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SpringBoot添加自定义拦截器的实现代码

在Controller层时，往往会需要校验或验证某些操作，而在每个Controller写重复代码，工作量比较大，这里在Springboot项目中 ，通过继承WebMvcConfigurerAdapter，添加拦截器。

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1、WebMvcConfigurerAdapter源码

/*
 * Copyright 2002-2016 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
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;
/**
 * An implementation of {@link WebMvcConfigurer} with empty methods allowing
 * subclasses to override only the methods they're interested in.
 *
 * @author Rossen Stoyanchev
 * @since 3.1
 */
public abstract class WebMvcConfigurerAdapter implements WebMvcConfigurer {
  /**
   * {@inheritDoc}
   * 
This implementation is empty.
   */
  @Override
  public void configurePathMatch(PathMatchConfigurer configurer) {
  }
  /**
   * {@inheritDoc}
   * 
This implementation is empty.
   */
  @Override
  public void configureContentNegotiation(ContentNegotiationConfigurer configurer) {
  }
  /**
   * {@inheritDoc}
   * 
This implementation is empty.
   */
  @Override
  public void configureAsyncSupport(AsyncSupportConfigurer configurer) {
  }
  /**
   * {@inheritDoc}
   * 
This implementation is empty.
   */
  @Override
  public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
  }
  /**
   * {@inheritDoc}
   * 
This implementation is empty.
   */
  @Override
  public void addFormatters(FormatterRegistry registry) {
  }
  /**
   * {@inheritDoc}
   * 
This implementation is empty.
   */
  @Override
  public void addInterceptors(InterceptorRegistry registry) {
  }
  /**
   * {@inheritDoc}
   * 
This implementation is empty.
   */
  @Override
  public void addResourceHandlers(ResourceHandlerRegistry registry) {
  }
  /**
   * {@inheritDoc}
   * 
This implementation is empty.
   */
  @Override
  public void addCorsMappings(CorsRegistry registry) {
  }
  /**
   * {@inheritDoc}
   * 
This implementation is empty.
   */
  @Override
  public void addViewControllers(ViewControllerRegistry registry) {
  }
  /**
   * {@inheritDoc}
   * 
This implementation is empty.
   */
  @Override
  public void configureViewResolvers(ViewResolverRegistry registry) {
  }
  /**
   * {@inheritDoc}
   * 
This implementation is empty.
   */
  @Override
  public void addArgumentResolvers(List argumentResolvers) {
  }
  /**
   * {@inheritDoc}
   * 
This implementation is empty.
   */
  @Override
  public void addReturnValueHandlers(List returnValueHandlers) {
  }
  /**
   * {@inheritDoc}
   * 
This implementation is empty.
   */
  @Override
  public void configureMessageConverters(List> converters) {
  }
  /**
   * {@inheritDoc}
   * 
This implementation is empty.
   */
  @Override
  public void extendMessageConverters(List> converters) {
  }
  /**
   * {@inheritDoc}
   * 
This implementation is empty.
   */
  @Override
  public void configureHandlerExceptionResolvers(List exceptionResolvers) {
  }
  /**
   * {@inheritDoc}
   * 
This implementation is empty.
   */
  @Override
  public void extendHandlerExceptionResolvers(List exceptionResolvers) {
  }
  /**
   * {@inheritDoc}
   * 
This implementation returns {@code null}.
   */
  @Override
  public Validator getValidator() {
    return null;
  }
  /**
   * {@inheritDoc}
   * 
This implementation returns {@code null}.
   */
  @Override
  public MessageCodesResolver getMessageCodesResolver() {
    return null;
  }
}

可以看出，该类 还能配置其他很多操作，例如异常处理，跨域请求等配置。

2、自动义Web配置类

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.WebMvcConfigurerAdapter;
@Configuration
public class WebMvcConfig extends WebMvcConfigurerAdapter {
  @Override
  public void addInterceptors(InterceptorRegistry registry) {
    registry.addInterceptor(getMyInterceptor()).addPathPatterns("/**");
  }
  @Bean
  public MyInterceptor getMyInterceptor(){
    return new MyInterceptor();
  }
}

如果需要添加多个拦截器，InterceptorRegistry registry.addInterceptor方法

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

registrations是个数组结构，可以添加多个

3、自动义拦截器

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;
public class MyInterceptor extends HandlerInterceptorAdapter {
  final Logger logger = LoggerFactory.getLogger(getClass());
  @Override
  public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
    //拦截操作
    return true;
  }
}

总结

以上所述是小编给大家介绍的SpringBoot添加自定义拦截器的实现代码，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对创新互联网站的支持！


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