java.net.ConnectException：连接拒绝TCP
目标 – 我想将java（PC）项目中输入的文本发送到显示此文本的android应用程序.PC连接到android mobile创建的wifi热点。
PC /客户端java项目代码：
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 app / Server代码：
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 { @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); } } } } }
运行Android应用程序后，当我运行java项目时，我得到以下exception：
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.(Unknown Source) at java.net.Socket.(Unknown Source) at com.expressecs.javademo.TCPClient.startTCpClient(TCPClient.java:15) at com.expressecs.javademo.EcsDemo.main(EcsDemo.java:41)
我已经提到了以下链接：
java.net.ConnectException：连接被拒绝
谢谢！
您正在尝试连接的IP端口没有任何内容。
您的服务器未启动，或正在侦听其他端口，或者绑定到127.0.0.1而不是0.0.0.0或公共IP地址。