伺服器端（Server）非多執行緒

package com.zeph.serverclient;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

public class MyServer {
	public static void main(String[] args) throws IOException {
		ServerSocket server = new ServerSocket(5678);
		Socket client = server.accept();
		BufferedReader in = new BufferedReader(new InputStreamReader(
				client.getInputStream()));
		PrintWriter out = new PrintWriter(client.getOutputStream());
		while (true) {
			String str = in.readLine();
			System.out.println(str);
			out.println("has receive....");
			out.flush();
			if (str.equals("end"))
				break;
		}
		client.close();
	}
}
 

package com.zeph.serverclient;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.Socket;

public class MyClient {
	static Socket server;

	public static void main(String[] args) throws Exception {
		server = new Socket(InetAddress.getLocalHost(), 5678);
		BufferedReader in = new BufferedReader(new InputStreamReader(
				server.getInputStream()));
		PrintWriter out = new PrintWriter(server.getOutputStream());
		BufferedReader wt = new BufferedReader(new InputStreamReader(System.in));
		while (true) {
			String str = wt.readLine();
			out.println(str);
			out.flush();
			if (str.equals("end")) {
				break;
			}
			System.out.println(in.readLine());
		}
		server.close();
	}
}
 

伺服器端（Server）多執行緒

package com.zeph.multiclient;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

public class MultiClient extends Thread {
	private Socket client;

	public MultiClient(Socket c) {
		this.client = c;
	}

	public void run() {
		try {
			BufferedReader in = new BufferedReader(new InputStreamReader(
					client.getInputStream()));
			PrintWriter out = new PrintWriter(client.getOutputStream());
			// Mutil User but can't parallel

			while (true) {
				String str = in.readLine();
				System.out.println(str);
				out.println("has receive....");
				out.flush();
				if (str.equals("end"))
					break;
			}
			client.close();
		} catch (IOException ex) {
		} finally {
		}
	}

	public static void main(String[] args) throws IOException {
		ServerSocket server = new ServerSocket(5678);
		while (true) {
			// transfer location change Single User or Multi User

			MultiClient mc = new MultiClient(server.accept());
			mc.start();
		}
	}
}
 

測試這個程式碼的時候可以直接用DOS控制檯上面執行，這樣看的效果更清楚！

伺服器基本步驟：

1.指定埠例項化一個SeverSocket

2.呼叫ServerSocket的accept()方法，以在等待連線期間造成阻塞

3.獲取位於該底層的Socket的流以進行讀寫操作

4.將資料封裝成流

5.對Socket進行讀寫

6.關閉開啟的流

客戶端基本步驟：

1.通過IP地址和埠例項化Socket，請求連線伺服器

2.獲得Socket上的流以進行讀寫

3.把流封裝進BufferedReader/PrintWriter的例項

4.對Socket進行讀寫

5.關閉開啟的流