网络编程—TCP

网络编程—TCP

客户端

1. 连接服务器 Socket
2. 发送消息

package com.deng.lesson02;

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

//客户端
public class TcpClientDemo01 {
    public static void main(String[] args) {
        Socket socket = null;
        OutputStream os = null;
        try {
            //1.知道服务器地址,  端口号
            InetAddress serverIP = InetAddress.getByName("127.0.0.1");
            int port = 9999;
            //2.创建一个socket连接
            socket = new Socket(serverIP, port);
            //3.发送消息  IO流
            os = socket.getOutputStream();
            os.write("你好，欢迎光临".getBytes());

        } catch (Exception 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();
                 }
                }
            }
        }
    }
}

服务器

1. 建立服务器的端口 ServerSocket
2. 等待用户连接 accept
3. 接收消息

package com.deng.lesson02;

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

//服务器
public class TcpServerDemo01 {
    public static void main(String[] args) {
        ServerSocket serverSocket = null;
        Socket socket = null;
        InputStream is = null;
        ByteArrayOutputStream baos = null;

        try {
            //1.要有一个地址
            serverSocket = new ServerSocket(9999);
            while (true){
            //2.等待客户端连接过来
             socket = serverSocket.accept();
             //3.读取客户端的消息
             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());
            }

            /**
             byte[] buffer =new byte[1024];
             int len;
             while ((len=is.read(buffer))!=-1){
                 String msg = new String (buffer,0,len);
                 System.out.println(msg);
             }
             */


        } 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();
             }
         }
       }
    }
}

文件上传

客户端

package com.deng.lesson02;

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

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("tu.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，已经接受
        socket.shutdownOutput();//已经传输完毕

        //确定服务器接收完毕，断开连接
        InputStream inputStream = socket.getInputStream();
        //String  byte[]
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        byte[] buffer2 = new byte[1024];
        int len2;
        while ((len2=inputStream.read(buffer2))!=-1){
            baos.write(buffer2,0,len2);
        }
        System.out.println(baos.toString());

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

服务端

package com.deng.lesson02;

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

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.文件输输出
        FileOutputStream fos = new FileOutputStream("receive.jpg");
        byte[] buffer = new byte[1024];
        int len;
        while ((len=is.read(buffer))!=-1){
            fos.write(buffer,0,len);
        }

        //通知客户端接收完毕
        OutputStream os = socket.getOutputStream();
        os.write("接受完毕，断开连接".getBytes());

        //5.关闭资源
        fos.close();
        is.close();
        socket.close();
        serverSocket.close();

    }
}

Tomcat

• 服务端： 自定义S Tomcat服务器S
• 客户端： 自定义S 浏览器B