在controller層時，往往會需要校驗或驗證某些操作，而在每個controller寫重復代碼，工作量比較大，這里在springboot項目中 ，通過繼承webmvcconfigureradapter，添加攔截器。
1、webmvcconfigureradapter源碼
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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，該類 還能配置其他很多操作，例如異常處理，跨域請求等配置。
2、自動義web配置類
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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;@configurationpublic class webmvcconfig extends webmvcconfigureradapter { @override public void addinterceptors(interceptorregistry registry) { registry.addinterceptor(getmyinterceptor()).addpathpatterns("/**"); } @bean public myinterceptor getmyinterceptor(){ return new myinterceptor(); }} |
如果需要添加多個攔截器，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是個數組結構，可以添加多個
3、自動義攔截器
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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 { //攔截操作 return true; }} |
總結
以上所述是小編給大家介紹的springboot添加自定義攔截器的實現代碼，希望對大家有所幫助，如果大家有任何疑問請給我留言，小編會及時回復大家的。在此也非常感謝大家對服務器之家網站的支持！
原文鏈接：https://www.cnblogs.com/zwdx/archive/2018/09/19/9674497.html
