Java学习之路--网络编程相关02

package com.kuang.lesson02;

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

//客户端 2023.3.4 TCP 建立客户端和服务端 实现信息发送功能
public class TcpClientDemo01 {
    public static void main(String[] args) {

        Socket socket = null;
        OutputStream os = null;

        //1.要知道服务器的地址,端口号
        try {
            InetAddress serverIP = InetAddress.getByName("127.0.0.1");
            int port = 9999;
            //2.创建一个socket连
            socket = new Socket(serverIP,port);
            //3.发送消息 IO流
            os = socket.getOutputStream();
            os.write("你好,欢迎学习Java".getBytes());
        } catch (UnknownHostException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (os != null){
                try {
                    os.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (socket != null){
                try {
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

//

package com.kuang.lesson02;

import java.io.*;
import java.net.InetAddress;
import java.net.Socket;

//2023.3.5 客户端 TCP 实现文件读取和输出 客户端给服务端发文件，服务端收到并做出反馈断开连接
public class TcpClientDemo02 {
    public static void main(String[] args) throws Exception{
        //1.创建一个Socket连接
        Socket socket = new Socket(InetAddress.getByName("127.0.0.1"),9000);
        //2.创建一个输出流
        OutputStream os = socket.getOutputStream();
        //3.读取文件
        FileInputStream fis = new FileInputStream(new File("D:\\Java SE\\基础语法\\src\\com\\kuang\\cat.jpg"));
        //4.写出文件
        byte[] buffer = new byte[1024];
        int len;
        while ((len=fis.read(buffer))!= -1){
            os.write(buffer,0,len);
        }
        //通知服务器我已经结束了
        socket.shutdownOutput();//我已经传输完了
        //确定服务器接收完毕，才能够断开连接
        InputStream inputStream = socket.getInputStream();
        //String byte[]
       ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();

       byte[] buffer2 = new byte[2014];
       int len2;
       while ((len2 = inputStream.read(buffer2)) != -1){
           byteArrayOutputStream.write(buffer2,0,len2);
        }

        System.out.println(byteArrayOutputStream.toString());

        //5.关闭资源
        fis.close();
        os.close();
        socket.close();
    }
}

//

package com.kuang.lesson02;

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

//服务端 3.4
public class TcpServerDemo01 {
    public static void main(String[] args) {
        ServerSocket serverSocket = null;
        Socket socket = null;
        InputStream is = null;
        ByteArrayOutputStream baos = null;
        try {
            //1.我得有一个地址
            serverSocket = new ServerSocket(9999);
            //2.等待客户端连接过来
            socket = serverSocket.accept();
            //3.读取客户端的信息
            is = socket.getInputStream();
            //管道流
            baos = new ByteArrayOutputStream();
            byte[] buffer = new byte[1024];
            int len;
            while ((len = is.read(buffer)) != -1){
                baos.write(buffer,0,len);
            }
            System.out.println(baos.toString());

        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            //关闭资源
            if (baos != null){
                try {
                    baos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (is != null){
                try {
                    is.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (socket != null) {
                try {
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (serverSocket != null){
                try {
                    serverSocket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}
//

package com.kuang.lesson02;

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

//3.5服务端
public class TcpServerDemo02 {
    public static void main(String[] args) throws Exception{
        //1.创建服务
        ServerSocket serverSocket = new ServerSocket(9000);
        //2.监听客户端的连接
        Socket socket = serverSocket.accept();//阻塞式监听，会一直等待客户端连接
        //3.获取输入流
        InputStream is = socket.getInputStream();
        //4.文件输出
        FileOutputStream fos = new FileOutputStream(new File("D:\\Java SE\\基础语法\\src\\com\\kuang\\receive.jpg"));
        byte[] buffer = new byte[1024];
        int len;
        while ((len=is.read(buffer)) != -1){
            fos.write(buffer,0,len);
        }
        //通知客户端我接受完毕了
        OutputStream outputStream = socket.getOutputStream();
        outputStream.write("客户端，我接收完毕，可以断开连接了".getBytes());
        //关闭资源
        fos.close();
        is.close();
        socket.close();
        serverSocket.close();
    }
}