拦截请求并记录相应信息-springboot

方式：

1、FIlter过滤器

2、interceptor拦截器

3、Aspect切片

一、Filter过滤器形式

　　只能处理request中的数据  不能确定请求要走的是哪个controller信息

1、过滤器实现第一种方式

package com.nxz.filter;

import org.springframework.stereotype.Component;

import javax.servlet.*;
import java.io.IOException;
import java.util.Date;

// Filter 是javax.servlet下的
@Component //让自定义filter起作用，只需要让springcontext管理起来即可
public class TimeFilter 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 time = new Date().getTime();
        filterChain.doFilter(servletRequest, servletResponse);
        System.out.println("消耗时间：" + (new Date().getTime() - time));
        System.out.println("time filter start");
    }

    @Override
    public void destroy() {
        System.out.println("time filter destroy");
    }
}

当项目启动的时候会在控制台输出：time filter init

当访问localhost:8080/user/1时：进入拦截器

结束结束后：

time filter start
进入getinfo服务
消耗时间：
time filter end

2、filter过滤器第二种方式

package com.nxz.filter;

import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class WebConfig {

    @Bean
    public FilterRegistrationBean timeFilter(){

        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();

        TimeFilter timeFilter = new TimeFilter();
        filterRegistrationBean.setFilter(timeFilter);

        //指定什么样的请求回走timefilter过滤器
        filterRegistrationBean.addUrlPatterns("/*");
        return filterRegistrationBean;
    }
}

二、inteceptor拦截器

　　只能处理到类中的方法，但是不能记录方法的参数是什么

package com.nxz.inteceptor;

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.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Date;

@Component
public class TimeInteceptor implements HandlerInterceptor {

    //在controller调用之前调用
    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
        System.out.println("preHandler");

        System.out.println(((HandlerMethod) o).getBean().getClass().getName());//输出类名
        System.out.println(((HandlerMethod) o).getMethod().getName());//输出方法名

        //为了在prehandler方法和posthandler方法之间传递信息，可以将数据放到request中
        httpServletRequest.setAttribute("startTime", new Date().getTime());
        return false;
    }

    //在controller调用之后调用，如果controller中抛出异常，这个方法不会调用
    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
        System.out.println("postHandle");
        Long start = (Long) httpServletRequest.getAttribute("startTime");
        System.out.println("time interceptor 耗时：" + (new Date().getTime() - start));
    }

    //无论controller是否抛出异常，都会调用
    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
        System.out.println("afterCompletion");
        Long start = (Long) httpServletRequest.getAttribute("startTime");
        System.out.println("time interceptor 耗时：" + (new Date().getTime() - start));
        System.out.println("ex is :" + e);
    }
}

interceptor实现拦截功能还需要配置webconfig

package com.nxz.config;

import com.nxz.filter.TimeFilter;
import com.nxz.inteceptor.TimeInteceptor;
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;

@Configuration
public class WebConfig extends WebMvcConfigurerAdapter {

    @Autowired
    private TimeInteceptor timeInteceptor;
    //自定义的interceptor 要起作用的话 需要继承webmvcConfigurerAdater ，重写addInterceptors
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(timeInteceptor);
    }
}

访问localhost:8080/user/1后，输入日志：

preHandler
com.nxz.controller.UserController
getInfo
进入getinfo服务
postHandle
time interceptor 耗时：
afterCompletion
time interceptor 耗时：
ex is :null

三、切片Aspect（AOP）  -- 切入点（注解）、增强（方法）

　　需要导入aop依赖

package com.nxz.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;

@Aspect
@Component
public class TimeAspect {

    //@Before @After @AfterThrowing @Around 基本的aop注解

    @Around("execution(* com.nxz.controller.UserController.*(..))")
    public Object handlerControllerMehtod(ProceedingJoinPoint joinPoint) throws Throwable {

        System.out.println("time aspect start");

        Object[] args = joinPoint.getArgs();
        for (Object arg : args) {
            System.out.println(arg);
        }

        Long time = new Date().getTime();
        Object obj = joinPoint.proceed();

        System.out.println("time aspect end,耗时：" + (new Date().getTime() - time));

        return obj;
    }

}

访问地址后：

time aspect start
1   --》请求参数
进入getinfo服务
time aspect end,耗时：

几种方式起作用的顺序：

====

Usercontroller：

    @GetMapping("/{id:\\d+}")
    @JsonView(User.UserDetailView.class)
    public User getInfo(@PathVariable String id) {
        System.out.println("进入getinfo服务");
        User user = new User();
        user.setUsername("tom");
        return user;
    }