Java 我想将POST请求从arduino发送到mysql工作台并保存该值

我已经在spring boot应用程序中创建了api。我的arduino代码在arduino日志中返回-1 httpcode。所以我发布数据的api是{value} 下面是我的arduino代码

阿杜伊诺代码

#include <ESP8266HTTPClient.h>
#include <ESP8266WiFi.h> 

// defines pins numbers
const int trigPin = 2;  //D4
const int echoPin = 0;  //D3

// defines variables
long duration;
int distance;

void setup() {
pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
pinMode(echoPin, INPUT); // Sets the echoPin as an Input
Serial.begin(9600); // Starts the serial communication
}

void loop() {
// Clears the trigPin
digitalWrite(trigPin, LOW);
delayMicroseconds(2);

// Sets the trigPin on HIGH state for 10 micro seconds
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);

// Reads the echoPin, returns the sound wave travel time in microseconds
duration = pulseIn(echoPin, HIGH);

// Calculating the distance
distance= duration*0.034/2;
// Prints the distance on the Serial Monitor
Serial.print("Distance: ");
Serial.println(distance);
   HTTPClient http;
    http.begin("http://localhost:8080/ApparelProject/device/saveDistance");
    http.addHeader("Content-Type", "text/plain;charset=UTF-8");
  int httpCode = http.POST("125");

    Serial.println(httpCode);
       http.end();

   /* HTTPClient http;
       String url = "localhost:8080/ApparelProject/device/saveDistance/"+String(distance);
       Serial.println(url);
       //localhost:8080/ApparelProject/device/saveDistance/20000    
        http.begin(url);

        //POST method
       int httpCode = http.GET();
       Serial.println(httpCode);
       http.end();*/
delay(2000);
}

---

试试这样的

HTTPClient http;
http.begin("http://localhost:8080/ApparelProject/device/saveDistance/125");
http.addHeader("Content-Type", "text/plain;charset=UTF-8");
int httpCode = http.POST();

Serial.println(httpCode);
http.end();

尝试类似的操作以确保连接正常工作

    void setup() {

  Serial.begin(115200);
  delay(4000);   //Delay needed before calling the WiFi.begin

  WiFi.begin(ssid, password); 

  while (WiFi.status() != WL_CONNECTED) { //Check for the connection
    delay(1000);
    Serial.println("Connecting to WiFi..");
  }

  Serial.println("Connected to the WiFi network");

}

试试这个。。。 为此，您将需要一个JSON库

StaticJsonBuffer<300> JSONbuffer;   //Declaring static JSON buffer
  JsonObject& JSONencoder = JSONbuffer.createObject();

  JSONencoder["value"] = "125"; //or some variable
  char JSONmessageBuffer[300];
  JSONencoder.prettyPrintTo(JSONmessageBuffer, sizeof(JSONmessageBuffer));

  HTTPClient http;    //Declare object of class HTTPClient

  http.begin("http://Your_PC_IP_Address:8080/ApparelProject/device/saveDistance");      //Specify request destination
  http.addHeader("Content-Type", "application/json");  //Specify content-type header

  int httpCode = http.POST(JSONmessageBuffer);   //Send the request
  String payload = http.getString();                  //Get the response payload

---

根据您的后端API更改，对不起，我对Spring Endpoint没有太多了解。

您也可以共享API代码吗？@supundharmarathne您单独测试过Endpoint吗？是的，是的，arduino代码有错误吗？请看下面我修改过的答案。我尝试一下，它不起作用。是否有其他方法发送post请求？是的http我已经包括了我的arduino代码和我的控制器代码

StaticJsonBuffer<300> JSONbuffer;   //Declaring static JSON buffer
  JsonObject& JSONencoder = JSONbuffer.createObject();

  JSONencoder["value"] = "125"; //or some variable
  char JSONmessageBuffer[300];
  JSONencoder.prettyPrintTo(JSONmessageBuffer, sizeof(JSONmessageBuffer));

  HTTPClient http;    //Declare object of class HTTPClient

  http.begin("http://Your_PC_IP_Address:8080/ApparelProject/device/saveDistance");      //Specify request destination
  http.addHeader("Content-Type", "application/json");  //Specify content-type header

  int httpCode = http.POST(JSONmessageBuffer);   //Send the request
  String payload = http.getString();                  //Get the response payload

{
   value:"125"
}