基于springboot拦截器HandlerInterceptor的注入问题

Z时代
2024-01-10
分类：IT

springboot拦截器HandlerInterceptor的注入

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//www.jb51.net/article/223241.htm

springboot HandlerInterceptor 拦截器匹配规则写错导致拦截器无效

项目中发现拦截器无效，访问接口 /user/xxx/xxx 没有进入到拦截器中


@Configuration
public class WebConfigurer implements WebMvcConfigurer {
    @Autowired
    private UserInterceptor userInterceptor;
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
    }
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(userInterceptor).addPathPatterns("/user/*");
    }
}

原因是拦截器的匹配规则弄错了。我希望 userInterceptor拦截器拦截 /user/下所有路径的接口

正确拦截规则是 /user/**