Spring AOP 最常用的地方之一就是記錄日誌，這裡記錄除了記錄日誌描述外，還記錄了方法請求的引數，並將記錄儲存到資料庫。這裡用到了自定義註解，使用如下

1. 建立 log 日誌類，並生產相應的pojo，pojo如下

public class OperationLog implements Serializable {

    /**
     * 
     */
    private static final long serialVersionUID = 7087799444017468909L;
    private Integer id;
    private String userId;
    private
 
 String operatType;
    private String content;
    private String remarks;
    private Date create;

    // getXXX()和setXXX()省略
}

2. 建立註解類 SystemServiceLog

/**
 * AOP 日誌記錄，自定義註解
 * @author xxx
 * @since JDK1.8
 */
@Target({ElementType.PARAMETER, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
 

public @interface SystemServiceLog {

    // 日誌描述
    String description() default "";

    // 操作型別
    int tableType() default 0;
}

省略建立dao和service的程式碼

3. 建立攔截方法，這裡只在請求前攔截

@Aspect
@Component
public class SystemLogAspect {

    @Autowired 
    private OperationLogService operationLogService;

    @Pointcut
 
("@annotation(com.xxx.common.annotation.SystemServiceLog)")
    public void serviceAspect() {

    }


    @After("serviceAspect()")
    public void doServiceLog(JoinPoint joinPoint) {
        // 獲取使用者資訊
        Session session = SecurityUtils.getSubject().getSession();
        UserInfo user = (UserInfo) session.getAttribute(ShiroDbRealm.SESSIOIN_USER_KEY);

        OperationLog log = new OperationLog();

        try {
            String content = getServiceMthodDescription(joinPoint);
            log.setContent(user.getRealName() + content);
            log.setRemarks(getServiceMethodParams(joinPoint));
            log.setUserId(user.getId());
            String operatType = getServiceMthodTableType(joinPoint);
            log.setOperatType(operatType);
            operationLogService.insert(log);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }

    }

    /**
     * 獲取註解中對方法的描述資訊 用於service層註解
     * @param joinPoint 切點
     * @return 方法描述
     * @throws ClassNotFoundException
     */
    private String getServiceMthodDescription(JoinPoint joinPoint) throws ClassNotFoundException {
        String targetName = joinPoint.getTarget().getClass().getName();
        String methodName = joinPoint.getSignature().getName();
        Object[] arguments = joinPoint.getArgs();
        Class targetClass = Class.forName(targetName);
        Method[] methods = targetClass.getMethods();
        String description = "";
        for (Method method : methods) {
            if (method.getName().equals(methodName)) {
                Class[] clazzs = method.getParameterTypes();
                if (clazzs.length == arguments.length) {
                    description = method.getAnnotation(SystemServiceLog.class).description();
                    break;
                }
            }
        }

        return description;
    }

    /**
     * 獲取註解方法中的描述資訊  用於 Service 層註解
     * @param joinPoint 切點
     * @return 方法描述
     * @throws ClassNotFoundException
     */
    private String getServiceMthodTableType(JoinPoint joinPoint) throws ClassNotFoundException {
        String targetName = joinPoint.getTarget().getClass().getName();
        String methodName = joinPoint.getSignature().getName();
        Object[] arguments = joinPoint.getArgs();
        Class targetClass = Class.forName(targetName);
        Method[] methods = targetClass.getMethods();
        String description = "";
        for (Method method : methods) {
            if (method.getName().equals(methodName)) {
                Class[] clazzs = method.getParameterTypes();
                if (clazzs.length == arguments.length) {
                    description = method.getAnnotation(SystemServiceLog.class).description();
                    break;
                }
            }
        }

        return description;
    }

    /**
     * 獲取json格式的引數<br>
     * 
     * @param joinPoint
     * @return
     * @since JDK1.8
     */
    private String getServiceMethodParams(JoinPoint joinPoint) {
        Object[] arguments = joinPoint.getArgs();
        if (arguments == null || arguments.length == 0) {
            return "無引數";
        }
        List<Object> list = new ArrayList<>(Arrays.asList(arguments));
        String params = JsonUtil.getJsonStringFromPOJO(list);
        return params;
    }
}

4. 在service的實現類的方法上使用自定義註解記錄日誌

@Override
    @Transactional
    @SystemServiceLog(description=Constants.CLIENT_SELECT_LIST, tableType=Constants.USER_TABLE_TYPE)
    public Map<String, Object> queryXXX(String name, String address) {
        Map<String, Object> map = new HashMap<>();
        // 省略
        return map;
    }