Springboot @WebFilter无法注入其他Bean

拼搏现实的明天。 2022-09-11 01:16 220阅读 0赞

**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”\})

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