spring boot 拦截器的实现以及遇到的问题的解决方案

矫情吗；* 2022-07-12 13:29 154阅读 0赞

# spring boot拦截器的实现 #

## 1、创建拦截器 ##

创建拦截器，实现HandlerInterceptor接口即可

import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    import org.springframework.web.servlet.HandlerInterceptor;
    import org.springframework.web.servlet.ModelAndView;
    
    public class MyInterceptor implements HandlerInterceptor{ 
    
        @Autowired
        private BeanService service ;
        @Override
        public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
                throws Exception {
            // TODO Auto-generated method stub
            return false;
        }
    
        @Override
        public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
                               ModelAndView modelAndView)
                throws Exception {
            // TODO Auto-generated method stub
    
        }
    
        @Override
        public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
                throws Exception {
            // TODO Auto-generated method stub
    
        }
    
    }

## 2、注册拦截器 ##

注册拦截器的实现

import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.web.servlet.config.annotation.EnableWebMvc;
    import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
    import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
    
    
    
    @Configuration
    @EnableWebMvc
    public class MyWebMvcConfigurerAdapter extends WebMvcConfigurerAdapter { 
    
        @Bean
        MyInterceptor  myInterceptor(){
            return new MyInterceptor();
        }
        @Override
        public void addInterceptors(InterceptorRegistry registry) {
            registry.addInterceptor(myInterceptor()).addPathPatterns("/*");
            super.addInterceptors(registry);
            super.addInterceptors(registry);
        }
    }

# 问题解析 #

1、bean加载的问题  
　　在拦截器中注入bean。然后在注册拦截器的时候直接new或者是注入数据的时候会出现拦截器中的bean注册失败的问题，解决方案如MyWebMvcConfigurerAdapter代码片。添加一个方法去做拦截器加载，在方法上使用@bean去进行bean的加载管理即可