Java套接字在终端上不发送数据
我正在用java开发一个聊天应用程序,我面临着一个部署问题。 即使我的应用程序在通过IDE(IntelliJ中的服务器和Netbeans中的客户端)执行时运行平稳,但当我尝试通过终端运行服务器时,服务器仍不能正常工作。我所说的“不正确”是指服务器正在接收来自用户的消息,但没有响应 例如,客户端执行的前三个步骤是:Java套接字在终端上不发送数据,java,multithreading,sockets,command-line,Java,Multithreading,Sockets,Command Line,我正在用java开发一个聊天应用程序,我面临着一个部署问题。 即使我的应用程序在通过IDE(IntelliJ中的服务器和Netbeans中的客户端)执行时运行平稳,但当我尝试通过终端运行服务器时,服务器仍不能正常工作。我所说的“不正确”是指服务器正在接收来自用户的消息,但没有响应 例如,客户端执行的前三个步骤是: 登录 获取用户列表 获取组列表 即使服务器正在接收这些消息/请求,它也不会响应 我将服务器的每个连接分配给一个新线程,因为这是一个多客户端应用程序 知道发生了什么吗 以下是终端中输
- 登录
- 获取用户列表
- 获取组列表
public class ThreadedServer {
ServerSocket serverSocket;
private static Socket welcomeSocket = null;
public ThreadedServer() {
try {
serverSocket = new ServerSocket(ServerConfiguration.SERVER_PORT);
System.out.println("Server started");
} catch (Exception e) {
e.printStackTrace();
}
while (true) {
try {
welcomeSocket = serverSocket.accept();
System.out.println("Connection accepted: " + welcomeSocket.getInetAddress() + ":" + welcomeSocket.getLocalPort());
Thread t = new Thread(new ClientConnection(welcomeSocket));
t.start();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
这是一个客户端连接类,我在其中处理接收到的消息并发送想要的消息
公共类ClientConnection实现可运行{
private final Socket clientSocket;
private DataInputStream dis;
private DataOutputStream dos;
private int sessionId;
private int userId;
private String username;
private ClientConnection self;
public ClientConnection(Socket client) {
this.clientSocket = client;
this.self = this;
}
public DataOutputStream getOutputStream() {
return dos;
}
@Override
public void run() {
System.out.println("Client Thread started!");
initializeDataStreams();
startListeningForMessages();
}
private void initializeDataStreams() {
try {
dis = new DataInputStream(clientSocket.getInputStream());
dos = new DataOutputStream(clientSocket.getOutputStream());
System.out.println("Server: Initialized Streams");
} catch (IOException ex) {
Logger.getLogger(ClientConnection.class.getName()).log(Level.SEVERE, null, ex);
}
}
private void startListeningForMessages() {
new Thread(new Runnable() {
@Override
public void run() {
try {
String message;
while ((message = dis.readUTF()) != null) {
System.err.println("Recieved from client: " + message);
if (ServerConfiguration.LOG_COMMUNICATION_MESSAGES) {
System.out.println("client message string recieved \" "
+ message + " \"");
}
processMessage(message);
}
} catch (IOException ex) {
// 1) Remove the connection from the list of connections.
ConnectionManager.getInstance().removeConnection(self);
// 2) Inform database for logout time AND Error Messege!
DatabaseAction.logout(sessionId, "Unknown Error occurred");
}
}
}).start();
}
private void processMessage(String messege) {
Messege inbound = new Gson().fromJson(messege, Messege.class);
if (inbound.getType() == MessegeType.login) {
performLogin(inbound);
} else if (inbound.getType() == MessegeType.logout) {
performLogout(inbound);
} else if (inbound.getType() == MessegeType.simple_messege) {
sendMessege(inbound);
} else if (inbound.getType() == MessegeType.group_messege) {
sendGroupMessege(inbound);
} else if (inbound.getType() == MessegeType.get_all_users) {
getAllUsers();
} else if (inbound.getType() == MessegeType.get_groups_im_involved_in) {
getGroupsImInvolvedIn();
} else if (inbound.getType() == MessegeType.get_messeges_from_user) {
getMessegesFromUser(inbound);
} else if (inbound.getType() == MessegeType.get_messeges_from_group) {
getMessegesFromGroup(inbound);
} else if (inbound.getType() == MessegeType.create_new_group) {
createNewGroup(inbound);
}
}
private void sendGroupMessege(Messege inbound) {
new SendGroupMessegeAction(this, inbound);
}
public void close() {
try {
dis.close();
dos.close();
clientSocket.close();
} catch (IOException ex) {
Logger.getLogger(ClientConnection.class.getName()).log(Level.SEVERE, null, ex);
}
}
private void performLogin(Messege messege) {
LoginAction la = new LoginAction(messege.getUser(), messege, this);
this.username = messege.getUser();
this.sessionId = la.getSessionId();
this.userId = la.getUserId();
}
private void performLogout(Messege messege) {
new LogoutAction(this, messege);
}
public void sendMessege(Messege messege) {
new SendSimpleMessegeAction(this, messege);
}
public int getSessionId() {
return sessionId;
}
public int getUserId() {
return userId;
}
public String getUsername() {
return username;
}
private void getAllUsers() {
try {
System.out.println("Sending all users to client " + username);
UsersObject uo = DatabaseAction.getAllUsers(userId);
GetAllUsersMessege gaum = new GetAllUsersMessege(uo.getUsernames(), uo.areOnline(), uo.getHasSentMessegesThatAreUnread());
Messege m = new Messege("", MessegeType.get_all_users, new Gson().toJson(gaum));
System.out.println("Sent from server: " + new Gson().toJson(m));
dos.writeUTF(new Gson().toJson(m));
dos.flush();
} catch (IOException ex) {
Logger.getLogger(ClientConnection.class.getName()).log(Level.SEVERE, null, ex);
}
}
这是从客户端到服务器的连接
public class ServerConnection {
DataInputStream dis;
static DataOutputStream dos;
Socket socket;
public static ServerConnection instance;
public static ServerConnection getInstance() {
if (instance == null) {
instance = new ServerConnection();
}
return instance;
}
private ServerConnection() {
initializeConnection();
startListeningThread();
}
private void initializeConnection() {
try {
socket = new Socket(MyStatics.server_address, 3333);
dis = new DataInputStream(socket.getInputStream());
dos = new DataOutputStream(socket.getOutputStream());
System.out.println("Client: Connection Initialized");
} catch (IOException ex) {
Logger.getLogger(ServerConnection.class
.getName()).log(Level.SEVERE, null, ex);
}
}
private void startListeningThread() {
new Thread(new Runnable() {
@Override
public void run() {
try {
String line = "";
while (!socket.isClosed() && (line = dis.readUTF()) != null) {
System.out.println("Recieved from Server: " + line);
Messege m = new Gson().fromJson(line, Messege.class);
processMessege(m);
}
} catch (IOException ex) {
// Logger.getLogger(ServerConnection.class.getName()).log(Level.SEVERE, null, ex);
if (!ex.getMessage().equals("Socket closed")) {
`enter code here`Logger.getLogger(ServerConnection.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
}).start();
}
private void processMessege(Messege m) {
if (m.getType() == MessegeType.get_all_users) {
GetAllUsersMessege gaum = new Gson().fromJson(m.getEnv(), GetAllUsersMessege.class);
MainWindow.usersData = gaum.getUsers();
MainWindow.usersOnline = gaum.getOnline();
MainWindow.usersWhoSentSomething = gaum.getHasSentMessegesThatAreUnread();
MainWindow.changeData();
} else if (m.getType() == MessegeType.get_groups_im_involved_in) {
GetGroupsImInvolvedInMessege ggiiim = new Gson().fromJson(m.getEnv(), GetGroupsImInvolvedInMessege.class);
MainWindow.groupsData = ggiiim.getGroups();
MainWindow.changeData();
} else if (m.getType() == MessegeType.simple_messege) {
SimpleMessege sm = new Gson().fromJson(m.getEnv(), SimpleMessege.class);
MainWindow.informThatMessegeIsRecieved(m.getUser());
System.out.println("Recieved simple messege");
for (ChatBox chatBox : MyInstances.chatBoxes) {
if (chatBox.getTo().equals(m.getUser())) {
System.out.println("Chatbox was found");
chatBox.appendRecievedMessege(sm.getMessege());
}
}
...
...
}
}
编辑:我添加了代码片段。可能的问题(不确定):0)关于
readUTF
和writeUTF
IDE可以在一个字符集(可能是UTF-8)中调用服务器和客户机,而在终端中您不设置它,所以它从OS继承 在终端中,将字符集设置为UTF-8(对于服务器和客户端),然后重试。例如(
java-Dfile.encoding=UTF-8-jar
)
另外,如果您总是从服务器和客户端发送纯字符串(无原语/二进制),则可以使用BufferedReader
和PrintStream
/PrintStream
而不是datainputerreader
和Writer
1) 为了确保运行的是最新/正确的文件,请在netbeans中始终右键单击project,然后执行清理和生成操作
希望能有所帮助。如果您能共享负责的代码,那将非常有帮助。如果没有服务器处理连接的确切方法,我们无法正确帮助您。