java如何通过tcp发送指令

以下是一个展示java使用tcp通讯的简单例子，包括服务器和客户端代码：

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/**

*TCPServer

*/

import java.io.*;

import java.net.*;

class TCPServer{

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

ServerSocket listen = new ServerSocket(5050);

Socket server = listen.accept();

InputStream in = server.getInputStream();

OutputStream out = server.getOutputStream();

char c = (char)in.read();

System.out.println("收到:" + c);

out.write('s');

out.close();

in.close();

server.close();

listen.close();

}

}

/**

*TCPClient

*/

import java.io.*;

import java.net.*;

class TCPClient{

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

Socket client = new Socket("127.0.0.1" , 5050);

InputStream in = client.getInputStream();

OutputStream out = client.getOutputStream();

out.write('c');

char c = (char)in.read();

System.out.println("收到:" + c);

out.close();

in.close();

client.close();

}

}

java代码TCP/IP网络通信服务器客户端，实现双方信息交互。

package com.weixin.test;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.net.InetAddress;

import java.net.ServerSocket;

import java.net.Socket;

import org.junit.Test;

public class ScoketTest {

@Test

public void client() throws Exception{

InetAddress i=InetAddress.getByName("127.0.0.1");

Socket s=new Socket(i, 9000);

OutputStream outputStream = s.getOutputStream();

outputStream.write("服务端你好,我是客户端哦!".getBytes());

s.shutdownOutput();

InputStream inputStream=s.getInputStream();

int length=0;

byte[] bytes=new byte[1024];

while ((length=inputStream.read(bytes))!=-1) {

System.err.println(new String(bytes,0,length));

}

inputStream.close();

outputStream.close();

s.close();

}

@Test

public void server() throws Exception{

ServerSocket serverSocket=new ServerSocket(9000);

Socket socket = serverSocket.accept();

InputStream inputStream = socket.getInputStream();

OutputStream outputStream = socket.getOutputStream();

int length=0;

byte[] bytes=new byte[1024];

while ((length=inputStream.read(bytes))!=-1) {

System.err.println(new String(bytes, 0,length));

}

outputStream.write("客户端你好，本王已收到!".getBytes());

outputStream.close();

inputStream.close();

socket.close();

serverSocket.close();

}

}

关于java编程。设计一个基于TCP/IP协议的网络程序，实现如下功能：

写好了，有什么问题请追问。

客户端：

import java.net.*;

import java.io.*;

public class TestSocketClient {

public static void main(String[] args) {

try {

Socket socket = new Socket("127.0.0.1", 5566);

System.out.println("请输入计算式：");

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

String s1 = br.readLine();

DataOutputStream dos = new DataOutputStream(socket.getOutputStream());

DataInputStream dis = new DataInputStream(socket.getInputStream());

dos.writeUTF(s1);

dos.flush();

double s = dis.readDouble();

System.out.println("计算结果：" + s);

dis.close();

dos.close();

socket.close();

} catch (IOException e) {

e.printStackTrace();

System.out.println("连接出错");

System.exit(-1);

}

}

}

服务器端：

import java.net.*;

import java.io.*;

public class TestSocketServer {

public static void main(String[] args) {

try {

ServerSocket ss = new ServerSocket(5566);

Socket socket = ss.accept();

DataOutputStream dos = new DataOutputStream(socket.getOutputStream());

DataInputStream dis = new DataInputStream(socket.getInputStream());

String s = null;

if ((s = dis.readUTF()) != null) {

System.out.println("接收到的算式：" + s);

double result = 0;

String[] sarr1 = s.split("[\\+\\-\\*\\/]");

double a = Double.parseDouble(sarr1[0].trim());

double b = Double.parseDouble(sarr1[1].trim());

String[] sarr2 = s.split("^(-?\\d+)(\\.\\d+)?");

char c = sarr2[1].trim().charAt(0);

switch (c) {

case '+':

result = a + b;

break;

case '-':

result = a - b;

break;

case '*':

result = a * b;

break;

case '/':

result = a / b;

break;

default:

break;

}

dos.writeDouble(result);

dos.flush();

}

dis.close();

dos.close();

socket.close();

} catch (IOException e) {

e.printStackTrace();

System.exit(-1);

}

}

}

用java编写一个能进行简单TCP/IP通信的C/S程序

import java.net.ServerSocket;

import java.net.Socket;

public class TcpServer

{

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

{

// 创建服务器端的socket对象

ServerSocket ss = new ServerSocket(5000);

// 监听连接

Socket socket = ss.accept();

// 直到连接建立好之后代码才会往下执行

System.out.println("Connected Successfully!");

}

}

import java.net.Socket;

public class TcpClient

{

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

{

Socket socket = new Socket("127.0.0.1", 5000);

}

}

JAVA Tcp 通讯代码问题

localhost是指你本机，它可以改成127.0.0.1，如果跟其他机器通讯就改成另一台机器的ip地址。8800是指通讯端口；

你把OS里的O理解为output，IS里的I理解为input。OS是输出端，输出端把数据放到BufferedReader，BufferedReader通过端口传输到IS后，再读取。

求 基于java的Modbus/TCP协议 源代码

public static void TestModbus() throws Exception{

IpParameters params = new IpParameters();

params.setHost("localhost");//地址

params.setPort(502);//端口

ModbusFactory factory = new ModbusFactory();

ModbusMaster master = factory.createTcpMaster(params, true);

// 初始化

try {

master.init();

readHoldingRegistersTest(master,1,0,3);

} catch (ModbusInitException e) {

e.printStackTrace();

} finally {

master.destroy();

}

}

public static void main(String[] args) {

try {

TestModbus();

} catch (Exception e) {

// TODO: handle exception

e.printStackTrace();

}

}

private static void readHoldingRegistersTest(ModbusMaster master,

int slaveId, int start, int len) {

try {

// ReadInputRegistersRequest request = new ReadInputRegistersRequest(

// slaveId, start, len);

// ReadInputRegistersResponse response = (ReadInputRegistersResponse) master

// .send(request);

ReadHoldingRegistersRequest request = new ReadHoldingRegistersRequest(

slaveId, start, len);

ReadHoldingRegistersResponse response = (ReadHoldingRegistersResponse) master

.send(request);

if (response.isException()) {

System.out.println("Exception response: message="

+ response.getExceptionMessage());

} else {

ByteQueue byteQueue= new ByteQueue(12);

response.write(byteQueue);

System.out.println(byteQueue);

System.out.println(Arrays.toString(response.getShortData()));

short[] list = response.getShortData();

for(int i = 0; i list.length; i++){

System.out.print(list[i] + " ");

}

}

} catch (ModbusTransportException e) {

e.printStackTrace();

}

}