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 spring-boot中通过标签@Aspect ，@Component将类作为切面类，比如日志打印，在特定方法执行前后，执行切面里面方法。

package com.zhou.wenda.aspect;import org.aspectj.lang.JoinPoint;import org.aspectj.lang.annotation.After;import org.aspectj.lang.annotation.Aspect;import org.aspectj.lang.annotation.Before;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.stereotype.Component;import java.util.Date;/** * @author liangzhenzhou * @create 2018-10-23 22:24 */@Aspect@Componentpublic class LogAspect {    private static final Logger logger = LoggerFactory.getLogger(LogAspect.class);    //拦截制定所有controller，方法执行前执行    @Before("execution(* com.zhou.wenda.controller.*Controller.*(..))")    public void beforeMethod(JoinPoint joinPoint) {        StringBuilder sb = new StringBuilder();    //打印出调用参数        for (Object arg : joinPoint.getArgs()) {            if(arg!=null) {                sb.append("arg:" + arg.toString() + "|");            }        }        logger.info("before method:" + sb.toString());    }         //拦截制定IndexController，方法执行前执行    @After("execution(* com.zhou.wenda.controller.IndexController.*(..))")    public void afterMethod() {        logger.info("after method" + new Date());    }}

package com.zhou.wenda.controller;import com.zhou.wenda.model.User;import com.zhou.wenda.service.WendaService;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.http.HttpStatus;import org.springframework.stereotype.Controller;import org.springframework.ui.Model;import org.springframework.web.bind.annotation.*;import org.springframework.web.servlet.view.RedirectView;import javax.servlet.http.Cookie;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import java.util.*;/** * @author liangzhenzhou * @create 2018-10-17 21:22 *///@Controllerpublic class IndexController {    private static final Logger logger = LoggerFactory.getLogger(IndexController.class);    @Autowired    WendaService wendaService;    @RequestMapping(path = {"/", "/index"}, method = {RequestMethod.GET})    @ResponseBody    public String index(HttpSession httpSession) {        logger.info("VISIT HOME");        return wendaService.getMessage(2) + "Hello NowCoder" + httpSession.getAttribute("msg");    }    @RequestMapping(path = {"/profile/{groupId}/{userId}"})    @ResponseBody    public String profile(@PathVariable("userId") int userId,                          @PathVariable("groupId") String groupId,                          @RequestParam(value = "type", defaultValue = "1") int type,                          @RequestParam(value = "key", required = false) String key) {        return String.format("Profile Page of %s / %d, t:%d k: %s", groupId, userId, type, key);    }    @RequestMapping(path = {"/vm"}, method = {RequestMethod.GET})    public String template(Model model) {        model.addAttribute("value1", "vvvvv1");        List
   
     colors = Arrays.asList(new String[]{"RED", "GREEN", "BLUE"});        model.addAttribute("colors", colors);        Map
    
      map = new HashMap<>();        for (int i = 0; i < 4; ++i) {            map.put(String.valueOf(i), String.valueOf(i * i));        }        model.addAttribute("map", map);        model.addAttribute("user", new User("LEE"));        return "home";    }    @RequestMapping(path = {"/request"}, method = {RequestMethod.GET})    @ResponseBody    public String request(Model model, HttpServletResponse response,                          HttpServletRequest request,                          HttpSession httpSession,                          @CookieValue("JSESSIONID") String sessionId) {        StringBuilder sb = new StringBuilder();        sb.append("COOKIEVALUE:" + sessionId+"
     
");        Enumeration
     
       headerNames = request.getHeaderNames();        while (headerNames.hasMoreElements()) {            String name = headerNames.nextElement();            sb.append(name + ":" + request.getHeader(name) + "
      
");        }        if (request.getCookies() != null) {            for (Cookie cookie : request.getCookies()) {                sb.append("Cookie:" + cookie.getName() + " value:" + cookie.getValue());            }        }        sb.append(request.getMethod() + "
      
");        sb.append(request.getQueryString() + "
      
");        sb.append(request.getPathInfo() + "
      
");        sb.append(request.getRequestURI() + "
      
");        response.addHeader("nowcoderId", "hello");        response.addCookie(new Cookie("username", "nowcoder"));        return sb.toString();    }    @RequestMapping(path = {"/redirect/{code}"}, method = {RequestMethod.GET})    public RedirectView redirect(@PathVariable("code") int code,                                 HttpSession httpSession) {        httpSession.setAttribute("msg", "jump from redirect");        RedirectView red = new RedirectView("/", true);        if (code == 301) {            red.setStatusCode(HttpStatus.MOVED_PERMANENTLY);        }        return  red;    }    @RequestMapping(path = {"/admin"}, method = {RequestMethod.GET})    @ResponseBody    public String admin(@RequestParam("key") String key) {        if ("admin".equals(key)) {            return "hello admin";        }        throw  new IllegalArgumentException("参数不对");    }    @ExceptionHandler()    @ResponseBody    public String error(Exception e) {        return "error:" + e.getMessage();    }}
     
    
   

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