In short how to do an apex callout from Class..
Apex class:
global class with sharing ApexCallout{
public void callout()
//Construct a HTTP Request
HttpRequest req = new HttpRequest() ;
string strUrl=’**********Place your Remote Site Address here**********”;
//Before making this callout, you need to add Remote site address in the Remote Site Settings of your Organization..
//Setting Endpoint URL to HTTP request
//Set the request type
//HTTP object creation
Http http = new Http();
//Sending the Req throgh HTTPResponse object.
HTTPResponse res = http.send(req);
If you need to pass some parameters in the method, you can do it..
by changing the method to method with arguments.
You can call this method from trigger also..

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I am Sakthivel Madesh, a certified Salesforce Advanced Developer & Administrator working on Salesforce Technology since 2011. I am currently working in Techforce Services as Sr. Salesforce Developer. I have worked on multiple technologies Like PHP, Java, Salesforce, I am very passionate about Salesforce and to earn 15x Salesforce Certification. I love Trailhead for learning Salesforce Skill and Become a Trailhead 5x Ranger too. I Love to Learn & Share my Salesforce knowledge to Salesforce Learners/Beginner using My Blog and Salesforce Community.

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