一.采用功能最强的环绕通知

   

@Component@Aspectpublic class LogAop {    @Autowired    private HttpServletRequest request;    @Autowired    private ISysLogService sysLogService;    /**     * 记录日志环绕通知     * @param pjp     * @return     * @throws Throwable     */    @Around("execution(* cn.itcast.controller.*Controller.*(..))")    public Object around(ProceedingJoinPoint pjp) throws Throwable {        SysLog sysLog = new SysLog();        long startTime = System.currentTimeMillis();        String uri = request.getRequestURI();//获取路径uri        String ip = request.getRemoteAddr();//获取ip        String className = pjp.getTarget().getClass().getName();//获取类名        String methodName = pjp.getSignature().getName();//获取方法名        String username = SecurityContextHolder.getContext().getAuthentication().getName();//用springsecurity获取用户名 //放行        Object[] args = pjp.getArgs();        Object proceed = pjp.proceed(args);        //放行后         long endTime = System.currentTimeMillis();        long executionTime=endTime-startTime;        sysLog.setExecutionTime(executionTime);        sysLog.setIp(ip);        sysLog.setMethod(className+"."+methodName);        sysLog.setUrl(uri);        sysLog.setVisitTime(new Date());        sysLog.setUsername(username);        sysLogService.save(sysLog);//存储日志到数据库中 return proceed; //返回原方法的返回值    }} //环绕通知,注意方法有返回值

2.前置通知与后置通知

 

//不必在乎内容,理解格式流程就行 @Component@Aspectpublic class LogAop {    @Autowired    private HttpServletRequest request;    @Autowired    private ISysLogService sysLogService;    private Date visitTime; //开始时间    private Class clazz; //访问的类    private Method method;//访问的方法    //前置通知  主要是获取开始时间，执行的类是哪一个，执行的是哪一个方法    @Before("execution(* com.itheima.ssm.controller.*.*(..))")    public void doBefore(JoinPoint jp) throws NoSuchMethodException {
             visitTime = new Date();//当前时间就是开始访问的时间        clazz = jp.getTarget().getClass(); //具体要访问的类        String methodName = jp.getSignature().getName(); //获取访问的方法的名称        Object[] args = jp.getArgs();//获取访问的方法的参数        //获取具体执行的方法的Method对象        if (args == null || args.length == 0) {            method = clazz.getMethod(methodName); //只能获取无参数的方法        } else {            Class[] classArgs = new Class[args.length];            for (int i = 0; i < args.length; i++) {                classArgs[i] = args[i].getClass();            }            clazz.getMethod(methodName, classArgs);        }    }    //后置通知    @After("execution(* com.itheima.ssm.controller.*.*(..))")    public void doAfter(JoinPoint jp) throws Exception {        long time = new Date().getTime() - visitTime.getTime(); //获取访问的时长        String url = "";        //获取url        if (clazz != null && method != null && clazz != LogAop.class) {            //1.获取类上的@RequestMapping("/orders")            RequestMapping classAnnotation = (RequestMapping) clazz.getAnnotation(RequestMapping.class);            if (classAnnotation != null) {                String[] classValue = classAnnotation.value();                //2.获取方法上的@RequestMapping(xxx)                RequestMapping methodAnnotation = method.getAnnotation(RequestMapping.class);                if (methodAnnotation != null) {                    String[] methodValue = methodAnnotation.value();                    url = classValue[0] + methodValue[0];                    //获取访问的ip                    String ip = request.getRemoteAddr();                    //获取当前操作的用户                    SecurityContext context = SecurityContextHolder.getContext();//从上下文中获了当前登录的用户                    User user = (User) context.getAuthentication().getPrincipal();                    String username = user.getUsername();                    //将日志相关信息封装到SysLog对象                    SysLog sysLog = new SysLog();                    sysLog.setExecutionTime(time); //执行时长                    sysLog.setIp(ip);                    sysLog.setMethod("[类名] " + clazz.getName() + "[方法名] " + method.getName());                    sysLog.setUrl(url);                    sysLog.setUsername(username);                    sysLog.setVisitTime(visitTime);                    //调用Service完成操作                    sysLogService.save(sysLog);                }            }        }    }}