java.txt

简单的聊天。。客户端跟服务器

【ClientSocketDemo.java 客户端Java源代码】 

import java.net.*; 
import java.io.*; 
public class ClientSocketDemo 
{ 
//声明客户端Socket对象socket 
Socket socket = null; 

//声明客户器端数据输入输出流 
DataInputStream in; 
DataOutputStream out; 

//声明字符串数组对象response，用于存储从服务器接收到的信息 
String response[]; 

//执行过程中，没有参数时的构造方法，本地服务器在本地，取默认端口10745 
public ClientSocketDemo() 
{ 
try 
{ 
//创建客户端socket，服务器地址取本地，端口号为10745 
socket = new Socket("localhost",10745); 

//创建客户端数据输入输出流，用于对服务器端发送或接收数据 
in = new DataInputStream(socket.getInputStream()); 
out = new DataOutputStream(socket.getOutputStream()); 

//获取客户端地址及端口号 
String ip = String.valueOf(socket.getLocalAddress()); 
String port = String.valueOf(socket.getLocalPort()); 

//向服务器发送数据 
out.writeUTF("Hello Server.This connection is from client."); 
out.writeUTF(ip); 
out.writeUTF(port); 

//从服务器接收数据 
response = new String[3]; 
for (int i = 0; i < response.length; i++) 
{ 
response[i] = in.readUTF(); 
System.out.println(response[i]); 
} 
} 
catch(UnknownHostException e){e.printStackTrace();} 
catch(IOException e){e.printStackTrace();} 
} 

//执行过程中，有一个参数时的构造方法，参数指定服务器地址，取默认端口10745 
public ClientSocketDemo(String hostname) 
{ 
try 
{ 
//创建客户端socket，hostname参数指定服务器地址，端口号为10745 
socket = new Socket(hostname,10745); 
in = new DataInputStream(socket.getInputStream()); 
out = new DataOutputStream(socket.getOutputStream()); 

String ip = String.valueOf(socket.getLocalAddress()); 
String port = String.valueOf(socket.getLocalPort()); 

out.writeUTF("Hello Server.This connection is from client."); 
out.writeUTF(ip); 
out.writeUTF(port); 

response = new String[3]; 
for (int i = 0; i < response.length; i++) 
{ 
response[i] = in.readUTF(); 
System.out.println(response[i]); 
} 
} 
catch(UnknownHostException e){e.printStackTrace();} 
catch(IOException e){e.printStackTrace();} 
} 

//执行过程中，有两个个参数时的构造方法，第一个参数hostname指定服务器地址 
//第一个参数serverPort指定服务器端口号 
public ClientSocketDemo(String hostname,String serverPort) 
{ 
try 
{ 
socket = new Socket(hostname,Integer.parseInt(serverPort)); 
in = new DataInputStream(socket.getInputStream()); 
out = new DataOutputStream(socket.getOutputStream()); 

String ip = String.valueOf(socket.getLocalAddress()); 
String port = String.valueOf(socket.getLocalPort()); 

out.writeUTF("Hello Server.This connection is from client."); 
out.writeUTF(ip); 
out.writeUTF(port); 

response = new String[3]; 
for (int i = 0; i < response.length; i++) 
{ 
response[i] = in.readUTF(); 
System.out.println(response[i]); 
} 
} 
catch(UnknownHostException e){e.printStackTrace();} 
catch(IOException e){e.printStackTrace();} 
} 

public static void main(String[] args) 
{ 
String comd[] = args; 
if(comd.length == 0) 
{ 
System.out.println("Use localhost(127.0.0.1) and default port"); 
ClientSocketDemo demo = new ClientSocketDemo(); 
} 
else if(comd.length == 1) 
{ 
System.out.println("Use default port"); 
ClientSocketDemo demo = new ClientSocketDemo(args[0]); 
} 
else if(comd.length == 2) 
{ 
System.out.println("Hostname and port are named by user"); 
ClientSocketDemo demo = new ClientSocketDemo(args[0],args[1]); 
} 
else System.out.println("ERROR"); 
} 
} 
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// 

【ServerSocketDemo.java 服务器端Java源代码】 

import java.net.*; 
import java.io.*; 
public class ServerSocketDemo 
{ 
//声明ServerSocket类对象 
ServerSocket serverSocket; 

//声明并初始化服务器端监听端口号常量 
public static final int PORT = 10745; 

//声明服务器端数据输入输出流 
DataInputStream in; 
DataOutputStream out; 

//声明InetAddress类对象ip，用于获取服务器地址及端口号等信息 
InetAddress ip = null; 

//声明字符串数组对象request，用于存储从客户端发送来的信息 
String request[]; 

public ServerSocketDemo() 
{ 
request = new String[3]; //初始化字符串数组 
try 
{ 
//获取本地服务器地址信息 
ip = InetAddress.getLocalHost(); 

//以PORT为服务端口号，创建serverSocket对象以监听该端口上的连接 
serverSocket = new ServerSocket(PORT); 

//创建Socket类的对象socket，用于保存连接到服务器的客户端socket对象 
Socket socket = serverSocket.accept(); 
System.out.println("This is server:"+String.valueOf(ip)+PORT); 

//创建服务器端数据输入输出流，用于对客户端接收或发送数据 
in = new DataInputStream(socket.getInputStream()); 
out = new DataOutputStream(socket.getOutputStream()); 

//接收客户端发送来的数据信息，并显示 
request[0] = in.readUTF(); 
request[1] = in.readUTF(); 
request[2] = in.readUTF(); 
System.out.println("Received messages form client is:"); 
System.out.println(request[0]); 
System.out.println(request[1]); 
System.out.println(request[2]); 

//向客户端发送数据 
out.writeUTF("Hello client!"); 
out.writeUTF("Your ip is:"+request[1]); 
out.writeUTF("Your port is:"+request[2]); 
} 
catch(IOException e){e.printStackTrace();} 
} 
public static void main(String[] args) 
{ 
ServerSocketDemo demo = new ServerSocketDemo(); 
} 
}