黑马程序员--第二十三天：网络编程第一天

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//23-4import java.net.*;class  IPDemo{public static void main(String[] args) throws Exception{//InetAddress i = InetAddress.getLocalHost();//System.out.println(i.toString());//System.out.println(i.getHostAddress());//System.out.println(i.getHostName());InetAddress in[] = InetAddress.getAllByName("www.baidu.com");/*for (InetAddress i : in){System.out.println(i.toString());System.out.println(i.getHostAddress());System.out.println(i.getHostName());}*/for (InetAddress i : in)System.out.println(i.toString());}}/*23-5UDP特点：1.将数据封装成数据包，不需要建立连接2.每个数据包大小在64k内3.面向无连接，是不可靠协议4.不需要建立连接，速度快。(力求速度)(每个包的小于64k，无连接，不可靠，但是速度快)TCP特点:1.建立连接，形成传输数据通道。2.在连接过程中进行大数据量传输3.通过三次握手完成连接，是可靠协议。4.必须建立连接，效率会稍低(三次握手建立连接，可靠，效率稍低，但是大数据量传输).*//*23-6Socket //可以理解为港口，网络通信其实就是Socket通信，数据在Socket间通过io传输。*//*23-71.建立udpsocket服务2.提供数据并将数据封装到数据包3.通过socket的send功能把数据发出去4.关闭资源*/import java.net.*;/*class UDPDemo {public static void main(String[] args) {System.out.println("Hello World!");}}*/class UDPSend{public static void main(String[] args) throws Exception{//1.建立udpsocket服务DatagramSocket ds = new DatagramSocket(8888);//2.提供数据并将数据封装到数据包byte[] buf = "upd data".getBytes();DatagramPacket dp = new DatagramPacket(buf,buf.length,InetAddress.getByName("First-Pc"),10000);//3.通过socket的send功能把数据发出去ds.send(dp);//4.关闭资源ds.close();System.out.println("Hello World!");}}/*23-81.建立udpsocket服务2.定义一个数据包，用于存储接收到的字节数据3.通过socket服务的receive接收数据到包中4.取出数据5.关闭资源*/class UDPReceive{public static void main(String[] args) throws Exception{//1.建立udpsocket服务,通常会监听一个端口，给接收网络应用程序定义一个数字表示DatagramSocket ds = new DatagramSocket(10000);while(true){//2.提供数据并将数据封装到数据包byte[] buf = new byte[1024];DatagramPacket dp = new DatagramPacket(buf,buf.length);//3.通过socket的receive功能接收数据ds.receive(dp);//4.获取包中的数据String ip = dp.getAddress().getHostAddress();dp.getData();String data = new String(dp.getData(),0,dp.getLength());int port = dp.getPort();System.out.println(ip+"::"+data+"::"+port);}//5.关闭资源//ds.close();}}//23-9import java.net.*;import java.io.*;class UDPSend2{public static void main(String[] args) throws Exception{//1.建立udpsocket服务DatagramSocket ds = new DatagramSocket(8888);BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));String line = null;while (!(line = bf.readLine()).equals("88")){byte[] buf = line.getBytes();DatagramPacket dp = new DatagramPacket(buf,buf.length,InetAddress.getByName("255.255.255.255"),10000);ds.send(dp);}//2.提供数据并将数据封装到数据包//byte[] buf = "upd data".getBytes();//DatagramPacket dp = new DatagramPacket(buf,buf.length,InetAddress.getByName("First-Pc"),10000);//3.通过socket的send功能把数据发出去//ds.send(dp);//4.关闭资源ds.close();System.out.println("Hello World!");}}class UDPReceive2{public static void main(String[] args) throws Exception{//1.建立udpsocket服务,通常会监听一个端口，给接收网络应用程序定义一个数字表示DatagramSocket ds = new DatagramSocket(10000);while(true){//2.提供数据并将数据封装到数据包byte[] buf = new byte[1024*64];DatagramPacket dp = new DatagramPacket(buf,buf.length);//3.通过socket的receive功能接收数据ds.receive(dp);//4.获取包中的数据String ip = dp.getAddress().getHostAddress();dp.getData();String data = new String(dp.getData(),0,dp.getLength());int port = dp.getPort();System.out.println(ip+":");System.out.println(data+":--:"+port);}//5.关闭资源//ds.close();}}/*23-10编写一个聊天程序。*/import java.net.*;import java.io.*;class  ChatDemo{public static void main(String[] args) throws Exception{DatagramSocket sendSocket = new DatagramSocket();DatagramSocket receiveSocket = new DatagramSocket(10001);new Thread(new Send(sendSocket)).start();new Thread(new Receive(receiveSocket)).start();//System.out.println("Hello World!");}}class Send implements Runnable{private DatagramSocket ds;public Send(DatagramSocket ds){this.ds = ds;}public void run(){try{//1.建立udpsocket服务//DatagramSocket ds = new DatagramSocket(8888);BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));String line = null;while (!(line = bf.readLine()).equals("88")){byte[] buf = line.getBytes();DatagramPacket dp = new DatagramPacket(buf,buf.length,InetAddress.getByName("first-pc"),10001);ds.send(dp);}}catch(Exception e){throw new RuntimeException("发送失败");}//2.提供数据并将数据封装到数据包//byte[] buf = "upd data".getBytes();//DatagramPacket dp = new DatagramPacket(buf,buf.length,InetAddress.getByName("First-Pc"),10000);//3.通过socket的send功能把数据发出去//ds.send(dp);//4.关闭资源finally{ds.close();}//System.out.println("Hello World!");}}class Receive implements Runnable{private DatagramSocket ds;public Receive(DatagramSocket ds){this.ds = ds;}public void run() {//1.建立udpsocket服务,通常会监听一个端口，给接收网络应用程序定义一个数字表示//DatagramSocket ds = new DatagramSocket(10000);try{while(true){//2.提供数据并将数据封装到数据包byte[] buf = new byte[1024*64];DatagramPacket dp = new DatagramPacket(buf,buf.length);//3.通过socket的receive功能接收数据ds.receive(dp);//4.获取包中的数据String ip = dp.getAddress().getHostAddress();dp.getData();String data = new String(dp.getData(),0,dp.getLength());int port = dp.getPort();System.out.println(ip+":");System.out.println(data+":--:"+port);}}catch(Exception e){throw new RuntimeException("接收失败");}//5.关闭资源//ds.close();}}/*23-111.Socket,对象建立时连接主机2.ServerSocket*//*1.创建Socket服务，连接主机和端口2.*/import java.net.*;import java.io.*;/*class TCPDemo {public static void main(String[] args) throws Exception{//创建Socket服务，连接主机和端口Socket s = new Socket("First-Pc",10003);OutputStream out = s.getOutputStream();out.write("TCP data");s.close();System.out.println("Hello World!");}}*/class ClientDemo {public static void main(String[] args) throws Exception{//创建Socket服务，连接主机和端口Socket s = new Socket("First-Pc",10004);OutputStream out = s.getOutputStream();out.write("TCP data".getBytes());s.close();System.out.println("Hello World!");}}/*1.建立服务端的ServerSocket,并监听一个端口。2.获取连接过来的客户端对象。通过accept方法(阻塞式)3.客户端如果发过来数据，服务端要使用对应的客户端对象，并获得客户端对象的读取流来读取发过来的数据4.关闭服务端（可选操作）；*/class ServerDemo {public static void main(String[] args) throws Exception{//创建Socket服务，连接主机和端口ServerSocket ss = new ServerSocket(10004);Socket s = ss.accept();//通过accept获取连接过来的客户端 Socket对象String ip = s.getInetAddress().getHostAddress();System.out.println(ip+":....");InputStream in = s.getInputStream();byte[] buf = new byte[1024];int len= in.read(buf);System.out.println(new String(buf,0,len));s.close();System.out.println("Hello World!");}}import java.net.*;import java.io.*;/*23-12class TCPDemo {public static void main(String[] args) throws Exception{//创建Socket服务，连接主机和端口Socket s = new Socket("First-Pc",10003);OutputStream out = s.getOutputStream();out.write("TCP data");s.close();System.out.println("Hello World!");}}*/class ClientDemo2 {public static void main(String[] args) throws Exception{//创建Socket服务，连接主机和端口Socket s = new Socket("First-Pc",10004);OutputStream out = s.getOutputStream();out.write("TCP data".getBytes());InputStream in = s.getInputStream();byte[] buf = new byte[1024];int len = in.read(buf);System.out.println(new String(buf,0,len));s.close();}}class ServerDemo2 {public static void main(String[] args) throws Exception{//创建Socket服务，连接主机和端口ServerSocket ss = new ServerSocket(10004);Socket s = ss.accept();//通过accept获取连接过来的客户端对象String ip = s.getInetAddress().getHostAddress();System.out.println(ip+":....");InputStream in = s.getInputStream();byte[] buf = new byte[1024];int len= in.read(buf);System.out.println(new String(buf,0,len));OutputStream out = s.getOutputStream();out.write("hello".getBytes());s.close();System.out.println("Hello World!");}}/*23-13需求：建立一个文本转换服务器。客户端给服务端发送文本，服务端会将文本转换成大写再返回给客户端。而且客户端可以不断的进行文本转换，当客户端输入over时，转换结束。*/import java.net.*;import java.io.*;class ClientTransText{public static void main(String[] args) throws Exception{//创建Socket服务，连接主机和端口Socket s = new Socket("First-Pc",10005);BufferedReader br = new BufferedReader(new InputStreamReader(System.in));BufferedReader in = new BufferedReader(new InputStreamReader(s.getInputStream()));//BufferedWriter out = new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));//PrintStream br = new PrintStream(System.in);//PrintStream in = new PrintStream(s.getInputStream());PrintStream out = new PrintStream(s.getOutputStream(),true);String line = null;while (!(line = br.readLine()).equals("over")){//out.write(line);//out.newLine();//out.flush();out.println(line);String up = in.readLine();System.out.println(up);}s.close();}}class ServerTransText {public static void main(String[] args) throws Exception{//创建Socket服务，连接主机和端口ServerSocket ss = new ServerSocket(10005);Socket s = ss.accept();//通过accept获取连接过来的客户端对象BufferedReader in = new BufferedReader(new InputStreamReader(s.getInputStream()));//BufferedWriter out = new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));//PrintStream in = new PrintStream(s.getInputStream());PrintStream out = new PrintStream(s.getOutputStream(),true);String ip = s.getInetAddress().getHostAddress();System.out.println(ip+":....");String line = null;while ((line = in.readLine())!=null){System.out.println(line);/*out.write(line.toUpperCase());out.newLine();out.flush();*/out.println(line.toUpperCase());}s.close();ss.close();}}/*例子的问题：现象：客户端和服务端都在莫名的等待。原因：客户端和服务端都有阻塞方法，这些方法都没读到结束标记。因此双方同时一直等待对方*///客户端的close()方法在结束是会给服务端发-1，用于服务端结束程序。/*23-14*/import java.net.*;import java.io.*;class ClientUpdataText{public static void main(String[] args) throws Exception{//创建Socket服务，连接主机和端口Socket s = new Socket("122.244.71.219",10006);BufferedReader br = new BufferedReader(new FileReader("ChatDemo.java"));PrintStream out = new PrintStream(s.getOutputStream(),true);String line = null;while ((line = br.readLine())!=null){out.println(line);}//out.println("over");s.shutdownOutput();BufferedReader in = new BufferedReader(new InputStreamReader(s.getInputStream()));String str = in.readLine();//????????????这里怎么会出错呢？与视频上没什么不同，疑惑！！！//原因是 服务端的PrintStream 不能传字符流，要把它改为 PrintWriter。System.out.println(str);br.close();s.close();}}class ServerUpdataText {public static void main(String[] args) throws Exception{//创建Socket服务，连接主机和端口ServerSocket ss = new ServerSocket(10006);Socket s = ss.accept();//通过accept获取连接过来的客户端对象BufferedWriter bw = new BufferedWriter(new FileWriter("ChatDemo.txt"));BufferedReader in = new BufferedReader(new InputStreamReader(s.getInputStream()));//PrintStream out = new PrintStream(s.getOutputStream(),true);String ip = s.getInetAddress().getHostAddress();System.out.println(ip+":....");String line = null;while ((line = in.readLine())!=null){//if (line.equals("over"))//break;bw.write(line);bw.newLine();bw.flush();//System.out.println(line);/*out.write(line.toUpperCase());out.newLine();out.flush();*/}//PrintStream out = new PrintStream(s.getOutputStream(),true);PrintWriter out = new PrintWriter(s.getOutputStream(),true);out.println("上传成功");bw.close();ss.close();s.close();}}/*例子的问题：现象：客户端和服务端都在莫名的等待。原因：客户端和服务端都有阻塞方法，这些方法都没读到结束标记。因此一直等待*///客户端的close()方法在结束是会给服务端发-1，用于服务端结束程序。

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