spring的filter、interception、aop对比
filter
在spring boot中定义filter实现filter方法。filter方法能够拿到执行的request和response,获取不到具体执行的controller
//@Component
public class TimeFilter implements Filter {
/* (non-Javadoc)
* @see javax.servlet.Filter#destroy()
*/
@Override
public void destroy() {
System.out.println("time filter destroy");
}
/* (non-Javadoc)
* @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest, javax.servlet.ServletResponse, javax.servlet.FilterChain)
*/
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
System.out.println("time filter start");
long start = new Date().getTime();
chain.doFilter(request, response);
System.out.println("time filter 耗时:"+ (new Date().getTime() - start));
System.out.println("time filter finish");
}
/* (non-Javadoc)
* @see javax.servlet.Filter#init(javax.servlet.FilterConfig)
*/
@Override
public void init(FilterConfig arg0) throws ServletException {
System.out.println("time filter init");
}
}
@Configuration
public class WebConfig extends WebMvcConfigurerAdapter {
@SuppressWarnings("unused")
@Autowired
private TimeInterceptor timeInterceptor;
@Override
public void addInterceptors(InterceptorRegistry registry) {
// registry.addInterceptor(timeInterceptor);
}
// @Bean
public FilterRegistrationBean timeFilter() {
FilterRegistrationBean registrationBean = new FilterRegistrationBean();
TimeFilter timeFilter = new TimeFilter();
registrationBean.setFilter(timeFilter);
// 指定哪些路径起作用
List urls = new ArrayList<>();
urls.add("/*");
registrationBean.setUrlPatterns(urls);
return registrationBean;
}
}
interception
spring boot中定义interception需要实现HandlerInterceptor，interception能够拿到具体是哪个方法执行的和requset、response。但是拿不到具体方法中的参数。
@Component
public class TimeInterceptor implements HandlerInterceptor {
/* (non-Javadoc)
* @see org.springframework.web.servlet.HandlerInterceptor#preHandle(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.lang.Object)
*/
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws Exception {
System.out.println("preHandle");
System.out.println(((HandlerMethod)handler).getBean().getClass().getName());
System.out.println(((HandlerMethod)handler).getMethod().getName());
request.setAttribute("startTime", new Date().getTime());
//返回的bool值，决定是否后面的方法是否执行
return true;
}
/* (non-Javadoc)
* @see org.springframework.web.servlet.HandlerInterceptor#postHandle(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.lang.Object, org.springframework.web.servlet.ModelAndView)
*/
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
ModelAndView modelAndView) throws Exception {
System.out.println("postHandle");
Long start = (Long) request.getAttribute("startTime");
System.out.println("time interceptor 耗时:"+ (new Date().getTime() - start));
}
/* (non-Javadoc)
* @see org.springframework.web.servlet.HandlerInterceptor#afterCompletion(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.lang.Object, java.lang.Exception)
*/
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
throws Exception {
System.out.println("afterCompletion");
Long start = (Long) request.getAttribute("startTime");
System.out.println("time interceptor 耗时:"+ (new Date().getTime() - start));
System.out.println("ex is "+ex);
}
}
aop
spring中定义aop需要指定切点，和执行逻辑。能够拿到具体方法的参数。但是获取不到request和response
//@Aspect
//@Component
public class TimeAspect {
//@Before()
//@After()
@Around("execution(* com.imooc.web.controller.UserController.*(..))")
public Object handleControllerMethod(ProceedingJoinPoint pjp) throws Throwable {
System.out.println("time aspect start");
Object[] args = pjp.getArgs();
for (Object arg : args) {
System.out.println("arg is "+arg);
}
long start = new Date().getTime();
Object object = pjp.proceed();
System.out.println("time aspect 耗时:"+ (new Date().getTime() - start));
System.out.println("time aspect end");
return object;
}
}
总结
filter:filter方法能够拿到执行的request和response,获取不到具体执行的controller
interception:interception能够拿到具体是哪个方法执行的和requset、response。但是拿不到具体方法中的参数。
Aop:能够拿到具体方法的参数,获取不到requset、response
他们之间执行的顺序:filter-> interception->@Around aop->具体执行的方法->产生异常->@Around aop->@ControllerAdvice 全局异常处理-> interception-> filter