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
@Component 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 { // false System.out.println(otherBean == null); } }
@Configuration public 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”})