SpringBoot新增自訂攔截器的方法實作（程式碼）

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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寫重複程式碼，工作量比較大，這裡在Springboot專案中，透過繼承WebMvcConfigurerAdapter，添加攔截器。

1、WebMvcConfigurerAdapter原始碼

/*
 * 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，該類別 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設定類別

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();
    }
    


}

　　如果需要新增多個攔截器，InterceptorRegistry registry.addInterceptor方法

public InterceptorRegistration addInterceptor(HandlerInterceptor interceptor) {
        InterceptorRegistration registration = new InterceptorRegistration(interceptor);        
        this.registrations.add(registration);        
        return registration;
    }

registrations是個陣列結構，可以新增多個

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 {
        //拦截操作
        return true;
    }
    
}

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