[英]java.net.ConnectException: Connection refused TCP
目標 -我要將在Java(PC)項目中輸入的文本發送到顯示此文本的android應用。該PC已連接到由android移動設備創建的wifi熱點。
PC /客戶端Java項目代碼:
public class EcsDemo {
public static void main(String[] args) {
System.out.println("Enter SSID to connect :");
Scanner in = new Scanner(System.in);
String ssid = in.nextLine();
System.out.println("You entered ssid " + ssid);
System.out.println("Connecting to ssid ..");
DosCommand.runCmd(DosCommand.connectToProfile(ssid));
// netsh wlan connect name=
System.out.println("initializing tcp client ..");
try {
TCPClient.startTCpClient();
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
public class TCPClient {
public static void startTCpClient() throws UnknownHostException, IOException{
String FromServer;
String ToServer;
Socket clientSocket = new Socket("localhost", 5000);
BufferedReader inFromUser = new BufferedReader(new InputStreamReader(
System.in));
PrintWriter outToServer = new PrintWriter(
clientSocket.getOutputStream(), true);
BufferedReader inFromServer = new BufferedReader(new InputStreamReader(
clientSocket.getInputStream()));
while (true) {
FromServer = inFromServer.readLine();
if (FromServer.equals("q") || FromServer.equals("Q")) {
clientSocket.close();
break;
} else {
System.out.println("RECIEVED:" + FromServer);
System.out.println("SEND(Type Q or q to Quit):");
ToServer = inFromUser.readLine();
if (ToServer.equals("Q") || ToServer.equals("q")) {
outToServer.println(ToServer);
clientSocket.close();
break;
} else {
outToServer.println(ToServer);
}
}
}
}
}
Android應用/服務器代碼:
public class MainActivity extends Activity {
private String TAG = "MainActivity";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Log.i(TAG, "starting server");
new ServerAsyncTask().execute();
}
}
public class ServerAsyncTask extends AsyncTask<Void, Void, Void> {
@Override
protected Void doInBackground(Void... params) {
try {
TCPServer.startTCPServer();// initTCPserver();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
public static void startTCPServer() throws IOException{
String fromclient;
String toclient;
ServerSocket Server = new ServerSocket(5000);
System.out.println("TCPServer Waiting for client on port 5000");
Log.i("startTCPServer","TCPServer Waiting for client on port 5000");
while (true) {
Socket connected = Server.accept();
System.out.println(" THE CLIENT" + " " + connected.getInetAddress()
+ ":" + connected.getPort() + " IS CONNECTED ");
Log.i("startTCPServer"," THE CLIENT" + " " + connected.getInetAddress()
+ ":" + connected.getPort() + " IS CONNECTED ");
BufferedReader inFromUser = new BufferedReader(
new InputStreamReader(System.in));
BufferedReader inFromClient = new BufferedReader(
new InputStreamReader(connected.getInputStream()));
PrintWriter outToClient = new PrintWriter(
connected.getOutputStream(), true);
while (true) {
// System.out.println("SEND(Type Q or q to Quit):");
// toclient = inFromUser.readLine();
//
// if (toclient.equals("q") || toclient.equals("Q")) {
// outToClient.println(toclient);
// connected.close();
// break;
// } else {
// outToClient.println(toclient);
// }
fromclient = inFromClient.readLine();
if (fromclient.equals("q") || fromclient.equals("Q")) {
connected.close();
break;
} else {
System.out.println("RECIEVED:" + fromclient);
}
}
}
}
}
在運行android應用之后,然后當我運行java項目時,出現以下異常:
java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at com.expressecs.javademo.TCPClient.startTCpClient(TCPClient.java:15)
at com.expressecs.javademo.EcsDemo.main(EcsDemo.java:41)
我已經提到以下鏈接:
java.net.ConnectException:連接被拒絕
謝謝!
您嘗試連接的IP:端口沒有監聽。
您的服務器未啟動,或者正在偵聽其他端口,或者綁定到127.0.0.1,而不是0.0.0.0或公共IP地址。
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