.NET应用程序转换为一个连续的数据流。我尝试了下面的代码，但是如果连接仍然为false，并且似乎连接了，则不会检索到任何数据，然后连接重置失败

private static HttpURLConnection getConnection(String urlString, String username, String password) throws IOException {
    URL url = new URL(urlString);
    HttpURLConnection connection = (HttpURLConnection) url.openConnection();



    connection.setReadTimeout(300000);
    connection.setConnectTimeout(30000);
    connection.setRequestProperty("Authorization", createAuthHeader(username, password));
    connection.setRequestProperty("Accept-Encoding", "gzip");
    connection.setRequestProperty("Content-Type","application/json");
    connection.setRequestProperty("Connection","Keep-Alive");
    connection.setRequestProperty("useragent", "Mozilla/5.0 (Windows; U; Windows 
           NT 6.0; en-US; rv:1.9.0.10) Gecko/2009042316 Firefox/3.0.10 (.NET CLR 3.5.30729)");


    return connection;
    }
    ...

    public Producer(Properties cprops, String kafkaBroker, String kafkaTopic) {
....
    try {

        String charset = "UTF-8";
        String username = "me.com";
        String password = "password";
        String url = "https:/something.com.json";
        HttpURLConnection connection = null;
        InputStream inputStream = null;


        try {

            connection = getConnection(url, username, password);
            connection.connect();
            inputStream = connection.getInputStream();
            int responseCode = connection.getResponseCode();
            int numbytesRead = 0;

            if (responseCode >= 200 && responseCode <= 299) {
            BufferedReader reader = 
                                   new BufferedReader(new InputStreamReader
                                  (new StreamingGZIPInputStream(inputStream), charset));
                String line = reader.readLine();
                while(true){
                //read message per line and send to kafka
                numbytesRead = line.length();
                if (numbytesRead != 0) {   
                                    producer.send(new 
                                        KeyedMessage<String, String>(kafkaTopic,null,line));
                System.out.println(line);
                }else {
                  line = reader.readLine();
                  continue;
                }

编辑：添加了附加代码

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感谢您的任何帮助

您无需设置方法或连接请求属性。在调用connection.getInputStream或getStatusCode或类似方法对连接进行实际操作之前，连接本身不会真正发生。您的代码看起来不错。您请求的url是什么？它接受get吗？您应该显示更多代码。调用getConnection后，代码中会发生什么？顺便说一句，您必须删除header方法，有一种方法可用于此目的。标题ContentType应为ContentType。如果你不再想与野兽HTTPURLConnect战斗，你应该考虑使用其中列出的一个库。我插入了第二次尝试连接-Connect。Connect。HttpURLConnection有问题吗？我将对属性和标题进行更正。哦，等等；它确实起作用了。不确定这是否只是标题属性中的微小更改，但我可以看到数据。也许我连接到的流当时没有推送数据。谢谢大家。