JAVA网络编程基础-1-快速网络编程入门-聊天服务器实现

java的网络编程部分是如此有魅力,以至于一旦开始使用Java网络API，只要你能想到它就能够做得到.

java网络编程可以实现功能完整的网络客户端和服务器,无论是希望编写特殊用途的Web服务器、安全的在线订单接收程序、简单的组播代理还是电子邮件客户端，都会找到可供学习和借用的代码。

下面我们来戳一下java网络编程,入个小门

1.HelloWorld 网络编程

package day20150810;import java.io.IOException;import java.io.InputStream;import java.net.Socket;import java.net.UnknownHostException;import java.util.Scanner;public class SocketDemo {public static void main(String[] args) {Socket socket = null;try {//建立一个套接字socket = new Socket("72.5.124.55", 13);InputStream in = socket.getInputStream();Scanner scanner = new Scanner(in);while(scanner.hasNextLine()){System.out.println(scanner.nextLine());}} catch (UnknownHostException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}finally{try {socket.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}

超时属性

socket.setSoTimeOut(1000);这个属性是建立连接后,如果规定时间内没有完成读写操作,就抛出SocketTimeOutException异常

获取主机地址

getAddress方法可以获取IP地址

package day20150810;import java.net.InetAddress;public class GetAddress {public static void main(String[] args) throws Exception {String host = "www.baidu.com";InetAddress[] addresses = InetAddress.getAllByName(host);for(InetAddress a:addresses)System.out.println(a);}}

2.服务器实现

我们下面实现一个简单的聊天服务器

可以通过telnet进行通信

package day20150810;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.io.PrintWriter;import java.net.Socket;import java.util.Scanner;/** *  * @author BigCaiCai * */public class ServerSocket {public static void main(String[] args) throws Exception {//我们使用8888这个端口java.net.ServerSocket serverSocket = new java.net.ServerSocket(8888);//建立一个负责检测8888这个端口的服务器Socket socket  = serverSocket.accept();boolean isClose = false;OutputStream outputStream = socket.getOutputStream();InputStream inputStream = socket.getInputStream();Scanner scanner = new Scanner(inputStream);PrintWriter printWriter = new PrintWriter(outputStream,true);printWriter.println("Enter Bye to close Server!");while(!isClose&&scanner.hasNextLine()){String get = scanner.nextLine();if(get.equals("Bye")){System.out.println("Bye~~");printWriter.println("Bye~~");}else{System.out.println(get.toString());printWriter.println("Context:"+get);}}System.out.println("结束");inputStream.close();outputStream.close();}}

3.聊天客户端简单实现

简单改一下helloworld后可以发现,有和telnet一样的效果了

package day20150810;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.io.PrintWriter;import java.net.Socket;import java.net.UnknownHostException;import java.util.Scanner;public class SocketDemo {public static void main(String[] args) {Socket socket = null;try {//建立一个套接字socket = new Socket("localhost", 8888);boolean isClose = false;InputStream in = socket.getInputStream();OutputStream out = socket.getOutputStream();PrintWriter printWriter = new PrintWriter(out,true);Scanner scanner = new Scanner(in);printWriter.println("Hi,I'm c.");while(!isClose&&scanner.hasNextLine()){String get = scanner.nextLine();if(get.equals("Bye")){isClose=true;}else{Scanner w = new Scanner(System.in);printWriter.println("c send Message:"+w.nextLine());}System.out.println();}} catch (UnknownHostException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}finally{try {socket.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}

4.利用多线程实现,可以为多个客户端服务的服务器

服务器代码

package day20150810;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.io.PrintWriter;import java.net.Socket;import java.util.Scanner;/** *  * @author BigCaiCai * */public class ServerSocket {public static void main(String[] args) throws Exception {//我们使用8888这个端口java.net.ServerSocket serverSocket = new java.net.ServerSocket(8888);int i = 1;Socket socket = null;while(true){//为每一个连接进来的服务器建立一个负责检测8888这个端口的服务器socket  = serverSocket.accept();socket.setKeepAlive(true);socket.setSoTimeout(100000);OutputStream outputStream = socket.getOutputStream();InputStream inputStream = socket.getInputStream();Thread thread = new Thread(new SocketThread(outputStream, inputStream,i));thread.start();i++;}}}class SocketThread implements Runnable{private OutputStream outputStream;private InputStream inputStream;private int i;public SocketThread(OutputStream outputStream, InputStream inputStream,int i) {super();this.outputStream = outputStream;this.inputStream = inputStream;this.i = i ;}@Overridepublic void run() {// TODO Auto-generated method stubSystem.out.println("Clent"+i+"connect!");boolean isClose = false;Scanner scanner = new Scanner(inputStream);PrintWriter printWriter = new PrintWriter(outputStream,true);printWriter.println("Hi,I'm s.Enter Bye to close Server!");while(!isClose&&scanner.hasNextLine()){String get = scanner.nextLine();if(get.equals("Bye")){System.out.println("Bye");printWriter.println("Bye~~");isClose = true;}else{System.out.println("Clent"+i+get.toString());}}System.out.println("End connect "+i+"~~~");try {inputStream.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}try {outputStream.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}

客户端代码

package day20150810;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.io.PrintWriter;import java.net.Socket;import java.net.UnknownHostException;import java.util.Scanner;public class SocketDemo {public static void main(String[] args) {Socket socket = null;try {//建立一个套接字socket = new Socket("localhost", 8888);boolean isClose = false;socket.setKeepAlive(true);InputStream in = socket.getInputStream();OutputStream out = socket.getOutputStream();PrintWriter printWriter = new PrintWriter(out,true);Scanner scanner = new Scanner(in);while(!isClose&&scanner.hasNextLine()){String get  = new Scanner(System.in).nextLine();if(get.equals("Bye")){isClose=true;printWriter.println("c send Message:"+get);}else{printWriter.println("c send Message:"+get);}System.out.println();}} catch (UnknownHostException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}finally{try {socket.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}

可中断套接字实现的客户端

package day20150811;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.io.PrintWriter;import java.net.InetSocketAddress;import java.net.Socket;import java.net.SocketAddress;import java.net.UnknownHostException;import java.nio.channels.Channels;import java.nio.channels.SocketChannel;import java.util.Scanner;public class SocketChannelClient {public static void main(String[] args) {SocketChannel socket = null;try {//建立一个套接字socket = SocketChannel.open(new InetSocketAddress("localhost", 8888));boolean isClose = false;InputStream in = Channels.newInputStream(socket);OutputStream out = Channels.newOutputStream(socket);PrintWriter printWriter = new PrintWriter(out,true);Scanner scanner = new Scanner(in);while(!isClose&&scanner.hasNextLine()){String get  = new Scanner(System.in).nextLine();if(get.equals("Bye")){isClose=true;printWriter.println("c send Message:"+get);}else{printWriter.println("c send Message:"+get);}System.out.println();}} catch (UnknownHostException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}finally{try {socket.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}