【发布时间】：2015-08-12 15:48:55
【问题描述】：
我正在用 java 制作一个简单的应用程序客户端服务器，我希望我的手机能够接收和发送消息到我的电脑，我在同一个局域网上，我的电脑的 ip 是 192.168.1.8，我的 serverSocket 正在端口上运行7777。 由于某种原因，我的客户端 android 无法连接，我认为这是因为我在线程中创建了一个套接字，我已经读过我应该使用 AsyncTask 或 Handle，我也尝试过，但我也遇到了异常。
类服务器：
public class MyServer implements Runnable{
private ServerSocket server;
private ObjectInputStream in;
private ObjectOutputStream out;
private Socket clientedConnected;
public ExampleServerZNuC(){
try {
server= new ServerSocket(7777);
System.out.println("server opened on port 7777");
} catch (IOException ex) {
Logger.getLogger(MyServer.class.getName()).log(Level.SEVERE, null, ex);
}
}
public void sendMessage(String message){
try {
out.writeObject(message);
out.flush();
} catch (IOException ex) {
Logger.getLogger(MyServer.class.getName()).log(Level.SEVERE, null, ex);
}
}
public void sendNotifiy(){
try {
out.writeObject("Send Notify");
out.flush();
} catch (IOException ex) {
Logger.getLogger(MyServer.class.getName()).log(Level.SEVERE, null, ex);
}
}
public String getMessage(){
return "";
}
public void run(){
System.out.println("method run started");
System.out.println("Waiting for a client to connect");
try {
Socket clientedConnected;
clientedConnected = server.accept();
System.out.println("A client connected : "+clientedConnected.getInetAddress().getHostAddress());
in= new ObjectInputStream(clientedConnected.getInputStream());
out = new ObjectOutputStream(clientedConnected.getOutputStream());
} catch (IOException ex) {
Logger.getLogger(MyServer.class.getName()).log(Level.SEVERE, null, ex);
}
System.out.println("End of method Run");
} }
这是我创建运行服务器时得到的输出：
server opened on port 7777
method run started
Waiting for a client to connect
客户端安卓： 连接到我的服务器的类（atm 我只是希望它接收消息）：
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OptionalDataException;
import java.net.Socket;
import java.net.UnknownHostException;
import android.util.Log;
import android.view.View;
import android.widget.TextView;
public class MyConnect implements Runnable{
private Socket myconnect=null ;
private TextView txtMessage;
private ObjectInputStream in;
private ObjectOutputStream out;
public MyConnect( ){
try {
// this is my pc's IP, my phone is connected to same LAN
Log.d("inizializating socket","");
myconnect= new Socket("192.168.1.8",7777);
in = new ObjectInputStream(myconnect.getInputStream());
out = new ObjectOutputStream(myconnect.getOutputStream());
} catch (UnknownHostException e) {
Log.d("My Error connecting",e.getMessage());
} catch (IOException e) {
Log.d("My Error connecting",e.getMessage());
}
}
@Override
public void run() {
try {
String message = (String)in.readObject();
Log.d("messaged recived",message);
} catch (OptionalDataException e) {
Log.d("My Error connecting",e.getMessage());
} catch (ClassNotFoundException e) {
Log.d("Error My ClassNotFoundException",e.getMessage());
} catch (IOException e) {
Log.d("Error My IOEXCEPTION",e.getMessage());
}
}
}
这是我单击应创建套接字的按钮时遇到的错误： 在创建时我使用 connect=new MyConnect(); 在我使用的 onclick 事件中：
@Override
public void onClick(View v) {
switch(v.getId()){
case R.id.btnExample:
new Thread(connect).start();
break;
}
}
错误信息：
05-29 19:02:05.905: E/AndroidRuntime(6520): FATAL EXCEPTION: main
05-29 19:02:05.905: E/AndroidRuntime(6520): android.os.NetworkOnMainThreadException
05-29 19:02:05.905: E/AndroidRuntime(6520): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1118)
05-29 19:02:05.905: E/AndroidRuntime(6520): at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84)
05-29 19:02:05.905: E/AndroidRuntime(6520): at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
05-29 19:02:05.905: E/AndroidRuntime(6520): at libcore.io.IoBridge.connect(IoBridge.java:112)
05-29 19:02:05.905: E/AndroidRuntime(6520): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
05-29 19:02:05.905: E/AndroidRuntime(6520): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
05-29 19:02:05.905: E/AndroidRuntime(6520): at java.net.Socket.startupSocket(Socket.java:566)
05-29 19:02:05.905: E/AndroidRuntime(6520): at java.net.Socket.tryAllAddresses(Socket.java:127)
编辑：
class MySyncTask extends AsyncTask<Integer, Integer, String>{
String advice;
@Override
protected String doInBackground(Integer... params) {
try {
s = new Socket("192.168.1.8",7777);
Log.d("socket connected","");
ObjectInputStream streamReader = new ObjectInputStream(s.getInputStream());
advice = (String)streamReader.readObject();
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return "";
}
protected void onPostExecute(String result) {
txtMessage.setText("you got a message: " + advice);
}
protected void onPreExecute() {
Log.d("my started","start");
}
}
我用过
MySyncTask asyncTask=new MySyncTask ();
asyncTask.execute();
onCreate() 方法，但由于某种原因它没有连接到我的服务器
带有 AsyncTask 的 LogCat：
05-29 19:46:21.900: D/my started(26169): start
05-29 19:46:22.020: D/libEGL(26169): loaded /system/lib/egl/l ibEGL_mali.so
05-29 19:46:22.030: D/libEGL(26169): loaded /system/lib/egl/libGLESv1_CM_mali.so
05-29 19:46:22.040: D/libEGL(26169): loaded /system/lib/egl/libGLESv2_mali.so
05-29 19:46:22.080: D/OpenGLRenderer(26169): Enabling debug mode 0
编辑问题已解决
在互联网上搜索为什么套接字无法连接后，我发现有人遇到类似问题，我在这里找到了答案Android Socket not being instantiated 我必须先初始化套接字然后使用连接
【问题讨论】：
-
如果我在 onCreate() 方法上启动线程也是一样的
标签： java android multithreading sockets android-asynctask