springboot环境下配置过滤器和拦截器

以前我们在配置过滤器和拦截器的时候，都是一个类继承一个接口，然后在xml中配置一下就ok

但是，但是，这是springboot的环境，没有xml的配置。所以我们还要继续学习啊啊啊啊啊~~~~~

先简单大致说明一下，过滤器我们可以直接在类上加上@Component注解实现，但是有些参数啥的还是不好配置，还是需要一个配置文件来搞，所以，spring给我们提供了一个注解，就相当于xml，然后每个方法返回一个对象用@Bean来标注，相当于<bean></bean>注解   看代码吧

TimeFilter.java

/**
 *
 */
package com.imooc.web.filter;

import java.io.IOException;
import java.util.Date;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

/**
 * @author 敲代码的卡卡罗特
 *
 */
//@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");
    }

}

TimeInterceptor.java

/**
 *
 */
package com.imooc.web.interceptor;

import java.util.Date;

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

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

/**
 * @author 敲代码的卡卡罗特
 *
 */
@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());
        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);

    }

}

WebConfig.java

/**
 *
 */
package com.imooc.web.config;

import java.util.ArrayList;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

import com.imooc.web.filter.TimeFilter;
import com.imooc.web.interceptor.TimeInterceptor;

/**
 * @author 敲代码的卡卡罗特
 *
 */
@Configuration
public class WebConfig extends WebMvcConfigurerAdapter {

    @SuppressWarnings("unused")
    @Autowired
    private TimeInterceptor timeInterceptor;

    @Override    //配置拦截器 必须继承WebMvcConfigurerAdapter
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(timeInterceptor);
    }

//    @Bean  //配置过滤器
    public FilterRegistrationBean timeFilter() {

        FilterRegistrationBean registrationBean = new FilterRegistrationBean();

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

        List<String> urls = new ArrayList<>();
        urls.add("/*");
        registrationBean.setUrlPatterns(urls);

        return registrationBean;

    }

}

原文地址：https://www.cnblogs.com/coder-lzh/p/8837515.html