我在处理邮件应用程序的服务器端时遇到问题。 我希望有更多的ServerController写在同一个TextArea上。 这些ServerController应该是具有不同字段值（ID，套接字和列表）的不同实例。
这是我的错误代码：
服务器加载UI并在不同的线程上运行MultiThreadHandler
public class Server extends Application {
@Override
public void start(Stage stage) throws Exception {
FXMLLoader loader = new FXMLLoader(getClass().getResource("FXMLServer.fxml"));
stage.setTitle("Mail Server");
stage.setScene(new Scene((Pane) loader.load()));
ServerController controller = loader.<ServerController>getController();
MultiThreadHandler handler = new MultiThreadHandler(controller);
new Thread(handler).start();
stage.show();
}
public static void main(String[] args) {
launch(args);
}
}
每当客户端请求连接时，MultithreadHandler都会创建一个ServerController线程
public class MultiThreadHandler implements Runnable{
private final ServerController controller;
public MultiThreadHandler(ServerController controller){
this.controller = controller;
}
@Override
public void run() {
try{
ServerSocket UI = new ServerSocket(8189);
while(true){
Socket UserInterface = UI.accept();
controller.setSocketUI(UserInterface);
new Thread(controller).start();
}
} catch(IOException e){
System.err.println(e.getMessage());
}
}
}
ServerSocket应该处理单个客户端。每个实例都应该有自己的ID，这是一个地址，它自己的Socket，用于与单个UI进行通信，以及它自己的列表，因为每个客户端都有它的邮件列表。相关部分代码标有**。
public class ServerController implements Runnable {
private final String path = "C:\\Users\\Federico\\Desktop\\MVC-MAIL\\MVC-MAIL\\MVC-MAIL\\src\\server\\";
@FXML
private TextArea srv;
@FXML
public void initialize() {
srv.setStyle("-fx-background-color:black;"
+ " -fx-control-inner-background:red;"
+ " -fx-font-family: Consolas; -fx-highlight-fill: #00ff00;"
+ " -fx-highlight-text-fill: #000000; "
+ " -fx-text-fill: #00ff00; ");
}
**private Socket socketUI;
private String ID;**
private transient ArrayList<Email> lista = null;
**public void setSocketUI(Socket socketUI) {
this.socketUI = socketUI;
}**
public void initSocket() throws Exception {
try {
srv.setText(srv.getText() + "\n" + "Waiting for client...");
srv.setText(srv.getText() + "\n" + "accepted");
try {
**ObjectInputStream in = new ObjectInputStream(socketUI.getInputStream());
ObjectOutputStream out = new ObjectOutputStream(socketUI.getOutputStream());**
try {
srv.setText(srv.getText() + "\n" + "reading mail ID...");
**ID = (String) in.readObject();//from client**
srv.setText(srv.getText() + "\n" + "ID: " + ID);
} catch (ClassNotFoundException ex) {
srv.setText(srv.getText() + "\n" + ex.getMessage());
}
srv.setText(srv.getText() + "\n" + "reading text file...");
**lista = readCSV(ID);**
srv.setText(srv.getText() + " DONE");
srv.setText(srv.getText() + "\n" + "writing email-list to client...");
out.writeObject(lista);
srv.setText(srv.getText() + " DONE");
while (true) {
try {
Object oggetto;
oggetto = in.readObject();
Class classe = oggetto.getClass();
int intero = 0;
if (classe.isInstance(intero)) { //Elimina mail
srv.setText(srv.getText() + "\n" + "Deleting email...");
int index = (int) oggetto;
lista = readCSV(ID);
lista.remove(index);
writeCSV(lista, ID);
srv.setText(srv.getText() + " DONE");
} else if (classe.isInstance(new ArrayList<>())) { //nuova mail
ArrayList<Email> incoming = (ArrayList<Email>) oggetto;
for (Email elem : incoming) {
String destinatario = elem.getDestinatario();
System.out.println("dest: " + destinatario);
File f = new File(path + destinatario + ".txt");
if (f.exists()) {
ArrayList<Email> casellaDest = readCSV(destinatario);
casellaDest.add(elem);
writeCSV(casellaDest, destinatario);
out.writeObject(true);
} else {
out.writeObject(false);
}
}
} else if (classe.isInstance(true)) {
lista = readCSV(ID);
out.writeObject(lista);
System.err.println(ID + " --> " + socketUI.getLocalAddress());
}
} catch (ClassNotFoundException ex) {
srv.setText(srv.getText() + "\n" + ex.getMessage());
}
}
} finally {
socketUI.close();
}
} catch (IOException e) {
srv.setText(srv.getText() + "\n" + e.getMessage());
}
}
private ArrayList<Email> readCSV(String address) {
// file esiste già?
ArrayList<Email> list = new ArrayList<>();
String csvFile = path + address + ".txt";
BufferedReader br = null;
String line;
try {
br = new BufferedReader(new FileReader(csvFile));
while ((line = br.readLine()) != null) {
if (!"".equals(line)) {
String[] riga = line.split("§ ");
String[] data = riga[4].split("-");
int anno = Integer.parseInt(data[0]);
int mese = Integer.parseInt(data[1]);
int giorno = Integer.parseInt(data[2]);
list.add(new Email(riga[0], riga[1], riga[2], riga[3], LocalDate.of(anno, mese, giorno)));
} else {
}
}
} catch (IOException ex) {
System.err.println(ex.getStackTrace()[0].getLineNumber());
} finally {
if (br != null) {
try {
br.close();
} catch (IOException e) {
srv.setText(srv.getText() + "\n" + e.getMessage());
}
}
}
return list;
}
private void writeCSV(ArrayList<Email> lista, String address) {
BufferedWriter bw = null;
String CSV = path + address + ".txt";
try {
bw = new BufferedWriter(new FileWriter(CSV));
for (Email mail : lista) {
String mittente = mail.getMittente() + "§ ";
String destinatario = mail.getDestinatario() + "§ ";
String titolo = mail.getTitolo() + "§ ";
String testo = mail.getTesto() + "§ ";
LocalDate data = mail.getData();
String riga = mittente + destinatario + titolo + testo + data;
bw.write(riga);
bw.newLine();
}
} catch (IOException ex) {
System.out.println(ex.getMessage());
} finally {
if (bw != null) {
try {
bw.flush();
bw.close();
} catch (IOException e) {
System.out.println(e.getMessage());
}
}
}
}
@Override
public void run() {
try {
initSocket();
} catch (Exception ex) {
System.out.println(ex.getMessage());
}
}
}