SpringBootインターセプターの簡単な実装

• インターセプター実装クラスを作成する

package com.example.helloworld.fAh;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class InterceptorDemo implements HandlerInterceptor {
    
    
    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
    
    
        System.out.printf("preHandle被调用\n");
        return true;
    }

    //请求处理之后进行调用，但是在视图被渲染之前（Controller方法调用之后）
    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
    
    
        System.out.println("postHandle被调用\n");
    }

    //在整个请求结束之后被调用，也就是在DispatcherServlet 渲染了对应的视图之后执行（主要是用于进行资源清理工作）
    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
    
    
        System.out.println("afterCompletion被调用\n");
    }

}

• 構成クラスを作成し、インターセプターを登録します

package com.example.helloworld.config;

import com.example.helloworld.fAh.InterceptorDemo;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class HandlerConfig implements WebMvcConfigurer {
    
    
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
    
    
        registry.addInterceptor(new InterceptorDemo()).addPathPatterns("/**").excludePathPatterns("/a.do");
    }

}