javanewsocket

1. 速求用java語言寫聊天室的源代碼

【ClientSocketDemo.java 客戶端Java源代碼】

import java.net.*;
import java.io.*;
public class ClientSocketDemo
{
//聲明客戶端Socket對象socket
Socket socket = null;

//聲明客戶器端數據輸入輸出流
DataInputStream in;
DataOutputStream out;

//聲明字元串數組對象response，用於存儲從伺服器接收到的信息
String response[];

//執行過程中，沒有參數時的構造方法，本地伺服器在本地，取默認埠10745
public ClientSocketDemo()
{
try
{
//創建客戶端socket，伺服器地址取本地，埠號為10745
socket = new Socket("localhost",10745);

//創建客戶端數據輸入輸出流，用於對伺服器端發送或接收數據
in = new DataInputStream(socket.getInputStream());
out = new DataOutputStream(socket.getOutputStream());

//獲取客戶端地址及埠號
String ip = String.valueOf(socket.getLocalAddress());
String port = String.valueOf(socket.getLocalPort());

//向伺服器發送數據
out.writeUTF("Hello Server.This connection is from client.");
out.writeUTF(ip);
out.writeUTF(port);

//從伺服器接收數據
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();}
}

//執行過程中，有一個參數時的構造方法，參數指定伺服器地址，取默認埠10745
public ClientSocketDemo(String hostname)
{
try
{
//創建客戶端socket，hostname參數指定伺服器地址，埠號為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();}
}

//執行過程中，有兩個個參數時的構造方法，第一個參數hostname指定伺服器地址
//第一個參數serverPort指定伺服器埠號
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 伺服器端Java源代碼】

import java.net.*;
import java.io.*;
public class ServerSocketDemo
{
//聲明ServerSocket類對象
ServerSocket serverSocket;

//聲明並初始化伺服器端監聽埠號常量
public static final int PORT = 10745;

//聲明伺服器端數據輸入輸出流
DataInputStream in;
DataOutputStream out;

//聲明InetAddress類對象ip，用於獲取伺服器地址及埠號等信息
InetAddress ip = null;

//聲明字元串數組對象request，用於存儲從客戶端發送來的信息
String request[];

public ServerSocketDemo()
{
request = new String[3]; //初始化字元串數組
try
{
//獲取本地伺服器地址信息
ip = InetAddress.getLocalHost();

//以PORT為服務埠號，創建serverSocket對象以監聽該埠上的連接
serverSocket = new ServerSocket(PORT);

//創建Socket類的對象socket，用於保存連接到伺服器的客戶端socket對象
Socket socket = serverSocket.accept();
System.out.println("This is server:"+String.valueOf(ip)+PORT);

//創建伺服器端數據輸入輸出流，用於對客戶端接收或發送數據
in = new DataInputStream(socket.getInputStream());
out = new DataOutputStream(socket.getOutputStream());

//接收客戶端發送來的數據信息，並顯示
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]);

//向客戶端發送數據
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();
}
}

2. java socket發送字元串

java中socket是向某個特定地址的埠發送流（字元串通過getBytes方法轉換成流）。

publicstaticvoidmain(String[]args){
Sockets;
try{
s=newSocket("localhost",9091);

DataOutputStreamout=newDataOutputStream(s.getOutputStream());
out.write("aslkjlksjdsad".getBytes());
out.flush();
out.close();
}catch(UnknownHostExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}catch(IOExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
}

備註：有發送的話，就需要相應的地址和埠上做一個接收的，來實現交互。

3. java中的socket客戶端的埠如何綁定

java中的socket客戶端只需用伺服器所在機器的ip以及伺服器的埠作為參數創建一個Socket對象就可以了,客戶端的代碼可以看下實例：
Socket socket = new Socket("168.160.12.42",9998);
或：
Socket socket = new Socket(InetAddress.getLocalHost(),5678); // 向主機名為InetAddress.getLocalHost()的伺服器申請連接

客戶機必須知道有關伺服器的IP地址，對於著一點Java也提供了一個相關的類InetAddress 該對象的實例必須通過它的靜態方法來提供，它的靜態方法主要提供了得到本機IP 和通過名字或IP直接得到InetAddress的方法。

in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
out = new PrintWriter(socket.getOutputStream(),true);

以上的程序代碼建立了一個Socket對象，這個對象連接到ip地址為168.160.12.42的主機上、埠為9998的伺服器對象。並且建立了輸入流和輸出流，分別對應伺服器的輸出和客戶端的寫入。