Springboot第二篇：整合Servlet、Filter、Listener

springboot整合Servlet、Filter、Listener

有时候需要在Springboot工程里面加入Servlet、Filter、Listener，这个时候需要在启动类加入：
@ServletComponentScan(basePackages = {“com.tan.demo”})
扫描@WebServlet、@WebFilter、@WebListener注解，把Servlet、filter、listener加入到spring容器中。

1、整合Servlet

@WebServlet(urlPatterns = "/tan/ServletTest")
public class TanServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println("-----------------doGet-----------------------");
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println("------------------doPost----------------------");
    }
}

效果如下：

2、整合Filter

@WebFilter(urlPatterns = "/*")
public class TanFilter implements Filter {
    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        System.out.println("--------MyFilter----------");
        chain.doFilter(request,response);
    }
}

效果如下：

3、整合Listener

@Override
public void contextDestroyed(ServletContextEvent contextEvent) {
    System.out.println("contextDestroyed"); }
@Override
public void contextInitialized(ServletContextEvent contextEvent) {
    System.out.println("contextInitialized"); }

效果如下：