Android 套接字创建失败，Telnet 连接正常
Android Socket fails to create, Telnet connection works fine
应该在我的 PC 上本地连接到服务器 运行 的代码无法运行。这是一项似乎对其他人有用的任务的一部分。我已经检查了防火墙、正确的地址和端口感知检查、端口转发等。在模拟器上安装 Telnet 应用程序证明使用 10.0.2.2 从模拟器我可以到达 Python 服务器 运行我的电脑在 127.0.0.1.
这是代码，我在其中尝试了各种方法来尝试解决潜在的 InetAddress 或 Socket 问题：
package uk.ac.man.cs.COMP28512.lab4;
import android.app.Activity;
import android.util.Log;
import android.widget.TextView;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;
/**
* Created by leeming
* Code snippets from http://examples.javacodegeeks.com/android/core/socket-core/android-socket-example/
*/
public class ServerConnect extends Thread{
public static final int BUFFER_SIZE = 2048;
private Socket socket;
private static final int SERVERPORT = 9999; //This is the port that we are connecting to
//Remember the channel simulator is 9998
private static final String SERVERIP = "10.0.2.2"; //This address is magically mapped to the host's loopback.
private static final String LOGTAG = "SocketTester";
boolean terminated = false;
private PrintWriter out = null;
private BufferedReader in = null;
Activity parentref;
/**
*
* @param parentRef Expects a reference to the calling activity, e.g. new ServerConnect(this);
*/
public ServerConnect(Activity parentRef)
{
parentref=parentRef;
}
/**
* Sends commands to the server. Called from UI thread via a button press
* @param cmd
*/
public void send(String cmd)
{
try
{
Log.i(LOGTAG,"Sending command: "+cmd);
out.println(cmd);
}
catch(Exception e)
{
Log.e(LOGTAG,"Failed to send command : "+e);
}
}
/**
* Main thread loop that grabs incoming messages
*/
public void run()
{
Log.i(LOGTAG,"Running socket thread");
try
{
// InetAddress svrAddr = InetAddress.getByName(SERVERIP);
byte[] Addr = new byte[]{10,0,2,2};
InetAddress svrAddr = InetAddress.getByAddress(Addr);
System.out.println("ADDRESS: " + svrAddr.toString());
/*
String IP = svrAddr.toString().substring(1);
InetAddress realAddr = InetAddress.getByName(IP);
System.out.println(IP);
System.out.println(realAddr.getAddress().toString());
*/
socket = new Socket(svrAddr, SERVERPORT);
// if (realAddr.isReachable(1000))
// System.out.println("Successfully reached");
//Setup i/o streams
out = new PrintWriter(new OutputStreamWriter(socket.getOutputStream()),true);
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
//Keep listening for messages from server
while(!terminated)
{
final String message = in.readLine();
if(message != null && message != "")
{
Log.i(LOGTAG,"MSG recv : "+message);
//Update GUI with any server responses
final TextView txtv = (TextView) parentref.findViewById(R.id.txtServerResponse);
parentref.runOnUiThread(new Runnable() {
@Override
public void run() {
/**
*
*
* This is where the the UI gets updated by the socket
*
*
*/
txtv.setText(message+"\n"+txtv.getText());
}
});
}
}
}
catch (UnknownHostException uhe)
{
Log.e(LOGTAG,"Unknownhost\n"+uhe.getStackTrace().toString());
}
catch (Exception e) {
Log.e(LOGTAG, "Socket failed\n"+e.getMessage());
e.printStackTrace();
}
disconnect();
Log.i(LOGTAG,"Thread now closing");
}
/**
* Disconnect from the server as well as closing i/o streams
*/
public void disconnect()
{
Log.i(LOGTAG, "Disconnecting from server");
try
{
in.close();
out.close();
}
catch(Exception e)
{/*do nothing*/}
try
{
socket.close();
}
catch(Exception e)
{/*do nothing*/}
}
}
这是我得到的日志输出：
03-30 21:08:39.846 1115-1115/uk.ac.man.cs.COMP28512.lab4 I/MainPAge﹕ onCreate entered
03-30 21:08:39.852 1115-1115/uk.ac.man.cs.COMP28512.lab4 I/SocketTester﹕ Running socket thread
03-30 21:08:39.861 1115-1115/uk.ac.man.cs.COMP28512.lab4 I/System.out﹕ ADDRESS: /10.0.2.2
03-30 21:08:39.867 1115-1115/uk.ac.man.cs.COMP28512.lab4 E/SocketTester﹕ Socket failed
null
03-30 21:08:39.868 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ android.os.NetworkOnMainThreadException
03-30 21:08:39.898 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1147)
03-30 21:08:39.898 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:110)
03-30 21:08:39.898 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at libcore.io.IoBridge.connectErrno(IoBridge.java:137)
03-30 21:08:39.898 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at libcore.io.IoBridge.connect(IoBridge.java:122)
03-30 21:08:39.899 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:183)
03-30 21:08:39.899 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:163)
03-30 21:08:39.899 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at java.net.Socket.startupSocket(Socket.java:590)
03-30 21:08:39.899 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at java.net.Socket.<init>(Socket.java:226)
03-30 21:08:39.912 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at uk.ac.man.cs.COMP28512.lab4.ServerConnect.run(ServerConnect.java:85)
03-30 21:08:39.913 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at uk.ac.man.cs.COMP28512.lab4.MainActivity.onCreate(MainActivity.java:33)
03-30 21:08:39.913 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at android.app.Activity.performCreate(Activity.java:5933)
03-30 21:08:39.913 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
03-30 21:08:39.913 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
03-30 21:08:39.913 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
03-30 21:08:39.913 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at android.app.ActivityThread.access0(ActivityThread.java:144)
03-30 21:08:39.913 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
03-30 21:08:39.914 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at android.os.Handler.dispatchMessage(Handler.java:102)
03-30 21:08:39.914 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at android.os.Looper.loop(Looper.java:135)
03-30 21:08:39.914 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at android.app.ActivityThread.main(ActivityThread.java:5221)
03-30 21:08:39.914 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at java.lang.reflect.Method.invoke(Native Method)
03-30 21:08:39.914 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at java.lang.reflect.Method.invoke(Method.java:372)
03-30 21:08:39.914 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
03-30 21:08:39.914 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
03-30 21:08:39.915 1115-1115/uk.ac.man.cs.COMP28512.lab4 I/SocketTester﹕ Disconnecting from server
03-30 21:08:39.918 1115-1115/uk.ac.man.cs.COMP28512.lab4 I/SocketTester﹕ Thread now closing
03-30 21:08:39.982 1115-1132/uk.ac.man.cs.COMP28512.lab4 D/OpenGLRenderer﹕ Render dirty regions requested: true
03-30 21:08:40.002 1115-1115/uk.ac.man.cs.COMP28512.lab4 D/﹕ HostConnection::get() New Host Connection established 0xaeef7a20, tid 1115
03-30 21:08:40.086 1115-1115/uk.ac.man.cs.COMP28512.lab4 D/Atlas﹕ Validating map...
03-30 21:08:40.437 1115-1132/uk.ac.man.cs.COMP28512.lab4 D/﹕ HostConnection::get() New Host Connection established 0xaeef74a0, tid 1132
03-30 21:08:40.508 1115-1132/uk.ac.man.cs.COMP28512.lab4 I/OpenGLRenderer﹕ Initialized EGL, version 1.4
03-30 21:08:40.605 1115-1132/uk.ac.man.cs.COMP28512.lab4 D/OpenGLRenderer﹕ Enabling debug mode 0
03-30 21:08:40.677 1115-1132/uk.ac.man.cs.COMP28512.lab4 W/EGL_emulation﹕ eglSurfaceAttrib not implemented
03-30 21:08:40.678 1115-1132/uk.ac.man.cs.COMP28512.lab4 W/OpenGLRenderer﹕ Failed to set EGL_SWAP_BEHAVIOR on surface 0xa7a3b2e0, error=EGL_SUCCESS
03-30 21:08:40.812 1115-1115/uk.ac.man.cs.COMP28512.lab4 I/Choreographer﹕ Skipped 39 frames! The application may be doing too much work on its main thread.
03-30 21:08:41.773 1115-1115/uk.ac.man.cs.COMP28512.lab4 I/Choreographer﹕ Skipped 57 frames! The application may be doing too much work on its main thread.
查看错误并跟踪错误，我无法理解可能导致无法创建套接字的原因。
见What's the difference between Thread start() and Runnable run()
看起来您是在直接调用 运行() 而不是通过 start()。
应该在我的 PC 上本地连接到服务器 运行 的代码无法运行。这是一项似乎对其他人有用的任务的一部分。我已经检查了防火墙、正确的地址和端口感知检查、端口转发等。在模拟器上安装 Telnet 应用程序证明使用 10.0.2.2 从模拟器我可以到达 Python 服务器 运行我的电脑在 127.0.0.1.
这是代码，我在其中尝试了各种方法来尝试解决潜在的 InetAddress 或 Socket 问题：
package uk.ac.man.cs.COMP28512.lab4;
import android.app.Activity;
import android.util.Log;
import android.widget.TextView;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;
/**
* Created by leeming
* Code snippets from http://examples.javacodegeeks.com/android/core/socket-core/android-socket-example/
*/
public class ServerConnect extends Thread{
public static final int BUFFER_SIZE = 2048;
private Socket socket;
private static final int SERVERPORT = 9999; //This is the port that we are connecting to
//Remember the channel simulator is 9998
private static final String SERVERIP = "10.0.2.2"; //This address is magically mapped to the host's loopback.
private static final String LOGTAG = "SocketTester";
boolean terminated = false;
private PrintWriter out = null;
private BufferedReader in = null;
Activity parentref;
/**
*
* @param parentRef Expects a reference to the calling activity, e.g. new ServerConnect(this);
*/
public ServerConnect(Activity parentRef)
{
parentref=parentRef;
}
/**
* Sends commands to the server. Called from UI thread via a button press
* @param cmd
*/
public void send(String cmd)
{
try
{
Log.i(LOGTAG,"Sending command: "+cmd);
out.println(cmd);
}
catch(Exception e)
{
Log.e(LOGTAG,"Failed to send command : "+e);
}
}
/**
* Main thread loop that grabs incoming messages
*/
public void run()
{
Log.i(LOGTAG,"Running socket thread");
try
{
// InetAddress svrAddr = InetAddress.getByName(SERVERIP);
byte[] Addr = new byte[]{10,0,2,2};
InetAddress svrAddr = InetAddress.getByAddress(Addr);
System.out.println("ADDRESS: " + svrAddr.toString());
/*
String IP = svrAddr.toString().substring(1);
InetAddress realAddr = InetAddress.getByName(IP);
System.out.println(IP);
System.out.println(realAddr.getAddress().toString());
*/
socket = new Socket(svrAddr, SERVERPORT);
// if (realAddr.isReachable(1000))
// System.out.println("Successfully reached");
//Setup i/o streams
out = new PrintWriter(new OutputStreamWriter(socket.getOutputStream()),true);
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
//Keep listening for messages from server
while(!terminated)
{
final String message = in.readLine();
if(message != null && message != "")
{
Log.i(LOGTAG,"MSG recv : "+message);
//Update GUI with any server responses
final TextView txtv = (TextView) parentref.findViewById(R.id.txtServerResponse);
parentref.runOnUiThread(new Runnable() {
@Override
public void run() {
/**
*
*
* This is where the the UI gets updated by the socket
*
*
*/
txtv.setText(message+"\n"+txtv.getText());
}
});
}
}
}
catch (UnknownHostException uhe)
{
Log.e(LOGTAG,"Unknownhost\n"+uhe.getStackTrace().toString());
}
catch (Exception e) {
Log.e(LOGTAG, "Socket failed\n"+e.getMessage());
e.printStackTrace();
}
disconnect();
Log.i(LOGTAG,"Thread now closing");
}
/**
* Disconnect from the server as well as closing i/o streams
*/
public void disconnect()
{
Log.i(LOGTAG, "Disconnecting from server");
try
{
in.close();
out.close();
}
catch(Exception e)
{/*do nothing*/}
try
{
socket.close();
}
catch(Exception e)
{/*do nothing*/}
}
}
这是我得到的日志输出：
03-30 21:08:39.846 1115-1115/uk.ac.man.cs.COMP28512.lab4 I/MainPAge﹕ onCreate entered
03-30 21:08:39.852 1115-1115/uk.ac.man.cs.COMP28512.lab4 I/SocketTester﹕ Running socket thread
03-30 21:08:39.861 1115-1115/uk.ac.man.cs.COMP28512.lab4 I/System.out﹕ ADDRESS: /10.0.2.2
03-30 21:08:39.867 1115-1115/uk.ac.man.cs.COMP28512.lab4 E/SocketTester﹕ Socket failed
null
03-30 21:08:39.868 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ android.os.NetworkOnMainThreadException
03-30 21:08:39.898 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1147)
03-30 21:08:39.898 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:110)
03-30 21:08:39.898 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at libcore.io.IoBridge.connectErrno(IoBridge.java:137)
03-30 21:08:39.898 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at libcore.io.IoBridge.connect(IoBridge.java:122)
03-30 21:08:39.899 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:183)
03-30 21:08:39.899 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:163)
03-30 21:08:39.899 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at java.net.Socket.startupSocket(Socket.java:590)
03-30 21:08:39.899 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at java.net.Socket.<init>(Socket.java:226)
03-30 21:08:39.912 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at uk.ac.man.cs.COMP28512.lab4.ServerConnect.run(ServerConnect.java:85)
03-30 21:08:39.913 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at uk.ac.man.cs.COMP28512.lab4.MainActivity.onCreate(MainActivity.java:33)
03-30 21:08:39.913 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at android.app.Activity.performCreate(Activity.java:5933)
03-30 21:08:39.913 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
03-30 21:08:39.913 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
03-30 21:08:39.913 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
03-30 21:08:39.913 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at android.app.ActivityThread.access0(ActivityThread.java:144)
03-30 21:08:39.913 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
03-30 21:08:39.914 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at android.os.Handler.dispatchMessage(Handler.java:102)
03-30 21:08:39.914 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at android.os.Looper.loop(Looper.java:135)
03-30 21:08:39.914 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at android.app.ActivityThread.main(ActivityThread.java:5221)
03-30 21:08:39.914 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at java.lang.reflect.Method.invoke(Native Method)
03-30 21:08:39.914 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at java.lang.reflect.Method.invoke(Method.java:372)
03-30 21:08:39.914 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
03-30 21:08:39.914 1115-1115/uk.ac.man.cs.COMP28512.lab4 W/System.err﹕ at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
03-30 21:08:39.915 1115-1115/uk.ac.man.cs.COMP28512.lab4 I/SocketTester﹕ Disconnecting from server
03-30 21:08:39.918 1115-1115/uk.ac.man.cs.COMP28512.lab4 I/SocketTester﹕ Thread now closing
03-30 21:08:39.982 1115-1132/uk.ac.man.cs.COMP28512.lab4 D/OpenGLRenderer﹕ Render dirty regions requested: true
03-30 21:08:40.002 1115-1115/uk.ac.man.cs.COMP28512.lab4 D/﹕ HostConnection::get() New Host Connection established 0xaeef7a20, tid 1115
03-30 21:08:40.086 1115-1115/uk.ac.man.cs.COMP28512.lab4 D/Atlas﹕ Validating map...
03-30 21:08:40.437 1115-1132/uk.ac.man.cs.COMP28512.lab4 D/﹕ HostConnection::get() New Host Connection established 0xaeef74a0, tid 1132
03-30 21:08:40.508 1115-1132/uk.ac.man.cs.COMP28512.lab4 I/OpenGLRenderer﹕ Initialized EGL, version 1.4
03-30 21:08:40.605 1115-1132/uk.ac.man.cs.COMP28512.lab4 D/OpenGLRenderer﹕ Enabling debug mode 0
03-30 21:08:40.677 1115-1132/uk.ac.man.cs.COMP28512.lab4 W/EGL_emulation﹕ eglSurfaceAttrib not implemented
03-30 21:08:40.678 1115-1132/uk.ac.man.cs.COMP28512.lab4 W/OpenGLRenderer﹕ Failed to set EGL_SWAP_BEHAVIOR on surface 0xa7a3b2e0, error=EGL_SUCCESS
03-30 21:08:40.812 1115-1115/uk.ac.man.cs.COMP28512.lab4 I/Choreographer﹕ Skipped 39 frames! The application may be doing too much work on its main thread.
03-30 21:08:41.773 1115-1115/uk.ac.man.cs.COMP28512.lab4 I/Choreographer﹕ Skipped 57 frames! The application may be doing too much work on its main thread.
查看错误并跟踪错误，我无法理解可能导致无法创建套接字的原因。
见What's the difference between Thread start() and Runnable run()
看起来您是在直接调用 运行() 而不是通过 start()。