Question

java如何实现从远程ip和端口接收数，最好能够给出源码，类似于tcp/ip网络调试助手。

我做了一个硬件51单片机和温湿度传感器的东西，利用ESP8266传输数据，利用了TCP/IP的网络调试助手，能够接收到数据，但是由于刚刚学习java sosket并不熟悉相关的知识，看了很多资料，也是不怎么会写，所以请问大神是都能够解决利用java对指定的ip和端口实现接收数据呢？？

Answer 1

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);
}

}
}