PC和Android设备之间的客户端 - 服务器连接问题
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我正在尝试将我的android设备连接到服务器，该服务器停留在我的PC上
这里试图创建一个套接字，但这个示例总是抛出异常
public void ref(View view) throws Exception
{
Socket s=new Socket("178.67.235.32",9876);
try
{
BufferedReader in=new BufferedReader(new InputStreamReader(s.getInputStream()));
PrintWriter out=new PrintWriter(new OutputStreamWriter(s.getOutputStream()));
out.print("123");
String str=in.readLine();
}
catch (Exception e)
{
Log.e("GG",e.toString());
}
finally
{
s.close();
}
这是我正在运行的服务器
public class Server
{
public static final ArrayList<InetAddress> users = new ArrayList<InetAddress>();
static final int PORT = 9876;
public static void main(String[] args) throws IOException
{
int i = 0;
ServerSocket s = new ServerSocket(PORT);
System.out.println("ServerStart");
try
{
while (true)
{
Socket socket = s.accept();
users.add(socket.getInetAddress());
try
{
System.out.println("yea");
new OneUserThread(socket, i);
i++;
} catch (Exception e)
{
System.out.println(e);
}
}
} catch (Exception e)
{
System.out.println(e);
} finally
{
s.close();
}
}
}
结果，我期待显示有关连接的消息，但我在logcat中有例外
我的logcat：32行-it正在创建Socket
12-03 14:37:58.574 5574-5574/ru.scapegoats.checkers E/AndroidRuntime: FATAL EXCEPTION: main
Process: ru.scapegoats.checkers, PID: 5574
java.lang.IllegalStateException: Could not execute method for android:onClick
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:293)
at android.view.View.performClick(View.java:4463)
at android.view.View$PerformClick.run(View.java:18770)
at android.os.Handler.handleCallback(Handler.java:808)
at android.os.Handler.dispatchMessage(Handler.java:103)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5333)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:829)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:645)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:4463)
at android.view.View$PerformClick.run(View.java:18770)
at android.os.Handler.handleCallback(Handler.java:808)
at android.os.Handler.dispatchMessage(Handler.java:103)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5333)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:829)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:645)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.os.NetworkOnMainThreadException
at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1156)
at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84)
at libcore.io.IoBridge.connectErrno(IoBridge.java:159)
at libcore.io.IoBridge.connect(IoBridge.java:112)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.Socket.startupSocket(Socket.java:579)
at java.net.Socket.tryAllAddresses(Socket.java:131)
at java.net.Socket.<init>(Socket.java:181)
at java.net.Socket.<init>(Socket.java:153)
at ru.scapegoats.checkers.InternetMenu.ref(InternetMenu.java:32)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:4463)
at android.view.View$PerformClick.run(View.java:18770)
at android.os.Handler.handleCallback(Handler.java:808)
at android.os.Handler.dispatchMessage(Handler.java:103)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5333)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:829)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:645)
at dalvik.system.NativeStart.main(Native Method)
12-03 14:38:00.252 950-1170/? E/InputDispatcher: channel '42c4e900 ru.scapegoats.checkers/ru.scapegoats.checkers.InternetMenu (server)' ~ Channel is unrecoverably broken and will be disposed!
答案
您可以在日志中看到您的例外是NetworkOnMainThreadException。这意味着您正在尝试在主线程中打开套接字。您需要将客户更改为：
public void ref(View view) throws Exception {
HandlerThread handlerThread = new HandlerThread("threadName");
handlerThread.start();
Handler mainHandler = new Handler(handlerThread.getLooper());
Runnable myRunnable = new Runnable() {
@Override
public void run() {
Socket s = new Socket("178.67.235.32", 9876);
try {
BufferedReader in = new BufferedReader(new InputStreamReader(s.getInputStream()));
PrintWriter out = new PrintWriter(new OutputStreamWriter(s.getOutputStream()));
out.print("123");
String str = in.readLine();
} catch (Exception e) {
Log.e("GG", e.toString());
} finally {
s.close();
}
}
};
mainHandler.post(myRunnable);
}
此外，请确保您在清单中拥有权限：
<uses-permission android:name="android.permission.INTERNET"/>
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