SpringBoot2.X (二十): Spring Boot 自定义Intercepter

在SpringBoot1.X 中，使用拦截器， 一般会继承 WebMvcConfigurerAdapter 类，如下图所示：

但是在 SpringBoot2.X 中 ，WebMvcConfigurerAdapter 被deprecated ， 更好的做法是 implements WebMvcConfigurer

1、拦截器统一管理

package com.fxbin.demo.config;

import com.fxbin.demo.interceptor.MyInterceptor;
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.WebMvcConfigurer;

/**
 * created with IntelliJ IDEA.
 * author: fxbin
 * date: 2018/9/9
 * time: 14:46
 * description:
 */
@Configuration
public class WebConfig implements WebMvcConfigurer {

    @Bean
    public MyInterceptor myInterceptor(){
        return new MyInterceptor();
    }

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        //添加拦截路径和排除拦截路径
        registry.addInterceptor(myInterceptor()).addPathPatterns("/**").excludePathPatterns("/test");
    }
}

2、自定义拦截器

package com.fxbin.demo.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;

/**
 * created with IntelliJ IDEA.
 * author: fxbin
 * date: 2018/9/9
 * time: 14:48
 * description:
 */
@Component
public class MyInterceptor implements HandlerInterceptor {

    /**
     * 进入controller层之前拦截请求
     * @param request
     * @param response
     * @param handler
     * @return
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
        System.out.println("getContextPath:" + request.getContextPath());
        System.out.println("getServletPath:" + request.getServletPath());
        System.out.println("getRequestURI:" + request.getRequestURI());
        System.out.println("getRequestURL:" + request.getRequestURL());
        System.out.println("getRealPath:" + request.getSession().getServletContext().getRealPath("image"));
        return true;
    }


    /**
     * 处理请求完成后视图渲染之前的处理操作
     * @param request
     * @param response
     * @param handler
     * @param modelAndView
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) {

    }

    /**
     * 视图渲染之后的操作
     * @param request
     * @param response
     * @param handler
     * @param ex
     */
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {

    }
}

3、测试
由于我们设置了URI 是 /test 的话，会被跳过，所以先测试 http://localhost:8080/test 是否可以通过拦截器

测试通过，而 其它请求则会进入拦截器， 并且打印我们所期望的一些信息：