Salesforce: APEX HTTP callout example, POST and GET
Steps to implement apex HTTP callout:
How to integrate SFDC with external webservice?
Using this you can integrate your SFDC instance with external systems, that can be your SAP, Oracle Apps or any other in-house application which need your sfdc data more or less immediately to process request.
This callout is for Rest webservice:
1) External system enabled with REST webservice with JSON/XML response ( we are using Json in this example)
2) Register, our external endpoint URL with SFDC "Remote sites". ( endpoint URL, is the external system URL which will serving your request)
3) Invoking HTTP Callouts using following code:
Following is the sample/example apex class which is making callouts to external system rest webservice. This example also shows you , how Serializeand deSerialize Json. (Object to Json String and vise-verse).
public with sharing class TestHttpCallOut {
String endPoint = 'http://***yousite_app***.com/sfdc';
public void postDataToRemote(String name,String email,Integer age){
performAction('POST',name,email,age);
}
public void fetchDataFromRemote(){
performAction('GET');
}
public void performAction(String method,String name,String email,Integer age){
//Prepare http req
HttpRequest req = new HttpRequest();
req.setEndpoint(endPoint);
req.setMethod(method);
Map<String,object> mapEmp = new Map<String,object>();
mapEmp.put('name',name);
mapEmp.put('email',email);
mapEmp.put('age',age);
String JSONString = JSON.serialize(mapEmp);
req.setBody(JSONString);
Http http = new Http();
HTTPResponse res = http.send(req);
System.debug(res.getBody());
}
public void performAction(String method){
HttpRequest req = new HttpRequest();
req.setEndpoint(endPoint);
req.setMethod(method);
Http http = new Http();
HTTPResponse res = http.send(req);
Map<String,String> responseMap = (Map<String,String>)JSON.deSerialize(res.getBody(),Map<String,String>.class);
System.debug(responseMap);
}
}
Use folloiwng commented code to execute this example,
/*
//TestHttpCallOut a = new TestHttpCallOut ();
//a.fetchDataFromRemote();
//a.postDataToRemote('BOB','abc@xyz.com',101);
*/
