spring中过滤器(filter)、拦截器(interceptor)和切面(aop)的执行顺序

转自:https://blog.csdn.net/huxiaodong1994/article/details/82991828

1. 程序执行的顺序是先进过滤器,再进拦截器,最后进切面。注意:如果拦截器中preHandle方法返回的为false时,则无法进入切面,例子如下。

@RestController
@RequestMapping("/user")
public class UserController {
 
    @GetMapping("/{id:\\d+}")
    @JsonView(User.UserDetailView.class)
    public User getInfo(@PathVariable String id) {
        User user = new User();
        user.setUsername("tom");
        return user;
    }
}

编写方法的过滤器:


@Component
public class TimeFilter implements Filter {
 
    /* (non-Javadoc)
     * @see javax.servlet.Filter#init(javax.servlet.FilterConfig)
     */
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("time filter init");
 
    }
 
    /* (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:"+ (new Date().getTime() - start));
        System.out.println("time filter finish");
 
    }
 
    /* (non-Javadoc)
     * @see javax.servlet.Filter#destroy()
     */
    @Override
    public void destroy() {
        System.out.println("time filter destroy");
 
    }
}

编写方法的拦截器:

@Component
public class TimeInterceptor implements HandlerInterceptor {
 
    
    @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());
        return true;
    }
 
    
    @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));
    }
 
    
    @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);
    }
 
}

编写方法的切面:

@Aspect
@Component
public class TimeAspect {
 
    @Before("execution(public * com.hu.web.controller.UserController.*(..))")
    public Object handlerControllerMethod() throws Throwable {
        System.out.println("time aspect start");            
        return new Object();
    }
}

运行结果:1、当拦截器中preHandle的方法返回为true时:`


time filter start
preHandle
com.hu.web.controller.UserController$$EnhancerBySpringCGLIB$$b0bb0dcf
getInfo
time aspect start
postHandle
time interceptor 耗时:76
afterCompletion
time interceptor 耗时:76
ex is null
time filter:92
time filter finish
time filter start
time filter:46
time filter finish

2、当拦截器中preHandle的方法返回为false时:

time filter start
preHandle
com.hu.web.controller.UserController$$EnhancerBySpringCGLIB$$b0bb0dcf
getInfo
time filter:12
time filter finish
time filter start
time filter:23
time filter finish

2. 当程序有异常抛出时,回先进入切面,然后在进入自定义的ControllerAdvice中。

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