我正在创建一个聊天程序，其中包含我在新版JavaFx场景构建器中创建的GUI。我有一个扩展应用程序的main方法，我的GUI中有一个simpleController（控制所有按钮，标签，anchorPanes等）。
除此之外，我有一个可以接收和发送消息的服务器应用程序。为此，我创建了以下简单协议：
命令/说明：
使用这个简单的逻辑，我可以很容易地让用户连接，聊天和断开连接。然而，事实证明，应该是一项简单的任务已成为我最糟糕的噩梦。
到目前为止，我的用户连接到程序没有问题，更多用户可以同时连接。
当我想在服务器和客户端之间发送和接收消息时，事情开始变得棘手。
我不知道在使用线程时如何更新GUI。我试图阅读Task类，但我无法看到是否应该使用它而不是线程，或者线程应该将其作为参数。
我应该创建一个监听输入并使该类扩展线程的新类吗？ 或
该线程应该在我的simpleController类中运行吗？
主要
public class Main extends Application{
public static void main(String[] args) throws IOException{
Application.launch(Main.class, (java.lang.String[]) null);
}
@Override
public void start(Stage primaryStage) throws Exception {
try {
AnchorPane page = (AnchorPane) FXMLLoader.load(Main.class.getResource("testingBackground.fxml"));
Scene scene = new Scene(page);
primaryStage.setScene(scene);
primaryStage.setTitle("Chatten");
primaryStage.show();
} catch (Exception ex) {
java.util.logging.Logger.getLogger(Main.class.getName()).log(
java.util.logging.Level.SEVERE, null, ex);
}
}
}
simpleController
import java.io.IOException;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.Scanner;
import java.io.IOException;
import java.net.URL;
import java.util.ResourceBundle;
import com.sun.glass.ui.Platform;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.concurrent.Task;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.fxml.Initializable;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextArea;
import javafx.scene.control.TextField;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.AnchorPane;
import javafx.scene.text.Text;
/*
* evt ret array listen med commands da jeg selv kan styre hvilke commands der kommer ind og ud! og brugeren faktisk
* aldrig selv kan vælge!
*/
public class SimpleController extends Thread implements Initializable{
public Button btn_Connect;
public AnchorPane pictureFrame;
public Socket socket = new Socket();
public PrintWriter pw;
public Scanner input;
public int clientId = 1;
public Client client = new Client(socket, pw, input, clientId);
// options!
public TextField txt_userName;
public TextField textField_chat;
// send button
public Button Send;
/*
* current client that the user i connected with, this client is used to send commands and tell other clients who is connected on
* what "ingame chat persons"
*/
public static int currentClientId;
// chatperson username
public Label lbl_userName2;
public Label lbl_userName3;
public Label lbl_chatPerson2;
public Label lbl_Chatperson1_userName;
//Pictures of chat person
public Label chatPerson3;
public Label chatPerson1;
// chat persons textfield
public TextArea txt_ChatPerson1;
//public TextField txt_ChatPerson1;
public TextField txt_ChatPerson2;
public TextField txt_ChatPerson3;
@Override
public void initialize(URL location, ResourceBundle resources) throws NullPointerException {
try {
client.connect();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
pictureFrame.setMaxSize(409, 373);
txt_ChatPerson1.setMinWidth(50);
txt_ChatPerson1.setPrefWidth(50);
txt_ChatPerson1.setMaxWidth(300);
txt_ChatPerson1.setText(" ");
btn_Connect.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent event) throws NullPointerException {
connectMeWithOthers(1);
}
});
Send.setOnAction(new EventHandler<ActionEvent>() {
// WORK IN PROGReSS!!
@Override
public void handle(ActionEvent event) {
/*
* new line code:
*/
String x = textField_chat.getText();
txt_ChatPerson1.setText(x);
txt_ChatPerson1.setVisible(true);
System.out.println("x" +x);
txt_ChatPerson1.textProperty().addListener(new ChangeListener<String>() {
@Override
public void changed(
ObservableValue<? extends String> observable,
String oldValue, String newValue) {
// txt_ChatPerson1.setPrefRowCount(5);
txt_ChatPerson1.setPrefWidth(txt_ChatPerson1.getText().length()*7);
//txt_ChatPerson1.setPrefHeight(txt_ChatPerson1.getText().length()*3);
}
});
txt_ChatPerson1.autosize();
client.SendChat(x);
}
});
}
/**
* this method connect the client to the other clients who are online on the server!
* the method calls it self after the user has established connection in order to load the other chat persons online
* if the client is the online user online then it will only load the user
* @param id
*/
protected void connectMeWithOthers(int id) {
try {
int responseId = client.sendCommando(id);
System.out.println(" response id "+responseId);
// finds whom is connected and tries to connect to a spot that is avalibul!
//Response is the ID of the chat persons
switch (responseId) {
case 1:
currentClientId = client.reciveCommando();
client.setClientId(currentClientId);
client.sendString(txt_userName.getText());
connectMeWithOthers(5);
break;
case 5:
int times = client.reciveCommando();
int o = 0;
System.out.println("times: "+times);
while (o != times) {
int j = client.reciveCommando();
System.out.println("j"+ j);
String name = client.reciveString();
System.out.println("Name " +name);
createUser(j, name);
o++;
}
start();
break;
case 10:
System.out.println("Connection fail chat room is full! Please try again later!");
case 8:
start();
break;
default:
break;
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private void createUser(int j, String reciveChat) {
if (j == 1) {
chatPerson1.setVisible(true);
lbl_Chatperson1_userName.setVisible(true);
lbl_Chatperson1_userName.setText(reciveChat);
}else if (j == 2) {
lbl_chatPerson2.setVisible(true);
lbl_userName2.setVisible(true);
lbl_userName2.setText(reciveChat);
}else if (j == 3){
chatPerson3.setVisible(true);
lbl_userName3.setVisible(true);
lbl_userName3.setText(reciveChat);
}else {
Image img = new Image(getClass().getResourceAsStream("Figur.png"));
Label test2 = new Label("", new ImageView(img));
test2.setLayoutX(50);
test2.setLayoutY(30);
test2.setPrefSize(1000, 1000);
pictureFrame.getChildren().addAll(test2);
test2.setVisible(true);
}
}
/*
* denne metode er en rewrite af run metoden.
*/
public void StartClient(){
ClientListner cl = new ClientListner(client);
Task task = new Task<String>() {
@Override
protected String call() throws Exception {
// TODO Auto-generated method stub
return null;
}
};
Thread t = new Thread(task);
cl.start();
while (true) {
if (cl.recived) {
}
}
}
/*
* Run metoden er brugt til at recive data fra andre users og update GUI'en skal muligvis rewrites!?
*
*/
public void run(){
System.out.println("Thread started");
System.out.println(client.getSocket().isConnected());
ClientListner cl = new ClientListner(client);
while (client.getSocket().isConnected()) {
int key = 10;
if (cl.recived) {
try {
key = client.reciveCommando();
System.out.println("jeg er her");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
System.out.println("Key "+key);
switch (key) {
// case 2 er recive chat:
case 2:
// først find ud af hvilket ID der har sendt chatten:
int y = 0;
try {
y = client.reciveCommando();
System.out.println("y" + y);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// derefter få beskeden og send den så ud til resten.
String says = client.reciveChat().toString();
if (y == 1) {
txt_ChatPerson1.setText(client.reciveChat());
}else if (y == 2) {
}else {
chatPerson3.setVisible(true);
txt_ChatPerson3.setVisible(true);
txt_ChatPerson3.setText(client.reciveChat());
}
break;
default:
break;
}
}
}
}
客户端
import java.io.IOException;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.Socket;
import java.util.Scanner;
public class Client {
// disse var static
public final static int portNumber = 6040;
public Socket socket;
private PrintWriter pw;
private Scanner input;
private int clientId;
/**
* @param args
* @throws IOException
*/
public Client(Socket socket, PrintWriter pw, Scanner input, int clientId){
this.socket = socket;
this.pw = pw;
this.input = input;
this.clientId = clientId;
}
public void connect() throws IOException{
// du kan vælge at bruge inetadressen til at connecte i socketet.
InetAddress adr = InetAddress.getByName("localhost");
socket = new Socket("localhost", portNumber);
input=new Scanner(socket.getInputStream());
pw = new PrintWriter(socket.getOutputStream());
}
/**
* This method sends the message (that the client(chat person) writes to the user)
* @param x
* @throws NullPointerException
* @throws IOException
*/
public void SendChat(String x) throws NullPointerException{
pw.println(2);
pw.flush();
pw.println(SimpleController.currentClientId);
pw.flush();
pw.println(x);
pw.flush();
}
public int sendCommando(int id) throws IOException{
System.out.println("Jeg sender"+ id);
pw.println(id);
pw.flush();
/*
* this part of the program sends a command to the server if the command is 1 then 1 is = Connect.
* the program then ask the server is the server is full or is it ok to connect?
* if the response is not 10 then the program will allow a connection to happen the return type will be the Id of which
* the chat person becomes!
*/
// should the method return 0 the Application will do NOTHING!
switch (id) {
case 1:
int k = reciveCommando();
if (k== 10) {
return 10;
}else if (k < 3) {
System.out.println("returned k" + k);
return k;
}else {
return 10;
}
/*
* Closes the connection with the server!
*/
case 3:
socket.close();
return 0;
case 5:
int y = reciveCommando();
return y;
default:
return 0;
}
}
/*
* this method recives a command from the server! the comands can be found in the ChatCommands.txt
* returns the command as an integer!
*/
public int reciveCommando() throws IOException{
Integer i = input.nextInt();
return i;
}
/**
* Gets a String response from the server. This method i used to create other users and give them the correct username.
*
* @param i
* @return
* @throws IOException
*/
public String getStringResponse(int i) throws IOException {
pw.print(i);
pw.flush();
String x = input.nextLine();
return x;
}
/*
* Work in progress - client getter og setter methoder!
*/
public Socket getSocket(){
return socket;
}
public Scanner getInput(){
return input;
}
public PrintWriter getPw(){
return pw;
}
public int getClientId(){
return clientId;
}
public void setClientId(int i ){
clientId = i;
}
public String reciveChat(){
String x = getInput().next();
return x;
}
public String reciveString(){
String x =input.next();
return x;
}
public void sendString(String x){
pw.println(x);
pw.flush();
}
}*
我真的很抱歉代码有点乱。简单控制器中的run（）方法是尝试创建simpleController的线程。但是，这并没有像我预期的那样有效。 ：（
这主要是为了确保聊天室中的两个人可以一起聊天。所以，它所要做的就是更新1或2个textareas。
答案 0 :(得分：5)
如果您还没有这样做，请检查一下
答案 1 :(得分：2)
这花了我一点时间才找到所以我想我会在这里记录下来。
Platform.runLater(new Runnable(){
@Override
public void run() {
// Update your GUI here.
}
});
答案 2 :(得分：1)
这已经过时了，但是因为它是谷歌的，我想指出你最好的选择是使用
FXObservableList
或
Bean Properties喜欢
DoubleProperty
哪些是线程安全的。
答案 3 :(得分：0)
如果你正在使用Java 8：
Platform.runLater(() -> {
// Update your GUI here.;
});