SpringBoot中拦截器中使用@Value无效和无法注入类的问题-创新互联

在使用Spring Boot框架时，很经常会使用到拦截器。可是，有时候我们会遇到在拦截器使用@Value注解来获取配置文件中的配置参数获取失败，一直都是为null的情况

解决办法

@value：定义一个静态类型，然后定义一个方法在方法上使用@value注解取值并赋值

无法注入类：使用ApplicationContext注入即可

@Component
public class BaseInterceptor implements HandlerInterceptor {

    @Autowired
    private RedisUtils redisUtils = MyApplicationContext.getBean(RedisUtils.class);


    public static String active;


    @Value("${spring.profiles.active}")
    public void setActive(String active){
        BaseInterceptor.active = active;
    }

    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
        System.out.println("active = " + active);
    }


    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse response, Object o, ModelAndView modelAndView) throws Exception {
        response.setHeader("Access-Control-Allow-Origin", "*");
        response.setHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS");
        response.setHeader("Access-Control-Max-Age", "3600");
        response.setHeader("Access-Control-Allow-Headers", "*");
        response.setHeader("Access-Control-Allow-Credentials", "true");
    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
    }

}

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