我要评论在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
/*
* 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
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
您可能感兴趣的文章:
如您对本文有疑问或者有任何想说的，请点击进行留言回复，万千网友为您解惑！
网友评论