java.net.ConnectException:与Google地图的连接被拒绝

我遇到了技术问题，在Java程序中连接到googleapis时出现了连接拒绝错误

String url = https://maps.googleapis.com/maps/api/geocode/json?address=Ctra.+Ibiza+a+San+Antonio%2C+Km+5%2C+07816+San+Rafael%2C+Illes+Balears%2C+Spain&key=AIzaSyAawKhhK1ieNloq0wogoSTXb-eEwpb-pol

URL url = new URL(url);
URLConnection uc = url.openConnection ();
uc.connect();

错误：

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:339)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:579)
    at sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:618)
    at sun.security.ssl.BaseSSLSocketImpl.connect(BaseSSLSocketImpl.java:160)
    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.protocol.https.HttpsClient.<init>(HttpsClient.java:275)
    at sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:371)
    at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:191)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:932)
    at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:177)
    at sun.net.www.protocol.https.HttpsURLConnectionImpl.connect(HttpsURLConnectionImpl.java:153)

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把URL放在浏览器中，它工作得非常好

不要使用URLConnection，请尝试使用HttpURLConnection，同时添加以下请求属性

HttpURLConnection urlConnection = (HttpURLConnection) postURL.openConnection();
urlConnection.addRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.86 Safari/537.36");

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除了使用URLConnection，还可以尝试使用HttpURLConnection，添加以下请求属性

HttpURLConnection urlConnection = (HttpURLConnection) postURL.openConnection();
urlConnection.addRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.86 Safari/537.36");