SpringBoot环境自定义拦截器

最新推荐文章于 2023-07-12 17:41:28 发布

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本文详细解析了拦截器的概念及其在SpringBoot中的应用，包括如何定义与配置拦截器，实现请求前后的处理逻辑，如用户登录验证与日志记录。

什么是拦截器
拦截器(Interceptor): 用于在某个方法被访问之前进行拦截，然后在方法执行之前或之后加入某些操作，它通过动态拦截Action调用的对象，允许开发者定义在一个action执行的前后执行的代码，也可以在一个action执行前阻止其执行。同时也是提供了一种可以提取action中可重用的部分的方式。

拦截器作用
拦截用户的请求并进行相应的处理，比如：判断用户是否登陆，记录日志信息等

SpringBoot添加拦截器的方法

1、定义拦截器

package com.test.util;

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

import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

@Component
public class MyInterceptor implements HandlerInterceptor{

	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
			throws Exception {
		System.out.println("MyInterceptor preHandle request..."+request);
		return true;
	}

	@Override
	public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
			ModelAndView modelAndView) throws Exception {
		System.out.println("MyInterceptor postHandle request..."+request);
		
	}

	@Override
	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
			throws Exception {
		System.out.println("MyInterceptor afterCompletion request..."+request);
	}

}

2、配置拦截器

package com.test.util;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringBootConfiguration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

@SpringBootConfiguration
public class MySpringConfig extends WebMvcConfigurerAdapter{
	@Autowired
	private MyInterceptor myIntcpt;
	
	@Override
	public void addInterceptors(InterceptorRegistry registry)
	{
		registry.addInterceptor(myIntcpt).addPathPatterns("/**");
	}
}

日志信息

2018-12-18 21:32:29.866 DEBUG 18168 --- [nio-6060-exec-9] c.t.mapper.OrgModelMapper.getChildFunc   : ==> Parameters: 6(Integer)
2018-12-18 21:32:29.884 DEBUG 18168 --- [nio-6060-exec-9] c.t.mapper.OrgModelMapper.getChildFunc   : <==      Total: 0
2018-12-18 21:32:29.887 DEBUG 18168 --- [nio-6060-exec-9] c.t.mapper.OrgModelMapper.getChildFunc   : ==>  Preparing: select * from T_FUNCTION where parentid=? order by priority 
2018-12-18 21:32:29.887 DEBUG 18168 --- [nio-6060-exec-9] c.t.mapper.OrgModelMapper.getChildFunc   : ==> Parameters: 5(Integer)
2018-12-18 21:32:29.891 DEBUG 18168 --- [nio-6060-exec-9] c.t.mapper.OrgModelMapper.getChildFunc   : <==      Total: 0
MyInterceptor postHandle request...org.apache.catalina.connector.RequestFacade@5a31e8a0
MyInterceptor afterCompletion request...org.apache.catalina.connector.RequestFacade@5a31e8a0