spring boot 过滤器 @Autowired 注入空指针问题_onceperrequestfilter 空指针-优快云博客

本文分享了在SpringBoot项目中整合Redis并利用ApplicationContext解决@Autowired注入问题的经验。通过自定义ApplicationContextProvider类，实现了无需@Autowired即可获取Bean的方法，适用于Session过滤器等场景。

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今天找了一大圈解决方案，最后在一个评论区找到了解决方案:

@WebFilter(urlPatterns = {"/*"})
public class AuthSessionFilter extends OncePerRequestFilter {
    
    //不再使用@Autowired注入
    private RedisUtil redisUtil = ApplicationContextProvider.getBean(RedisUtil.class);;

}

package com.aaa.util;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;
import org.springframework.context.ApplicationContext;
import org.springframework.beans.BeansException;

@Component
public class ApplicationContextProvider implements ApplicationContextAware {

    private static ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }

    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    public static Object getBean(String name) {
        return getApplicationContext().getBean(name);
    }

    public static <T> T getBean(Class<T> tClass) {
        return getApplicationContext().getBean(tClass);
    }

}

是的，我是一个后端菜鸡，2333