目錄

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基本概念

代碼與實例

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基本概念

這里采用的是TCP模型，只說明一點，在Java中有

import java.net.Socket;

這個包中TCP的用法個人覺得和QTcpSocket差不多（個人覺得QTcpSocket好用點，可能是自己習慣問題）

這里用控制臺輸入，輸出可以采用這樣的方式！

首先構造一個輸入流：

InputStream in = System.in; BufferedReader input = new BufferedReader(new InputStreamReader(in));

得到socket的輸入流

InputStream inputStream = client.getInputStream(); BufferedReader socketBufferedReader = new BufferedReader(new InputStreamReader(inputStream));

然后從鍵盤輸入就可以直接發送了！

String str = input.readLine(); socketPrintStream.println(str);

這樣的話，就要從鍵盤輸入，然后再發送了！

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代碼與實例

程序運行截圖如下

服務器端：

客戶端：

源碼如下：

Client.java

import java.io.*; import java.net.Inet4Address; import java.net.InetSocketAddress; import java.net.Socket;public class Client {public static void main(String[] args) throws IOException{Socket socket = new Socket();socket.setSoTimeout(3000);//連接本地， 端口 2000， 超時時間3000mssocket.connect(new InetSocketAddress(Inet4Address.getLocalHost(), 2000), 3000);System.out.println("已發起服務器連接，并進入后續流程！");System.out.println("客戶端信息：" + socket.getLocalAddress() + " p：" + socket.getLocalPort());System.out.println("服務器信息：" + socket.getInetAddress() + " p：" + socket.getPort());try{todo(socket);}catch (Exception e){System.out.println("異常關閉");}//釋放資源socket.close();System.out.println("客戶端已退出！");}private static void todo(Socket client) throws IOException{//得到socket輸出流，并轉換為打印流OutputStream outputStream = client.getOutputStream();PrintStream socketPrintStream = new PrintStream(outputStream);//構建鍵盤輸入流InputStream inputStream = client.getInputStream();InputStream in = System.in;BufferedReader input = new BufferedReader(new InputStreamReader(in));BufferedReader socketBufferedReader = new BufferedReader(new InputStreamReader(inputStream));boolean flag = true;do{//鍵盤讀取一行String str = input.readLine();//發送到服務器socketPrintStream.println(str);//從服務器讀取一行String echo = socketBufferedReader.readLine();if("bye".equalsIgnoreCase(echo)){flag = false;}else{System.out.println(echo);}}while (flag);//資源釋放socketPrintStream.close();socketBufferedReader.close();} }

Server.java

import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.io.PrintStream; import java.net.ServerSocket; import java.net.Socket;public class Server {public static void main(String[] args) throws IOException{ServerSocket server = new ServerSocket(2000);System.out.println("服務器準備就緒！");System.out.println("服務器信息：" + server.getInetAddress() + " P：" + server.getLocalPort());//等待服務器連接server.accept();for(;;){//得到客戶端Socket client = server.accept();//客戶端構建異步線程ClientHandler clientHandler = new ClientHandler(client);//啟動線程clientHandler.start();}}private static class ClientHandler extends Thread{private Socket socket;private boolean flag = true;ClientHandler(Socket socket){this.socket = socket;}@Overridepublic void run() {super.run();System.out.println("新客戶端連接：" + socket.getInetAddress() + " P：" + socket.getPort());try{//得到打印流，用于數據輸出；服務器會送數據使用PrintStream socketOutput = new PrintStream(socket.getOutputStream());//得到輸入流，用于接收數據BufferedReader socketInput = new BufferedReader(new InputStreamReader(socket.getInputStream()));do{//客戶端拿到一條數據String str = socketInput.readLine();if("bye".equalsIgnoreCase(str)){flag = false;//回送socketOutput.println("bye");}else{//打印到屏幕，并回送數據長度System.out.println(str);socketOutput.println("回送：" + str.length());}}while (flag);socketInput.close();socketOutput.close();}catch (Exception e){System.out.println("連接異常斷開！");}finally {//關閉連接try{socket.close();} catch (IOException e) {e.printStackTrace();}}System.out.println("客戶端已退出：" + socket.getInetAddress() + " P：" + socket.getPort());}} }

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