Java中怎么利用TCP實現一個在線聊天功能

Java中怎么利用TCP實現一個在線聊天功能，相信很多沒有經驗的人對此束手無策，為此本文總結了問題出現的原因和解決方法，通過這篇文章希望你能解決這個問題。

客戶端的代碼：

package tcp.http;import java.io.*;import java.net.*;import java.util.Scanner;public class Client{public static void main(String[] args) throws IOException{Scanner scanner=new Scanner(System.in);//1.創建SocketSocket tcpClientSocket=new Socket();//2.TCP要發送消息，必須先建立連接byte[] IPv4={127,0,0,1};  //連接到本機InetAddress serverAddress=InetAddress.getByAddress(IPv4);SocketAddress serverSocketAddress=new InetSocketAddress(serverAddress,7777);tcpClientSocket.connect(serverSocketAddress);//連接上了，（連接過程代碼比較長，但是沒有什么復雜的，只需要查文檔根據函數的構造過程，一步步來寫就好了）while(true){ //寫個死循環來聊天String request=scanner.nextLine();//通過字節流寫入請求OutputStream os=tcpClientSocket.getOutputStream();//通過打印流打印和寫入PrintStream out=new PrintStream(os,true,"UTF-8");out.println(request);//通過字節流讀取響應InputStream is=tcpClientSocket.getInputStream();BufferedReader reader=new BufferedReader(new InputStreamReader(is,"UTF-8")); //通過readLine()來保證每次都能把一句完整的話讀完（\r\n是標志）;String response=reader.readLine();System.out.println("      "+response);}//tcpClientSocket.close();}}

服務器端的代碼：

package tcp.threads;import java.io.*;import java.net.*;import java.util.Scanner;import java.util.concurrent.*;public class Server{private static class TalkRunnable implements Runnable{ //一個個的工作線程private Socket clientSocket;TalkRunnable(Socket socket){this.clientSocket=socket;}@Overridepublic void run(){try{InetAddress clientAddress=clientSocket.getInetAddress();int clientPort=clientSocket.getPort();System.out.printf("ID為 %s:%d 的好友上線了%n",clientAddress.getHostAddress(),clientPort);//獲取字節流InputStream is=null;is=clientSocket.getInputStream();//字節流轉換為字符流InputStreamReader isReader=null;isReader=new InputStreamReader(is,"UTF-8");//獲取輸出字節流OutputStream os=clientSocket.getOutputStream();//獲取打印流PrintStream out=new PrintStream(os,true,"UTF-8");//獲取緩沖字符流BufferedReader reader=new BufferedReader(isReader);while(true){ //死循環聊天String line=reader.readLine();System.out.println("      好友說："+line);Scanner scanner=new Scanner(System.in);String response=scanner.nextLine();out.println(response);}}catch(IOException e){e.printStackTrace();}}}public static void main(String[] args) throws IOException{//監聽連接ServerSocket tcpServerSocket=new ServerSocket(7777);//定義阻塞隊列BlockingQueue<Runnable> queue=new LinkedBlockingQueue<>();//創建線程池ExecutorService pool=new ThreadPoolExecutor(100,100,0,TimeUnit.MILLISECONDS,queue);while(true){//TCP 要發送消息必須先建立連接Socket clientSocket=tcpServerSocket.accept();pool.execute(new TalkRunnable(clientSocket));//有一個客戶端連接到服務器，就起一個線程來專門處理這個對話}}}

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