2. integrate filter

1. Complete with annotation scan Filter Registration of components
   • stay servlet3.0 after , We can use annotations @WebFilter To configure the filter , No need to filter in this way xml The configuration in the file can be used , But the default filter order is controlled by class name , If there are strict requirements for filter sequence , You need to in web.xml In the definition of （ In order of precedence ）.
   • 1.1 To write Filter /***SpringBoot Integrate Filter Mode one

<filter>
    <filter-name>FirstFilter</filter-name> 
    <filter-class>com.bjsxt.filter.FirstFilter</filter-class> 
</filter> 
<filter-mapping> 
    <filter-name>FirstFilter</filter-name> 
    <url-pattern>/first</url-pattern> 
</filter-mapping>

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//@WebFilter(filterName="FirstFilter",urlPatterns={"*.do","*.jsp"}) 
@WebFilter(filterName="FirstFilter",urlPatterns="/first") 
public class FirstFilter implements Filter { 
    @Override 
    public void destroy() { 
        // TODO Auto-generated method stub 
    }
    @Override 
    public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2) throws IOException, ServletException { 
        System.out.println(" Get into  Filter"); 
        arg2.doFilter(arg0, arg1); 
        System.out.println(" Leave  Filter"); 
    }
    @Override 
    public void init(FilterConfig arg0) throws ServletException { 
        // TODO Auto-generated method stub 
    } 
}

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/***SpringBoot  Integrate  Filter  Mode one  **/ 
@SpringBootApplication @ServletComponentScan 
public class App { 
    public static void main(String[] args) { 
        SpringApplication.run(App.class, args); 
    } 
}

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1. To complete by means of Filter Registration of components
   • 2.1 To write Filter

/***SpringBoot  Integrate  Filter  Mode two  **/ 
public class SecondFilter implements Filter { 
    @Override 
    public void destroy() { 
        // TODO Auto-generated method stub 
    }
    @Override 
    public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2) throws IOException, ServletException { 
        System.out.println(" Get into  SecondFilter"); 
        arg2.doFilter(arg0, arg1); 
        System.out.println(" Leave  SecondFilter"); 
    }   
    @Override 
    public void init(FilterConfig arg0) throws ServletException { 
        // TODO Auto-generated method stub 
    } 
}

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 /*** SpringBoot  Integrate  Filter  Mode two  ***/ 
@SpringBootApplication 
public class App2 { 
    public static void main(String[] args) { 
        SpringApplication.run(App2.class, args); 
    }
    /***  register  Servlet * @return */ 
    @Bean 
    public ServletRegistrationBean getServletRegistrationBean(){ 
        ServletRegistrationBean bean = new ServletRegistrationBean(new SecondServlet()); 
        bean.addUrlMappings("/second"); 
        return bean; 
    }
    /***  register  Filter */ 
    @Bean 
    public FilterRegistrationBean getFilterRegistrationBean(){ 
        FilterRegistrationBean bean = new FilterRegistrationBean(new SecondFilter()); 
        //bean.addUrlPatterns(new String[]{"*.do","*.jsp"}); 
        bean.addUrlPatterns("/second"); 
        return bean;
    }
}

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