springboot拦截器HandlerInterceptor的注入问题（转载）
来源：https://blog.csdn.net/baidu_28068985/article/details/106659825
一、问题描述
项目启动后，拦截器下的注入为null，影响拦截器的逻辑操作。如下图：
二、解决策略
原因： 拦截器加载是在springcontext创建之前完成，详情可以看spring的拦截器加载过程及IOC的关系
解决方案一：使用@Bean在拦截器初始化之前让类加载，重点在于@Bean的拦截器处理及getCheckFilter()的引入
具体如下：
// 拦截器处理
public class CheckFilter implements HandlerInterceptor {
@Autowired
private SystemService systemService;
}
// 配置类处理
@Configuration
public class WebMvcConfig extends WebMvcConfigurationSupport {
@Bean
public CheckFilter getCheckFilter(){
return new CheckFilter();
}
@Override
protected void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(getCheckFilter()).addPathPatterns("/**").
excludePathPatterns("/admin/auth/**");
super.addInterceptors(registry);
}
@Override
protected void addResourceHandlers(ResourceHandlerRegistry registry) {
registry.addResourceHandler("/static/**").addResourceLocations("classpath:/static/");
super.addResourceHandlers(registry);
}
@Override
protected void configureViewResolvers(ViewResolverRegistry registry) {
registry.jsp("/WEB-INF/",".jsp");
super.configureViewResolvers(registry);
}
}
解决方案二：给拦截器增加配置注解如：@Configuration 、@Component 。在配置类中注入，具体如下操作：
// 拦截器处理
@Configuration //或者 @Component
public class CheckFilter implements HandlerInterceptor {
@Autowired
private SystemService systemService;
}
// 配置类处理
@Configuration
public class WebMvcConfig extends WebMvcConfigurationSupport {
@Autowired
private CheckFilter checkFilter;
@Override
protected void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(checkFilter).addPathPatterns("/**").
excludePathPatterns("/admin/auth/**");
super.addInterceptors(registry);
}
@Override
protected void addResourceHandlers(ResourceHandlerRegistry registry) {
registry.addResourceHandler("/static/**").addResourceLocations("classpath:/static/");
super.addResourceHandlers(registry);
}
@Override
protected void configureViewResolvers(ViewResolverRegistry registry) {
registry.jsp("/WEB-INF/",".jsp");
super.configureViewResolvers(registry);
}
}
三、知识总结
1、涉及spring的拦截器加载过程及IOC的管理
2、参考资料https://blog.csdn.net/dengdeng333/article/details/87878882
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原文链接：https://blog.csdn.net/baidu_28068985/article/details/106659825
