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：

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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) {}

}

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);

}

}

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();

}

}

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