What are the arguments passed to the restTemplate in spring boot?

 In Spring Boot, RestTemplate is a central class used for making HTTP requests to RESTful web services. The RestTemplate class provides methods to interact with web services by sending HTTP requests and receiving responses. It’s a versatile tool for performing CRUD operations over HTTP. Here’s a breakdown of how RestTemplate works and what arguments can be passed to its methods:

1. Basic Usage of RestTemplate

The RestTemplate class is used to perform HTTP requests, and its methods generally take the following arguments:

• URL: The URL of the REST service you are calling.
• Request Type: The HTTP method to use (e.g., GET, POST, PUT, DELETE).
• Request Body: The body of the request (for POST, PUT, and PATCH methods).
• Response Type: The type of the response you expect to receive.

2. Common Methods and Arguments

Here’s an overview of the common methods provided by RestTemplate and their arguments:

GET Request

·       getForObject(String url, Class<T> responseType, Object... uriVariables)

• url: The URL to send the GET request to.
• responseType: The class type of the response body to be converted into.
• uriVariables: Optional URI variables to be substituted into the URL.

·       getForEntity(String url, Class<T> responseType, Object... uriVariables)

• url: The URL to send the GET request to.
• responseType: The class type of the response body.
• uriVariables: Optional URI variables.

POST Request

·       postForObject(String url, Object request, Class<T> responseType)

• url: The URL to send the POST request to.
• request: The body of the request.
• responseType: The class type of the response body.

·       postForEntity(String url, Object request, Class<T> responseType)

• url: The URL to send the POST request to.
• request: The body of the request.
• responseType: The class type of the response body.

PUT Request

• put(String url, Object request)
• url: The URL to send the PUT request to.
• request: The body of the request.

DELETE Request

• delete(String url, Object... uriVariables)
• url: The URL to send the DELETE request to.
• uriVariables: Optional URI variables.

 3. Example Usage

Here are some practical examples of using RestTemplate:

GET Request Example:

        RestTemplate restTemplate = new RestTemplate();

        String url = "https://api.example.com/resource/{id}";

        Resource resource = restTemplate.getForObject(url, Resource.class, 1);