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为什么服务器可以'；在java中使用套接字时，是否无法从客户端读取布尔值？

java sockets

为什么服务器可以'；在java中使用套接字时，是否无法从客户端读取布尔值？,java,sockets,Java,Sockets,我试着用2人在线制作卡罗游戏。我称之为“MrA”和“Mrb”。在我的程序中，当“Mra”邀请“Mrb”时，“Mrb”可以接受或拒绝。但当我试图在“Mrb”收到“Mra”的邀请后从“Mrb”向服务器发送数据时，出现了一个错误（“Mrb”可以从服务器读取数据，但不能回复服务器）。这是我的代码： 代码： 服务器： 输出： 服务器： Mra客户： Mrb客户： 更新：用户类： 注意：我首先保存了套接字。但它不起作用，我试着拯救河流 package model; import java.io.DataI

我试着用2人在线制作卡罗游戏。我称之为“MrA”和“Mrb”。在我的程序中，当“Mra”邀请“Mrb”时，“Mrb”可以接受或拒绝。但当我试图在“Mrb”收到“Mra”的邀请后从“Mrb”向服务器发送数据时，出现了一个错误（“Mrb”可以从服务器读取数据，但不能回复服务器）。这是我的代码：

代码：

服务器：

输出： 服务器：

Mra客户：

Mrb客户：

更新：用户类：

注意：我首先保存了套接字。但它不起作用，我试着拯救河流

package model;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

public class User {
    private String userName;
    private DataInputStream dataInputStream;
    private DataOutputStream dataOutputStream;
    private ObjectOutputStream objectOutputStream;
    private ObjectInputStream objectInputStream;

    public User() {
    }
    
    public User(String userName, DataInputStream dataInputStream, DataOutputStream dataOutputStream, ObjectOutputStream objectOutputStream, ObjectInputStream objectInputStream) {
        this.userName = userName;
        this.dataInputStream = dataInputStream;
        this.dataOutputStream = dataOutputStream;
        this.objectOutputStream = objectOutputStream;
        this.objectInputStream = objectInputStream;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }
    
    public DataInputStream getDataInputStream() {
        return dataInputStream;
    }

    public void setDataInputStream(DataInputStream dataInputStream) {
        this.dataInputStream = dataInputStream;
    }

    public DataOutputStream getDataOutputStream() {
        return dataOutputStream;
    }

    public void setDataOutputStream(DataOutputStream dataOutputStream) {
        this.dataOutputStream = dataOutputStream;
    }

    public ObjectOutputStream getObjectOutputStream() {
        return objectOutputStream;
    }

    public void setObjectOutputStream(ObjectOutputStream objectOutputStream) {
        this.objectOutputStream = objectOutputStream;
    }

    public ObjectInputStream getObjectInputStream() {
        return objectInputStream;
    }

    public void setObjectInputStream(ObjectInputStream objectInputStream) {
        this.objectInputStream = objectInputStream;
    }
    
}
运行客户端

/*
*要更改此许可证标题，请在“项目属性”中选择“许可证标题”。
*要更改此模板文件，请选择工具|模板
*然后在编辑器中打开模板。
*/
包视图；
导入控制器。客户端；
导入javax.swing.JOptionPane；
/**
*
*@作者黄
*/
公共类LoginForm扩展了javax.swing.JFrame{
/**
*创建新表单LoginForm
*/
私人客户；
公共登录表单（）{
初始化组件（）；
this.client=新客户端（）；
}
/**
*从构造函数中调用此方法来初始化表单。
*警告：不要修改此代码。此方法的内容始终为
*由表单编辑器重新生成。
*/
@抑制警告（“未选中”）
//                           
私有组件（）{
jButton1=newjavax.swing.JButton（）；
jTextField1=newjavax.swing.JTextField（）；
jButton2=newjavax.swing.JButton（）；
setDefaultCloseOperation（javax.swing.WindowConstants.EXIT_ON_CLOSE）；
jButton1.setText（“邀请”）；
jButton1.addActionListener（新java.awt.event.ActionListener（）{
public void actionPerformed（java.awt.event.ActionEvent evt）{
jButton1ActionPerformed（evt）；
}
});
jButton2.setText（“登录”）；
jButton2.addActionListener（新java.awt.event.ActionListener（）{
public void actionPerformed（java.awt.event.ActionEvent evt）{
jButton2ActionPerformed（evt）；
}
});
javax.swing.GroupLayout=newjavax.swing.GroupLayout（getContentPane（））；
getContentPane（）.setLayout（布局）；
layout.setHorizontalGroup(
createParallelGroup（javax.swing.GroupLayout.Alignment.LEADING）
.addGroup（layout.createSequentialGroup（）
.addGap（158158158）
.addComponent（jButton1）
.addContainerGap（javax.swing.GroupLayout.DEFAULT\u SIZE，Short.MAX\u VALUE））
.addGroup（layout.createSequentialGroup（）
.addGap（84,84,84）
.addComponent（jTextField1，javax.swing.GroupLayout.PREFERRED_SIZE，111，javax.swing.GroupLayout.PREFERRED_SIZE）
.addPreferredGap（javax.swing.LayoutStyle.ComponentPlacement.RELATED，72，Short.MAX_值）
.addComponent（jButton2）
.addGap（76,76,76））
);
layout.setVerticalGroup(
createParallelGroup（javax.swing.GroupLayout.Alignment.LEADING）
.addGroup（javax.swing.GroupLayout.Alignment.TRAILING，layout.createSequentialGroup（）
.addGap（43,43,43）
.addGroup（layout.createParallelGroup（javax.swing.GroupLayout.Alignment.BASELINE）
.addComponent（jTextField1，javax.swing.GroupLayout.PREFERRED\u SIZE，javax.swing.GroupLayout.DEFAULT\u SIZE，javax.swing.GroupLayout.PREFERRED\u SIZE）
.addComponent（jButton2））
.addPreferredGap（javax.swing.LayoutStyle.ComponentPlacement.RELATED，96，Short.MAX_值）
.addComponent（jButton1）
.addGap（115、115、115））
);
包装（）；
}//                         
私有void jButton2ActionPerformed（java.awt.event.ActionEvent evt）{
//TODO在此处添加您的处理代码：
字符串userName=jTextField1.getText（）；
this.client.login（用户名）；
System.out.println（“用户名：”+用户名）；
}                                        
私有void jButton1ActionPerformed（java.awt.event.ActionEvent evt）{
//TODO在此处添加您的处理代码：
如果（本客户邀请（“Mra”））{
showMessageDialog（这是“邀请成功加入Mra”）；
}
}                                        
/**
*@param指定命令行参数
*/
公共静态void main（字符串参数[]）{
/*设置Nimbus的外观和感觉*/
//
/*如果Nimbus（在JavaSE6中引入）不可用，请使用默认的外观。
*详情请参阅http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
*/
试一试{
for（javax.swing.UIManager.LookAndFeelInfo:javax.swing.UIManager.getInstalledLookAndFeels（））{
if（“Nimbus”.equals（info.getName（）））{
setLookAndFeel（info.getClassName（））；
打破
}
}
}捕获（ClassNotFoundException ex）{
getLogger（LoginForm.class.getName（））.log（java.util.logging.Level.SEVERE，null，ex）；
}catch（实例化异常）{
getLogger（LoginForm.class.getName（））.log（java.util.logging.Level.SEVERE，null，ex）；
}捕获（非法访问例外）{
getLogger（LoginForm.class.getName（））.log（java.util.logging.Level.SEVERE，null，ex）；
}catch（javax.swing.UnsupportedLookAndFeelException ex）{
getLogger（LoginForm.class.getName（））.log（java.util.logging.Level.SEVERE，null，ex）；
}
//
//

class ClientHandler implements Runnable {

    private Socket socket;
    private User userConnected;
    private volatile boolean stop;
    private ArrayList<User> listUsers;

    private DataOutputStream dataOutStream;
    private DataInputStream dataInStream;
    private ObjectOutputStream objOutStream;
    private ObjectInputStream objInStream;

    public ClientHandler() {
    }

    public ClientHandler(Socket socket, ArrayList<User> listUsers) {
        this.socket = socket;
        this.listUsers = listUsers;
        this.userConnected = null;
        this.stop = false;

        try {
            dataOutStream = new DataOutputStream(socket.getOutputStream());
            dataInStream = new DataInputStream(socket.getInputStream());
            objOutStream = new ObjectOutputStream(socket.getOutputStream());
            objInStream = new ObjectInputStream(socket.getInputStream());

        } catch (IOException e) {
            System.out.println("Error when create in/output stream! " + e);
        }
    }

    @Override
    public void run() {
        while (!stop) {
            try {
                String code = dataInStream.readUTF();
                switch (code) {
                    case "login": {
                        loginUser();
                    }
                    break;

                    case "invite": {
                        boolean inviteSucess = inviteUser();
                        dataOutStream.writeBoolean(inviteSucess);
                        dataOutStream.flush();
                    }
                    break;

                }
                // display user login success
                for (User user : listUsers) {
                    System.out.println("User Name:" + user.getUserName());
                }
                System.out.println("+++++++++++++");
            } catch (IOException e) {
                try {
                    socket.close();
                    dataInStream.close();
                    dataOutStream.close();
                    objInStream.close();
                    objOutStream.close();
                } catch (IOException ex) {
                    System.out.println("Can not close connection! " + ex);
                }
                stop = true;
            }
        }
    }

    private void loginUser() {
        try {
            String userName = dataInStream.readUTF();
            userConnected = new User(userName, dataInStream, dataOutStream, objOutStream, objInStream);
            listUsers.add(userConnected);
        } catch (IOException e) {
            System.out.println(e);
        }
    }

    private boolean inviteUser() {
        boolean inviteSucces = false;
        try {
            String invitedName = dataInStream.readUTF();

            for (User user : listUsers) {
                if (user.getUserName().equals(invitedName)) {

                    
                    user.getDataOutputStream().writeUTF("invite");
                    user.getDataOutputStream().flush();
                    user.getDataOutputStream().writeUTF(userConnected.getUserName());
                    user.getDataOutputStream().flush();
                    System.out.println("send username success");
                    inviteSucces = user.getDataInputStream().readBoolean(); //error here. user.getDataInputStream() can not read boolean from client.
                    System.out.println(inviteSucces+ "read boolean from client success");
                }
            }
        } catch (IOException e) {
            System.out.println(e);
        }
        return inviteSucces;
    }

}



package controller;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.Socket;

public class Client implements Runnable {

    private Socket socket;
    private final int PORT = 4444;
    private final String HOST = "localhost";
    private volatile boolean stop;

    private DataOutputStream dataOutStream;
    private DataInputStream dataInStream;
    private ObjectOutputStream objOutStream;
    private ObjectInputStream objInStream;

    public Client() {
        try {
            this.socket = new Socket(HOST, PORT);
            this.stop = false;

            try {
                dataOutStream = new DataOutputStream(socket.getOutputStream());
                dataInStream = new DataInputStream(socket.getInputStream());
                objOutStream = new ObjectOutputStream(socket.getOutputStream());
                objInStream = new ObjectInputStream(socket.getInputStream());
                Thread t = new Thread(this);
                t.start();
            } catch (IOException e) {
                System.out.println("Error when create in/output stream! " + e);
            }
        } catch (IOException e) {
            System.out.println("Can not create client server! " + e);
        }
    }

    @Override
    public void run() {
        while (!stop) {
            try {
                String code = dataInStream.readUTF();
                switch (code) {
                    case "invite": {
                        String userInvite = dataInStream.readUTF();
                        System.out.println("Inviter name:"+userInvite);
                         System.out.println("Before send true to server");
                        dataOutStream.writeBoolean(true);
                         System.out.println("After send true to server");
                        dataOutStream.flush();
                    }
                    break;
                }

            } catch (IOException e) {
                System.out.println("Can not read from dataInStream! " + e);
                try {
                    socket.close();
                    dataInStream.close();
                    dataOutStream.close();
                    objInStream.close();
                    objOutStream.close();
                } catch (IOException ex) {
                    System.out.println("Can not close connection! " + ex);
                }
                stop = true;
            }
        }
    }

    public void login(String userName) {
        try {
            dataOutStream.writeUTF("login");
            dataOutStream.flush();
            dataOutStream.writeUTF(userName);
            dataOutStream.flush();
        } catch (IOException e) {
            System.out.println(e);
        }
    }
    public boolean invite(String invitedName){
        boolean inviteSucess = false;
        try {
            dataOutStream.writeUTF("invite");
            dataOutStream.flush();
            dataOutStream.writeUTF(invitedName);
            dataOutStream.flush();
            inviteSucess = dataInStream.readBoolean();
        } catch (IOException e) {
            System.out.println(e);
        }
        return inviteSucess;
    }

    

}



Server start at port 4444
Connect to server success!
Connect to server success!
User Name:Mra
+++++++++++++
User Name:Mra
User Name:Mrb
+++++++++++++
send username success



User Name: Mra
Inviter name:Mrb
Before send true to server
After send true to server



User Name: Mrb



package model;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

public class User {
    private String userName;
    private DataInputStream dataInputStream;
    private DataOutputStream dataOutputStream;
    private ObjectOutputStream objectOutputStream;
    private ObjectInputStream objectInputStream;

    public User() {
    }
    
    public User(String userName, DataInputStream dataInputStream, DataOutputStream dataOutputStream, ObjectOutputStream objectOutputStream, ObjectInputStream objectInputStream) {
        this.userName = userName;
        this.dataInputStream = dataInputStream;
        this.dataOutputStream = dataOutputStream;
        this.objectOutputStream = objectOutputStream;
        this.objectInputStream = objectInputStream;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }
    
    public DataInputStream getDataInputStream() {
        return dataInputStream;
    }

    public void setDataInputStream(DataInputStream dataInputStream) {
        this.dataInputStream = dataInputStream;
    }

    public DataOutputStream getDataOutputStream() {
        return dataOutputStream;
    }

    public void setDataOutputStream(DataOutputStream dataOutputStream) {
        this.dataOutputStream = dataOutputStream;
    }

    public ObjectOutputStream getObjectOutputStream() {
        return objectOutputStream;
    }

    public void setObjectOutputStream(ObjectOutputStream objectOutputStream) {
        this.objectOutputStream = objectOutputStream;
    }

    public ObjectInputStream getObjectInputStream() {
        return objectInputStream;
    }

    public void setObjectInputStream(ObjectInputStream objectInputStream) {
        this.objectInputStream = objectInputStream;
    }
    
}



/*
 * 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.
 */
package view;

import controller.Client;
import javax.swing.JOptionPane;

/**
 *
 * @author hoang
 */
public class LoginForm extends javax.swing.JFrame {

    /**
     * Creates new form LoginForm
     */
    private Client client;
    public LoginForm() {
        initComponents();
        this.client = new Client();
    }

    /**
     * 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();
        jTextField1 = new javax.swing.JTextField();
        jButton2 = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jButton1.setText("Invite");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });

        jButton2.setText("Login");
        jButton2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton2ActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(158, 158, 158)
                .addComponent(jButton1)
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
            .addGroup(layout.createSequentialGroup()
                .addGap(84, 84, 84)
                .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 111, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 72, Short.MAX_VALUE)
                .addComponent(jButton2)
                .addGap(76, 76, 76))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addGap(43, 43, 43)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jButton2))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 96, Short.MAX_VALUE)
                .addComponent(jButton1)
                .addGap(115, 115, 115))
        );

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

    private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        // TODO add your handling code here:
        String userName = jTextField1.getText();
        this.client.login(userName);
        System.out.println("User Name: "+userName);
    }                                        

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        // TODO add your handling code here:
        if(this.client.invite("Mra")){
            JOptionPane.showMessageDialog(this, "Invite success to Mra");
        }
    }                                        

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* 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(LoginForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(LoginForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(LoginForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(LoginForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>
        //</editor-fold>

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

    // Variables declaration - do not modify                     
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton2;
    private javax.swing.JTextField jTextField1;
    // End of variables declaration                   
}