Shulou(Shulou.com)06/03 Report--

Springboot @WebFilter无法注入其他Bean的示例分析，相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。

示例问题代码：

@WebFilter(filterName = "authorizeFilter", urlPatterns = {"*.htm", "*.html"}, asyncSupported = true)public class AuthorizeFilter implements Filter { @Autowired private OtherBean otherBean; @Override public void init(FilterConfig filterConfig) throws ServletException { } @Override public void destroy() { } @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { // true System.out.println(otherBean == null); }}

现象：

本地运行测试均可通过，上测试环境后运行注入bean为空

现象：使用外置tomcat可触发，本地使用内置tomcat则无此问题

解决代码

@Componentpublic class AuthorizeFilter implements Filter { @Autowired private OtherBean otherBean; @Override public void init(FilterConfig filterConfig) throws ServletException { } @Override public void destroy() { } @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { // false System.out.println(otherBean == null); }}@Configurationpublic class WebFilterConfig implements WebMvcConfigurer { @Autowired private AuthorizeFilter authorizeFilter; @Bean("authorizeFilterBean") public FilterRegistrationBean authorizeFilterBean() { FilterRegistrationBean registration = new FilterRegistrationBean(); registration.setFilter(authorizeFilter); registration.addUrlPatterns(new String[]{"*.htm", "*.html"}); registration.setName("authorizeFilter"); registration.setAsyncSupported(true); return registration; }}

启动类加上：@ServletComponentScan({"com.hybase.site.filter"})

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