最近在做物联网项目,需要使用TCP和传感器进行双向交互,通过这种渠道,找到了下面的代码,写成博客主要也是为了记录一下,以后用到随时可以看。

代码实现

服务端

package com.tcp;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.io.OutputStreamWriter;

import java.io.PrintWriter;

import java.io.ObjectInputStream.GetField;

import java.net.ServerSocket;

import java.net.Socket;

import java.util.ArrayList;

import java.util.List;

import java.util.concurrent.ExecutorService;

import java.util.concurrent.Executors;

public class TalkServer {

public static int i = 0;

private static final int PORT = 9620; // 端口号

private static List user_list = new ArrayList(); // 保存连接对象

private ExecutorService exec;//线程池

private ServerSocket server;//用来监听端口

public static void main(String[] args) {

// 启动服务器程序

new TalkServer();

}

public TalkServer() {

try {

server = new ServerSocket(PORT);

// 创建一个可根据需要创建新线程的线程池，但是在以前构造的线程可用时将重用它们

exec = Executors.newCachedThreadPool();

System.out.println("服务器已启动！");

Socket client = null;

while (true) {

client = server.accept(); // 接收客户连接

user_list.add(client);// 将用户添加进列表

System.out.println("端口号为： " + user_list.get(i).getPort());// 输出用户端口号

i++;// 列表下标加一

exec.execute(new s_talk(client));//运行s_talk方法

}

} catch (IOException e) {

e.printStackTrace();

}

}

static class s_talk implements Runnable {

private Socket socket;

private InputStream is = null;//输入流

private OutputStream os = null;//输出流

private String msg;

public s_talk(Socket socket) throws IOException {

this.socket = socket;

is = this.socket.getInputStream();

msg = "【" + this.socket.getPort() + "】进入聊天室！当前聊天室有【"+ user_list.size() + "】人"+"(";

for(Socket st:user_list){

msg+=st.getPort()+",";

}

msg+=")";

System.out.println(msg);

for (Socket client : user_list) {

os = client.getOutputStream();

os.write(msg.getBytes());//把在线人数信息输出到每个客户端

}

}

public void run() {

try {

int len;

byte[] b = new byte[1024];//字节

while ((len = is.read(b)) != -1) {

msg = new String(b, 0, len);//将数据存储到msg

//私聊判定

if (msg.indexOf("@") != -1) {

int n = 0;

String stt = null;

for (n = 0; n < user_list.size() - 1; n++) {

stt = "" + user_list.get(n).getPort();//将端口号转换为字符串类型

if (msg.indexOf(stt) != -1) {

break;//没找到此端口号，跳出循环

}

}

String Str = null;

int duan = socket.getPort();

String st = "" + duan;

int num1 = st.length();//端口号长度

int num = msg.length();

Str = msg.substring(num1 + 1, num);

os = user_list.get(n).getOutputStream();//将信息存入输出流

os.write((socket.getPort() + "对我说:" + Str).getBytes());//打印出私聊信息

//System.out.println("私聊接收端口"+user_list.get(n).getPort());//在服务器显示私聊端口号及其数据

System.out.println(socket.getPort() +"对"+user_list.get(n).getPort()+ "发送的私聊消息："+ "发送的数据-------" + Str);

} else

{

//判定退出，trim()用于去掉开头和结尾的空格

if (msg.trim().equals("bye")) {

user_list.remove(socket);// 删除一个元素

is.close();//关闭输入输出流

os.close();

msg = "【" + socket.getPort()+ "】离开聊天室！当前聊天室有【" + user_list.size()+ "】人";

socket.close();

System.out.println(msg);

for (Socket client : user_list) {

os = client.getOutputStream();

os.write(msg.getBytes());

}

break;

} else

{ //群聊

msg = "【" + socket.getPort() + "】说：" + msg;

System.out.println(msg);

for (Socket client : user_list) {

os = client.getOutputStream();

os.write(msg.getBytes());

}

}

}

}

} catch (IOException e) {

e.printStackTrace();

}

}

}

}

客户端

package com.tcp;

import java.io.BufferedReader;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.io.PrintStream;

import java.io.PrintWriter;

import java.net.InetAddress;

import java.net.Socket;

import java.util.Scanner;

import java.util.concurrent.ExecutorService;

import java.util.concurrent.Executors;

public class TalkClient {

public static String ip = "127.0.0.1";

private static final int PORT = 9620;

private static ExecutorService exec = Executors.newCachedThreadPool(); // 线程池

public static void main(String[] args) throws Exception {

// 启动客户端函数

new TalkClient();

}

public TalkClient() {

try {

Socket socket = new Socket(ip, PORT); // 连接端口

exec.execute(new c_send(socket));// 启动客户端线程

System.out.println("【" + socket.getLocalAddress() + "】您好,欢迎来到神华客户端！");

InputStream is = null;

is = socket.getInputStream();// 创建输入流

String msg;

int len;

byte[] b = new byte[1024];

while ((len = is.read(b)) != -1) {

msg = new String(b, 0, len);// 将消息存入字节数组并赋给msg

System.out.println(msg);

}

} catch (Exception e) {

e.printStackTrace();

}

}

class c_send implements Runnable {

private Socket socket;// 定义套接字

public c_send(Socket socket) {

this.socket = socket;

}

public void run() {

try {

InputStream is = null;

is = socket.getInputStream();// 获取输入输出流

OutputStream os = null;

os = socket.getOutputStream();

String msg;

while (true) {

String stt = null;

Scanner sc = new Scanner(System.in);// 输入欲发送的信息

msg = sc.next();// 把值返回给msg并打印

os.write(msg.getBytes());

if (msg.trim().equals("bye")) {

is.close();

os.close();

exec.shutdownNow();//关闭线程池

break;

}

}

} catch (Exception e) {

e.printStackTrace();

}

}

}

}

实现效果

客户端

服务端

以上代码经过本地测试。