在這裡我就不細說它的原理什麼的了,具體原理看這個Filter和攔截器的區別

https://blog.csdn.net/kxj19980524/article/details/85316586

SpringBoot使用步驟

先建立一個interceptor實現HandlerInterceptor,或者繼承HandlerInterceptorAdapter並且讓ioc管理,一般使用實現的方式.

package com.buba.interceptor;

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

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

@Component
public class OneInterceptor implements HandlerInterceptor {

    //目標方法執行前執行,
    //return false,目標方法就不執行了
    //如果方法發生異常,後面的程式也不會執行了
    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
        System.out.println("目標方法執行前執行");
        return true;
    }
    //目標方法執行後執行
    //在檢視解析器前執行
    //可以在這裡更改返回到哪個檢視,因為方法的引數帶有modelandview
    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
        System.out.println("目標方法後,檢視解析器前執行");
    }

    //目標方法後,試圖解析器後,
    // 這裡可得到執行controller時的異常資訊
    // 這裡可記錄操作日誌
    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
        System.out.println("目標方法後,檢視解析器後執行");
    }
} 
 

然後寫一個配置類繼承WebMvcConfigurerAdapter類，並重寫addInterceptors()方法,把自己寫的攔截器注入進去, 然後方法攔截器註冊類中,就可以使用了

package com.buba.configuration;

        import org.springframework.beans.factory.annotation.Autowired;
        import org.springframework.boot.SpringBootConfiguration;
        import org.springframework.web.servlet.HandlerInterceptor;
        import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
        import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

@SpringBootConfiguration
public class InterceptorConfiguration extends WebMvcConfigurerAdapter {
    @Autowired
    private HandlerInterceptor interceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(interceptor).addPathPatterns("/**").excludePathPatterns("");
        //addPathPatterns("/**")  這是攔截那些路徑
        //excludePathPatterns("")這是放行那些路徑,可以加多個這方法,接著點就行
    }
}
 

SpringMVC使用步驟 

還是建立一個攔截器類跟上面一樣

然後在springmvc的配置檔案中加攔截器的配置

<!-- 配置攔截器-->
 <mvc:interceptors>
    <!-- 許可權攔截器-->
     <mvc:interceptor>
         <mvc:mapping path="/**"/>
         <!--放行靜態資源-->
         <mvc:exclude-mapping path="/css/**"/>
         <mvc:exclude-mapping path="/demo/**"/>
         <mvc:exclude-mapping path="/easyUI/**"/>
         <mvc:exclude-mapping path="/images/**"/>
         <mvc:exclude-mapping path="/js/**"/>
         <ref bean="loginInterceptor"/>   //這個是把自己定義的攔截器注入進來
     </mvc:interceptor>
 </mvc:interceptors>