[网络协议]Java学习(尚硅谷)网络编程学习之实现TCP网络编程的三个例子

package com.atguigu.java1;

import org.junit.Test;

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

/**
 * 实现TCP的网络编程
 * 例子1：客户端发送一句话给服务端，服务端将数据显示在控制台上
 * @author 
 * @create 2022-05-03-14:44
 */
public class TCPTest {
    //客户端
    @Test
    public void client()  {
        Socket socket = null;
        OutputStream os = null;
        try {
            //1.创建Socket对象，指明服务器端的ip和端口号
            InetAddress inet1 = InetAddress.getByName("127.0.0.1");
            socket = new Socket(inet1,8899);
            //2.获取一个输出流，用于输出数据
            os = socket.getOutputStream();
            //3.写出数据操作
            os.write("你好，我是客户端".getBytes());
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            //4.资源的关闭
            if (os!=null){

                try {
                    os.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (socket!=null){

                try {
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    //服务端
    @Test
    public void server(){
        ServerSocket serverSocket = null;
        Socket socket = null;
        InputStream is = null;
        ByteArrayOutputStream baos = null;
        try {
            //1.创建服务器端的ServerSocket，指明自己的端口号
            serverSocket = new ServerSocket(8899);
            //2.调用accept()表示接受来自客户端的socket
            socket = serverSocket.accept();
            //3.获取输入流
            is = socket.getInputStream();

            //不建议这样写，可能会有乱码
//        byte[] buffer=new byte[1024];
//        int len;
//        while ((len=is.read(buffer))!=-1){
//            String str = new String(buffer,0,len);
//            System.out.print(str);
//        }
            //4.读取输入流中的数据
            baos = new ByteArrayOutputStream();
            byte[] buffer=new byte[5];
            int len;
            while ((len=is.read(buffer))!=-1){
                baos.write(buffer,0,len);
            }
            System.out.println(baos.toString());

            System.out.println("收到了来自于"+socket.getInetAddress().getHostAddress()+"的数据");
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            //5.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.atguigu.java1;

import org.junit.Test;

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

/**
 * 实现TCP的网络编程
 * 例题2：客户端发送文件给服务端，服务端将文件保存在本地
 *
 * @author 
 * @create 2022-05-03-15:25
 */
public class TCPTest2 {
    /*
    这里涉及到的异常应该使用try-catch-finally处理
     */

    @Test
    public void client() throws IOException {
        //1.
        Socket socket = new Socket(InetAddress.getByName("127.0.0.1"),9090);
        //2.
        OutputStream os = socket.getOutputStream();
        //3.
        FileInputStream fis = new FileInputStream(new File("CSDN封面图.jpg"));
        //4.
        byte[] buffer=new byte[1024];
        int len;
        while ((len=fis.read(buffer))!=-1){
            os.write(buffer,0,len);
        }
        //5.
        fis.close();
        os.close();
        socket.close();
    }

    @Test
    public void server() throws IOException {
        //1.
        ServerSocket serverSocket = new ServerSocket(9090);
        //2.
        Socket socket = serverSocket.accept();
        //3.
        InputStream is = socket.getInputStream();
        //4.
        FileOutputStream fos = new FileOutputStream(new File("file1.jpg"));
        //5.
        byte[] buffer=new byte[1024];
        int len;
        while ((len=is.read(buffer))!=-1){
            fos.write(buffer,0,len);
        }
        //6.
        fos.close();
        is.close();
        socket.close();
        serverSocket.close();


    }
}

package com.atguigu.java1;

import org.junit.Test;

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

/**
 * 实现TCP网络编程
 * 例题3：从客户端发送文件给服务端，服务端保存到本地，并返回“发送成功”给客户端，并关闭相应的连接
 * @author 
 * @create 2022-05-03-15:48
 */
public class TCPTest3 {


    /*
    这里涉及到的异常应该使用try-catch-finally处理
     */

    @Test
    public void client() throws IOException {
        //1.
        Socket socket = new Socket(InetAddress.getByName("127.0.0.1"),9090);
        //2.
        OutputStream os = socket.getOutputStream();
        //3.
        FileInputStream fis = new FileInputStream(new File("CSDN封面图.jpg"));
        //4.
        byte[] buffer=new byte[1024];
        int len;
        while ((len=fis.read(buffer))!=-1){
            os.write(buffer,0,len);
        }
        //关闭数据的输出，如果不关闭，服务器端一直都在等待传输数据
        socket.shutdownOutput();
        //5.接受来自于服务器端的数据，并显示到控制台上
        InputStream is = socket.getInputStream();
        ByteArrayOutputStream baos=new ByteArrayOutputStream();
         byte[] buffer1=new byte[20];
         int len1;
         while ((len1=is.read(buffer1))!=-1){
             baos.write(buffer1,0,len1);

         }
        System.out.println(baos.toString());
        //6.
        baos.close();
        fis.close();
        os.close();
        socket.close();
    }

    @Test
    public void server() throws IOException {
        //1.
        ServerSocket serverSocket = new ServerSocket(9090);
        //2.
        Socket socket = serverSocket.accept();
        //3.
        InputStream is = socket.getInputStream();
        //4.
        FileOutputStream fos = new FileOutputStream(new File("file2.jpg"));
        //5.
        byte[] buffer=new byte[1024];
        int len;
        while ((len=is.read(buffer))!=-1){
            fos.write(buffer,0,len);
        }

        //6服务器端给与客户端反馈

        OutputStream os = socket.getOutputStream();
        os.write("你好，客户端，你的文件已经收到".getBytes());
        //7.

        os.close();
        fos.close();
        is.close();
        socket.close();
        serverSocket.close();


    }
}

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