PC和Android设备之间的客户端 - 服务器连接问题

人生难得几回搏，此时不搏待何时。这篇文章主要讲述PC和Android设备之间的客户端 - 服务器连接问题相关的知识，希望能为你提供帮助。
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(); } } }

【PC和Android设备之间的客户端 - 服务器连接问题】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：