Mapping of HTTP Methods to RESTful Web Services Function in Java?

In a RESTful web service implemented in Java, the mapping of HTTP methods to the corresponding functions (methods) can be achieved using annotations provided by the Java Servlet API and JAX-RS (Java API for RESTful Web Services).

Here's a mapping of commonly used HTTP methods to their corresponding annotations and functions in Java: GET: 

The GET method is used to retrieve data from the server. Using JAX-RS: Annotate the method with @GET.

@GET
public Response getData() {
    // Retrieve and return data
}

Using Servlet: Override the doGet() method.

protected void doGet(HttpServletRequest request, HttpServletResponse response) {
    // Retrieve and return data
}

POST: The POST method is used to submit data to the server. Using JAX-RS: Annotate the method with @POST.

@POST
public Response postData(DataObject data) {
    // Process and store the data
}

Using Servlet: Override the doPost() method.

protected void doPost(HttpServletRequest request, HttpServletResponse response) {
    // Process and store the data
}

PUT: The PUT method is used to update an existing resource on the server. Using JAX-RS: Annotate the method with @PUT.

@PUT
public Response updateData(DataObject data) {
    // Update the resource with the provided data
}

Using Servlet: Override the doPut() method.

protected void doPut(HttpServletRequest request, HttpServletResponse response) {
    // Update the resource with the provided data
}

DELETE: The DELETE method is used to remove a resource from the server. Using JAX-RS: Annotate the method with @DELETE.

@DELETE
public Response deleteData(@PathParam("id") int id) {
    // Delete the resource with the specified ID
}

Using Servlet: Override the doDelete() method.

protected void doDelete(HttpServletRequest request, HttpServletResponse response) {
    // Delete the resource with the specified ID
}

These are just a few examples of how HTTP methods can be mapped to functions in a RESTful web service implemented in Java. The actual implementation may vary depending on the chosen framework or library, such as JAX-RS (e.g., Jersey, RESTEasy) or Spring MVC. The annotations and method names can be customized based on your specific requirements and the chosen framework's conventions.