一、Springboot整合Servlet

第一種方案：通過注解掃描完成filter組建的注冊

• 1、編寫自定義filter(FirstFilter)

//urlPattern是一個數組可以添加多個 //@WebFilter(filterName = "FirstFilter",urlPatterns = {"*.do","*.jsp"}) @WebFilter(filterName = "FirstFilter", urlPatterns = {"/first"}) public class FirstFilter implements Filter {@Overridepublic void init(FilterConfig filterConfig) throws ServletException {}@Overridepublic void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {System.out.println("進入filter"); // //放行chain.doFilter(request, response);System.out.println("離開filter");}@Overridepublic void destroy() {} }

• 2、創建servlet(測試用)

@WebServlet(name = "FirstServlet",urlPatterns = "/first") public class FirstServlet extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {System.out.println("FirstServlet啟動........");} }

• 3、編寫一個啟動類,并在啟動類上添加注解

@SpringBootApplication @ServletComponentScan //在springboot啟動時會掃描@Webfilter注解和@webFilter注解，并將該類實例化 public class SpringBootChapter1Application {public static void main(String[] args) {SpringApplication.run(SpringBootChapter1Application.class, args);}}

• 4、啟動項目及瀏覽器驗證：http://localhost:8080/first
• 5、查看控制臺
  

第二種方案：通過方法完成filter組件注冊

• 1、編寫一個自定義的filter

public class SecondFilter implements Filter {@Overridepublic void init(FilterConfig filterConfig) throws ServletException {}@Overridepublic void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {System.out.println("進入SecondFilter");//放行chain.doFilter(request, response);System.out.println("離開SecondFilter");}@Overridepublic void destroy() {} }

• 2、創建一個servlet(測試用)

public class SecondServlet extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {System.out.println("SecondServlet啟動........");} }

• 3、創建一個啟動類

/*** @author gblfy* @ClassNme AppFilter2* @Description springboot整合filter方式2* @Date 2019/2/20 13:45* @version1.0*/ @SpringBootApplication public class SpringbootFilterApplication2 {public static void main(String[] args) {SpringApplication.run(SpringbootFilterApplication2.class, args);}// 注冊servlet@Beanpublic ServletRegistrationBean getServletRegistrationBean() {ServletRegistrationBean bean = new ServletRegistrationBean(new SecondServlet());bean.addUrlMappings("/second");return bean;}// 注冊filter@Beanpublic FilterRegistrationBean getFilterRegistrationBean() {FilterRegistrationBean bean = new FilterRegistrationBean(new SecondFilter()); // bean.addUrlPatterns(new String[]{"*.do","*.jsp"});bean.addUrlPatterns("/second");return bean;} }

• 4、啟動項目及瀏覽器驗證：http://localhost:8080/second

• 5、查看控制臺
  

本文源碼下載：

github地址：
https://github.com/gb-heima/Spring-Boot-Actual-Combat/tree/master/parent/spring-boot-chapter-5

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