143-SprinBoot如何使用Servlet？

1、配置Servlet

@WebServlet(urlPatterns = "/user/detail")
public class UserServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.getWriter().write("HelloWorld");
        resp.getWriter().flush();
        resp.getWriter().close();
    }

2、扫描Servlet注解,这个要加载启动类上
　　@ServletComponentScan(basePackages="***")