阅读完需:约 1 分钟
原本在springboot是不需要这些东西的,因为我们有拦截器,有@Controller,@Service等等但是有些第三方的插件需要这些东西,所以还是先记录一下:

Filter
@WebFilter
public class MyFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
System.out.println("MyFilter");
filterChain.doFilter(servletRequest,servletResponse);
}
@Override
public void destroy() {
}
}
ServletRequestListener
@WebListener
public class MyRequestListener implements ServletRequestListener {
@Override
public void requestDestroyed(ServletRequestEvent sre) {
System.out.println("requestDestroyed1");
}
@Override
public void requestInitialized(ServletRequestEvent sre) {
System.out.println("requestInitialized2");
}
}
HttpServlet
@WebServlet(urlPatterns = "/myServlet")
public class MyServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println("Myservlet");
}
}
测试:
在网页上输入:localhost:8080/myServlet
就有结果了:
