如何在不使用任何JAX-RS实现(Jersey等)的情况下使用Servlet创建RESTful Web服务?
Basically you absolutely right, you don't need a framework in order to implement REST API.
For instance, you could do basic crud operations in simple servlet class, like this:
@WebServlet(urlPatterns = "/book/*")
public class BookServlet extends HttpServlet {
@Override
public void doGet(HttpServletRequest request, HttpServletResponse response) {
// fetch from db
}
@Override
public void doPost(HttpServletRequest request, HttpServletResponse response) {
//update
}
@Override
public void doDelete(HttpServletRequest request, HttpServletResponse responce) {
//delete
}
}
It's a little bit inconvenient since you need to manually parse url params, do serialization, but under the hood, JAXRS and Spring MVC is just a servlets! So, if you don't want dependencies in your code, I could suggest to just implement some convenient wrappers over servlet api.
Tip: you could parse path params from request like this:
String info = request.getPathInfo();
String[] parts = pathInfo.split("/");
String param1 = pathInfo[0];
So, for instance, if you have request like this: HTTP GET /book/{id} You'll get {id} in param1 which can be later used in database lookup.
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