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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
/*
* 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
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();
}
}
如果需要添加多個攔截器，InterceptorRegistry registry.addInterceptor方法
public InterceptorRegistration addInterceptor(HandlerInterceptor interceptor) {
InterceptorRegistration registration = new InterceptorRegistration(interceptor);
this.registrations.add(registration);
return registration;
}
registrations是個數組結構，可以添加多個
3、自動義攔截器
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 {
//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億速云網站的支持！
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