SpringBoot—整合web基础组件(HttpServlet，ServletRequestListener，Filter)

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：