转载

玩转 SpringBoot 2 快速整合 Filter

概述

SpringBoot 中没有 web.xml，我们无法按照原来的方式在 web.xml 中配置 Filter 。但是我们可以通过 JavaConfig（@Configuration +@Bean）方式进行配置。通过FilterRegistrationBean 将自定义 Filter 添加到 SpringBoot 的过滤链中。

实战操作

实战操作通过定义一个拦截所有访问项目的URL的 Filter来进行演示的。

首先定义一个统一访问 URL 拦截的 Filter。代码如下：

public class UrlFilter implements Filter {
    private Logger log =  LoggerFactory.getLogger(UrlFilter.class);
 
    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
    HttpServletRequest httpServletRequest = (HttpServletRequest) request;
        String requestURI = httpServletRequest.getRequestURI();
        StringBuffer requestURL = httpServletRequest.getRequestURL();
        log.info("requestURI:" +requestURI+" "+"requestURL:"+requestURL);
        chain.doFilter(httpServletRequest, response);
    }
 
}

通过 javaConfig方式配置 SpringBoot 过滤链类 FilterRegistrationBean，具体代码如下：

@Configuration
public class FilterConfig {
    @Bean
    public FilterRegistrationBean filterRegistration() {
        FilterRegistrationBean registration = new FilterRegistrationBean();
        registration.setFilter(new UrlFilter());
        List<String> urlList = new ArrayList<String>();
        urlList.add("/*");
        registration.setUrlPatterns(urlList);
        registration.setName("UrlFilter");
        registration.setOrder(1);
        return registration;
    }
}