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SpringBoot-Web开发之Web原生组件注入

news 2025/10/24 10:15:22

使用Servlet API

Web三大原生组件：Servlet、Filter、Listener
启动类上使用注解@ServletComponentScan(basePackages = "com.my.admin")
- 使用注解的方式注入，需要开启扫描
@WebServlet()
- 执行后会发现直接响应，没有经过Spring的拦截器

//处理/my请求
@WebServlet(urlPatterns = "/my")
public class MyServlet extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {resp.getWriter().write("66666");}
}

@WebFilter

@Slf4j
//拦截所有请求在servlet中是/*，spring中是/**
@WebFilter(urlPatterns={"/css/*","/images/*"}) 
public class MyFilter implements Filter {@Overridepublic void init(FilterConfig filterConfig) throws ServletException {log.info("MyFilter初始化完成");}@Overridepublic void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {log.info("MyFilter工作");chain.doFilter(request,response);}@Overridepublic void destroy() {log.info("MyFilter销毁");}
}

@WebListener

@Slf4j
@WebListener
public class MyServletContextListener implements ServletContextListener {@Overridepublic void contextInitialized(ServletContextEvent sce) {log.info("MySwervletContextListener监听到项目初始化完成");}@Overridepublic void contextDestroyed(ServletContextEvent sce) {log.info("MySwervletContextListener监听到项目销毁");}
}

RegistrationBean

不使用注解注入，使用配置类
ServletRegistrationBean
FilterRegistrationBean
ServletListenerRegistrationBean

@Configuration(proxyBeanMethods = true)
public class MyRegistConfig {@Beanpublic ServletRegistrationBean myServlet(){MyServlet myServlet = new MyServlet();return new ServletRegistrationBean(myServlet,"/my","/my02");}@Beanpublic FilterRegistrationBean myFilter(){MyFilter myFilter = new MyFilter();//myServlet()可以将servlet处理的请求进行过滤//return new FilterRegistrationBean(myFilter,myServlet());FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(myFilter);//自定义过滤的路径filterRegistrationBean.setUrlPatterns(Arrays.asList("/my","/css/*"));return filterRegistrationBean;}@Beanpublic ServletListenerRegistrationBean myListener(){MySwervletContextListener mySwervletContextListener = new MySwervletContextListener();return new ServletListenerRegistrationBean(mySwervletContextListener);}
}