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