Java基础深化和提高 ---- 网络编程

public class InetTest {
    public static void main(String[] args)throws Exception {
        //实例化InetAddress对象
        InetAddress inetAddress = InetAddress.getLocalHost();
        //返回当前计算机的IP地址
      System.out.println(inetAddress.getHostAddress());
        //返回当前计算机名
      System.out.println(inetAddress.getHostName());
   }
}

public class InetTest2 {
    public static void main(String[] args)throws Exception {
        InetAddress inetAddress = InetAddress.getByName("www.baidu.com");
      System.out.println(inetAddress.getHostAddress());
      System.out.println(inetAddress.getHostName());
   }
}

public class InetTest3 {
    public static void main(String[] args)throws  Exception {
        InetAddress inetAddress = InetAddress.getByName("14.215.177.38");
      System.out.println(inetAddress.getHostAddress());
      System.out.println(inetAddress.getHostName());
   }
}

public class InetSocketTest {
    public static void main(String[] args) {
        InetSocketAddress inetSocketAddress = new InetSocketAddress("www.baidu.com",80);
      System.out.println(inetSocketAddress.getAddress().getHostAddress());
      System.out.println(inetSocketAddress.getHostName());
   }
}

public class UrlTest {
    public static void main(String[] args)throws Exception {
        URL url = new URL("https://www.itbaizhan.com/search.html?kw=java");
        System.out.println("获取与此URL相关联协议的默认端口："+url.getDefaultPort());
        System.out.println("访问资源："+url.getFile());
        System.out.println("主机名"+url.getHost());
        System.out.println("访问资源路径："+url.getPath());
        System.out.println("协议："+url.getProtocol());
        System.out.println("参数部分："+url.getQuery());
   }
}

public class UrlTest2{
    public static void main(String[] args)throws Exception {
            URL url = new URL("https://www.itbaizhan.com/");
            try (BufferedReader br = new BufferedReader(new InputStreamReader(url.openStream()))) {
             StringBuilder sb = new StringBuilder();
                String temp;
     /*
      * 这样就可以将网络内容下载到本地机器。
      * 然后进行数据分析，建立索引。这也是搜索引擎的第一步。
      */
                while ((temp = br.readLine()) != null) {
                    sb.append(temp);
               }
                System.out.println(sb);
           } catch (Exception e) {
                e.printStackTrace();
           }
   }
}

public class BasicSocketServer {
    public static void main(String[] args) {
        System.out.println("服务器启动等待监听。。。。");
        //创建ServerSocket
        try(ServerSocket ss =new ServerSocket(8888);
            //监听8888端口，此时线程会处于阻塞状态。
            Socket socket = ss.accept();
            //连接成功后会得到与客户端对应的 Socket对象，并解除线程阻塞。
           //通过客户端对应的Socket对象中的输入流对象，获取客户端发送过来的消息。
            BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()))
       ){       
            System.out.println(br.readLine());
       }catch(Exception e){
            e.printStackTrace();
            System.out.println("服务器启动失败。。。。");
       }
   }
}

public class BasicSocketClient {
    public static void main(String[] args) {
        //创建Socket对象
        try(Socket socket =new Socket("127.0.01",8888);
            //创建向服务端发送消息的输出流对象。
            PrintWriter pw = new PrintWriter(socket.getOutputStream())){
            pw.println("服务端，您好！");
            pw.flush();
       }catch(Exception e){
            e.printStackTrace();
       }
   }
}

public class OneWaySocketServer {
    public static void main(String[] args) {
        System.out.println("服务端启动，开始监听。。。。。");
        try(ServerSocket serverSocket = new ServerSocket(8888);
            //监听8888端口，获与取客户端对应的 Socket对象
            Socket socket = serverSocket.accept();
            //通过与客户端对应的Socket对象获取输入流对象
            BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            //通过与客户端对应的Socket对象获取输出流对象
            PrintWriter pw = new PrintWriter(socket.getOutputStream())){
            System.out.println("连接成功！");
            while(true){
                //读取客户端发送的消息
                String str = br.readLine();
                System.out.println("客户端说："+str);
                if("exit".equals(str)){
                    break;
               }
                pw.println(str);
                pw.flush();
           }
       }catch(Exception e){
            e.printStackTrace();
            System.out.println("服务端启动失败。。。。。");
       }
   }
}

public class OneWaySocketClient {
    public static void main(String[] args) {
        //获取与服务端对应的Socket对象
        try(Socket socket = new Socket("127.0.0.1",8888);
        //创建键盘输入对象
            Scanner scanner = new Scanner(System.in);
            //通过与服务端对应的Socket对象获取输出流对象
            PrintWriter pw = new PrintWriter(socket.getOutputStream());
            //通过与服务端对应的Socket对象获取输入流对象
            BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream())))
        {
            while(true){
                //通过键盘输入获取需要向服务端发送的消息
                String str = scanner.nextLine();
                //将消息发送到服务端
                pw.println(str);
                pw.flush();
                if("exit".equals(str)){
                    break;
               }
                //读取服务端返回的消息
                String serverInput = br.readLine();
               System.out.println("服务端返回的："+serverInput);
           }
       }catch(Exception e){
            e.printStackTrace();
       }
   }
}

public class TwoWaySocketServer {
    public static void main(String[] args) {
        System.out.println("服务端启动！监听端口8888。。。。");
        try(ServerSocket serverSocket  = new ServerSocket(8888);
            Socket socket = serverSocket.accept();
            //创建键盘输入对象
            Scanner scanner = new Scanner(System.in);
            //通过与客户端对应的Socket对象获取输入流对象
            BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            //通过与客户单对应的Socket对象获取输出流对象
            PrintWriter pw  = new PrintWriter(socket.getOutputStream());){
            while(true){
                //读取客户端发送的消息
                String str = br.readLine();
                System.out.println("客户端说："+str);
                String keyInput = scanner.nextLine();
                //发送到客户端
                pw.println(keyInput);
                pw.flush();
           }
       }catch(Exception e){
            e.printStackTrace();
       }
   }
}

public class TwoWaySocketClient {
    public static void main(String[] args) {
        try(Socket socket = new Socket("127.0.0.1", 8888);
            //创建键盘输入对象
            Scanner  scanner = new Scanner(System.in);
            //通过与服务端对应的Socket对象获取输入流对象
            BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            //通过与服务端对应的Socket对象获取输出流对象
            PrintWriter pw = new PrintWriter(socket.getOutputStream());){
            while (true) {
                String keyInput = scanner.nextLine();
                pw.println(keyInput);
                pw.flush();
                String input = br.readLine();
                System.out.println("服务端说：" + input);
           }
       } catch (Exception e) {
            e.printStackTrace();
       }
   }
}

/**
* 发送消息线程
*/
class Send extends Thread{
    private Socket socket;
    public Send(Socket socket){
        this.socket = socket;
   }
    @Override
    public void run() {
        this.sendMsg();
   }
    /**
     * 发送消息
     */
    private void sendMsg(){
        //创建Scanner对象
        try(Scanner scanner = new Scanner(System.in);
            //创建向对方输出消息的流对象
            PrintWriter pw = new PrintWriter(this.socket.getOutputStream());)
          {
            while(true){
                String msg = scanner.nextLine();
                pw.println(msg);
                pw.flush();
           }
       }catch(Exception e){
            e.printStackTrace();
       }
   }
}
/**
* 接收消息的线程
*/
class Receive extends Thread{
    private Socket socket;
    public Receive(Socket socket){
        this.socket = socket;
   }
    @Override
    public void run() {
        this.receiveMsg();
   }
    /**
     * 用于接收对方消息的方法
     */
    private void receiveMsg(){
        //创建用于接收对方发送消息的流对象
        try(BufferedReader  br = new BufferedReader(new InputStreamReader(this.socket.getInputStream()));){
            while(true){
                    String msg = br.readLine();
                    System.out.println("他说："+msg);
           }
       }catch(Exception e){
            e.printStackTrace();
       }
   }
}
public class ChatSocketServer {
    public static void main(String[] args) {
        try(ServerSocket serverSocket = new ServerSocket(8888);){
            System.out.println("服务端启动，等待连接。。。。。");
            Socket socket = serverSocket.accept();
            System.out.println("连接成功！");
            new Send(socket).start();
            new Receive(socket).start();
       }catch(Exception e){
            e.printStackTrace();
       }
   }
}

/**
* 用于发送消息的线程类
*/
class ClientSend extends Thread{
    private Socket socket;
    public ClientSend(Socket socket){
        this.socket = socket;
   }
    @Override
    public void run() {
        this.sendMsg();
   }
    /**
     * 发送消息
     */
    private void sendMsg(){
        //创建Scanner对象
        try(Scanner scanner = new Scanner(System.in);
            //创建向对方输出消息的流对象
            PrintWriter pw = new PrintWriter(this.socket.getOutputStream());)
            {
            while(true){
                String msg = scanner.nextLine();
                pw.println(msg);
                pw.flush();
           }
       }catch(Exception e){
            e.printStackTrace();
       }
   }
}
/**
* 用于接收消息的线程类
*/
class ClientReceive extends Thread{
    private Socket socket;
    public ClientReceive(Socket socket){
        this.socket = socket;
   }
    @Override
    public void run() {
        this.receiveMsg();
   }
    /**
     * 用于接收对方消息的方法
     */
    private void receiveMsg(){
        //创建用于接收对方发送消息的流对象
        try(BufferedReader br = new BufferedReader(new InputStreamReader(this.socket.getInputStream()));){
            while(true){
                String msg = br.readLine();
                System.out.println("他说："+msg);
           }
       }catch(Exception e){
            e.printStackTrace();
       }
   }
}
public class ChatSocketClient {
    public static void main(String[] args) {
        try {
            Socket socket = new Socket("127.0.0.1", 8888);
            System.out.println("连接成功！");
            new ClientSend(socket).start();
            new ClientReceive(socket).start();
       }catch(Exception e){
            e.printStackTrace();
       }
   }
}

/**
* 发送消息线程
*/
class Send extends Thread{
    private Socket socket;
    private Scanner scanner;
    public Send(Socket socket,Scanner scanner){
        this.socket = socket;
        this.scanner = scanner;
}
    @Override
    public void run() {
        this.sendMsg();
   }
    /**
     * 发送消息
     */
    private void sendMsg(){
        //创建向对方输出消息的流对象
        try(PrintWriter pw = new PrintWriter(this.socket.getOutputStream()))
{
            while(true){
                String msg = scanner.nextLine();
                pw.println(msg);
                pw.flush();
           }
       }catch(Exception e){
            e.printStackTrace();
       }
   }
}
/**
* 接收消息的线程
*/
class Receive extends Thread{
    private Socket socket;
  public Receive(Socket socket){
        this.socket = socket;
   }
    @Override
    public void run() {
        this.receiveMsg();
   }
    /**
     * 用于接收对方消息的方法
     */
    private void receiveMsg(){
        //创建用于接收对方发送消息的流对象
        try(BufferedReader br = new BufferedReader(new InputStreamReader(this.socket.getInputStream()))){
            while(true){
                String msg = br.readLine();
                System.out.println("他说："+msg);
           }
       }catch(Exception e){
            e.printStackTrace();
       }
   }
}
public class GoodTCP {
    public static void main(String[] args)
      {
        Scanner scanner = null;
        ServerSocket serverSocket = null;
        Socket socket = null;
        try{
            scanner = new Scanner(System.in);
            System.out.println("请输入：server,<port> 或者：<ip>,<port>");
            String str = scanner.nextLine();
            String[] arr = str.split(",");
            if("server".equals(arr[0])){
                //启动服务端
                System.out.println("TCP Server Listen at "+arr[1]+" .....");
                serverSocket = new ServerSocket(Integer.parseInt(arr[1]));
                socket = serverSocket.accept();
                System.out.println("连接成功！");
           }else{
                //启动客户端
                socket = new Socket(arr[0],Integer.parseInt(arr[1]));
                System.out.println("连接成功！");
           }
            //启动发送消息的线程
            new Send(socket,scanner).start();
            //启动接收消息的线程
         }catch(Exception e){
            e.printStackTrace();
       }finally{
            if(serverSocket != null){
                try {
                    serverSocket.close();
               } catch (IOException e) {
                    e.printStackTrace();
               }
           }
       }
   }
}

/**
* 定义消息处理线程类
*/
class Msg extends Thread{
    private Socket socket;
    public Msg(Socket socket){
        this.socket = socket;
   }
    @Override
    public void run() {
        this.msg();
   }
    /**
     * 将从客户端读取到的消息写回给客户端
     */
    private void msg(){
        try(BufferedReader br = new BufferedReader(new InputStreamReader(this.socket.getInputStream()));
            PrintWriter pw = new PrintWriter(this.socket.getOutputStream())){
            while(true){
                pw.println(br.readLine()+" [ok]");
                pw.flush();
           }
       }catch(Exception e){
            e.printStackTrace();
          System.out.println(this.socket.getInetAddress()+" 断线了！");
       }
   }
}
public class EchoServer {
    public static void main(String[] args) {
        try(ServerSocket serverSocket = new ServerSocket(8888)){
            //等待多客户端连接
            while(true){
                Socket socket = serverSocket.accept();
                new Msg(socket).start();
           }
       }catch(Exception e){
            e.printStackTrace();
       }
   }
}

/**
* 接收客户端消息的线程类
*/
class ChatReceive extends Thread{
    private Socket socket;
    public ChatReceive(Socket socket){
        this.socket =socket;
   }
    @Override
    public void run() {
        this.receiveMsg();
   }
    /**
     * 实现接收客户端发送的消息
     */
    private void receiveMsg(){
        try(BufferedReader br = new BufferedReader(new InputStreamReader(this.socket.getInputStream()))){
            while(true){
                String msg = br.readLine();
                synchronized ("abc"){
                    //把读取到的数据写入公共数据区
                    ChatRoomServer.buf=" ["+this.socket.getInetAddress()+"] "+msg;
                    //唤醒发送消息的线程对象。
                    "abc".notifyAll();
               }
           }
       }catch(Exception e){
            e.printStackTrace();
       }
   }
}
/**
* 向客户端发送消息的线程类
*/
class ChatSend extends Thread{
    private Socket socket;
    public ChatSend(Socket socket){
        this.socket = socket;
   }
    @Override
    public void run() {
        this.sendMsg();
   }
    /**
     * 将公共数据区的消息发送给客户端
     */
    private void sendMsg(){
        try(PrintWriter  pw = new PrintWriter(this.socket.getOutputStream())){
            while(true){
                synchronized ("abc"){
                    //让发送消息的线程处于等待状态
                    "abc".wait();
                    //将公共数据区中的消息发送给客户端
                    pw.println(ChatRoomServer.buf);
                    pw.flush();
               }
           }
       }catch(Exception e){
            e.printStackTrace();
       }
   }
}
public class ChatRoomServer {
    //定义公共数据区
    public static String buf;
    public static void main(String[] args) {
        System.out.println("Chat Server Version 1.0");
        System.out.println("Listen at 8888.....");
        try(ServerSocket serverSocket = new ServerSocket(8888)){
            while(true){
                Socket socket = serverSocket.accept();
                System.out.println("连接到："+socket.getInetAddress());
                new ChatReceive(socket).start();
                new ChatSend(socket).start();
           }
       }catch(Exception e){
            e.printStackTrace();
       }
   }
}

public class UDPServer {
    public static void main(String[] args) {
        //创建服务端接收数据的DatagramSocket对象
        try(DatagramSocket datagramSocket = new DatagramSocket(9999)){
            //创建数据缓存区
            byte[] b = new byte[1024];
            //创建数据报包对象
            DatagramPacket dp =new DatagramPacket(b,b.length);
            //等待接收客户端所发送的数据
            datagramSocket.receive(dp);
            String str = new String(dp.getData(),0,dp.getLength());
            System.out.println(str);
       }catch(Exception e){
            e.printStackTrace();
       }
   }
}

public class UDPClient {
    public static void main(String[] args) {
        //创建数据发送对象 DatagramSocket,需要指定消息的发送端口
        try(DatagramSocket ds = new DatagramSocket(8888)) {
            //消息需要进行类型转换，转换成字节数据类型。
            byte[] b = "程序员".getBytes();
            //创建数据报包装对象DatagramPacket
            DatagramPacket dp = new DatagramPacket(b, b.length, new InetSocketAddress("127.0.0.1", 9999));
            //发送消息
            ds.send(dp);
       }catch(Exception e){
            e.printStackTrace();
       }
   }
}

public class BasicTypeUDPServer {
    public static void main(String[] args) {
        try(DatagramSocket datagramSocket = new DatagramSocket(9999)){
            byte[] buf = new byte[1024];
            DatagramPacket dp = new DatagramPacket(buf,buf.length);
            datagramSocket.receive(dp);
            //实现数据类型转换
            try(DataInputStream dis = new DataInputStream(new ByteArrayInputStream(dp.getData()))){
                //通过基本数据数据流对象获取传递的数据
              System.out.println(dis.readLong());
           }
       }catch(Exception e){
            e.printStackTrace();
       }
   }
}

public class BasicTypeClient {
    public static void main(String[] args) {
        long n = 2000L;
        try(DatagramSocket datagramSocket = new DatagramSocket(9000);
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            DataOutputStream dos = new DataOutputStream(bos)){
            dos.writeLong(n);
            //将基本数据类型数据转换成字节数组类型
            byte[] arr = bos.toByteArray();
            DatagramPacket dp = new DatagramPacket(arr,arr.length,new InetSocketAddress("127.0.0.1",9999));
            datagramSocket.send(dp);
       }catch (Exception e){
            e.printStackTrace();
       }
   }
}

/**
* 当该对象需要在网络上传输时，一定要实现Serializable接口
*/
public class Person implements Serializable
{
    private String name;
    private int age;
    public String getName() {
        return name;
   }
    public void setName(String name) {
        this.name = name;
   }
    public int getAge() {
        return age;
   }
    public void setAge(int age) {
        this.age = age;
   }
    @Override
    public String toString() {
        return "Person{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
   }
}

public class ObjectTypeServer {
    public static void main(String[] args) {
        try(DatagramSocket datagramSocket = new DatagramSocket(9999);){
            byte[] b = new byte[1024];
            DatagramPacket dp = new DatagramPacket(b,b.length);
            datagramSocket.receive(dp);
            //对接收的内容做类型转换
            try(ObjectInputStream objectInputStream = new ObjectInputStream(new ByteArrayInputStream(dp.getData()))){
               System.out.println(objectInputStream.readObject());
           }
       }catch(Exception e){
            e.printStackTrace();
       }
   }
}

public class ObjectTypeClient {
    public static void main(String[] args) {
        try(DatagramSocket datagramSocket = new DatagramSocket(8888);
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            ObjectOutputStream oos = new ObjectOutputStream(bos)){
            Person p = new Person();
            p.setName("Oldlu");
            p.setAge(18);
            oos.writeObject(p);
            byte[] arr = bos.toByteArray();
            DatagramPacket dp = new DatagramPacket(arr,arr.length,new InetSocketAddress("127.0.0.1",9999));
            datagramSocket.send(dp);
       }catch(Exception e){
            e.printStackTrace();
       }
   }
}