Question

我是JAVA和我的大学项目的新手，我必须编写一个RMI应用程序。

我编写了一个服务器类，一个客户端类和一个JFrame类。

服务器和客户端之间的连接正在运行，并且我可以在它们之间进行通信。

为了可视化客户端（现在是JFrame类的子代），我已经对上面提到的JFrame类进行了编码。在这个JFrame类中，我实例化了客户端。

现在，让我们终于解决了我的问题：

我在服务器类中调用方法A，它在客户端中调用方法B，并且此方法B应该在JFrame类中调用方法C.具体来说，我想在JFrame类的JTextArea中追加一个String，但这不起作用。这是代码。非常感谢提前。

服务器代码：

import java.io.Serializable;
import java.rmi.AccessException;
import java.rmi.NotBoundException;
import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
import java.util.ArrayList;
import javax.swing.JLabel;
import javax.swing.JTextArea;

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
/**
 *
 * @author Sebbo
 */
public class ServerImpl implements IServer, Serializable {
    public static ArrayList<IClient> spielerliste = new ArrayList();
    public static ArrayList<IClient> readyListe = new ArrayList();
    private ArrayList benutzernamen = new ArrayList();
    private ServerFenster serverfenster;
    private int anzahlKarten = 7;
    ArrayList<Card> kartendeck;
    /*
    public ServerImpl(ServerFenster serverFenster) {
        this.serverfenster = serverFenster;
    }
    */

    public ServerImpl() {

    }

    @Override
    public void clientAnmelden(String benutzername, String clientIndex) throws NotBoundException, RemoteException, AccessException{

        System.out.println(benutzername + " beim Spiel angemeldet!");
        benutzernamen.add(benutzername);
        for (int i = 0; i < benutzernamen.size(); i++ ) {
            System.out.println(benutzernamen.get(i).toString());
        }

        //Find Client
        Registry registry = LocateRegistry.getRegistry();
        IClient tmpClient = (IClient) registry.lookup( clientIndex );

        spielerliste.add(tmpClient);
        //serverfenster.jPanelHinzufuegen(benutzername);
    } 

    @Override
    public void spielStarten(ArrayList<IClient> readyliste) throws RemoteException {
        kartendeck = Card.kartendeckErzeugen();
        this.kartenAnSpielerVerteilen(readyliste);
    }

    @Override
    public void spielerlisteAnzahlAusgeben() throws RemoteException {
        System.out.println(this.spielerliste.size());
    }

    @Override
    public ArrayList<IClient> spielerlisteAusgeben() throws RemoteException {
        return this.spielerliste;
    }

    /**
     *
     * @param IClient
     */
    public void kartenAnSpielerVerteilen(ArrayList<IClient> readyliste) throws RemoteException {
        for (int i = 0; i < readyliste.size(); i++) {
            readyliste.get(i).handNehmen(kartendeck, anzahlKarten);
            readyliste.get(i).handAusgeben();
            System.out.println("Hand ausgeteilt.");
        }
    }

    @Override
    public void readyListeChecken() throws RemoteException {
        // spielerliste durchgehen und Spieler, die bereit sind, in ReadyListe verschieben
        for (int i = 0; i < spielerliste.size(); i++) {
            if (spielerliste.get(i).getSpielerstatus()) {
                IClient tmpClient = spielerliste.get(i);
                spielerliste.remove(spielerliste.get(i));
                readyListe.add(tmpClient);
            }
        }

        int anzahlBereiterSpieler = 0;
        for (int i = 0; i < readyListe.size(); i++) {
            if (readyListe.get(i).getSpielerstatus()) {
                anzahlBereiterSpieler++;
            }
        }

        if (anzahlBereiterSpieler < 2) {
            System.out.println("Anzahl bereiter Spieler: " + anzahlBereiterSpieler);
        } else {
            System.out.println("Anzahl bereiter Spieler: " + anzahlBereiterSpieler);
            System.out.println("Spiel wird gestartet.");
            spielStarten(this.readyListe);
        }

        anzahlBereiterSpieler = 0;
    }

    public void broadcastMessage(String message) throws RemoteException {
        System.out.println(message);
        for(int i =0; i<spielerliste.size(); i++) {
            spielerliste.get(i).nachrichtEmpfangen(message);
        }
    }
}

客户代码：

import java.io.Serializable;
import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
import java.rmi.server.UnicastRemoteObject;
import java.util.ArrayList;
import java.util.Scanner;
import javax.swing.JTextArea;

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
/**
 *
 * @author Sebbo
 */
public class ClientImpl extends ClientFenster implements IClient, Serializable {

    private static final long serialVersionUID = 1L;
    //private ArrayList<Card> cards;
    private IServer server;
    private IClient client;
    private String benutzername;
    private ArrayList<Card> hand;
    private boolean spielerBereit = true;
    private boolean spielerAmZug = false;

    private static int clientIndex = 0;
    public ClientImpl(IServer server, String benutzername) throws Exception{
                this.hand = new ArrayList();
        this.benutzername = benutzername;
                this.server = server;
                this.server.clientAnmelden(this.benutzername, registerClient());
    }       

        @Override
        public void handNehmen(ArrayList<Card> kartendeck, int anzahlKarten) {
            for (int i = 0; i < anzahlKarten; i++) {
                this.hand.add(kartendeck.get(0));
                kartendeck.remove(kartendeck.get(0));
            }
        }

        int playerIndex;
        private String registerClient() throws RemoteException{

            //Search in all registry keys
            //last clientXX +1

            String key = "Client" + clientIndex++;
            client = (IClient) UnicastRemoteObject.exportObject( this, 0 );
            Registry registry = LocateRegistry.getRegistry();
            int index = 0;

            registry.rebind(key, client );



            return key;
        }

        private int getNumberOfPlayers(){
            String keyNumOfPlayers = "playerIndex";
            //Registry=> playerIndex:int

            return -1;
        }
        private void setNumberOfPlayers(){
           //Registry <= playerIndex:int 
        }
        @Override
        public void handAusgeben() throws RemoteException{
            for (Card karte : hand) {
                System.out.println(karte.getFarbe() + " - " + karte.getWert() + " - " + karte.getID());
            }
        }

    @Override
        public String getBenutzername() throws RemoteException{
            return this.benutzername;
        }

    @Override
        public boolean getSpielerstatus() throws RemoteException{
            return this.spielerBereit;
        }

    @Override
        public void bereitMelden() throws RemoteException{
            this.spielerBereit = true;
            this.server.readyListeChecken();
        }

    @Override
        public boolean getSpielerAmZug() throws RemoteException{
            return this.spielerAmZug;
        }

    @Override
    public void setSpielerAmZugTrue() throws RemoteException {
        this.spielerAmZug = true;
    }

    @Override
    public void setSpielerAmZugFalse() throws RemoteException {
        this.spielerAmZug = false;
    }

    /*
    Methode, die wartet, vom Server ausgelöst zu werden und dann eine Nachricht übermittelt und zurückgibt.
    */

    /**
     *
     * @param message
     * @throws RemoteException
     */


    public void nachrichtEmpfangen(String message) throws RemoteException {
        // Code
        nachrichtInTextAreaEinfuegen(message);
    }

    public IServer getServer() {
        return this.server;
    }
}

JFrame代码：

import java.awt.event.KeyEvent;
import java.io.Serializable;
import java.rmi.NotBoundException;
import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JTextArea;

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 * @author Sebbo
 */
public class ClientFenster extends javax.swing.JFrame {
    private static IClient client;
    static int playerIndex = 0;
    private static ClientImpl clientImpl;
    private ClientFenster fenster = this;
    /**
     * Creates new form ClientFenster
    */

    public JTextArea getJTextArea2() {
        return jTextArea2;
    }

    public ClientFenster() {
        initComponents();
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jButton1 = new javax.swing.JButton();
        jScrollPane1 = new javax.swing.JScrollPane();
        jTextArea1 = new javax.swing.JTextArea();
        jScrollPane2 = new javax.swing.JScrollPane();
        jTextArea2 = new javax.swing.JTextArea();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jButton1.setText("Hand ausgeben");

        jTextArea1.setColumns(20);
        jTextArea1.setRows(5);
        jTextArea1.addKeyListener(new java.awt.event.KeyAdapter() {
            public void keyReleased(java.awt.event.KeyEvent evt) {
                jTextArea1KeyReleased(evt);
            }
        });
        jScrollPane1.setViewportView(jTextArea1);

        jTextArea2.setColumns(20);
        jTextArea2.setRows(5);
        jScrollPane2.setViewportView(jTextArea2);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                    .addComponent(jScrollPane2)
                    .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 267, Short.MAX_VALUE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jButton1)
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap(178, Short.MAX_VALUE)
                .addComponent(jButton1)
                .addGap(50, 50, 50)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 38, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap())
            .addGroup(layout.createSequentialGroup()
                .addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 232, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(0, 0, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>                        

    private void jTextArea1KeyReleased(java.awt.event.KeyEvent evt) {                                       
        if (evt.getKeyCode()==KeyEvent.VK_ENTER){
            Date d1 = new Date();
            SimpleDateFormat df = new SimpleDateFormat("HH:mm:ss ");
            String formattedDate = df.format(d1);
            try {
                clientImpl.getServer().broadcastMessage("[" + formattedDate + "] " + clientImpl.getBenutzername() +": " +  jTextArea1.getText());
            } catch (RemoteException ex) {
                Logger.getLogger(ClientFenster.class.getName()).log(Level.SEVERE, null, ex);
            }

            jTextArea1.setText(null);
        }
    }                                      

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) throws RemoteException, NotBoundException, Exception {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(ClientFenster.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(ClientFenster.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(ClientFenster.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(ClientFenster.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new ClientFenster().setVisible(true);
            }
        });

    Registry registry = LocateRegistry.getRegistry();
    IServer server = (IServer) registry.lookup( "Server" );


    String benutzername = "Tim";
    clientImpl = new ClientImpl(server, benutzername);
  }

    /*public Client() {
        this.client = (IClient) new Client();
    }*/


    // Variables declaration - do not modify                     
    private javax.swing.JButton jButton1;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JScrollPane jScrollPane2;
    private javax.swing.JTextArea jTextArea1;
    private javax.swing.JTextArea jTextArea2;
    // End of variables declaration                   

    /**
     *
     * @param message
     */
    public void nachrichtInTextAreaEinfuegen(String message) {
        jTextArea2.append(message);
        jTextArea2.revalidate();
        jTextArea2.repaint();
    }
}

很多，很多人提前感谢并抱歉我的错误代码和英语; - ）

Answer 1

问题已经解决了。一切正常，但JTextArea没有自动滚动，因此代码在第一行上方附加了字符串，并且它不可见。

一位朋友用插入来修复它：

jTextArea2.setCaretPosition(jTextArea2.getText().length() - 1);

感谢您的帮助，我将来会尝试以更好的方式发布。遗憾。

在JTextArea中附加文本不起作用

1 个答案: