2. 整合 Filter

1. 通过注解扫描完成 Filter 组件的注册
   • 在 servlet3.0 之后，我们可以使用注解 @WebFilter 的方式进行配置过滤器，该方式过滤不用去 xml 文件中配置就可以使用，但是默认过滤器顺序是按照类名来控制，如果对过滤器顺序有严格的要求，则需要在 web.xml 中定义（按先后顺序）。
   • 1.1 编写 Filter /***SpringBoot 整合 Filter 方式一

<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("进入 Filter"); 
        arg2.doFilter(arg0, arg1); 
        System.out.println("离开 Filter"); 
    }
    @Override 
    public void init(FilterConfig arg0) throws ServletException { 
        // TODO Auto-generated method stub 
    } 
}

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/***SpringBoot 整合 Filter 方式一 **/ 
@SpringBootApplication @ServletComponentScan 
public class App { 
    public static void main(String[] args) { 
        SpringApplication.run(App.class, args); 
    } 
}

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1. 通过方法完成 Filter 组件的注册
   • 2.1 编写 Filter

/***SpringBoot 整合 Filter 方式二 **/ 
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("进入 SecondFilter"); 
        arg2.doFilter(arg0, arg1); 
        System.out.println("离开 SecondFilter"); 
    }   
    @Override 
    public void init(FilterConfig arg0) throws ServletException { 
        // TODO Auto-generated method stub 
    } 
}

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 /*** SpringBoot 整合 Filter 方式二 ***/ 
@SpringBootApplication 
public class App2 { 
    public static void main(String[] args) { 
        SpringApplication.run(App2.class, args); 
    }
    /*** 注册 Servlet * @return */ 
    @Bean 
    public ServletRegistrationBean getServletRegistrationBean(){ 
        ServletRegistrationBean bean = new ServletRegistrationBean(new SecondServlet()); 
        bean.addUrlMappings("/second"); 
        return bean; 
    }
    /*** 注册 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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