实训23 2018.4.27

//UDPClient.java

import java.net.*;

public class UDPClient{
  public static void main(String [] args)throws Exception{
    //1.创建数据包传输对象DatagramSocket
    DatagramSocket ds=new DatagramSocket(8888);
    //2.创建字节数组，接收传来的对象
    byte[] b=new byte[1024];
    //3.创建数据包对象
    DatagramPacket dp=new DatagramPacket(b,b.length);
    //4.调用receive方法接收数据包
    ds.receive(dp);
    //5.拆包
    //(1)获取ip地址
    String ip=dp.getAddress().getHostAddress();
    //(2)获取端口号
    int port =dp.getPort();
    //（3）获取数据长度
    int length=dp.getLength();
    System.out.println(ip+":"+port+" "+new String(b,0,length));
    //6.关闭资源
    ds.close();
  }
}

//UDPSend.java

import java.net.*;
import java.util.Scanner;

public class UDPSend{
  public static void main(String []args)throws Exception{
    InetAddress inet=InetAddress.getByName("127.0.0.1");
    DatagramSocket ds=new DatagramSocket();
    String mes=new Scanner(System.in).next(Line();
    byte[] b =mes.getBytes();
    DatagramPacket dp=new DatagramPacket(b,b.length,inet,8888);
    ds.send(dp);
    ds.close();
  }
}

//TCPClient.java

import java.io.*;
import java.net.*;

public class TCPClient{
  public static void main(String [] args)throws Exception{
    //1.创建Socket对象，连接服务器
    Socket socket=new Socket("127.0.0.1",8888);
    //2.通过客户端的套接字对象，调用获取输出流方法，将数据写向服务器
    OutputStream out=socket.getOutputStream();
    out.write("server".getBytes());
    //接收服务器端回复
    InputStream in =socket.getInputStream();
    byte[] b=new byte[1024];
    int len=in.read(b);
   System.out.print(socket.getInetAddress+":"+socket.getPort()+" "+new String(b,0,len));
   //3.关闭资源
   socket.close();
  }
}

//TCPServer.java
public class TCPServer{
  public static void main(String [] args)throws Exception{
    //1.创建服务器对象
    ServerSocket socketServer=new ServerSocket(8888);
    //2.调用accept方法接收客户端socket
    Socket socket=secketServer.accept();
    //3.获取输入流
    InputStream in =socket.getInputStream();
    //4.读取信息
    byte[] b=new byte[1024];
    int len =in.read(b);
    System.out.println(socket.getInetAddress()+":"+socket.getPort()+" "+new String(b,0,len));
    //回复信息
    OutputStream os=socket.getOutputStream();
    os.writer("received".getBytes());
    //5.关闭资源
    in.close;
    socket.close();
    serverSocket.close();
  }
}

//TCPPictureClient.java

import java.io.*;
import java.net.*;

public class TCPPictureClient(){
  public static void main(String [] args)throws Exception{
    Socket socket=new Socket("127.0.0.1",8888);
    FileInputStream fis=new FileInputStream("F:\\0.jpg");
    int i=0;
    byte[] b=new byte[1024];
    OutputStream out=socket.getOutputStream();
    while((i=fis.read(b))!=-1){
      out.write(b,0,i);
    }
    socket.shutdownOutput();
    InputStream in=socket.getInputStream();
    byte[] bs=new byte[1024];
    int len=in.read(bs);
    System.out.println(socket.getInetAddress() + ":" + socket.getPort() );
    
    socket.close();
    fis.close();
    in.close();
  }
}

//TCPThread.java

import java.io.*;
import java.net.*;

public class TCPThread{
  public static void main(String [] args)throws Exception{
    while(true){
    ServerSocket =new ServerSocket(8888);
    new Thread(new Upload(socket)).start();
    }
  }
}

class Upload implements Runnable{
  private Socket socket;
  public Upload(Socket socket){
    this.socket=socket;
  }
  
  public void run(){
  //这里需要处理异常，但是我没有
    try{
      InputStream in=socket.getInputStream();
      FileOutputStream fos=new FileOutputStream("G:\\a"+System.currentTimeMillis()+".jpg");
      byte[] b = new byte[1024];
            int len = 0;
            while ((len = in.read(b)) != -1) {
                fos.write(b, 0, len);
            }
      System.out.println(socket.getInetAddress() + ":" + socket.getPort());
            OutputStream os = socket.getOutputStream();
            os.write("received".getBytes());

            in.close();
            fos.close();
            socket.close();
    }catch(Exception e){
      throw new RuntimeException();
    }
  }
}