使用Socket及ServerSocket创建简单的服务器

@(JAVA)[java]

参考自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();        }    }}

使用线程实现多个客户端同时访问：

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;    }    @Override    public 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.