springboot拦截器无法注入redisTemplate的解决方法

2024-04-02 19:04:59 327人浏览薄情痞子

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摘要

在工作中我们经常需要做登录拦截验证或者其他拦截认证功能，基于SpringBoot项目下我们很容易想到结合Redis做的分布式拦截，把用户登录或者需要验证的信息放到redis里面。但是

在工作中我们经常需要做登录拦截验证或者其他拦截认证功能，基于SpringBoot项目下我们很容易想到结合Redis做的分布式拦截，把用户登录或者需要验证的信息放到redis里面。但是在写拦截器的时候发现redisTemplate一直无法注入进来，最后查资料才发现springboot拦截器是在Bean实例化之前执行的，所以Bean实例无法注入。

先看下问题，新建一个拦截器，然后注入redisTemplate



@Component
public class AccessLimitIntercept implements HandlerInterceptor {
    private static final Logger logger = LoggerFactory.getLogger(AccessLimitIntercept.class);
 
    @Autowired
    private StringRedisTemplate redisTemplate;
 
    
    @Override
    public boolean preHandle(httpservletRequest request, HttpServletResponse response, Object handler) throws Exception {
        try {
 
            String test = redisTemplate.opsForValue().get("test");
            logger.info(test);
        } catch (Exception e) {
            logger.error("api请求限流拦截异常，异常原因：", e);
            throw new ParameterException(e);
        }
        return true;
    }
 
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
 
    }
 
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
 
    }
 
    private boolean setResponse(Results results, HttpServletResponse response) throws IOException {
        ServletOutputStream outputStream = null;
        try {
            response.setHeader("Content-type", "application/JSON; charset=utf-8");
            outputStream = response.getOutputStream();
            outputStream.write(jsonUtil.toJson(results).getBytes("UTF-8"));
        } catch (Exception e) {
            logger.error("setResponse方法报错", e);
            return false;
        } finally {
            if (outputStream != null) {
                outputStream.flush();
                outputStream.close();
            }
        }
        return true;
    }
}

然后配置拦截器，新建一个拦截器config类，我们这里让所有的url都拦截


@Configuration
public class WEBFilterConfig implements WebmvcConfigurer {
 
	
	@Override
	public void addInterceptors(InterceptorReGIStry registry) {
		registry.addInterceptor(new AccessLimitIntercept()).addPathPatterns("
	@Bean
	public AccessLimitIntercept getAccessLimitIntercept() {
		return new AccessLimitIntercept();
	}
 
	
	@Override
	public void addInterceptors(InterceptorRegistry registry) {
		registry.addInterceptor(getAccessLimitIntercept()).addPathPatterns("/**");
	}
 
 
}

使用postman再次请求就可以访问到