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滴水穿石-13 网络编程

1 UPD协议发送和接收

1.1 基础版

package d13;

import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;


/*
 * 创建stock对象
 * 打包数据
 * 发送数据
 * 释放数据
 * */
public class UDP_Send {
    public static void main(String[] args) throws Exception {
        //01 创建对象
        DatagramSocket ds = new DatagramSocket();
        //02 打包数据  DatagramPacket(byte[] buf, int length, InetAddress address, int port) 
        byte [] contentStr = "Hello Word !!".getBytes();
        int lengthInt = contentStr.length;
        InetAddress ip =  InetAddress.getByName("192.168.2.117");
        int portInt = 10086;
        DatagramPacket dp = new DatagramPacket(contentStr,lengthInt,ip,portInt);
        //03 发送数据
        ds.send(dp);
        //04 释放资源
        ds.close();
    }
    
}

UDP_Send

package d13;

import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;


/*
 * 创建stock对象
 * 创建数据包对象
 * 接收数据
 * 解析数据
 * 释放数据
 * */
public class UDP_Receive {
    public static void main(String[] args) throws Exception {
        //01 创建对象
        int portInt = 10086;
        DatagramSocket ds = new DatagramSocket(portInt);
        //02 打包数据  DatagramPacket(byte[] buf, int length) 
        byte[] buf = new byte[1024];
        int lengthInt = 1024;    
        DatagramPacket dp = new DatagramPacket(buf,lengthInt);
        
        //03 发送数据
        ds.receive(dp);
        //04 解析数据
        String ip = dp.getAddress().getHostAddress();
        byte[] contentByte = dp.getData();
        int len = dp.getLength();
        String strContent = new String(contentByte,0,len); 
        System.out.println(ip+": "+strContent);
        //05 释放资源
        ds.close();
    }
    
}

UDP_Receive

1.2 改进版,键盘录入

package d13;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;


/*
 * 创建stock对象
 * 打包数据
 * 发送数据
 * 释放数据
 * */
public class UDP_Send {
    public static void main(String[] args) throws Exception {
        //01 创建对象
        DatagramSocket ds = new DatagramSocket();
        //02 打包数据  DatagramPacket(byte[] buf, int length, InetAddress address, int port) 
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String line = null;
        while ((line = br.readLine()) != null) {
            if ("886".equals(line)) {
                break;
            }  
            byte [] contentStr =line.getBytes();
            int lengthInt = contentStr.length;
            InetAddress ip =  InetAddress.getByName("192.168.2.117");
            int portInt = 10086;
            DatagramPacket dp = new DatagramPacket(contentStr,lengthInt,ip,portInt);
            //03 发送数据
            ds.send(dp);
        }
         
        //04 释放资源
        ds.close();
    }
    
}

UDP_Send2.0

2 TCP协议发送和接收数据

2.1 基础版

package d13;

import java.io.IOException;
import java.io.OutputStream;
import java.net.Socket;
import java.net.UnknownHostException;

/*TCP协议发送数据:
 * A:创建发送端的Stock
 * B:获取输出流,写数据
 * C:释放资源
 * */
public class TCP_Client {

    public static void main(String[] args) throws Exception {
        // A:创建发送端的Stock
        Socket s = new Socket("192.168.2.117",10087);
        //B:获取输出流,写数据
        OutputStream os = s.getOutputStream();
        os.write("Hello Word !!".getBytes());
        //释放资源
        s.close();
    }

}

TCP_Client

package d13;


import java.io.IOException;
import java.io.InputStream;
import java.net.ServerSocket;
import java.net.Socket;

/*
 *创建服务端的Socket对象
 *监听客户端连接,返回一个Socket对象
 *获取输入流 并显示在控制台
 *释放资源
 * */
public class TCP_Server {
    public static void main(String[] args) throws Exception {
        //创建服务端的Socket对象
                ServerSocket s = new ServerSocket(10087);
                //监听客户端连接,返回一个Socket对象
                Socket ss = s.accept();
                //获取输入流 并显示在控制台
                InputStream is = ss.getInputStream();
                
                byte [] bys = new byte[1024];
                int len = is.read(bys);
                String str = new String(bys,0,len);
                String ip = ss.getInetAddress().getHostAddress();
                System.out.println(ip+": "+str);
                 
                //释放资源
                ss.close();
    }
 
}

TCP_Server

2.2 服务器端收到消息后反馈给客户端

package d13;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.net.UnknownHostException;

/*TCP协议发送数据:
 * A:创建发送端的Stock
 * B:获取输出流,写数据
 * C:释放资源
 * */
public class TCP_Client {

    public static void main(String[] args) throws Exception {
        // A:创建发送端的Stock
        Socket s = new Socket("192.168.2.117",10087);
        //B:获取输出流,写数据
        OutputStream os = s.getOutputStream();
        os.write("Hello Word !!".getBytes());
        //C 接收服务器端发送来的数据
        InputStream is = s.getInputStream();
        byte [] by = new byte[1024];
        int len = is.read(by);
        String ms=new String(by,0,len);
        
        System.out.println(ms);
        //释放资源
        s.close();
    }

}

TCP_Client

package d13;


import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

/*
 *创建服务端的Socket对象
 *监听客户端连接,返回一个Socket对象
 *获取输入流 并显示在控制台
 *释放资源
 * */
public class TCP_Server {
    public static void main(String[] args) throws Exception {
        //创建服务端的Socket对象
                ServerSocket s = new ServerSocket(10087);
                //监听客户端连接,返回一个Socket对象
                Socket ss = s.accept();
                //获取输入流 并显示在控制台
                InputStream is = ss.getInputStream();
                
                byte [] bys = new byte[1024];
                int len = is.read(bys);
                String str = new String(bys,0,len);
                String ip = ss.getInetAddress().getHostAddress();
                System.out.println(ip+": "+str);
                 
                //创建输出流,将消息反馈给客户端
                OutputStream os = ss.getOutputStream();
                os.write("信息已收到!!".getBytes());
                //释放资源
                ss.close();
    }
 
}

TCP_Server

2.3 键盘录入+高效流

package d13;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.Socket;
import java.net.UnknownHostException;

/*TCP协议发送数据:
 * A:创建发送端的Stock
 * B:获取输出流,写数据
 * C:释放资源
 * */
public class TCP_Client {

    public static void main(String[] args) throws Exception {
        // A:创建发送端的Stock
        Socket s = new Socket("192.168.2.117",10087);
        //B:获取输出流,写数据
        OutputStream os = s.getOutputStream();
        //键盘录入数据
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        //把通道内的流给包装一下
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
        String line =null;
        while ((line=br.readLine())!=null) {
            if ("886".equals(line)) {
                break;
            }
            bw.write(line);
            bw.newLine();
            bw.flush();
             
        }
          
        //释放资源
     
        s.close();
    }

}

TCP_Client

package d13;


import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

/*
 *创建服务端的Socket对象
 *监听客户端连接,返回一个Socket对象
 *获取输入流 并显示在控制台
 *释放资源
 * */
public class TCP_Server {
    public static void main(String[] args) throws Exception {
                //创建服务端的Socket对象
                ServerSocket ss = new ServerSocket(10087);
                //监听客户端连接,返回一个Socket对象
                Socket s = ss.accept();
                //获取输入流 并显示在控制台
                BufferedReader br = new BufferedReader(new InputStreamReader(s.getInputStream()));
                String line = null;
                while ((line=br.readLine())!=null) {
                    //String ip = ss.getInetAddress().getHostAddress();
                    System.out.println(line);
                }
             
                 
                //释放资源
                s.close();
    }
 
}

TCP_Server

2.4 键盘录入+输出到文本文件

package d13;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.Socket;

/*
 * 客户端键盘录入,服务器输出到文本文件*/
public class TCP_Client2 {
    public static void main(String[] args) throws IOException {
        //创建客户端Socket对象
        Socket s = new Socket("192.168.2.117",23466);
        //键盘录入
        BufferedReader br = new BufferedReader (new InputStreamReader(System.in));
        //封装通道内的数据
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
        
        String line =null;
        while ((line=br.readLine())!=null) {
            if ("over".equals(line)) {
                break;
            }
            bw.write(line);
            bw.newLine();
            bw.flush();
        }
        s.close();
    }
}

TCP_Client2

package d13;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;

/*
 * 客户端键盘录入,服务器输出到文本文件*/
public class TCP_Server2 {
    public static void main(String[] args) throws IOException {
        //创建服务器Socket对象
        ServerSocket ss = new ServerSocket(23466);
        
        //监听客户端创建
        Socket s = ss.accept();
        
        //从通道中来到文件中去
        BufferedReader br = new BufferedReader(new InputStreamReader(s.getInputStream()));
        //封装文本文件
        BufferedWriter bw = new BufferedWriter (new FileWriter("b.txt"));
        String line = null;
        while ((line=br.readLine())!=null) {
             bw.write(line);
             bw.newLine();
             bw.flush();
        }
        bw.close();
    }
}

TCP_Server2

2.5 文本文件录入+控制台输出

package d13;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.Socket;
import java.net.UnknownHostException;

/*
 * 读取文本文件,输出到控制台*/
public class TCP_Client3 {
    public static void main(String[] args) throws IOException {
        //创建Socket对象
        Socket s = new Socket("192.168.2.117",10087);
        
        //封装文本文件
        BufferedReader br = new BufferedReader(new FileReader("b.txt"));
        //封装通道内的流
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
        
        String line = null;
                
        while ((line = br.readLine())!=null) {
            bw.write(line);
            bw.newLine();
            bw.flush();    
        }
        br.close();
        s.close();
        
    }
}

TCP_Client3

package d13;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;

public class TCP_Server3 {

    public static void main(String[] args) throws IOException {
        //创建服务器对象
        ServerSocket ss = new ServerSocket(10087);
        //监听客户端
        Socket s = ss.accept();
        //从通道中来
        BufferedReader br = new BufferedReader(new InputStreamReader(s.getInputStream()));
        //到控制台
        String line = null;
        while ((line=br.readLine())!=null) {
             System.out.println(line);
        }
        s.close();
    }

}

TCP_Server3

2.6 文本文件录入+文本文件输出

package d13;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.Socket;
import java.net.UnknownHostException;

public class TCP_Client4 {

    public static void main(String[] args) throws IOException {
        // 创建Socket对象
        Socket s = new Socket("192.168.2.117", 10088);
        // 创建读取流
        BufferedReader br = new BufferedReader(new FileReader("b.txt"));
        // 创建文件输出流
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
        String line = null;
        while ((line = br.readLine()) != null) {
            bw.write(line);
            bw.newLine();
            bw.flush();
        }
        //Socket通知服务器,已经结束了
        bw.write("over");
        s.shutdownOutput();
        // 接收反馈
        BufferedReader brclient = new BufferedReader(new InputStreamReader(s.getInputStream()));
        String msg = brclient.readLine();
        System.out.println(msg);
        // 释放资源
        br.close();
        s.close();

    }

}

TCP_Client4

package d13;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.ServerSocket;
import java.net.Socket;

public class TCP_Server4 {
    public static void main(String[] args) throws IOException {
         //创建服务器对象
        ServerSocket ss = new ServerSocket(10088);
        //创建监听
        Socket s = ss.accept();
        //从通道中来
        BufferedReader br = new BufferedReader(new InputStreamReader(s.getInputStream()));
        //到文件中
        BufferedWriter bw = new BufferedWriter(new FileWriter("a.txt"));
        
        String line = null;
        while ((line=br.readLine())!=null) {
             
            bw.write(line);
            bw.newLine();
            bw.flush();
            
        }
        //发出成功消息
        BufferedWriter bwServer = new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
        bwServer.write("文件上传成功");
        bwServer.newLine();
        bwServer.flush();
        //bwServer.close();
        //释放资源
        bw.close();
        s.close();
    }
}

TCP_Server4

2.7 图片文件录入+图片文件输出

package d13;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.ServerSocket;
import java.net.Socket;

//上传图片,并保存
public class TCP_Client5 {
    public static void main(String[] args) throws IOException {
        //创建Socket对象
        Socket s = new Socket("192.168.2.117", 10090);
        //读取图片图片
        BufferedInputStream bi = new BufferedInputStream(new FileInputStream("a.png"));
        byte [] by = new byte[1024];
        //向通道中写数据
        BufferedOutputStream bo = new BufferedOutputStream(s.getOutputStream());
        int len =0;
        
        while ((len=bi.read(by))>0) {
            bo.write(by,0,len);        
            bo.flush();
        }
        //通知服务器传输结束
        s.shutdownOutput();
        
        //结束服务器传来的反馈
        InputStream biServer =  s.getInputStream();
        len= biServer.read(by);
        String msg =new String(by,0,len);
        System.out.println(msg);
         
        s.close();
        
    }
}

TCP_Client5

package d13;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class TCP_Server5 {
    public static void main(String[] args) throws IOException {
        // 创建服务端Socket
        ServerSocket ss = new ServerSocket(10090);
        // 监听客户端
        Socket s = ss.accept();
        // 从通道中来
        BufferedInputStream bi = new BufferedInputStream(s.getInputStream());
        // 到文件中去
        byte [] by = new byte[1024];
        BufferedOutputStream bo = new BufferedOutputStream(new FileOutputStream("b.png"));
        int len =0;
        while ((len=bi.read(by))!=-1) {
            bo.write(by,0,len);
        }
        //给客户端个反馈
        OutputStream bs = s.getOutputStream();
        bs.write("图片上传成功!".getBytes()); 
        bo.close();
        s.close();
    }
}

TCP_Server5

3 一个服务器+多个客户端(多线程)

package d13;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class TCP_Server5 {
    public static void main(String[] args) throws IOException {
        // 创建服务端Socket
        ServerSocket ss = new ServerSocket(10090);
        while (true) {
            // 监听客户端
            Socket s = ss.accept();
              new Thread(new UserThread(s)).start();    
        }
        
    }
}

TCP_Server5

package d13;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.net.Socket;

public class UserThread implements Runnable {

    private Socket s;
    public UserThread(Socket s) {
        this.s=s;
    }
    @Override
    public void run() {
        // TODO Auto-generated method stub
        try {
            // 从通道中来
            BufferedInputStream bi = new BufferedInputStream(s.getInputStream());
            // 到文件中去
            byte [] by = new byte[1024];
            String newName =System.currentTimeMillis()+".png";
            BufferedOutputStream bo = new BufferedOutputStream(new FileOutputStream(newName));
            int len =0;
            while ((len=bi.read(by))!=-1) {
                bo.write(by,0,len);
            }
            //给客户端个反馈
            OutputStream bs = s.getOutputStream();
            bs.write("图片上传成功!".getBytes()); 
            bo.close();
            s.close();
        } catch (Exception e) {
            // TODO: handle exception
        }
    }

}

UserThread

package d13;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.ServerSocket;
import java.net.Socket;

//上传图片,并保存
public class TCP_Client5 {
    public static void main(String[] args) throws IOException {
        //创建Socket对象
        Socket s = new Socket("192.168.2.117", 10090);
        //读取图片图片
        BufferedInputStream bi = new BufferedInputStream(new FileInputStream("a.png"));
        byte [] by = new byte[1024];
        //向通道中写数据
        BufferedOutputStream bo = new BufferedOutputStream(s.getOutputStream());
        int len =0;
        
        while ((len=bi.read(by))>0) {
            bo.write(by,0,len);        
            bo.flush();
        }
        //通知服务器传输结束
        s.shutdownOutput();
        
        //结束服务器传来的反馈
        InputStream biServer =  s.getInputStream();
        len= biServer.read(by);
        String msg =new String(by,0,len);
        System.out.println(msg);
         
        s.close();
        
    }
}

TCP_Client5

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原文地址：https://www.cnblogs.com/YK2012/p/8732748.html