检查 Internet 连接是否可以通过代理获得

Question

我正在尝试检查 android 设备上的互联网连接是否可用，但我的互联网连接需要代理才能访问互联网。

这是我的代码：

URL myurl = new URL("http://www.google.com");
HttpURLConnection connection;
InetSocketAddress proxyInet = new InetSocketAddress(session.getUrlProxy(),session.getPortProxy());
Proxy proxy = new Proxy(Proxy.Type.HTTP, proxyInet);
connection = (HttpURLConnection)myurl.openConnection(proxy);
connection.setConnectTimeout(2000);
connection.setReadTimeout(2000);
int responseCode = -1;
responseCode = connection.getResponseCode();
                if (responseCode == HttpURLConnection.HTTP_OK) {
                      connected= true;
                      connection.disconnect();
                }
                else {
                    connection.disconnect();
                }

此代码返回此异常消息：

java.net.SocketException: recvfrom failed: ECONNRESET (Connection reset by peer)
04-28 09:33:38.115 25512-25672/com.asde.minimental W/System.err:     at libcore.io.IoBridge.maybeThrowAfterRecvfrom(IoBridge.java:545)
04-28 09:33:38.119 25512-25672/com.asde.minimental W/System.err:     at libcore.io.IoBridge.recvfrom(IoBridge.java:509)
04-28 09:33:38.122 25512-25672/com.asde.minimental W/System.err:     at java.net.PlainSocketImpl.read(PlainSocketImpl.java:488)
04-28 09:33:38.122 25512-25672/com.asde.minimental W/System.err:     at java.net.PlainSocketImpl.access$000(PlainSocketImpl.java:46)
04-28 09:33:38.125 25512-25672/com.asde.minimental W/System.err:     at java.net.PlainSocketImpl$PlainSocketInputStream.read(PlainSocketImpl.java:240)
04-28 09:33:38.129 25512-25672/com.asde.minimental W/System.err:     at java.io.InputStream.read(InputStream.java:163)
04-28 09:33:38.135 25512-25672/com.asde.minimental W/System.err:     at java.io.BufferedInputStream.fillbuf(BufferedInputStream.java:142)
04-28 09:33:38.139 25512-25672/com.asde.minimental W/System.err:     at java.io.BufferedInputStream.read(BufferedInputStream.java:227)
04-28 09:33:38.142 25512-25672/com.asde.minimental W/System.err:     at libcore.io.Streams.readAsciiLine(Streams.java:201)
04-28 09:33:38.145 25512-25672/com.asde.minimental W/System.err:     at libcore.net.http.HttpEngine.readResponseHeaders(HttpEngine.java:560)
04-28 09:33:38.149 25512-25672/com.asde.minimental W/System.err:     at libcore.net.http.HttpEngine.readResponse(HttpEngine.java:813)
04-28 09:33:38.149 25512-25672/com.asde.minimental W/System.err:     at libcore.net.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:274)
04-28 09:33:38.149 25512-25672/com.asde.minimental W/System.err:     at libcore.net.http.HttpURLConnectionImpl.getResponseCode(HttpURLConnectionImpl.java:486)
04-28 09:33:38.152 25512-25672/com.asde.minimental W/System.err:     at com.asde.minimental.utilities.Utils.isInternetConn(Utils.java:283)
04-28 09:33:38.152 25512-25672/com.asde.minimental W/System.err:     at com.asde.minimental.net.AsyncUpdater.doInBackground(AsyncUpdater.java:58)
04-28 09:33:38.155 25512-25672/com.asde.minimental W/System.err:     at com.asde.minimental.net.AsyncUpdater.doInBackground(AsyncUpdater.java:30)
04-28 09:33:38.155 25512-25672/com.asde.minimental W/System.err:     at android.os.AsyncTask$2.call(AsyncTask.java:287)
04-28 09:33:38.159 25512-25672/com.asde.minimental W/System.err:     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
04-28 09:33:38.162 25512-25672/com.asde.minimental W/System.err:     at java.util.concurrent.FutureTask.run(FutureTask.java:137)
04-28 09:33:38.165 25512-25672/com.asde.minimental W/System.err:     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
04-28 09:33:38.165 25512-25672/com.asde.minimental W/System.err:     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
04-28 09:33:38.169 25512-25672/com.asde.minimental W/System.err:     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
04-28 09:33:38.175 25512-25672/com.asde.minimental W/System.err:     at java.lang.Thread.run(Thread.java:856)
04-28 09:33:38.179 25512-25672/com.asde.minimental W/System.err: Caused by: libcore.io.ErrnoException: recvfrom failed: ECONNRESET (Connection reset by peer)
04-28 09:33:38.182 25512-25672/com.asde.minimental W/System.err:     at libcore.io.Posix.recvfromBytes(Native Method)
04-28 09:33:38.185 25512-25672/com.asde.minimental W/System.err:     at libcore.io.Posix.recvfrom(Posix.java:132)
04-28 09:33:38.185 25512-25672/com.asde.minimental W/System.err:     at libcore.io.BlockGuardOs.recvfrom(BlockGuardOs.java:164)
04-28 09:33:38.185 25512-25672/com.asde.minimental W/System.err:     at libcore.io.IoBridge.recvfrom(IoBridge.java:506)
04-28 09:33:38.185 25512-25672/com.asde.minimental W/System.err:    ... 21 more

这段没有代理的代码运行良好

connection = (HttpURLConnection)myurl.openConnection();

会有什么问题？

谢谢

EDIT1：如果我尝试使用https://stackoverflow.com/，它可以正常工作。问题似乎出在到达请求的谷歌服务器上

Answer 1

如果不放这个权限，写在AndroidManifest.xml的最上面

<uses-permission android:name="android.permission.INTERNET" />

之后（或者如果已经放置），请在连接之前为您的 HttpURLConnection 设置此属性

connection.setRequestProperty("connection", "close");