@Aspect
作用是把当前类标识为一个切面供容器读取
@Pointcut
定义切入点
@Before
标识一个前置增强方法,相当于BeforeAdvice的功能,相似功能的还有
@AfterReturning
后置增强,相当于AfterReturningAdvice,方法正常退出时执行
@AfterThrowing
异常抛出增强,相当于ThrowsAdvice
@After
final增强,不管是抛出异常或者正常退出都会执行
@Around
环绕增强,相当于MethodInterceptor
@DeclareParents
引介增强,相当于IntroductionInterceptor
execution函数用于匹配方法执行的连接点,语法为:
execution(方法修饰符(可选) 返回类型 方法名 参数 异常模式(可选))
一、定义切入点
@Pointcut("execution(public * com.imooc.controller.Seller*.*(..))" +
"&& !execution(public * com.imooc.controller.SellerUserController.*(..))")
public void verify() {}
二、在RequestContextHolder中获取Request
三、在request中读取cookie和redis中的token
package com.imooc.aspect;
import com.imooc.constant.CookieConstant;
import com.imooc.constant.RedisConstant;
import com.imooc.exception.SellerAuthorizeException;
import com.imooc.utils.CookieUtil;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
@Aspect
@Component
@Slf4j
public class SellerAuthorizeAspect {
@Autowired
private StringRedisTemplate redisTemplate;
@Pointcut("execution(public * com.imooc.controller.Seller*.*(..))" +
"&& !execution(public * com.imooc.controller.SellerUserController.*(..))")
public void verify() {}
@Before("verify()")
public void doVerify() {
ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
HttpServletRequest request = attributes.getRequest();
//查询cookie
Cookie cookie = CookieUtil.get(request, CookieConstant.TOKEN);
if (cookie == null) {
log.warn("【登录校验】Cookie中查不到token");
throw new SellerAuthorizeException();
}
//去redis里查询
String tokenValue = redisTemplate.opsForValue().get(String.format(RedisConstant.TOKEN_PREFIX, cookie.getValue()));
if (StringUtils.isEmpty(tokenValue)) {
log.warn("【登录校验】Redis中查不到token");
throw new SellerAuthorizeException();
}
}
}
四、捕获异常处理
在SpringMVC重要注解(一)@ExceptionHandler
和@ResponseStatus
我们提到,如果单使用@ExceptionHandler
,只能在当前Controller中处理异常。但当配合@ControllerAdvice
一起使用的时候,就可以摆脱那个限制了。
package com.imooc.handler;
import com.imooc.VO.ResultVO;
import com.imooc.config.ProjectUrlConfig;
import com.imooc.exception.ResponseBankException;
import com.imooc.exception.SellException;
import com.imooc.exception.SellerAuthorizeException;
import com.imooc.utils.ResultVOUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.ResponseStatus;
import org.springframework.web.servlet.ModelAndView;
@ControllerAdvice
public class SellExceptionHandler {
@Autowired
private ProjectUrlConfig projectUrlConfig;
//拦截登录异常
//http://sell.natapp4.cc/sell/wechat/qrAuthorize?returnUrl=http://sell.natapp4.cc/sell/seller/login
@ExceptionHandler(value = SellerAuthorizeException.class)
@ResponseStatus(HttpStatus.FORBIDDEN)
public ModelAndView handlerAuthorizeException() {
return new ModelAndView("redirect:"
.concat(projectUrlConfig.getWechatOpenAuthorize())
.concat("/sell/wechat/qrAuthorize")
.concat("?returnUrl=")
.concat(projectUrlConfig.getSell())
.concat("/sell/seller/login"));
}
@ExceptionHandler(value = SellException.class)
@ResponseBody
public ResultVO handlerSellerException(SellException e) {
return ResultVOUtil.error(e.getCode(), e.getMessage());
}
@ExceptionHandler(value = ResponseBankException.class)
@ResponseStatus(HttpStatus.FORBIDDEN)
public void handleResponseBankException() {
}
}