(Java/Android) 客户端 Socket 抛出 IOException答案

【问题标题】：(Java/Android) Client-side Socket throwing IOException(Java/Android) 客户端 Socket 抛出 IOException
【发布时间】：2014-11-08 02:20:03
【问题描述】：

我正在尝试通过套接字连接 2 台 Android 设备，但为什么无法正常工作？我尝试用 IP 地址替换主机地址，但没有成功。

服务器端（扩展 AsyncTask）：

ServerSocket server;
int port;
String hostName

server = new ServerSocket(0);
port = server.getLocalPort(); //is sent to client via OR code

for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {
    NetworkInterface intf = en.nextElement();
    for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements();) {
        InetAddress inetAddress = enumIpAddr.nextElement();
        if (!inetAddress.isLoopbackAddress()) {
            hostName = inetAddress.getHostName(); //is sent to client via OR code
        }
    }
}

Socket client = server.accept();

客户端（扩展 AsyncTask）：

SocketAddress socketAddress = new InetSocketAddress(serverHostName, serverPort);
client = new Socket();
client.bind(null);
client.connect(socketAddress, SOCKET_TIMEOUT); //exception happens in this method
connected = true;

这是堆栈跟踪：

11-08 03:02:38.050: W/System.err(26424): java.net.SocketTimeoutException: failed to connect to /fe80::b652:7dff:feb5:ece2%wlan0%7 (port 54579) after 10000ms
11-08 03:02:38.090: W/System.err(26424):    at libcore.io.IoBridge.connectErrno(IoBridge.java:150)
11-08 03:02:38.090: W/System.err(26424):    at libcore.io.IoBridge.connect(IoBridge.java:112)
11-08 03:02:38.120: W/System.err(26424):    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
11-08 03:02:38.160: W/System.err(26424):    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
11-08 03:02:38.210: W/System.err(26424):    at java.net.Socket.connect(Socket.java:848)
11-08 03:02:38.210: W/System.err(26424):    at com.example.virtualcard.QRInternetClientThread.doInBackground(QRInternetClientThread.java:55)
11-08 03:02:38.220: W/System.err(26424):    at android.os.AsyncTask$2.call(AsyncTask.java:264)
11-08 03:02:38.220: W/System.err(26424):    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
11-08 03:02:38.220: W/System.err(26424):    at java.util.concurrent.FutureTask.run(FutureTask.java:137)
11-08 03:02:38.230: W/System.err(26424):    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
11-08 03:02:38.230: W/System.err(26424):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
11-08 03:02:38.230: W/System.err(26424):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
11-08 03:02:38.230: W/System.err(26424):    at java.lang.Thread.run(Thread.java:856)

【问题讨论】：

你确定两台安卓设备在同一个网络上吗？
我已经解决了这个问题。原来我应该在创建套接字之前使用我将在客户端的答案中发布的代码，并且我必须更改它以使用 IP 地址而不是主机名。

标签： java android sockets android-asynctask serversocket

【解决方案1】：

我已经解决了我的问题。原来我应该在创建套接字之前在客户端上使用此代码，并且我必须更改它以使用 IP 地址而不是主机名。

InetAddress addr = InetAddress.getByName(serverIP);
SocketAddress socketAddress = new InetSocketAddress(addr, serverPort);

//here follows the old client code
SocketAddress socketAddress = new InetSocketAddress(serverHostName, serverPort);
client = new Socket();
client.bind(null);
client.connect(socketAddress, SOCKET_TIMEOUT); //exception happens in this method
connected = true;

【讨论】：