@HttpPost web service in Salesforce

Here's Apex code for an @HttpPost web service in Salesforce. This code defines a simple web service that accepts JSON data through an HTTP POST request and returns a response.

@RestResource(urlMapping='/myservice')

global with sharing class MyRestService {

    @HttpPost

    global static String doPost(String requestBody) {

        try {

            // Parse the incoming JSON request body

            Map<String, Object> requestMap = (Map<String, Object>) JSON.deserializeUntyped(requestBody);

            

            // Process the data as needed

            String firstName = (String) requestMap.get('firstName');

            String lastName = (String) requestMap.get('lastName');

            Integer age = (Integer) requestMap.get('age');

            

            // Create a response JSON

            Map<String, Object> responseMap = new Map<String, Object>();

            responseMap.put('message', 'Data received successfully');

            responseMap.put('firstName', firstName);

            responseMap.put('lastName', lastName);

            responseMap.put('age', age);

            

            // Serialize the response to JSON

            String responseJson = JSON.serialize(responseMap);

            

            return responseJson;

        } catch (Exception e) {

            // Handle any errors

            Map<String, Object> errorResponse = new Map<String, Object>();

            errorResponse.put('error', 'An error occurred: ' + e.getMessage());

            

            return JSON.serialize(errorResponse);

        }

    }

}

In this example:

1. The @RestResource annotation defines the URL mapping for the web service.
2. The @HttpPost annotation specifies that this method should be invoked for HTTP POST requests.
3. The doPost method takes the JSON request body as a string parameter and processes it.
4. The request body is deserialized into a map for processing.
5. The processed data is used to create a response map.
6. The response map is serialized back into JSON, which is returned as the HTTP response.