网络通信--UDP
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[TOC]
UDP实现收发数据
接收数据
(1)使用DatagramSocket(int port )创建一个数据包套接字，绑定到指定端口(2)使用DataPacket(byte[] buf,int length)创建字节数组来接收数据包(3)使用DatagramSocket类的receive()方法发送数据包public static void main(String[] args) { try { //接收数据时必须指定端口 DatagramSocket socket=new DatagramSocket(8080); byte [] array=new byte[1024]; DatagramPacket pack=new DatagramPacket(array, 1024); socket.receive(pack); //把接收到的数据存入数组 byte [] data=pack.getData(); //将数组转化成字符串打印输出 System.out.println(new String(data)); //System.out.println(new String(array,0,pack.getLength())); 用getLength()得到要接受或发送数据的长度 //最后一定要将流关闭 socket.close(); } catch (SocketException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); }}发送数据
(1)使用DatagramSocket( )创建一个数据包套接字(2)使用DataPacket(byte[] buf,int offset,int length,InetAddress address,port)创建要发送的数据包(3)使用DatagramSocket类的send()方法发送数据包public static void main(String[] args) { try { //发送时不用指定端口 DatagramSocket send=new DatagramSocket(); String a="duyongkang"; byte[]array=a.getBytes(); //指定要发送到的主机，数据和端口号 DatagramPacket pack=new DatagramPacket(array, array.length,InetAddress.getLocalHost(),8080); send.send(pack);//发送数据 System.out.println("已经发送数据"); send.close();//最后将流关闭 } catch (SocketException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } }UDP相互交流
先运行接收,在运行发送
接收数据代码部分
//接收数据代码部分public static void main(String[] args) { try { DatagramSocket socket=new DatagramSocket(8080); DatagramPacket pack=null; DatagramSocket send=new DatagramSocket(); Scanner input=new Scanner(System.in); DatagramPacket pac=null; while(true){ byte [] array=new byte[1024]; pack=new DatagramPacket(array, 1024); socket.receive(pack); byte [] data=pack.getData(); //System.out.println(new String(array,0,pack.getLength())); 用getLength()得到要接受或发送数据的长度 System.out.println(new String(data)); String str=input.next(); byte[]array1=str.getBytes(); pac=new DatagramPacket(array1, array1.length,InetAddress.getByName("192.168.0.31"),8081); send.send(pac); System.out.println("已经发送数据"); } //socket.close(); } catch (SocketException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); }}发送数据代码部分
public static void main(String[] args) { try { DatagramSocket socket=new DatagramSocket(8081); DatagramPacket pack=null; DatagramSocket send=new DatagramSocket(); Scanner input=new Scanner(System.in); DatagramPacket pac=null; while(true){ String str=input.next(); byte[]array=str.getBytes(); //用getByName得到ip地址 pac=new DatagramPacket(array, array.length,InetAddress.getByName("192.168.0.31"),8080); send.send(pac); System.out.println("已经发送数据"); byte [] array1=new byte[1024]; pack=new DatagramPacket(array1, 1024); socket.receive(pack); byte [] data=pack.getData(); System.out.println(new String(data)); } //send.close();//最后将流关闭 } catch (SocketException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } }在界面上聊天
//**********************************************public class MyClientRead implements Runnable{ private MyClient client; public MyClientRead(MyClient client){ this.client=client; } @Override public void run() { while(true){ client.read(); } }}//*******************************************public class MyServerRead implements Runnable{ private MyServer server; private Socket socket; public MyServerRead(MyServer server,Socket socket){ this.server=server; this.socket=socket; } @Override public void run() { while(server.isRunning()){ server.read(socket); } }}//*********************************************public class MyClient extends JFrame { private JPanel contentPane; private JList list; private JTextArea textArea; private Socket socket; private DefaultListModel<String> modle; /** * Launch the application. */ public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { MyClient frame = new MyClient(); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } /** * Create the frame. */ public MyClient() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 450, 300); contentPane = new JPanel(); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); setContentPane(contentPane); contentPane.setLayout(null); JButton btnNewButton = new JButton("发送"); btnNewButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { write(); } }); btnNewButton.setBounds(314, 201, 93, 51); contentPane.add(btnNewButton); textArea = new JTextArea(); textArea.setBounds(41, 201, 240, 51); contentPane.add(textArea); list = new JList(); list.setBounds(41, 25, 240, 157); modle=new DefaultListModel<>(); list.setModel(modle); contentPane.add(list); JButton btnNewButton_1 = new JButton("连接服务器"); btnNewButton_1.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { try { System.out.println("连接服务器"); socket=new Socket("localhost", 8080); System.out.println("连接服务器成功"); Thread t=new Thread(new MyClientRead(MyClient.this)); t.start(); } catch (UnknownHostException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } catch (IOException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } } }); btnNewButton_1.setBounds(314, 47, 93, 42); contentPane.add(btnNewButton_1); } public void write(){ try { OutputStream os=socket.getOutputStream(); BufferedWriter bw=new BufferedWriter(new OutputStreamWriter(os)); String words= textArea.getText(); bw.write(words+"\n"); modle.addElement(words); textArea.setText(""); bw.flush(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } public void read() { try { InputStream is = socket.getInputStream(); BufferedReader br = new BufferedReader(new InputStreamReader(is)); String line = br.readLine(); modle.addElement(""+line);//让服务器说的话出现在客户端的JList list上 System.out.println(line); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } }}//****************************************public class MyServer extends JFrame { private JPanel contentPane; private ArrayList<Socket> sockets; private JTextArea textArea; private boolean isRunning = true; private JButton btnNewButton_1; private JList list; private DefaultListModel<String> modle; public boolean isRunning() { return isRunning; } public void setRunning(boolean isRunning) { this.isRunning = isRunning; } /** * Launch the application. */ public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { MyServer frame = new MyServer();//???????????????????????????????????? frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } /** * Create the frame. */ public MyServer() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 481, 358); contentPane = new JPanel(); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); setContentPane(contentPane); contentPane.setLayout(null); JButton btnNewButton1 = new JButton("开启服务器 "); btnNewButton1.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { isRunning = true; //这个线程等待客户端链接服务器 new Thread(new Runnable() { @Override public void run() { try { ServerSocket server = new ServerSocket(8080); System.out.println("服务器启动"); sockets = new ArrayList<>(); while (isRunning) { Socket socket = server.accept();//等待客户端连接进来 sockets.add(socket); //下边这个线程专门用来等待socket发送过来的信息 //???????????????? Thread t = new Thread(new MyServerRead(MyServer.this,socket)); t.start(); System.out.println("有客户端连接"); } } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }).start();// ; } }); btnNewButton1.setBounds(362, 36, 93, 45); contentPane.add(btnNewButton1); textArea = new JTextArea(); textArea.setBounds(39, 250, 303, 45); contentPane.add(textArea); btnNewButton_1 = new JButton("发送给客户"); btnNewButton_1.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { //modle是干啥的????????????? modle.addElement(textArea.getText()); write(); } }); btnNewButton_1.setBounds(352, 250, 93, 45); contentPane.add(btnNewButton_1); modle = new DefaultListModel<>(); list = new JList(); list.setModel(modle); list.setBounds(39, 21, 303, 219); contentPane.add(list); } public void read(Socket socket) { if (socket.isConnected()) { try { InputStream is = socket.getInputStream();//只能读字节 InputStreamReader isr = new InputStreamReader(is);//读字符 BufferedReader br = new BufferedReader(isr);//将字符换成一行 String line = br.readLine(); //让客户端的话出现在服务器的JList list上 modle.addElement(socket.getInetAddress().getHostName() + " " + line); System.out.println(line); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } else { sockets.remove(socket); } } /** * 这里是服务器发送消息 */ public void write() { try { for (Socket socket : sockets) { OutputStream os = socket.getOutputStream(); OutputStreamWriter osw = new OutputStreamWriter(os); BufferedWriter bw = new BufferedWriter(osw); String words = textArea.getText(); System.out.println("服务器发送消息"); bw.write(words + "\n"); bw.flush(); } textArea.setText(""); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } 0 0
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