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SpringBoot默认以jar包的方式启动内部自定义的Servlet组件，没有web.xml文件，这种情况下我们不禁会考虑，那之前使用SSM框架时的自定义Servlet、过滤器及监听器要如何配置呢？今天就来解答这个问题：

前期准备工作：

创建SpringBoot工程，不懂的可以查阅我之前得文档使用IDEA创建Springboot工程的两种方式，创建CustomerServletConfigurer配置类如下，用于进行配置，名字可以自取

ConfigurationpublicclassCustomerServletConfigurer{}

自定义Servlet配置

创建MyServlet类实现HttpServlet接口，如下

publicclassMyServletextendsHttpServlet{protectedvoiddoGet(HttpServletRequestreq,HttpServletResponseresp)throwsServletException,IOException{System.out.println(MyServlet.doGet);doPost(req,resp);}protectedvoiddoPost(HttpServletRequestreq,HttpServletResponseresp)throwsServletException,IOException{System.out.println(MyServlet.doPost);}}

在CustomerServletConfigurer配置类中配置ServletRegistrationBean的返回类，如下

Bean//配置自定义的ServletpublicServletRegistrationBeanservletRegistrationBean(){ServletRegistrationBeanservletRegistrationBean=newServletRegistrationBean();servletRegistrationBean.setServlet(newMyServlet());servletRegistrationBean.addUrlMappings(/myServlet);returnservletRegistrationBean;}

通过该配置可实现在客户端访问/myServlet相关请求时使用自定义的MyServlet进行处理

自定义Filter配置

创建MyFilter类，实现Filter接口，实现相关方法，如下

publicclassMyFilterimplementsFilter{publicvoidinit(FilterConfigfilterConfig)throwsServletException{System.out.println(MyFilter.init);}publicvoiddoFilter(ServletRequestservletRequest,ServletResponseservletResponse,FilterChainfilterChain)throwsIOException,ServletException{System.out.println(MyFilter.doFilter);}publicvoiddestroy(){System.out.println(MyFilter.destroy);}}

在CustomerServletConfigurer配置类中配置FilterRegistrationBean的返回类，如下

Bean//配置自定义的FilterpublicFilterRegistrationBeanfilterRegistrationBean(){FilterRegistrationBeanfilterRegistrationBean=newFilterRegistrationBean();filterRegistrationBean.setFilter(newMyFilter());filterRegistrationBean.addUrlPatterns(/myFilter);returnfilterRegistrationBean;}

通过该配置可实现在客户端访问/myFilter时先使用过滤器过滤

自定义Listener配置

创建MyListener类，实现ServletContextListener接口，实现相关方法，如下

publicclassMyListenerimplementsServletContextListener{publicvoidcontextInitialized(ServletContextEventsce){System.out.println(MyListener.contextInitialized);}publicvoidcontextDestroyed(ServletContextEventsce){System.out.println(MyListener.contextDestroyed);}}

在CustomerServletConfigurer配置类中配置FilterRegistrationBean的返回类，如下

Bean//配置自定义的ListenerpublicServletListenerRegistrationBeanservletListenerRegistrationBean(){ServletListenerRegistrationBeanservletListenerRegistrationBean=newServletListenerRegistrationBean();servletListenerRegistrationBean.setListener(newMyListener());returnservletListenerRegistrationBean;}

通过该配置可实现Servlet在创建及销毁时执行相应方法

江山父老能容我，不使人间造孽钱，本人小白，如有问题，欢迎指教

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