SprinBoot拦截器

拦截器基本操作

声明一个拦截器类需要实现HandlerInterceptor接口

package com.cn.sola.intercepteor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

public class Myinterceptor implements HandlerInterceptor{
	
	private Logger log = LoggerFactory.getLogger(Myinterceptor.class);

	//操作前
	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
			throws Exception {
		
		HandlerMethod handlermethod = (HandlerMethod) handler;
		
		log.info("【****** MyInterceptor.preHandle ******】" + handlermethod.getBean().getClass().getSimpleName());
		// 如果返回false表示不继续请求，如果返回true表示继续请求
		return true;
	}
	//正在处理
	@Override
	public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
			ModelAndView modelAndView) throws Exception {
		
		HandlerMethod handlermethod = (HandlerMethod) handler;
		
		log.info("【****** MyInterceptor.postHandle ******】" + handlermethod.getBean().getClass().getCanonicalName());
		
		log.info("【****** MyInterceptor.postHandle ******】" + request.getServletPath());
	}
	//操作后
	@Override
	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
			throws Exception {
		
		log.info("【****** MyInterceptor.afterCompletion ******】" + "拦截处理完毕");
	}
	
}

在Config配置类注册一下基本拦截器

package com.cn.sola.config;

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

import com.cn.sola.intercepteor.Myinterceptor;

@SuppressWarnings("deprecation")
@Configuration
public class MyWebApplicationConfig extends WebMvcConfigurerAdapter{// 定义MVC配置

	@Override
	public void addInterceptors(InterceptorRegistry registry) {//注解拦截器
		
		registry.addInterceptor(new Myinterceptor()).addPathPatterns("/**");//拦截器路径
		
		super.addInterceptors(registry);
	}
}

运行即可

拦截器小应用 可以获取每个方法的执行时间

package com.cn.sola.intercepteor;

import java.util.Timer;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

public class Myinterceptor implements HandlerInterceptor{
	
	private Logger log = LoggerFactory.getLogger(Myinterceptor.class);
	
	private Long times;
	private Long timee;

	//操作前
	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
			throws Exception {
		
		times=System.currentTimeMillis();
		
		HandlerMethod handlermethod = (HandlerMethod) handler;
		
		log.info("【****** MyInterceptor.preHandle ******】" + handlermethod.getBean().getClass().getSimpleName());
		// 如果返回false表示不继续请求，如果返回true表示继续请求
		return true;
	}
	//正在处理
	@Override
	public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
			ModelAndView modelAndView) throws Exception {
		
		HandlerMethod handlermethod = (HandlerMethod) handler;
		
		log.info("【****** MyInterceptor.postHandle ******】" + handlermethod.getBean().getClass().getCanonicalName());
		
		log.info("【****** MyInterceptor.postHandle ******】" + request.getServletPath());
	}
	//操作后
	@Override
	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
			throws Exception {
		
		log.info("【****** MyInterceptor.afterCompletion ******】" + "拦截处理完毕");
		
		timee = System.currentTimeMillis();
		
		System.out.println(timee-times+"ms");
	}
	
}

AOP拦截器

首先添加依赖

		<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-aop -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-aop</artifactId>
			<version>2.0.3.RELEASE</version>
		</dependency>

编写一个切面类

package com.cn.sola.config;

import java.util.Arrays;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

@Aspect
@Component
public class ServiceAspect {//此时定义一个业务层拦截处理
	
	private Logger log = LoggerFactory.getLogger(ServiceAspect.class);

	//切面表达式 环绕
	@Around("execution(* com.cn.sola..service..*.*(..))")
	public Object arroundInvoke(ProceedingJoinPoint ponit) throws Throwable{
		
		//获取传递参数数组
		Object[] args = ponit.getArgs();
		
		this.log.info("【****** Service-Before ******】执行参数" + Arrays.toString(args));
		
		//执行放行
		Object object = ponit.proceed(args);
		
		this.log.info("【****** Service-After ******】执行参数" + object);
		
		return object;
		
	}
}