SpringBoot2 添加應用攔截器

項目參考：詳細參見：《Spring Boot 2精髓：從構建小系統到架構分布式大系統》 第三章 3.6.1節 攔截器

 

 

MyWebMvcConfigurer

package com.archibladwitwicke.springboot2.chapter03.configurer;

import com.archibladwitwicke.springboot2.chapter03.intercept.AdminLoginIntercept;
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 MyWebMvcConfigurer implements WebMvcConfigurer {

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        // 添加一個攔截器，連接以/admin為前綴的 url路徑
        registry.addInterceptor(new AdminLoginIntercept()).addPathPatterns("/admin/**");
    }
}

　　

TestAdminController

package com.archibladwitwicke.springboot2.chapter03.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
@RequestMapping("/admin")
public class TestAdminController {

    @RequestMapping("/hello")
    @ResponseBody
    public String say() {
        return "this is a admin page.";
    }
}

　　

AdminLoginIntecept

package com.archibladwitwicke.springboot2.chapter03.intercept;

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

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

public class AdminLoginIntercept implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 如果已經登錄返回true。
        // 如果沒有登錄沒有登錄，可以使用 reponse.send() 跳轉頁面。后面要跟return false,否則無法結束;

        // 為了測試，打印一句話
        System.out.println("訪問了admin下url路徑。");

        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 {

    }
}