SpringBoot系列<七>拦截器配置

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本文介绍了如何在SpringBoot项目中创建和配置拦截器，包括两个拦截器类的实现及拦截器配置类的详细说明。执行顺序遵循添加顺序，先执行myInterceptorTwo，再执行myInterceptor。

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SpringBoot的拦截器实现和SpringMVC一致，就是配置方式不一样，完成代码如下:

一、新建两个拦截器类

package com.jd.m.tg.interceptor;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
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;

@Component
public class MyInterceptor implements HandlerInterceptor {

    private static final Logger LOG= LoggerFactory.getLogger(MyInterceptor.class);

    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
        LOG.info("执行拦截器的preHandle方法");
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
        LOG.info("执行拦截器的postHandle方法");
    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
        LOG.info("执行拦截器的afterCompletion方法");
    }
}

另一个拦截器类和该类内容一致；

二、拦截器配置类

package com.jd.m.tg.config;

import com.jd.m.tg.interceptor.MyInterceptor;
import com.jd.m.tg.interceptor.MyInterceptorTwo;
import lombok.AllArgsConstructor;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

@Configuration
@AllArgsConstructor
public class InterceptorConfig extends WebMvcConfigurerAdapter{

    private MyInterceptor myInterceptor;

    private MyInterceptorTwo myInterceptorTwo;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(myInterceptorTwo).addPathPatterns("/test/**");
        registry.addInterceptor(myInterceptor).addPathPatterns("/test/**");
    }
}

拦截器的添加顺序就是执行顺序，如上所示，第一个拦截器是myInterceptorTwo，第二个拦截器是myInterceptor；

控制台执行日志如下：

c.jd.m.tg.interceptor.MyInterceptorTwo   : 执行拦截器的preHandle方法
2017-12-19 11:18:50.237  INFO 8988 --- [0.0.1-80-exec-1] com.jd.m.tg.interceptor.MyInterceptor    : 执行拦截器的preHandle方法
2017-12-19 11:18:50.255  INFO 8988 --- [0.0.1-80-exec-1] com.jd.m.tg.interceptor.MyInterceptor    : 执行拦截器的postHandle方法
2017-12-19 11:18:50.255  INFO 8988 --- [0.0.1-80-exec-1] c.jd.m.tg.interceptor.MyInterceptorTwo   : 执行拦截器的postHandle方法
2017-12-19 11:18:50.255  INFO 8988 --- [0.0.1-80-exec-1] com.jd.m.tg.interceptor.MyInterceptor    : 执行拦截器的afterCompletion方法
2017-12-19 11:18:50.255  INFO 8988 --- [0.0.1-80-exec-1] c.jd.m.tg.interceptor.MyInterceptorTwo   : 执行拦截器的afterCompletion方法