今天學習一下RESTFul api攔截 java
大概有三種方式web
1、經過Filter這個你們很熟悉了吧,這是java規範的一個過濾器,他會攔截請求。在springboot中通常有兩種配置方式。spring
這種過濾器攔截並不知道你用的是哪個Controller處理也不知道你用哪個方法處理。api
(1)第一種直接寫類實現這個接口。代碼以下這個要使用Component註解,當你你請求服務器的時候他會對每個請求進行處理。springboot
package com.nbkj.webFilter; import org.springframework.stereotype.Component; import javax.servlet.*; import java.io.IOException; import java.util.Date; @Component public class TimerFilter implements Filter { @Override public void init(FilterConfig filterConfig) throws ServletException { System.out.println("Time filter init"); } @Override public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { System.out.println("Time filter start"); long startTime = new Date().getTime(); filterChain.doFilter(servletRequest, servletResponse); System.out.println("time filter:"+(new Date().getTime()-startTime)); System.out.println("time filter finish"); } @Override public void destroy() { System.out.println("Time filter destroy"); } }
(2)第二種能夠在WebConfig中配置,這種配置方式爲了使用第三方的Filter沒有@Compont註解因此使用。代碼以下服務器
package com.nbkj.config; import com.nbkj.webFilter.TimerFilter; import org.springframework.boot.web.servlet.FilterRegistrationBean; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import java.util.ArrayList; import java.util.List; /** * Web配置 * * @author hsj * @Configuration 這個註解聲明這個類是配置類 * @create 2017-11-11 18:00 **/ @Configuration public class WebConfig { @Bean public FilterRegistrationBean timeFilter() { FilterRegistrationBean registrationBean = new FilterRegistrationBean(); TimerFilter timerFilter = new TimerFilter(); registrationBean.setFilter(timerFilter); List<String> urls = new ArrayList<>(); urls.add("/*"); registrationBean.setUrlPatterns(urls); return registrationBean; } }
2、使用Interceptor這種事spring框架本身帶的攔截器,代碼以下 它會處理本身寫的攔截器,也會攔截的攔截BasicErrorController框架
能夠拿處處理的Controller和拿處處理的方法 可是拿不到具體的請求參數。ide
package com.nbkj.interceptor; import org.springframework.stereotype.Component; import org.springframework.web.method.HandlerMethod; import org.springframework.web.servlet.HandlerInterceptor; import org.springframework.web.servlet.ModelAndView; import javax.persistence.Convert; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.util.Date; /** * this is spring interceptor * * @author hsj * @create 2017-11-11 18:16 **/ @Component public class TimeInterceptor implements HandlerInterceptor { /** * 控制器方法處理以前 * * @param httpServletRequest * @param httpServletResponse * @param handler * @return * @throws Exception */ @Override public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object handler) throws Exception { System.out.println("preHandle"); System.out.println(((HandlerMethod) handler).getBean().getClass().getName()); System.out.println(((HandlerMethod) handler).getMethod().getName()); httpServletRequest.setAttribute("startTime", new Date().getTime()); return false; } /** * 控制器方法處理以後 * 控制器方法調用不拋異常調用 * * @param httpServletRequest * @param httpServletResponse * @param o * @param modelAndView * @throws Exception */ @Override public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object handler, ModelAndView modelAndView) throws Exception { System.out.println("postHandle"); Long startTime = (Long) httpServletRequest.getAttribute("startTime"); System.out.println("time interceptor 耗時" + (new Date().getTime() - startTime)); } /** * 控制器方法拋不拋異常都會被調用 * * @param httpServletRequest * @param httpServletResponse * @param o * @param e * @throws Exception */ @Override public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception { System.out.println("afterCompletion"); Long startTime = (Long) httpServletRequest.getAttribute("startTime"); System.out.println("time interceptor 耗時" + (new Date().getTime() - startTime)); System.out.println("ex is" + e); } }
package com.nbkj.config; import com.nbkj.interceptor.TimeInterceptor; import com.nbkj.webFilter.TimerFilter; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.web.servlet.FilterRegistrationBean; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.web.servlet.config.annotation.InterceptorRegistry; import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter; import java.util.ArrayList; import java.util.List; /** * Web配置 * * @author hsj * @Configuration 這個註解聲明這個類是配置類 * @create 2017-11-11 18:00 **/ @Configuration public class WebConfig extends WebMvcConfigurerAdapter { @Autowired private TimeInterceptor timeInterceptor; @Override public void addInterceptors(InterceptorRegistry registry) { registry.addInterceptor(timeInterceptor); } }
3、使用Aspect切片,代碼以下post
使用環繞通知,切入要切入的類,當請求的時候回攔截下來,這樣能夠獲取攔截的方法的參數學習
package com.nbkj.aspect; import org.aspectj.lang.ProceedingJoinPoint; import org.aspectj.lang.annotation.Around; import org.aspectj.lang.annotation.Aspect; import org.springframework.stereotype.Component; import java.util.Date; /** * this is a acpect * 切入點 * 在那些方法上起做用 * 在何時起做用 * * @author hsj * @create 2017-11-11 20:52 **/ @Aspect @Component public class TimeAspect { @Around("execution(* com.nbkj.controller.UserController.*(..))") public Object handleControllerMethod(ProceedingJoinPoint proceedingJoinPoint) throws Throwable { System.out.println("time aspect start"); Object[] args = proceedingJoinPoint.getArgs(); for (Object arg : args) { System.out.println(arg.getClass().getName()); System.out.println("arg is " + arg); } long startTime = new Date().getTime(); Object obj = proceedingJoinPoint.proceed(); System.out.println("time aspect 耗時" + (new Date().getTime() - startTime)); System.out.println("time aspect end"); return obj; } }
過濾器(Filter) :能夠拿到原始的http請求,可是拿不到你請求的控制器和請求控制器中的方法的信息。
攔截器(Interceptor):能夠拿到你請求的控制器和方法,卻拿不到請求方法的參數。
切片 (Aspect) : 能夠拿到方法的參數,可是卻拿不到http請求和響應的對象