出现问题的代码:
public class MyInterceptor implements HandlerInterceptor {
@Autowired
ToolsService toolsService;
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
System.out.println(toolsService);
}
}
输出为null,但是该bean已经注入到了Spring容器中。
解决方式:
如上代码不需改变
@Configuration
public class AppConfig implements WebMvcConfigurer {
// 加入如下代码可解决
@Bean
public MyInterceptor myInterceptor() {
return new MyInterceptor();
}
/**
* 注册自定义拦截器
*/
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(myInterceptor()).addPathPatterns("/**");
}
}