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[英]FileNotFoundException while getting the InputStream object from HttpURLConnection
[英]Connection refused while getting inputstream from google
我正在編寫一種將GET請求發送到端點並將響應文本解析為json的方法。
public static KafkaConnection getKafkaConnection(String sUrl) throws IOException {
URL url=new URL(sUrl);
HttpURLConnection con=(HttpURLConnection)url.openConnection();
con.setRequestMethod("GET");
InputStream is = con.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder builder = new StringBuilder();
for (String line = null; (line = reader.readLine()) != null;) {
builder.append(line).append("\n");
}
String jsonText = builder.toString();
JSONObject json = new JSONObject(jsonText);
KafkaConnection kc = new KafkaConnection();
JSONArray array = json.getJSONArray("address");
List<String> list = new ArrayList<String>();
for (int i = 0; i < array.length(); i++) {
list.add(array.getString(i));
}
kc.setAddresses(list);
kc.setZookeeper(json.getString("zookeeper"));
return kc;
}
但是我在InputStream is = con.getInputStream();
行收到“連接被拒絕”錯誤InputStream is = con.getInputStream();
。 對於任何網址。 甚至http://www.google.com
。 這些URL可以從瀏覽器訪問,也可以在同一台計算機上使用curl
命令訪問。 是什么導致使用HttpUrlConnection的連接失敗?
下面是堆棧跟蹤:
Exception in thread "main" java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at java.net.Socket.connect(Socket.java:538)
at sun.net.NetworkClient.doConnect(NetworkClient.java:180)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:432)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:527)
at sun.net.www.http.HttpClient.<init>(HttpClient.java:211)
at sun.net.www.http.HttpClient.New(HttpClient.java:308)
at sun.net.www.http.HttpClient.New(HttpClient.java:326)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1202)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1138)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1032)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:966)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1546)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1474)
at com.lgc.dist.plat.test.kafka.KafkaTestUtils.getKafkaConnection(KafkaTestUtils.java:30)
at com.lgc.dist.plat.test.kafka.KafkaTestUtils.main(KafkaTestUtils.java:54)
編輯根據答案,似乎共識是這是防火牆問題。
我確實為我的計算機https:// user:pass@np1prxy801.corp.company.com:80將環境變量http_proxy
和https_proxy
設置為以下內容
因此,我在連接之前添加了以下代碼:
System.setProperty("http.proxyHost", "https://np1prxy801.corp.company.com");
System.setProperty("http.proxyPort", "80");
String user = "user";
String password = "pass";
Authenticator.setDefault(
new Authenticator() {
@Override
public PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(
user, password.toCharArray());
}
}
);
但是,我仍然收到connection refused
錯誤。
嘗試連接之前,請嘗試
System.setProperty(“ http.proxyHost”,“ your.proxy.server.com”); System.setProperty(“ http.proxyPort”,“ {您的代理端口}”);
作為實驗
最后,基於其他兩個帖子,它可以與以下代碼一起使用, Eclipse出站連接被阻止:從Web瀏覽器 可以使用 相同的url,以及如何使HttpURLConnection使用代理?
Proxy proxy = new Proxy(Proxy.Type.HTTP,
new InetSocketAddress("np1prxy801.corp.abc.com", 80));
URL url=new URL(sUrl);
HttpURLConnection con = (HttpURLConnection)url.openConnection(proxy);
String user = "user";
String password = "password";
Authenticator.setDefault(
new Authenticator() {
@Override
public PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(
user, password.toCharArray());
}
}
);
con.setRequestMethod("GET");
InputStream is = con.getInputStream();
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