利用Java编写聊天程序，供大家参考，具体内容如下
首先计算机网络有两种传输层协议：TCP（面向连接）,UDP（面向无连接）。今天就介绍基于这两种协议的聊天程序。
先查明自己电脑的主机名
右键我的电脑-->属性
1.基于UDP的发送端
package cn.com;
/**
* 基于UDP
* 聊天发送端
*/
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.util.Scanner;
public class Send {
public static void main(String[] args) throws IOException {
@SuppressWarnings("resource")
DatagramSocket ds = new DatagramSocket();
Scanner sc = new Scanner(System.in);
String line = null;
while ((line = sc.nextLine()) != null) {
byte[] buf = line.getBytes();
int length = buf.length;
InetAddress address = InetAddress.getByName("1-PC21");//主机名
DatagramPacket dp = new DatagramPacket(buf, length, address, 10086); //10086为自己设置的端口号
ds.send(dp);
}
sc.close();
}
}2.基于UDP的接收端
package cn.com;
/**
* 基于UDP
* 聊天接收端
*/
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
public class Receive {
public static void main(String[] args) throws IOException {
@SuppressWarnings("resource")
DatagramSocket ds = new DatagramSocket(10086);//端口号需一致
while (true) {
byte[] b = new byte[1024 * 1];
int length = b.length;
DatagramPacket dp = new DatagramPacket(b, length);
ds.receive(dp);
byte[] data = dp.getData();
int length2 = dp.getLength();
String hostAddress = dp.getAddress().getHostAddress();
String s = new String(data, 0, length2);
System.out.println(s + "来自" + hostAddress);
}
}
}3.先运行接收端，在运行发送端
发送端发送“Hello World”，“My name is Tom”。
接收端收到信息
1.客户端
package cn.com;
/**
* 基于TCP
* 聊天系统客户端
*/
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.Socket;
import java.util.Scanner;
public class Client {
public static void main(String[] args) throws IOException {
InetAddress address = InetAddress.getByName("1-PC21");//主机名
int port = 10089;
Scanner sc = new Scanner(System.in);
String line = null;
while ((line = sc.nextLine()) != null) {
@SuppressWarnings("resource")
Socket socket = new Socket(address, port); //socket要在循环体中定义
OutputStream os = socket.getOutputStream();
os.write(line.getBytes());
// 客户端接收服务端返回的消息(输入流)
InputStream is = socket.getInputStream();
byte[] b = new byte[1024 * 1];
int len = is.read(b);
String s = new String(b, 0, len);
System.out.println(s);
}
sc.close();
}
}2.服务端
package cn.com;
/**
* 基于TCP
* 聊天系统服务端
*/
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
public class Server {
public static void main(String[] args) throws IOException {
@SuppressWarnings("resource")
ServerSocket ss = new ServerSocket(10089);
while (true) {
Socket accept = ss.accept(); //循环中用到accept，所以要在循环中新建定义
InputStream is = accept.getInputStream();
byte[] b = new byte[1024 * 1];
int len = is.read(b);
String s = new String(b, 0, len);
System.out.println("已接收客户端内容-->" + s);
// 给客户端返回数据
OutputStream os = accept.getOutputStream();
String content = "客户端接收成功";
os.write(content.getBytes());
os.close();
is.close();
accept.close();
}
}
}3.还是先打开服务端，再打开客户端，发送信息
客户端发送：“今天星期四”，“天气很好” 两条信息。
服务端收到信息：
