第五篇：Spring Boot整合filter

一、Springboot整合Servlet

第一种方案：通过注解扫描完成filter组建的注册

1、编写自定义filter(FirstFilter)

//urlPattern是一个数组可以添加多个
//@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("进入filter");
//        //放行chain.doFilter(request, response);System.out.println("离开filter");}@Overridepublic void destroy() {}
}

2、创建servlet(测试用)

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

3、编写一个启动类,并在启动类上添加注解

@SpringBootApplication
@ServletComponentScan
//在springboot启动时会扫描@Webfilter注解和@webFilter注解，并将该类实例化
public class SpringBootChapter1Application {public static void main(String[] args) {SpringApplication.run(SpringBootChapter1Application.class, args);}}

4、启动项目及浏览器验证：http://localhost:8080/first
5、查看控制台

第二种方案：通过方法完成filter组件注册

1、编写一个自定义的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("进入SecondFilter");//放行chain.doFilter(request, response);System.out.println("离开SecondFilter");}@Overridepublic void destroy() {}
}

2、创建一个servlet(测试用)

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

3、创建一个启动类

/*** @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);}//    注册servlet@Beanpublic ServletRegistrationBean getServletRegistrationBean() {ServletRegistrationBean bean = new ServletRegistrationBean(new SecondServlet());bean.addUrlMappings("/second");return bean;}//    注册filter@Beanpublic FilterRegistrationBean getFilterRegistrationBean() {FilterRegistrationBean bean = new FilterRegistrationBean(new SecondFilter());
//        bean.addUrlPatterns(new String[]{"*.do","*.jsp"});bean.addUrlPatterns("/second");return bean;}
}