一、数据库与表结构

1、日志表信息描述sysLog

2、sql语句

CREATE TABLE sysLog(
id VARCHAR(32) PRIMARY KEY,
visitTime TIMESTAMP,
username VARCHAR(50),
ip VARCHAR(30),
url VARCHAR(50),
executionTime INT,
method VARCHAR(200)
);

INSERT INTO syslog(visitTime,username,ip,url,executionTime,method) VALUES('2020-08-16 07:34:37','username','ip','url',1,'methodName')

DELIMITER $$
CREATE
    /*[DEFINER = { user | CURRENT_USER }]*/
    TRIGGER `orcl`.`id_sysLog_trigger` BEFORE INSERT
    ON `orcl`.`sysLog`
    FOR EACH ROW BEGIN
	SET new.id=REPLACE(UUID(),'-',''); -- 触发器执行的逻辑
    END$$
DELIMITER ;

3、实体类

public class SysLog {
	private String id;
	private Date visitTime;
	private String visitTimeStr;
	private String username;
	private String ip;
	private String url;
	private Long executionTime;
	private String method;

    public String getVisitTimeStr() {
        if (visitTime!=null){
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            visitTimeStr = sdf.format(visitTime);

        }
        return visitTimeStr;
    }
｝

二、基于AOP的日志处理（写入）

位置

1、创建切面类处理日志

@Component
@Aspect
public class LogAop {

    @Autowired
    private HttpServletRequest request;

    @Autowired
    private ISysLogService sysLogService;


    private Date visitTime;//开始的时间
    private Class clazz;//访问的类
    private Method method;//访问的方法

    //前置通知：主要获取开始时间，执行的类时哪一个，执行的是哪一个方法
    @Before("execution(* com.itheima.ssm.controller.*.*(..))")
    public void doBefore(JoinPoint jp) throws NoSuchMethodException {

        //第一次访问时间
        visitTime = new Date();
        //具体要访问的类
        clazz=jp.getTarget().getClass();


        //获取方法
        /*
            先获取访问名称，通过类反射得到method
         */
        String methodName = jp.getSignature().getName();//获取访问方法的名称
        Object[] args = jp.getArgs();//获取方法的参数
        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);
        }

    }
    //前置通知
    @After("execution(* com.itheima.ssm.controller.*.*(..))")
    public void doAfter(JoinPoint jp) throws Exception {

        //获取访问时长
        long time = new Date().getTime()-visitTime.getTime();

        //获取url
        /*
            涉及到反射和注解
         */
        String url = null;
        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地址
                    /*
                      1、web.xml中配置
                      <listener>
                            <listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
                      </listener>

                      2、在本类中注入
                       @Autowired
                        private HttpServletRequest request;
                     */
                    String ip = request.getRemoteAddr();
                    
                    //获取操作者
                    /*
                        从上下文中获取了当前登录的用户
                     */
                    SecurityContext context = SecurityContextHolder.getContext();
                    User user = (User) context.getAuthentication().getPrincipal();
                    String username = user.getUsername();
                    
                    //将日志封装到log对象
                    SysLog sysLog = new SysLog();

                    sysLog.setUsername(username);
                    sysLog.setIp(ip);
                    sysLog.setUrl(url);
                    sysLog.setVisitTime(visitTime);
                    sysLog.setExecutionTime(time);
                    sysLog.setMethod("[类名]"+clazz.getName()+"[方法名]"+method.getName());

                    sysLogService.save(sysLog);
                }
            }
        }
    }
}

分析：在切面类中我们需要获取登录用户的username，还需要获取ip地址，我们怎么处理？

username 获取
SecurityContextHolder获取
ip地址获取
ip地址的获取我们可以通过request.getRemoteAddr()方法获取到。
在Spring中可以通过RequestContextListener来获取request或session对象。

2、ISysLogDao

public interface ISysLogDao {

    @Insert("insert into syslog(visitTime,username,ip,url,executionTime,method) values(#{visitTime},#{username},#{ip},#{url},#{executionTime},#{method})")
    void save(SysLog sysLog) throws Exception;
}

二、基于AOP的日志处理（读取）

1、页面syslog-list.jsp

aside.jsp

syslog-list.jsp页面

2、SysLogController

@Controller
@RequestMapping("/sysLog")
public class SysLogController {

    @Autowired
    private ISysLogService sysLogService;
    @RequestMapping("/findAll.do")
    public ModelAndView findAll() throws Exception {
        ModelAndView mv = new ModelAndView();
        List<SysLog> sysLogList = sysLogService.findAll();

        mv.setViewName("syslog-list");
        mv.addObject("sysLogs",sysLogList);
        return mv;
    }
}

3、SysLogServiceImpl

@Service
@Transactional
public class SysLogServiceImpl implements ISysLogService {
    @Autowired
    private ISysLogDao sysLogDao;
    @Override
    public void save(SysLog sysLog) throws Exception {
        sysLogDao.save(sysLog);
    }

    @Override
    public List<SysLog> findAll() throws Exception {
        return sysLogDao.findAll();
    }
}

4、ISysLogDao

public interface ISysLogDao {

    @Insert("insert into syslog(visitTime,username,ip,url,executionTime,method) values(#{visitTime},#{username},#{ip},#{url},#{executionTime},#{method})")
    void save(SysLog sysLog) throws Exception;

    @Select("Select * from syslog order by visitTime desc")
    List<SysLog> findAll() throws Exception;
}