WebServlet 默认“/” 访问问题

Question

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet(urlPatterns  = "/")
public class MyServlet extends HttpServlet {

  @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.getWriter().append("get req");
    }

  @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.getWriter().append("post req");
    }

}

springboot框架建了个1个Servlet ， 匹配路径"/", 用 http://127.0.0.1:8080/abc , 访问报错404; 改为 "/*" 可以，
请问为何用默认路径"/",无法访问？

Answer 1

默认路径是/不是/abc
@WebServlet(urlPatterns = "/abc")
才能匹配上/abc路径。