#include <ESP8266WiFi.h>
/*** 該工程可以在2.4.0版本esp8266庫中運行，沒在更高版本庫中進行測試 ***/
const char *ssid = "WIFI名稱";
const char *password = "WIFI密碼";
WiFiServer server(80);
String readString = ""; //建立一個字符串對象用來接收存放來自客戶的數據
//響應頭
String responseHeaders =
String("") +
"HTTP/1.1 200 OK\r\n" +
"Content-Type: text/html\r\n" +
"Connection: close\r\n" +
"\r\n";
//網頁
String myhtmlPage =
String("") +
"<html>" +
"<head>" +
" <title>ESP8266 Web Server Test</title>" +
" <script defer=\"defer\">" +
" function ledSwitch() {" +
" var xmlhttp;" +
" if (window.XMLHttpRequest) {" +
" xmlhttp = new XMLHttpRequest();" +
" } else {" +
" xmlhttp = new ActiveXObject(\"Microsoft.XMLHTTP\");" +
" }" +
" xmlhttp.onreadystatechange = function () {" +
" if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {" +
" document.getElementById(\"txtState\").innerHTML = xmlhttp.responseText;" +
" }" +
" }," +
" xmlhttp.open(\"GET\", \"Switch\", true);" +
" xmlhttp.send(); " +
" }" +
" </script>" +
"</head>" +
"<body><center>" +
" <div id=\"txtState\">Unkwon</div>" +
" <input type=\"button\" value=\"Switch\" onclick=\"ledSwitch()\"></center>" +
"</body>" +
"</html>";
bool isLedTurnOpen = false; // 記錄LED狀態
void setup()
{
pinMode(LED_BUILTIN, OUTPUT);
digitalWrite(LED_BUILTIN, HIGH); // 熄滅LED
Serial.begin(115200);
Serial.println();
Serial.printf("Connecting to %s ", ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED)
{
delay(500);
Serial.print(".");
}
Serial.println(" connected");
server.begin();
Serial.printf("Web server started, open %s in a web browser\n", WiFi.localIP().toString().c_str());
}
void loop()
{
WiFiClient client = server.available(); //嘗試建立客戶對象
if (client) //如果當前有客戶可用
{
boolean currentLineIsBlank = true;
Serial.println("[Client connected]");
while (client.connected()) //如果客戶端建立連接
{
if (client.available()) //等待有可讀數據
{
char c = client.read(); //讀取一字節數據
readString += c; //拼接數據
/************************************************/
if (c == '\n' && currentLineIsBlank) //等待請求頭接收完成(接收到空行)
{
//比較接收到的請求數據
if (readString.startsWith("GET / HTTP/1.1")) //如果是網頁請求
{
client.print(responseHeaders); //向客戶端輸出網頁響應
client.print(myhtmlPage); //向客戶端輸出網頁內容
client.print("\r\n");
}
else if (readString.startsWith("GET /Switch")) //如果是改變LED狀態請求
{
if (isLedTurnOpen == false)
{
digitalWrite(LED_BUILTIN, LOW); // 點亮LED
client.print("LED has been turn on");
isLedTurnOpen = true;
}
else
{
digitalWrite(LED_BUILTIN, HIGH); // 熄滅LED
client.print("LED has been turn off");
isLedTurnOpen = false;
}
}
else
{
client.print("\r\n");
}
break;
}
if (c == '\n')
{
currentLineIsBlank = true; //開始新行
}
else if (c != '\r')
{
currentLineIsBlank = false; //正在接收某行中
}
/************************************************/
}
}
delay(1); //等待客戶完成接收
client.stop(); //結束當前連接:
Serial.println("[Client disconnected]");
Serial.println(readString); //打印輸出來自客戶的數據
readString = "";
}
}
