ServerSoket/Socket聊天簡單實現V2(單線程，一個客戶端對一個服務器，客戶端可接收可發送，服務器可接收可發送【發送後需等到再次接收到消息才能再次發送】)

知識點：服務器端只會起一個線程對所有的客戶端連接進行處理，這樣會因爲某個客戶端處理的阻塞，而導致其他客戶端得不到處理。
源碼如下：分服務器Server/客戶端Client兩個類。
package communication;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.ServerSocket;
import java.net.Socket;

/**

• @author Dylaniou
• 需要先啓動服務器
  */
  public class Server {
  static ServerSocket serverSocket = null;
  static int port = 18000;
  static Socket socket = null;
  public static void main(String[] args) throws IOException {
  serverSocket = new ServerSocket(port);
  System.out.println(“服務器啓動成功，等待客戶端請求”);
  socket = serverSocket.accept();
  System.out.println(“收到客戶端請求”);
  BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
  BufferedReader br2 = new BufferedReader(new InputStreamReader(System.in));
  BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
  String line = null;
  while((line = br.readLine())!=null){
  System.out.println(“客戶端：” + line+ “，服務器請回答~”);
  line = br2.readLine();
  bw.write(line);
  bw.newLine();
  bw.flush();
  System.out.println(“服務器：” + line+ “，客戶端請回答~”);
  line = null;
  }
  br2.close();
  bw.close();
  br.close();
  }
  }

package communication;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.Socket;
import java.net.UnknownHostException;

/**

• @author Dylaniou
• 需要先啓動服務器
  */
  public class Client {
  static Socket socket = null;
  static int port = 18000;
  public static void main(String[] args) throws UnknownHostException, IOException {
  socket = new Socket(“localhost”,port);
  System.out.println(“客戶端成功建立socket連接”);
  //發送命令行消息給服務器
  //將命令行字節輸入流轉換爲字符輸入流，利用緩衝字符輸入流讀取命令行消息
  BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
  //將socket字節輸出流轉換爲字符輸出流，利用緩衝字符輸出流輸出命令行消息
  BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
  BufferedReader br2 = new BufferedReader(new InputStreamReader(socket.getInputStream()));
  String line =null;
  while((line = br.readLine())!=null){
  System.out.println( “客戶端：” + line+"，服務器請回答~");
  bw.write(line);
  bw.newLine();//用於終止輸出行，不然命令行輸入再多內容也無法發送出去
  bw.flush();
  System.out.println(“服務器：” + br2.readLine() + “，客戶端請回答~”);
  line = null;
  }
  bw.close();
  br.close();
  }
  }