Java TCP套接字编程（一）简单文字传输

客户端：

1. 连接服务器 Socket
2. 发送消息 IO流

package com.zzz.net;

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

public class TcpClientDemo01 {
    public static void main(String[] args) {
        Socket socket = null;
        OutputStream os = null;
        try {
            InetAddress serverIP  = InetAddress.getByName("127.0.0.1");//要知道服务器的地址与端口号
            int port = 8080;
            socket = new Socket(serverIP,port);//创建一个socke连接
            os = socket.getOutputStream();//发送消息 IO流
            os.write("你好！".getBytes());

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            //关闭资源
            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：

1. 建立服务器的端口 ServerSocket
2. 等待用户连接 accept
3. 接受用户的消息 IO流

package com.zzz.net;

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

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

        try {
            serverSocket = new ServerSocket(8080);  //自己得有一个地址
            while (true) {
                socket = serverSocket.accept();     //等待客户端连接
                is = socket.getInputStream();       //读取客户端信息
                baos = new ByteArrayOutputStream(); //管道流
                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();
                }
            }
        }

    }
}