拦截器中无法注入service

分手后的思念是犯贱 2024-02-18 17:01 53阅读 0赞

在拦截器中注入service时,报空指针.发现拦截器的加载时间在Spring上下文之前加载,,所以需要提前将拦截器注册到Spring上下文中

失败案例:

package com.example.interceptor;
    
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.web.servlet.HandlerInterceptor;
    import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
    import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
    
    /**
     * @Author: sun
     * @Email: szw3366@126.com
     * @Date: 2017/12/4
     * @Time: 10:41
     * @Description: 此乃拦截器之注册
     */
    @Configuration
    public class UserInterceptorRegister extends WebMvcConfigurerAdapter {
       
        /**
         * 注册拦截器
         *
         * @param registry
         */
        @Override
        public void addInterceptors(InterceptorRegistry registry) {
            /**
             * 多个拦截器组成一个拦截器链
             * addPathPatterns 用于添加拦截规则
             * excludePathPatterns 用户排除拦截
             * 拦截路径配置:例:拦截所有:"/**"
             */
           registry.addInterceptor(new UserInterceptor()).addPathPatterns("/userinfo/**");
            //registry.addInterceptor(new InterceptorName2()).addPathPatterns("/**");
            //registry.addInterceptor(new InterceptorName3()).addPathPatterns("/**");以此类推
            super.addInterceptors(registry);
        }
    }

成功案例:

package com.example.interceptor;
    
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.web.servlet.HandlerInterceptor;
    import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
    import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
    
    /**
     * @Author: sun
     * @Email: szw3366@126.com
     * @Date: 2017/12/4
     * @Time: 10:41
     * @Description: 此乃拦截器之注册
     */
    @Configuration
    public class UserInterceptorRegister extends WebMvcConfigurerAdapter {
        /**
         *
         * @return
         */
        @Bean
        public HandlerInterceptor getUserInterceptor(){
            return new UserInterceptor();
        }
        /**
         * 注册拦截器
         *
         * @param registry
         */
        @Override
        public void addInterceptors(InterceptorRegistry registry) {
            /**
             * 多个拦截器组成一个拦截器链
             * addPathPatterns 用于添加拦截规则
             * excludePathPatterns 用户排除拦截
             * 拦截路径配置:例:拦截所有:"/**"
             */
           registry.addInterceptor(getUserInterceptor()).addPathPatterns("/userinfo/**");
            //registry.addInterceptor(new InterceptorName2()).addPathPatterns("/**");
            //registry.addInterceptor(new InterceptorName3()).addPathPatterns("/**");以此类推
            super.addInterceptors(registry);
        }
    }