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;@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; }} |
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服务器之家网站的支持！
原文链接：https://www.cnblogs.com/zwdx/archive/2018/09/19/9674497.html
