spring-boot添加自定义拦截器

spring-boot中的WebMvcConfigurerAdapter类提供了很多自定义操作的方法，先贴出来大家看看

package org.springframework.web.servlet.config.annotation;

import java.util.List;
import org.springframework.format.FormatterRegistry;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.validation.MessageCodesResolver;
import org.springframework.validation.Validator;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.HandlerMethodReturnValueHandler;
import org.springframework.web.servlet.HandlerExceptionResolver;

public abstract class WebMvcConfigurerAdapter implements WebMvcConfigurer {
    public WebMvcConfigurerAdapter() {
    }
        
    public void configurePathMatch(PathMatchConfigurer configurer) {
    }

    public void configureContentNegotiation(ContentNegotiationConfigurer configurer) {
    }

    public void configureAsyncSupport(AsyncSupportConfigurer configurer) {
    }

    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
    }

    public void addFormatters(FormatterRegistry registry) {
    }

    public void addInterceptors(InterceptorRegistry registry) {
    }

    public void addResourceHandlers(ResourceHandlerRegistry registry) {
    }

    public void addCorsMappings(CorsRegistry registry) {
    }

    public void addViewControllers(ViewControllerRegistry registry) {
    }

    public void configureViewResolvers(ViewResolverRegistry registry) {
    }

    public void addArgumentResolvers(List<HandlerMethodArgumentResolver> argumentResolvers) {
    }

    public void addReturnValueHandlers(List<HandlerMethodReturnValueHandler> returnValueHandlers) {
    }

    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
    }

    public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
    }

    public void configureHandlerExceptionResolvers(List<HandlerExceptionResolver> exceptionResolvers) {
    }

    public void extendHandlerExceptionResolvers(List<HandlerExceptionResolver> exceptionResolvers) {
    }

    public Validator getValidator() {
        return null;
    }

    public MessageCodesResolver getMessageCodesResolver() {
        return null;
    }
}

如上代码的实现都是空的，也就是说我们想要完成自定义一些操作，只需要重写这个类中对应的方法，就可以实现

比如昨晚写了篇自定义springboot的消息转换器 ，其中的一种实现就是通过重写这个类的方法

下边贴一下重写addInterceptors从而实现自定义拦截器的demo

package com.itcast.springboot;

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

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

/**
 * @Author : Hellxz
 * @Description:自定义拦截器
 * @Date : 2018/4/8 12:36
 */
@Configuration
public class MyInterceptor extends WebMvcConfigurerAdapter {
    /**
     * @Author: Hellxz
     * @Description: 添加自定义拦截器
     * @Date: 2018/4/8 12:39
     */
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        /**
         * 自定义handlerInterceptor,匿名内部类，也可以单独提出来一个类
         */
        HandlerInterceptor handlerInterceptor = new HandlerInterceptor() {
            @Override
            public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
                System.out.println("—————进入拦截器");
                return true;
            }

            @Override
            public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
            }

            @Override
            public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
            }
        };
        //将这个handler添加到签名认证拦截器中
        registry.addInterceptor(handlerInterceptor);
//        添加拦截uri
//        registry.addInterceptor(handlerInterceptor).addPathPatterns("/user/**");
        super.addInterceptors(registry);
    }

}