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。

1、webmvcconfigureradapter源码

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									/*

									 * 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}

									   * <p>this implementation is empty.

									   */

									  @override

									  public void configurepathmatch(pathmatchconfigurer configurer) {

									  }

									  /**

									   * {@inheritdoc}

									   * <p>this implementation is empty.

									   */

									  @override

									  public void configurecontentnegotiation(contentnegotiationconfigurer configurer) {

									  }

									  /**

									   * {@inheritdoc}

									   * <p>this implementation is empty.

									   */

									  @override

									  public void configureasyncsupport(asyncsupportconfigurer configurer) {

									  }

									  /**

									   * {@inheritdoc}

									   * <p>this implementation is empty.

									   */

									  @override

									  public void configuredefaultservlethandling(defaultservlethandlerconfigurer configurer) {

									  }

									  /**

									   * {@inheritdoc}

									   * <p>this implementation is empty.

									   */

									  @override

									  public void addformatters(formatterregistry registry) {

									  }

									  /**

									   * {@inheritdoc}

									   * <p>this implementation is empty.

									   */

									  @override

									  public void addinterceptors(interceptorregistry registry) {

									  }

									  /**

									   * {@inheritdoc}

									   * <p>this implementation is empty.

									   */

									  @override

									  public void addresourcehandlers(resourcehandlerregistry registry) {

									  }

									  /**

									   * {@inheritdoc}

									   * <p>this implementation is empty.

									   */

									  @override

									  public void addcorsmappings(corsregistry registry) {

									  }

									  /**

									   * {@inheritdoc}

									   * <p>this implementation is empty.

									   */

									  @override

									  public void addviewcontrollers(viewcontrollerregistry registry) {

									  }

									  /**

									   * {@inheritdoc}

									   * <p>this implementation is empty.

									   */

									  @override

									  public void configureviewresolvers(viewresolverregistry registry) {

									  }

									  /**

									   * {@inheritdoc}

									   * <p>this implementation is empty.

									   */

									  @override

									  public void addargumentresolvers(list<handlermethodargumentresolver> argumentresolvers) {

									  }

									  /**

									   * {@inheritdoc}

									   * <p>this implementation is empty.

									   */

									  @override

									  public void addreturnvaluehandlers(list<handlermethodreturnvaluehandler> returnvaluehandlers) {

									  }

									  /**

									   * {@inheritdoc}

									   * <p>this implementation is empty.

									   */

									  @override

									  public void configuremessageconverters(list<httpmessageconverter<?>> converters) {

									  }

									  /**

									   * {@inheritdoc}

									   * <p>this implementation is empty.

									   */

									  @override

									  public void extendmessageconverters(list<httpmessageconverter<?>> converters) {

									  }

									  /**

									   * {@inheritdoc}

									   * <p>this implementation is empty.

									   */

									  @override

									  public void configurehandlerexceptionresolvers(list<handlerexceptionresolver> exceptionresolvers) {

									  }

									  /**

									   * {@inheritdoc}

									   * <p>this implementation is empty.

									   */

									  @override

									  public void extendhandlerexceptionresolvers(list<handlerexceptionresolver> exceptionresolvers) {

									  }

									  /**

									   * {@inheritdoc}

									   * <p>this implementation returns {@code null}.

									   */

									  @override

									  public validator getvalidator() {

									    return null;

									  }

									  /**

									   * {@inheritdoc}

									   * <p>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

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									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

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									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

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									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;

									  }

									}