Question

急求一个JAVA编写的局域网聊天代码？不要求很复杂。只要可以在两台机子上简单的对话就可以。

Answer 1

//以下引入包
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
import java.applet.*;
public class regit extends JApplet implements ActionListener,ItemListener//接口
{
String s=null;
//对象的声明
JLabel labelname,labelpass,labelsxe,labeladdress,labelmail,labelphone;//标签
JTextField textname,textaddress,textmail,textphone;//文本框
JRadioButton r1,r2;//单选按纽
ButtonGroup bg;//组
JPasswordField textpass;//密码域
JButton buttonregit,buttonreset;//注册按纽 重写按纽
JPanel p;//面板
String sex;//定义性别字符串

URL url;//统一资源定位
BufferedWriter out1,out2;//流
BufferedReader in;

//布局方式
GridBagLayout gbl;
GridBagConstraints gc;
AppletContext co;//接口

//初始化
public void init()
{
//new 对象
labelname=new JLabel("用 户 名:");
labelpass=new JLabel("用户密码:");
labelsxe=new JLabel("性别:");
labeladdress=new JLabel("地址:");
labelmail=new JLabel("电子邮件:");
labelphone=new JLabel("联系电话:");

textname=new JTextField(15); textname.setForeground(Color.red);
textname.setToolTipText("请在这输入你的用户名");
textaddress=new JTextField(15);textaddress.setForeground(Color.red);
textaddress.setToolTipText("请在这输入你的地址");
textmail=new JTextField(15); textmail.setForeground(Color.red);
textmail.setToolTipText("请在这里输入你的E-mail地址");
textphone=new JTextField(15); textphone.setForeground(Color.red);
textphone.setToolTipText("请在这输入你的电话号码");

r1=new JRadioButton("男"); r1.setBackground(new Color(47,177,210));//设置颜色
r2=new JRadioButton("女"); r2.setBackground(new Color(47,177,210));//设置颜色
bg=new ButtonGroup();
bg.add(r1);bg.add(r2);//加入组,实现单选

textpass=new JPasswordField(15);
textpass.setToolTipText("在这里输入密码");
textpass.setForeground(Color.red);

buttonregit=new JButton("注册"); buttonregit.setBackground(new Color(47,177,210));//设置颜色
buttonregit.setToolTipText("点击按纽完成注册");
buttonreset=new JButton("填写"); buttonreset.setBackground(new Color(47,177,210));//设置颜色
buttonreset.setToolTipText("点击按纽刷新重写");

gbl=new GridBagLayout(); ///////////////////////////////////////
gc=new GridBagConstraints(); //////采用GridBagLayout布局方式////////

p=new JPanel();
p.setLayout(gbl);
p.setBackground(new Color(47,177,210));

this.getContentPane().add(p);//加入面板

gc.anchor=GridBagConstraints.NORTHWEST;
gc.gridx=2;
gc.gridy=2;
gbl.setConstraints(labelname,gc);
p.add(labelname);

gc.anchor=GridBagConstraints.NORTHWEST;
gc.gridx=4;
gc.gridy=2;
gbl.setConstraints(textname,gc);
p.add(textname);

gc.anchor=GridBagConstraints.NORTHWEST;
gc.gridx=2;
gc.gridy=4;
gbl.setConstraints(labelpass,gc);
p.add(labelpass);

gc.anchor=GridBagConstraints.NORTHWEST;
gc.gridx=4;
gc.gridy=4;
gbl.setConstraints(textpass,gc);
p.add(textpass);

gc.anchor=GridBagConstraints.NORTHWEST;
gc.gridx=2;
gc.gridy=6;
gbl.setConstraints(labelsxe,gc);
p.add(labelsxe);

gc.anchor=GridBagConstraints.NORTHWEST;
gc.gridx=4;
gc.gridy=6;
gbl.setConstraints(r1,gc);
p.add(r1);

gc.anchor=GridBagConstraints.NORTHWEST;
gc.gridx=5;
gc.gridy=6;
gbl.setConstraints(r2,gc);
p.add(r2);

gc.anchor=GridBagConstraints.NORTHWEST;
gc.gridx=2;
gc.gridy=8;
gbl.setConstraints(labeladdress,gc);
p.add(labeladdress);

gc.anchor=GridBagConstraints.NORTHWEST;
gc.gridx=4;
gc.gridy=8;
gbl.setConstraints(textaddress,gc);
p.add(textaddress);

gc.anchor=GridBagConstraints.NORTHWEST;
gc.gridx=2;
gc.gridy=10;
gbl.setConstraints(labelmail,gc);
p.add(labelmail);

gc.anchor=GridBagConstraints.NORTHWEST;
gc.gridx=4;
gc.gridy=10;
gbl.setConstraints(textmail,gc);
p.add(textmail);

gc.anchor=GridBagConstraints.NORTHWEST;
gc.gridx=2;
gc.gridy=12;
gbl.setConstraints(labelphone,gc);
p.add(labelphone);

gc.anchor=GridBagConstraints.NORTHWEST;
gc.gridx=4;
gc.gridy=12;
gbl.setConstraints(textphone,gc);
p.add(textphone);

gc.anchor=GridBagConstraints.NORTHWEST;
gc.gridx=2;
gc.gridy=16;
gbl.setConstraints(buttonregit,gc);
p.add(buttonregit);

gc.anchor=GridBagConstraints.NORTHWEST;
gc.gridx=4;
gc.gridy=16;
gbl.setConstraints(buttonreset,gc);
p.add(buttonreset);

/////////////////////////////////////////////
co=this.getAppletContext();
/////////////////////////////////////////////
buttonregit.addActionListener(this);//按纽事件的监听
buttonreset.addActionListener(this);//按纽事件的监听
r1.addItemListener(this);//选择事件的监听
r2.addItemListener(this);//选择事件的监听
textphone.addActionListener(this);
}
public void actionPerformed(ActionEvent e)
{
//注册按纽事件
if(e.getSource()==buttonregit)
{
String s1=textname.getText(); ////////////////////
String s2=new String(textpass.getPassword());////////////////////
String s3=textaddress.getText(); // 定义字符串 //
String s4=textmail.getText(); ////////////////////
String s5=textphone.getText(); ////////////////////
//判断注册资料 信息 是否为空
if(s1.length()==0 || s2.length()==0 ||s3.length()==0 ||s4.length()==0 ||s5.length()==0)
{
int error=JOptionPane.INFORMATION_MESSAGE;
JOptionPane.showMessageDialog(null,"资料不能为空，请重新注册！","【温馨提示】",error);
return;//弹出对话框并返回
}

try//写入到txt文件
{
in=new BufferedReader(new FileReader("d:\\迷离视线聊天室\\password.txt"));
}
catch(Exception ee){}
String ss=s1;
try
{
while((s=in.readLine())!=null)
{
if(s.startsWith(ss))
{
JOptionPane.showMessageDialog(null,"用户名已经存在，请更换名字！");
textname.setText("");//设置为空，重新输入
textpass.setText("");
textaddress.setText("");
textmail.setText("");
textphone.setText("");
return;
}
}
}
catch(Exception ee){}
///////////////////////////以上代码判断是否有同名

{
try
{
out1=new BufferedWriter(new FileWriter("d:\\迷离视线聊天室\\password.txt",true));
out2=new BufferedWriter(new FileWriter("d:\\迷离视线聊天室\\message.txt",true));
}//创建文件
catch(Exception ee)
{}

try
{
out1.write(s1+"#"+s2);//写
out1.newLine();
out2.write("用户名："+s1);
out2.newLine();
out2.write("密码："+s2);
out2.newLine();
out2.write("性别："+sex);
out2.newLine();
out2.write("地址："+s3);
out2.newLine();
out2.write("电子邮件："+s4);
out2.newLine();
out2.write("电话："+s5);
out2.newLine();
out1.flush();
out2.flush();//清理缓冲
out1.close();
out2.close();
}
catch(Exception ee)
{}
JOptionPane.showMessageDialog(null,"注册成功！");
try
{
String qss="http://localhost/chatroom/chatjiemian.htm";
url=new url(/qss);//连接上网址
co.showDocument(url);
}
catch(Exception exx)
{}
}

}
//////////////////////以下为回车事件
if(e.getSource()==textphone)
{
String s1=textname.getText(); ////////////////////
String s2=new String(textpass.getPassword());////////////////////
String s3=textaddress.getText(); // 定义字符串 //
String s4=textmail.getText(); ////////////////////
String s5=textphone.getText(); ////////////////////
//判断注册资料 信息 是否为空
if(s1.length()==0 || s2.length()==0 ||s3.length()==0 ||s4.length()==0 ||s5.length()==0)
{
int error=JOptionPane.INFORMATION_MESSAGE;
JOptionPane.showMessageDialog(null,"资料不能为空，请重新注册！","【温馨提示】",error);
return;//弹出对话框并返回
}

try//写入到txt文件
{
in=new BufferedReader(new FileReader("d:\\迷离视线聊天室\\password.txt"));
}
catch(Exception ee){}
String ss=s1;
try
{
while((s=in.readLine())!=null)
{
if(s.startsWith(ss))
{
JOptionPane.showMessageDialog(null,"用户名已经存在，请更换名字！");
textname.setText("");//设置为空，重新输入
textpass.setText("");
textaddress.setText("");
textmail.setText("");
textphone.setText("");
return;
}
}
}
catch(Exception ee){}
///////////////////////////以上代码判断是否有同名

{
try
{
out1=new BufferedWriter(new FileWriter("d:\\迷离视线聊天室\\password.txt",true));
out2=new BufferedWriter(new FileWriter("d:\\迷离视线聊天室\\message.txt",true));
}//创建文件
catch(Exception ee)
{}

try
{
out1.write(s1+"#"+s2);//写
out1.newLine();
out2.write("用户名："+s1+"密码："+s2+"性别："+sex+"地址："+s3+"电子邮件："+s4+"电话："+s5);//写
out2.newLine();
out1.flush();
out2.flush();//清理缓冲
out1.close();
out2.close();
}
catch(Exception ee)
{}
JOptionPane.showMessageDialog(null,"注册成功！");
try
{
String qss="http://localhost/chatroom/chatjiemian.htm";
url=new url(/qss);//连接上网址
co.showDocument(url);
}
catch(Exception exx)
{}
}

}
if(e.getSource()==buttonreset)//刷新重写事件
{
textname.setText("");
textpass.setText("");
textaddress.setText("");
textmail.setText("");
textphone.setText("");
}

}
//////////////////////////////////////////
//
public void itemStateChanged(ItemEvent ex)
{
if(ex.getSource()==r1)
{
sex=new String("男");
}
else if(ex.getSource()==r2)
{
sex=new String("女");
}
}
}
参考资料：试试看,刚在网上找的

Answer 2

客户端：
import java.io.*;
import java.net.*;
import java.awt.*;
import java.awt.event.*;

public class ChatClient extends Frame
{
TextArea ta = new TextArea();
TextField tf = new TextField();
public void launchFrame() throws Exception
{
this.add(ta, BorderLayout.CENTER);
this.add(tf, BorderLayout.SOUTH);
tf.addActionListener(
new ActionListener()
{
public void actionPerformed(ActionEvent ae)
{
try {
String sSend = tf.getText();
if(sSend.trim().length() == 0) return;
ChatClient.this.send(sSend);
tf.setText("");
ta.append(sSend + "\n");
}
catch (Exception e) { e.printStackTrace(); }
}
}
);

this.addWindowListener(
new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
}
);
setBounds(300,300,300,400);
setVisible(true);
tf.requestFocus();
}

Socket s = null;

public ChatClient() throws Exception
{
s = new Socket("127.0.0.1", 8888);
launchFrame();
(new Thread(new ReceiveThread())).start();
}

public void send(String str) throws Exception
{
DataOutputStream dos = new DataOutputStream(s.getOutputStream());
dos.writeUTF(str);
}

public void disconnect() throws Exception
{
s.close();
}

public static void main(String[] args) throws Exception
{
BufferedReader br = new BufferedReader (
new InputStreamReader(System.in));
ChatClient cc = new ChatClient();
String str = br.readLine();
while(str != null && str.length() != 0)
{
cc.send(str);
str = br.readLine();
}
cc.disconnect();
}

class ReceiveThread implements Runnable
{
public void run()
{
if(s == null) return;
try {
DataInputStream dis = new DataInputStream(s.getInputStream());
String str = dis.readUTF();
while (str != null && str.length() != 0)
{
//System.out.println(str);
ChatClient.this.ta.append(str + "\n");
str = dis.readUTF();
}
}
catch (Exception e)
{
e.printStackTrace();
}

}
}
}

服务器：
import java.net.*;
import java.util.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;

public class ChatServer extends Frame
{
TextArea ta = new TextArea();
public void launchFrame()
{
add(ta, BorderLayout.CENTER);
setBounds(0,0,200,300);
this.addWindowListener(
new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
}
);
setVisible(true);
}

ServerSocket server = null;
Collection cClient = new ArrayList();

public ChatServer(int port) throws Exception
{
server = new ServerSocket(port);
launchFrame();
}

public void startServer() throws Exception
{
while(true)
{
Socket s = server.accept();
cClient.add( new ClientConn(s) );
ta.append("NEW-CLIENT " + s.getInetAddress() + ":" + s.getPort());
ta.append("\n" + "CLIENTS-COUNT: " + cClient.size() + "\n\n");
}
}

class ClientConn implements Runnable
{
Socket s = null;
public ClientConn(Socket s)
{
this.s = s;
(new Thread(this)).start();
}

public void send(String str) throws IOException
{
DataOutputStream dos = new DataOutputStream(s.getOutputStream());
dos.writeUTF(str);
}

public void dispose()
{
try {
if (s != null) s.close();
cClient.remove(this);
ta.append("A client out! \n");
ta.append("CLIENT-COUNT: " + cClient.size() + "\n\n");
}
catch (Exception e)
{
e.printStackTrace();
}
}

public void run()
{
try {

DataInputStream dis = new DataInputStream(s.getInputStream());
String str = dis.readUTF();
while(str != null && str.length() !=0)
{
System.out.println(str);
for(Iterator it = cClient.iterator(); it.hasNext(); )
{
ClientConn cc = (ClientConn)it.next();
if(this != cc)
{
cc.send(str);
}
}
str = dis.readUTF();
//send(str);
}
this.dispose();
}
catch (Exception e)
{
System.out.println("client quit");
this.dispose();
}

}
}

public static void main(String[] args) throws Exception
{
ChatServer cs = new ChatServer(8888);
cs.startServer();
}
}
（来自BJSXT）

Answer 3

下面是可以直接运行的代码

发消息时，将ip栏填入对方的地址，只要两台机子都运行这个程序就能正常对话了。

import java.lang.*;
import java.awt.*;
import java.net.*;
import java.awt.event.*;

public class j03130301 extends Frame implements Runnable
{
Label L1,L2;
TextField text1,text2;
Button B1;
List list1;
public j03130301()
{
this.setLayout( null );
//========================================
L1 = new Label("对方 IP：");
L1.setBounds(10,30,60,30);
this.add(L1);
L2 = new Label("发言：");
L2.setBounds(10,70,60,30);
this.add(L2);
text1 = new TextField("127.0.0.1", 20);
text1.setBounds(75,30,200,30);
this.add(text1);
text2 = new TextField();
text2.setBounds(75,70,320,30);
this.add(text2);
B1 = new Button("send");
B1.setBounds(400,70,60,30);
B1.addMouseListener( new myMouseListener() );
this.add(B1);
list1 = new List(15);
list1.setBounds(15,110,450,300);
this.add(list1);
//========================================
this.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
this.setTitle("使用 UDP 的网络聊天程序");
this.setBounds(100,100,480,430);
this.setVisible( true );
}//public j03130301() end
public void run()
{ //接收数据
while( true )
{ //持续接收送到本地端的信息
byte[] buf = new byte[100];//预期最多可收 100 个 byte
try
{
DatagramSocket DS = new DatagramSocket( 2222 );
//用 2222 port 收
/* 只管接收要送到本地端 2222 port 的数据包，
不必管该数据包是从远程的那个 port 送出。 */
DatagramPacket DP = new DatagramPacket( buf,buf.length );
//将数据收到 buf 数组
DS.receive( DP ); //接收数据包
list1.add( "来自 " + DP.getAddress().getHostAddress()
+ ":" + DP.getPort() + " ＞"
+ new String( buf ).trim() );
//此处用 new String(DP.getData()).trim() 也一样
DS.close();
Thread.sleep(200); //停 0.2 秒
}
catch(Exception excep){}
}
} // void run() end

class myMouseListener extends MouseAdapter
{ //送数据
public void mouseClicked(MouseEvent e)
{ //每次 Click 按钮就发送信息到目的端主机
String msg = text2.getText().trim();
String ipStr = text1.getText().trim();
try
{
DatagramSocket DS = new DatagramSocket();
//以任一目前可用的port 送
DatagramPacket DP
= new DatagramPacket( msg.getBytes(),
msg.getBytes().length,
InetAddress.getByName(ipStr),
2222 ); //送到远程的 2222 port
DS.send( DP ); //送出数据包
list1.add( "送出：" + msg.trim() ); //给自己看的记录
DS.close();
}
catch(Exception excep){}
} //void mouseClicked(MouseEvent e) end
} //class myMouseListener end

public static void main(String arg[])
{
j03130301 Form1 = new j03130301();
Thread threadObj = new Thread( Form1 );
threadObj.start();//启动接收信息的线程
} //void main(String arg[]) end
} //class j03130301 end