? 參考自core java

package com.lujinhong.corejava;import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.io.PrintWriter; import java.net.ServerSocket; import java.net.Socket; import java.util.Scanner;public class EchoServer {public static void main(String[] args) {try {ServerSocket serverSocket = new ServerSocket(8019);Socket socket = serverSocket.accept();InputStream is = socket.getInputStream();OutputStream os = socket.getOutputStream();PrintWriter pw = new PrintWriter(os);Scanner sc = new Scanner(is);Boolean flag = false;String line = null;String exitString = "bye";while(!flag && sc.hasNextLine()){pw.println("Hello, type " + exitString + " to exit!");line = sc.nextLine();if(line.trim().equals(exitString)){flag = true;}else{pw.println("Hello, "+line);}}pw.close();sc.close();serverSocket.close();} catch (IOException e) {e.printStackTrace();}} }

使用線程實現(xiàn)多個客戶端同時訪問：

package com.lujinhong.corejava;import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.io.PrintWriter; import java.net.ServerSocket; import java.net.Socket; import java.util.Scanner;public class MultiEchoServer {public static void main(String[] args) {try {ServerSocket serverSocket = new ServerSocket(8189);while (true) {Socket socket = serverSocket.accept();Runnable r = new ThreadedEchoHandler(socket);Thread thread = new Thread(r);thread.start();}} catch (IOException e) {e.printStackTrace();}}}class ThreadedEchoHandler implements Runnable {private Socket s = null;public ThreadedEchoHandler(Socket socket) {s = socket;}@Overridepublic void run() {try {InputStream is = s.getInputStream();OutputStream os = s.getOutputStream();PrintWriter pw = new PrintWriter(os);Scanner sc = new Scanner(is);Boolean flag = false;String line = null;String exitString = "bye";while (!flag && sc.hasNextLine()) {pw.println("Hello, type " + exitString + " to exit!");line = sc.nextLine();if (line.trim().equals(exitString)) {flag = true;} else {pw.println("Hello, " + line);}}sc.close();pw.close();} catch (IOException e) {e.printStackTrace();}} }
In this program, we spawn a separate thread for each connection. This approach is not satisfactory for highperformance?servers. You can achieve greater server throughput by using features of the java.nio package. See?www.ibm.com/developerworks/java/library/j-javaio for more information.

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