用JAVA 编写简单网络聊天程序

/**

专业领域包括成都做网站、网站设计、商城网站开发、微信营销、系统平台开发， 与其他网站设计及系统开发公司不同，创新互联的整合解决方案结合了帮做网络品牌建设经验和互联网整合营销的理念，并将策略和执行紧密结合，为客户提供全网互联网整合方案。

* 基于UDP协议的聊天程序

*

* 2007.9.18

* */

//导入包

import java.awt.*;

import java.awt.event.*;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.*;

import java.net.*;

public class Chat extends JFrame implements ActionListener

{

//广播地址或者对方的地址

public static final String sendIP = "172.18.8.255";

//发送端口9527

public static final int sendPort = 9527;

JPanel p = new JPanel();

List lst = new List(); //消息显示

JTextField txtIP = new JTextField(18); //填写IP地址

JTextField txtMSG = new JTextField(20); //填写发送消息

JLabel lblIP = new JLabel("IP地址:");

JLabel lblMSG = new JLabel("消息:");

JButton btnSend = new JButton("发送");

byte [] buf;

//定义DatagramSocket的对象必须进行异常处理

//发送和接收数据报包的套接字

DatagramSocket ds = null;

//=============构造函数=====================

public Chat()

{

CreateInterFace();

//注册消息框监听器

txtMSG.addActionListener(this);

btnSend.addActionListener(this);

try

{

//端口:9527

ds =new DatagramSocket(sendPort);

}

catch(Exception ex)

{

ex.printStackTrace();

}

//============接受消息============

//匿名类

new Thread(new Runnable()

{

public void run()

{

byte buf[] = new byte[1024];

//表示接受数据报包

while(true)

{

try

{

DatagramPacket dp = new DatagramPacket(buf,1024,InetAddress.getByName(txtIP.getText()),sendPort);

ds.receive(dp);

lst.add("【消息来自】◆" + dp.getAddress().getHostAddress() + "◆"+"【说】:" + new String (buf,0,dp.getLength()) /*+ dp.getPort()*/,0);

}

catch(Exception e)

{

if(ds.isClosed())

{

e.printStackTrace();

}

}

}

}

}).start();

//关闭窗体事件

this.addWindowListener(new WindowAdapter()

{

public void windowClosing(WindowEvent w)

{

System.out.println("test");

int n=JOptionPane.showConfirmDialog(null,"是否要退出?","退出",JOptionPane.YES_NO_OPTION);

if(n==JOptionPane.YES_OPTION)

{

dispose();

System.exit(0);

ds.close();//关闭ds对象//关闭数据报套接字

}

}

});

}

//界面设计布局

public void CreateInterFace()

{

this.add(lst,BorderLayout.CENTER);

this.add(p,BorderLayout.SOUTH);

p.add(lblIP);

p.add(txtIP);

p.add(lblMSG);

p.add(txtMSG);

p.add(btnSend);

txtIP.setText(sendIP);

//背景颜色

lst.setBackground(Color.yellow);

//JAVA默认风格

this.setUndecorated(true);

this.getRootPane().setWindowDecorationStyle(JRootPane.FRAME);

this.setSize(600,500);

this.setTitle("〓聊天室〓");

this.setResizable(false);//不能改变窗体大小

this.setLocationRelativeTo(null);//窗体居中

this.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);

this.setVisible(true);

txtMSG.requestFocus();//消息框得到焦点

}

//===============================Main函数===============================

public static void main(String[]args)

{

new Chat();

}

//================================发送消息===============================

//消息框回车发送消息事件

public void actionPerformed(ActionEvent e)

{

//得到文本内容

buf = txtMSG.getText().getBytes();

//判断消息框是否为空

if (txtMSG.getText().length()==0)

{

JOptionPane.showMessageDialog(null,"发送消息不能为空","提示",JOptionPane.WARNING_MESSAGE);

}

else{

try

{

InetAddress address = InetAddress.getByName(sendIP);

DatagramPacket dp = new DatagramPacket(buf,buf.length,InetAddress.getByName(txtIP.getText()),sendPort);

ds.send(dp);

}

catch(Exception ex)

{

ex.printStackTrace();

}

}

txtMSG.setText("");//清空消息框

//点发送按钮发送消息事件

if(e.getSource()==btnSend)

{

buf = txtMSG.getText().getBytes();

try

{

DatagramPacket dp = new DatagramPacket(buf,buf.length,InetAddress.getByName(txtIP.getText()),sendPort);

}

catch(Exception ex)

{

ex.printStackTrace();

}

txtMSG.setText("");//清空消息框

txtMSG.requestFocus();

}

}

}

java通讯录全部代码！

import java.io.BufferedOutputStream;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.FileReader;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.Scanner;

public class AddList {

private String filePath = "";

private String bakPath = "";

private String content = "";

Scanner sc = new Scanner(System.in);

public String readFile(){

content = "";

if (isNull(filePath)) {

System.out.println("文件存储路径：");

filePath = sc.nextLine();

}

File file = new File(filePath);

FileReader fr = null;

try {

if (file.exists()) {

fr = new FileReader(file);

char[] chars = new char[1024];

int n = 0;

while((n = fr.read(chars)) != -1){

String string = new String(chars, 0, n);

content = content + string;

}

} else {

System.out.println("文件不存在");

}

} catch (Exception e) {

e.printStackTrace();

} finally {

if (fr != null) {

try {

fr.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}

return content;

}

public void writeFile(String path){

File file = new File(path);

FileOutputStream fos = null;

mkDirs(path);

try {

fos = new FileOutputStream(file);

BufferedOutputStream bos = new BufferedOutputStream(fos);

PrintWriter pw = new PrintWriter(bos, true);

pw.print(content);

pw.flush();

} catch (FileNotFoundException e) {

e.printStackTrace();

} finally {

if (fos != null) {

try {

fos.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}

}

public void writeFile(){

if (isNull(filePath)) {

System.out.println("文件存储路径：");

filePath = sc.nextLine();

}

File file = new File(filePath);

FileOutputStream fos = null;

mkDirs(filePath);

try {

fos = new FileOutputStream(file);

BufferedOutputStream bos = new BufferedOutputStream(fos);

PrintWriter pw = new PrintWriter(bos, true);

pw.print(content);

pw.flush();

} catch (FileNotFoundException e) {

e.printStackTrace();

} finally {

if (fos != null) {

try {

fos.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}

}

public void mkDirs(String filepath){

if (filepath.indexOf("\\") != -1) {

filepath = filepath.replaceAll("\\", "/");

}

int n = filepath.indexOf("//");

String path = filepath.substring(0, n) + "//";

filepath = filepath.substring(filepath.indexOf("//") + 1, filepath.length());

String[] files = filepath.split("/");

for (int i = 0; i files.length - 1; i++) {

path = path + files[i];

File file = new File(path);

if (!file.exists()) {

file.mkdir();

}

}

}

public void addImfor(){

System.out.println("--------增加记录---------");

String name = "";

String tel = "";

String email = "";

content = readFile();

while(true){

System.out.println("姓名：");

name = sc.next();

System.out.println("电话：");

tel = sc.next();

System.out.println("Email：");

email = sc.next();

content = content + name + "" + tel + "" + email +"==";

System.out.println("0、Exit 1、继续");

int i = sc.nextInt();

if (i == 0) {

break;

}

}

writeFile();

}

public void deleteImfor(){

System.out.println("---------删除记录---------");

String name = "";

String[] imfors = null;

content = readFile();

while(true){

System.out.println("你要删除的姓名是：");

name = sc.next();

if (content.indexOf(name) != -1) {

imfors = content.split("==");

for (int i = 0; i imfors.length; i++) {

if (imfors[i].indexOf(name) != -1) {

imfors[i] = "";

}

}

JAVA通讯录 求一个JAVA编写的通讯录，基本的就可以。

具体方法如下：

1、定义封装一条记录的实体类

2、根据实际系统容量，定义一个数组

3、完成系统中显示全部记录的逻辑

4、完成系统中添加一条记录的逻辑

5、完成系统中删除一条记录的逻辑

6、完成系统中修改一条记录的逻辑

7、全部代码：

import java.util.Scanner;

class Contact {

String cellPhone;

String name;

}

public class Main {

private static void menu () {

System.out.println("************** 菜单 ******"

+ "************");

System.out.println(" 1.显示全部通讯录");

System.out.println(" 2.增加一条记录");

System.out.println(" 3.删除一条记录");

System.out.println(" 4.修改一条记录");

System.out.println(" 0.退出");

}

public static void main(String[] args) {

Scanner scn = new Scanner(System.in);

Contact[] contacts = new Contact[200];

int size = 0;

String cmd = "";

do {

menu();

System.out.print("请输入你得选择：(0-4)");

cmd = scn.nextLine();

if (cmd.equals("1")) {

if (size == 0)

System.out.println("系统当前无记录！");

else

for (int i = 0; i size; i++) {

System.out.println(contacts[i].name + ":"

+ contacts[i].cellPhone);

}

} else if (cmd.equals("2")) {

System.out.print("请输入手机号：");

String cellphone = scn.nextLine();

System.out.print("请输入姓名：");

String name = scn.nextLine();

Contact contact = new Contact();

contact.cellPhone = cellphone;

contact.name = name;

if (size contacts.length) {

contacts[size++] = contact;

System.out.println("添加成功！");

} else {

System.out.println("你最多只能添加" +

contacts.length + "条记录");

}

} else if (cmd.equals("3")) {

System.out.print("请输入要删除的手机号：");

String cellphone = scn.nextLine();

int index = -1;

for (int i = 0; i size i contacts.length;

i++) {

if (contacts[i].cellPhone.equals(cellphone)) {

index = i;

break;

}

}

if (index == -1) {

System.out.println("该记录不存在！");

} else {

for (int i = index; i size; i++) {

contacts[index] = contacts[index + 1];

}

contacts[size - 1] = null;

size--;

System.out.println("删除成功！");

}

} else if (cmd.equals("4")) {

System.out.print("请输入要修改的手机号：");

String cellphone = scn.nextLine();

int index = -1;

for (int i = 0; i size i contacts.length;

i++) {

if (contacts[i].cellPhone.equals(cellphone)) {

index = i;

break;

}

}

if (index == -1) {

System.out.println("该记录不存在！");

} else {

System.out.print("请输入姓名：");

String name = scn.nextLine();

contacts[index].name = name;

}

}

} while (!cmd.equals("0"));

System.out.println("退出成功！");

scn.close();

System.exit(0);

}

}

求java即时通讯的一个简单功能代码

20分！！！？？(⊙o⊙)

给你这个做参考吧。自己改一下就行了。（共两个文件）

//ChatClient.java

import java.awt.*;

import java.awt.event.*;

import java.io.*;

import java.net.*;

public class ChatClient extends Frame {

Socket s = null;

DataOutputStream dos = null;

DataInputStream dis = null;

private boolean bConnected = false;

TextField tfTxt = new TextField();

TextArea taContent = new TextArea();

Thread tRecv = new Thread(new RecvThread());

public static void main(String[] args) {

new ChatClient().launchFrame();

}

public void launchFrame() {

setLocation(400, 300);

this.setSize(300, 300);

add(tfTxt, BorderLayout.SOUTH);

add(taContent, BorderLayout.NORTH);

pack();

this.addWindowListener(new WindowAdapter() {

@Override

public void windowClosing(WindowEvent arg0) {

disconnect();

System.exit(0);

}

});

tfTxt.addActionListener(new TFListener());

setVisible(true);

connect();

tRecv.start();

}

public void connect() {

try {

s = new Socket("127.0.0.1", 8888);

dos = new DataOutputStream(s.getOutputStream());

dis = new DataInputStream(s.getInputStream());

System.out.println("connected!");

bConnected = true;

} catch (UnknownHostException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

public void disconnect() {

try {

dos.close();

dis.close();

s.close();

} catch (IOException e) {

e.printStackTrace();

}

/*

try {

bConnected = false;

tRecv.join();

} catch(InterruptedException e) {

e.printStackTrace();

} finally {

try {

dos.close();

dis.close();

s.close();

} catch (IOException e) {

e.printStackTrace();

}

}

*/

}

private class TFListener implements ActionListener {

public void actionPerformed(ActionEvent e) {

String str = tfTxt.getText().trim();

//taContent.setText(str);

tfTxt.setText("");

try {

//System.out.println(s);

dos.writeUTF(str);

dos.flush();

//dos.close();

} catch (IOException e1) {

e1.printStackTrace();

}

}

}

private class RecvThread implements Runnable {

public void run() {

try {

while(bConnected) {

String str = dis.readUTF();

//System.out.println(str);

taContent.setText(taContent.getText() + str + '\n');

}

} catch (SocketException e) {

System.out.println("退出了，bye!");

} catch (EOFException e) {

System.out.println("推出了，bye - bye!");

} catch (IOException e) {

e.printStackTrace();

}

}

}

}

//ChatServer.java

import java.io.*;

import java.net.*;

import java.util.*;

public class ChatServer {

boolean started = false;

ServerSocket ss = null;

ListClient clients = new ArrayListClient();

public static void main(String[] args) {

new ChatServer().start();

}

public void start() {

try {

ss = new ServerSocket(8888);

started = true;

} catch (BindException e) {

System.out.println("端口使用中....");

System.out.println("请关掉相关程序并重新运行服务器！");

System.exit(0);

} catch (IOException e) {

e.printStackTrace();

}

try {

while(started) {

Socket s = ss.accept();

Client c = new Client(s);

System.out.println("a client connected!");

new Thread(c).start();

clients.add(c);

//dis.close();

}

} catch (IOException e) {

e.printStackTrace();

} finally {

try {

ss.close();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

class Client implements Runnable {

private Socket s;

private DataInputStream dis = null;

private DataOutputStream dos = null;

private boolean bConnected = false;

public Client(Socket s) {

this.s = s;

try {

dis = new DataInputStream(s.getInputStream());

dos = new DataOutputStream(s.getOutputStream());

bConnected = true;

} catch (IOException e) {

e.printStackTrace();

}

}

public void send(String str) {

try {

dos.writeUTF(str);

} catch (IOException e) {

clients.remove(this);

System.out.println("对方退出了！我从List里面去掉了！");

//e.printStackTrace();

}

}

public void run() {

try {

while(bConnected) {

String str = dis.readUTF();

System.out.println(str);

for(int i=0; iclients.size(); i++) {

Client c = clients.get(i);

c.send(str);

//System.out.println(" a string send !");

}

/*

for(IteratorClient it = clients.iterator(); it.hasNext(); ) {

Client c = it.next();

c.send(str);

}

*/

/*

IteratorClient it = clients.iterator();

while(it.hasNext()) {

Client c = it.next();

c.send(str);

}

*/

}

} catch (EOFException e) {

System.out.println("Client closed!");

} catch (IOException e) {

e.printStackTrace();

} finally {

try {

if(dis != null) dis.close();

if(dos != null) dos.close();

if(s != null) {

s.close();

//s = null;

}

} catch (IOException e1) {

e1.printStackTrace();

}

}

}

}

}

java实现串口通信代码

public static void process() {

try {

Enumeration portList = CommPortIdentifier.getPortIdentifiers();

while (portList.hasMoreElements())

{

CommPortIdentifier portId = (CommPortIdentifier) portList.nextElement();

if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL)//如果端口类型是串口则判断名称

{

if(portId.getName().equals("COM1")){//如果是COM1端口则退出循环

break;

}else{

portId=null;

}

}

}

SerialPort serialPort = (SerialPort)portId.open("Serial_Communication", 1000);//打开串口的超时时间为1000ms

serialPort.setSerialPortParams(9600,SerialPort.DATABITS_8,SerialPort.STOPBITS_1,SerialPort.PARITY_NONE);//设置串口速率为9600，数据位8位，停止位1们，奇偶校验无

InputStream in = serialPort.getInputStream();//得到输入流

OutputStream out = serialPort.getOutputStream();//得到输出流

//进行输入输出操作

//操作结束后

in.close();

out.close();

serialPort.close();//关闭串口

} catch (PortInUseException e) {

e.printStackTrace();

} catch (UnsupportedCommOperationException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

Java语言写段简单，但又有技术含量的即时通讯代码，不胜感激之情溢于满天下

这里有一个简单的模拟通讯 要先运行服务器端 再运行客户端 否则会报错：

服务器端代码：

package com.test3;

import java.net.*;

import java.io.*;

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

public class Server2 extends JFrame implements ActionListener , KeyListener {

JTextArea jta=null;

JScrollPane jsp=null;

JTextField jtf=null;

JButton jb=null;

JPanel jp=null;

InputStreamReader isr=null;

BufferedReader br=null;

PrintWriter pw=null;

Socket s;

String jtatext="";

public static void main(String[] args) {

// TODO Auto-generated method stub

Server2 sv2=new Server2();

}

public Server2(){

jta=new JTextArea();

jta.setEditable(false);

jsp=new JScrollPane(jta);

jtf=new JTextField(10);

jtf.addKeyListener(this);

jb=new JButton("发送");

jb.addActionListener(this);

jp=new JPanel();

jp.add(jtf);

jp.add(jb);

this.add(jsp,"Center");

this.add(jp,"South");

this.setSize(300,300);

this.setLocationRelativeTo(this);

this.setTitle("服务器端");

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

this.setVisible(true);

try{

ServerSocket ss=new ServerSocket(9999);

s=ss.accept();

isr=new InputStreamReader(s.getInputStream());

br=new BufferedReader(isr);

pw=new PrintWriter(s.getOutputStream(),true);

while(true){

String info=br.readLine();

jta.append("客户端对服务器说：   "+info+"\r\n");

// this.jta.setText(jtatext);

}

}catch(Exception e){

e.printStackTrace();

}

}

@Override

public void actionPerformed(ActionEvent e) {

if(e.getSource()==jb){

try {

pw.println(jtf.getText());

jta.append("服务器对客户端说：   "+jtf.getText()+"\r\n");

// jta.setText(jtatext);

jtf.setText("");

} catch (Exception e1) {

// TODO Auto-generated catch block

e1.printStackTrace();

}

}

}

@Override

public void keyTyped(KeyEvent e) {}

@Override

public void keyPressed(KeyEvent e) {

if(e.getKeyCode()==KeyEvent.VK_ENTER){

try {

pw.println(jtf.getText());

jta.append("服务器对客户端说：   "+jtf.getText()+"\r\n");

jtf.setText("");

} catch (Exception e1) {

e1.printStackTrace();

}

}

}

@Override

public void keyReleased(KeyEvent e) {}

}

客户端代码：

package com.test3;

import java.net.*;

import java.io.*;

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

public class Client2 extends JFrame implements ActionListener ,KeyListener {

JTextArea jta=null;

JScrollPane jsp=null;

JTextField jtf=null;

JButton jb=null;

JPanel jp=null;

String jtatext="";

Socket s;

PrintWriter pw=null;

InputStreamReader isr=null;

BufferedReader br=null;

public static void main(String[] args) {

// TODO Auto-generated method stub

Client2 sv2=new Client2();

}

public Client2(){

jta=new JTextArea();

jta.setEditable(false);

jsp=new JScrollPane(jta);

jtf=new JTextField(10);

jtf.addKeyListener(this);

jb=new JButton("发送");

jb.addActionListener(this);

jp=new JPanel();

jp.add(jtf);

jp.add(jb);

this.add(jsp,"Center");

this.add(jp,"South");

this.setSize(300,300);

this.setLocationRelativeTo(this);

this.setTitle("客户端");

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

this.setVisible(true);

try {

 s=new Socket("127.3.3.3",9999);

 isr=new InputStreamReader(s.getInputStream());

 br=new BufferedReader(isr);

 pw=new PrintWriter(s.getOutputStream(),true);

 

 while(true){

 String info=br.readLine(); 

jta.append("服务器对客户端说：   "+info+"\r\n");

 

 }

} catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

@Override

public void actionPerformed(ActionEvent e) {

if(e.getSource()==jb){

try {

pw.println(this.jtf.getText());

jta.append("客户端对服务器说：   "+jtf.getText()+"\r\n");

jtf.setText("");

} catch (Exception e1) {

// TODO Auto-generated catch block

e1.printStackTrace();

}

}

}

public void keyTyped(KeyEvent e) {}

public void keyPressed(KeyEvent e) {

if(e.getKeyCode()==KeyEvent.VK_ENTER){

try {

pw.println(this.jtf.getText());

jta.append("客户端对服务器说：   "+jtf.getText()+"\r\n");

jtf.setText("");

} catch (Exception e1) {

// TODO Auto-generated catch block

e1.printStackTrace();

}

}

}

public void keyReleased(KeyEvent e) {}

}

文章名称：java简单通讯代码,Java通信
标题链接：http://myzitong.com/article/hdheoc.html