五、基于Spring Aop的方式实现项目的登录拦截认证

　一、比较简单，自定义一Aop拦截类

package com.cg.demo.config.aspect;

import com.cg.demo.entity.User;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.HashMap;
import java.util.List;

/**
 * 说明:
 *
 * @auther panhh
 * @date 2019/7/12 10:50
 */
@Aspect
@Component
public class LoginAspect {

    @Pointcut(value = "execution(public * com.cg.demo.web.user..*.*(..)))")
    public void pointCutMethod(){
    }

    @Around(value = "pointCutMethod()")
    public Object doAround(ProceedingJoinPoint pjp) throws Throwable {
        System.out.println("doAroundMethod 前置通知~~~~");

        //获取session
        HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder
                .getRequestAttributes())
                .getRequest();
        HttpServletResponse response = ((ServletRequestAttributes) RequestContextHolder
                .getRequestAttributes()).getResponse();
        HttpSession session = request.getSession();
        Object acc_token = session.getAttribute("acc_token");
        if (acc_token == null){
            return "redirect:/login";
        }

        //获取传入参数
        //getParam(pjp);

        //proceed 是方法的返回值
        Object proceed = pjp.proceed();
        System.out.println("proceed-->"+proceed.toString());

        return proceed;
    }

    /**
     * 获取请求参数
     * @param pjp
     */
    private void getParam(ProceedingJoinPoint pjp) {
        HashMap<Object, Object> map = new HashMap<>();
        Object[] args = pjp.getArgs();
        System.out.println(args.toString());
        String[] paramNames = ((MethodSignature)pjp.getSignature()).getParameterNames();
        for (int i = 0;i < args.length;i++){
            if(args[i] instanceof User){
                map.put(paramNames[i],args[i]);
            }
        }
        System.out.println("map--->"+map);
        User user = (User) map.get("user");
        System.out.println("user--->"+user);
    }
}

二、项目包结构
　　user包下相当于资源包（会被aop拦截的内容）
　　login登录包不拦截

 三、pom.xml文件

　　

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.6.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.cg.demo</groupId>
    <artifactId>some_demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>some_demo</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.postgresql</groupId>
            <artifactId>postgresql</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <!-- swagger2 -->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>2.9.2</version>
        </dependency>

        <!-- swagger-ui -->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <version>2.9.2</version>
        </dependency>

        <!--Aop-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-aop</artifactId>
        </dependency>
        <!--mybatis-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>