SpringCloud使用HandlerInterceptor攔截器

一、編寫自定義攔截器SignAutheInterceptor.class

preHandle：在業(yè)務處理器處理請求之前被調用。預處理，可以進行編碼、安全控制、權限校驗等處理；
postHandle：在業(yè)務處理器處理請求執(zhí)行完成后，生成視圖之前執(zhí)行。后處理（調用了Service并返回ModelAndView，但未進行頁面渲染），有機會修改ModelAndView （這個博主就基本不怎么用了）；
afterCompletion：在DispatcherServlet完全處理完請求后被調用，可用于清理資源等。返回處理（已經渲染了頁面）；

package com.xiaohang.socialcard.pre.intercepter;

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

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

/**
 * 自定義攔截器
 */
public class SignAutheInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        /**
         * 通過HttpServletRequest和HttpServletResponse做相應數(shù)據(jù)處理
         */
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}

二、配置攔截器InterceptorConfig.class

通過addPathPatterns屬性可配置需要進行攔截的請求路徑
通過excludePathPatterns屬性可配置不進行攔截的請求路徑

package com.xiaohang.socialcard.pre.intercepter;

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

/**
 * 配置攔截器
 */
@Configuration
public class InterceptorConfig extends WebMvcConfigurerAdapter {

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new SignAutheInterceptor()).addPathPatterns("/api/v1/get/getToken");
        super.addInterceptors(registry);
    }
}