SpringBoot 2 快速整合 Filter过程解析

2019-11-26 08:37:53

字体：大中小

来源：转载

供稿：网友

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：

@Configurationpublic 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;  }}

FilterRegistrationBean 中方法介绍：