Interceptor

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역할

• Spring이 제공하는 기술
• DispatcherServlet이 컨트롤러를 호출하기 전과 후에 요청과 응답을 참조하거나 가공

사용방법

Interceptor 정의

public class DataSourceInterceptor implements HandlerInterceptor {  
  
    @Override  
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)  
            throws Exception {  
        // 원하는 로직에 따라 데이터 소스 키를 선택합니다.  
        if (request.getRequestURL().toString().contains("/dev")) {  
            System.out.println("/dev");  
            DataSourceContextHolder.setDataSourceKey("devDataSource");  
        } else {  
            System.out.println("/prod");  
            DataSourceContextHolder.setDataSourceKey("prodDataSource");  
        }  
        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 {  
        DataSourceContextHolder.clearDataSourceKey();  
    }  
}

WebMvcConfigurerAdapter 에 Interceptor 등록

public class RpaViewWebMvcConfiguration extends WebMvcConfigurerAdapter {  
	...
  
    @Override  
    public void addInterceptors(InterceptorRegistry registry){  
        registry.addInterceptor(new DataSourceInterceptor()).addPathPatterns("/**");  
    }  
}

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연결문서

• SpringMVC