SpringBoot实现过滤器和拦截器的方法

package com.example.recorddemo.filters;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;

public class MyFilter1 implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("初始化过滤器：" + filterConfig.getFilterName());
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        System.out.println("在请求之前做处理");

        if (servletRequest instanceof HttpServletRequest) {
            System.out.println("  URL:" + ((HttpServletRequest)servletRequest).getRequestURL());
        }

        // 调用filter链中的下一个filter
        filterChain.doFilter(servletRequest, servletResponse);
        
        System.out.println("在请求之后做处理");
    }

    @Override
    public void destroy() {
        System.out.println("销毁：MyFilter1");
    }
}

@Configuration
public class FilterConfiguration {
    @Bean
    public FilterRegistrationBean myFilter1(){
        MyFilter1 filter = new MyFilter1();
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(filter);
//        filterRegistrationBean.addUrlPatterns("/*");
//        filterRegistrationBean.setEnabled(true);
        return filterRegistrationBean;
    }
}

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;

@WebFilter(filterName = "myFilter2" ,urlPatterns = "/*")
public class MyFilter2 implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {}

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        // 调用filter链中的下一个filter
        filterChain.doFilter(servletRequest, servletResponse);

    }

    @Override
    public void destroy() {}
}

package com.example.recorddemo.interceptor;

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

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

/**
 * @author wangchao
 */
@Component
public class MyInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // handle可拿到执行方法的反射对象。
        System.out.println("preHandle: MyInterceptor");
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        // 对于RESTful 接口用处不大
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        // 可捕捉异常，但是springboot已经有了全局异常捕捉
    }
}

package com.example.recorddemo.configuration;

import com.example.recorddemo.interceptor.MyInterceptor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.config.annotation.InterceptorRegistration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

import javax.annotation.Resource;

/**
 * @author wangchao
 */
@Configuration
public class InterceptorConfiguration implements WebMvcConfigurer {
    @Resource
    MyInterceptor myInterceptor;

    /**
     * 添加拦截器
     * @param registry
     */
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(myInterceptor).addPathPatterns("/**");
    }
}

public InterceptorRegistration addInterceptor(HandlerInterceptor interceptor) {
        InterceptorRegistration registration = new InterceptorRegistration(interceptor);
        this.registrations.add(registration);
        return registration;
    }

preHandle-1, preHandle-2, postHandle-2, postHandle-1, afterCompletion-2, afterCompletion-1