【Springboot | 过滤器】配置类和注解两种方式_springboot过滤器读方法的注解-优快云博客

本文链接：https://blog.youkuaiyun.com/pingyufeng/article/details/127550532

本文介绍Spring Boot中拦截器与过滤器的配置方法。一是通过FilterRegistrationBean配置，该类需继承Filter类，在Spring boot中用FilterRegistrationBean完成配置；二是注解配置，用@WebFilter配置，设置url匹配模式等，还需在配置类加@ServletComponetScan指定扫描包。

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Spring Boot实战：拦截器与过滤器

方式一：FilterRegistrationBean配置

这个类必须继承Filter类，这个是Servlet的规范
Spring boot中，我们需要FilterRegistrationBean来完成配置。

public class LogCostFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
 
    }
 
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        long start = System.currentTimeMillis();
        filterChain.doFilter(servletRequest,servletResponse);
        System.out.println("Execute cost="+(System.currentTimeMillis()-start));
    }
 
    @Override
    public void destroy() {
 
    }
}

@Configuration
public class FilterConfig {
 
    @Bean
    public FilterRegistrationBean registFilter() {
        FilterRegistrationBean registration = new FilterRegistrationBean();
        registration.setFilter(new LogCostFilter());
        registration.addUrlPatterns("/*");
        registration.setName("LogCostFilter");
        registration.setOrder(1);
        return registration;
    }
 
}

方式二：注解配置

用@WebFilter就可以进行配置，同样，可以设置url匹配模式，过滤器名称等。这里需要注意一点的是@WebFilter这个注解是Servlet3.0的规范，并不是Spring boot提供的。除了这个注解以外，我们还需在配置类中加另外一个注解：@ServletComponetScan，指定扫描的包。

@WebFilter(urlPatterns = "/*", filterName = "logFilter2")
public class LogCostFilter2 implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
 
    }
 
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        long start = System.currentTimeMillis();
        filterChain.doFilter(servletRequest, servletResponse);
        System.out.println("LogFilter2 Execute cost=" + (System.currentTimeMillis() - start));
    }
 
    @Override
    public void destroy() {
 
    }
}

@SpringBootApplication
@MapperScan("com.pandy.blog.dao")
@ServletComponentScan("com.pandy.blog.filters")
public class Application {
    public static void main(String[] args) throws Exception {
        SpringApplication.run(Application.class, args);
    }
}