Java–實現(同局域網)簡單聊天案例
（代碼如下，需要練習請自取）
注：下列都需要在idea中完成，客戶端和服務端都要運行才可鏈接一者斷開兩者程序都結束運行

單線程

只能實現一個客戶端連接

客戶端

import java.io.BufferedReader; import java.io.InputStreamReader; import java.io.PrintWriter; import java.net.Socket; import java.net.SocketException; import java.util.Scanner;public class Client {public static void main(String[] args) {//客戶端try{Socket c = new Socket("127.0.0.1",6666);//此處ip地址為客戶端ip//“6666”為服務端設置的口令相當于密碼PrintWriter out = new PrintWriter(c.getOutputStream()); //發信息BufferedReader br = new BufferedReader(new InputStreamReader(c.getInputStream())); //接信息while(true) {//發信息System.out.println("發信息：");String msg = new Scanner(System.in).nextLine() + "\r\n";out.write(msg);out.flush();//先收信息String info = br.readLine();System.out.println(info);}}catch(Exception e){e.printStackTrace();}} }

服務端

import java.io.BufferedReader; import java.io.InputStreamReader; import java.io.PrintWriter; import java.net.ServerSocket; import java.net.Socket; import java.util.Scanner;public class Server {public static void main(String[] args) {//List<Socket> lists = new ArrayList<>();//服務器try {//System.out.println(InetAddress.getLocalHost().getHostAddress());ServerSocket server = new ServerSocket(6666);//“6666”設置口令相當于密碼Socket c = server.accept();System.out.println("有人上線");PrintWriter out = new PrintWriter(c.getOutputStream()); //發信息BufferedReader br = new BufferedReader(new InputStreamReader(c.getInputStream())); //接信息while (true) {//先收信息String msg = br.readLine();System.out.println(msg);//發信息System.out.println("發信息：");String info = new Scanner(System.in).nextLine() + "\r\n";out.write(info);out.flush();}//while(true) {// Socket c = server.accept();//中斷// lists.add(c);// System.out.println("有人連線");//}} catch (Exception e) {e.printStackTrace();}} }

多線程

能實現多個客戶端連接服務端

服務端

服務端的實現方法

import java.io.BufferedInputStream; import java.io.BufferedReader; import java.io.PrintWriter; import java.util.Scanner;public class ChatUtil {private PrintWriter writer;private BufferedReader reader;private String title;public ChatUtil(PrintWriter writer, BufferedReader reader, String title) {this.writer = writer;this.reader = reader;this.title = title;}/*** 發信息*/public void a() {while (true) {//發信息String info = title + ":" + new Scanner(System.in).nextLine() + "\r\n";writer.write(info);writer.flush();}}public void b() {while (true) {try {//先收信息String msg = reader.readLine();//System.out.println(msg);} catch (Exception e) {e.printStackTrace();}}}public PrintWriter getWriter() {return writer;}public void setWriter(PrintWriter writer) {this.writer = writer;}public BufferedReader getReader() {return reader;}public void setReader(BufferedReader reader) {this.reader = reader;}public String getTitle() {return title;}public void setTitle(String title) {this.title = title;}}

服務端的執行程序

import java.io.BufferedInputStream; import java.io.BufferedReader; import java.io.InputStreamReader; import java.io.PrintWriter; import java.net.ServerSocket; import java.net.Socket;public class Server {public static void main(String[] args) {try {ServerSocket server = new ServerSocket(6666);Socket c = server.accept();PrintWriter writer = new PrintWriter(c.getOutputStream());BufferedReader reader = new BufferedReader(new InputStreamReader(c.getInputStream()));ChatUtil cu = new ChatUtil(writer,reader,"服務器");new Thread(cu::a).start();new Thread(cu::b).start();}catch (Exception e) {e.printStackTrace();}} }

客戶端

import java.io.BufferedReader; import java.io.InputStreamReader; import java.io.PrintWriter; import java.net.Socket;public class Client {public static void main(String[] args) {try{Socket c = new Socket("127.0.0.1",6666);PrintWriter writer = new PrintWriter(c.getOutputStream());BufferedReader reader = new BufferedReader(new InputStreamReader(c.getInputStream()));ChatUtil cu = new ChatUtil(writer,reader,"客戶");new Thread(cu::a).start();new Thread(cu::b).start();}catch(Exception e){e.printStackTrace();}} }

總結

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