Aop指面向切面編程双妨，在spring mvc 里已經(jīng)出現(xiàn)，springBoot作為體系之一叮阅，也包含AOP刁品。在一個Web應(yīng)用中，我希望記錄所有請求的遠(yuǎn)端地址浩姥，請求客戶端類型挑随，請求URI等記錄，一方面是為了做安全記錄勒叠，同時也可以提供后期考慮數(shù)據(jù)分析的基礎(chǔ)數(shù)據(jù)兜挨，具體可以通過Headers信息獲取。常見的比較重要的頭信息包括 user-agent, accept等眯分，其他如URI拌汇，queryString 等在serveletRequest中得到桑涎。如果單獨考慮每個方法里附加方法棵红，太過笨拙，AOP的特性提供了很好的方案壕探∑可以按照包与倡，類，方法昆稿，注解各個級別作為切點纺座，攔截訪問請求，做附加處理溉潭。當(dāng)然比驻，現(xiàn)實中各種項目也是通過AOP實現(xiàn)類似的功能该溯，包括訪問日志記錄，驗證頭信息别惦，數(shù)據(jù)庫SQL分析統(tǒng)計狈茉，redis請求統(tǒng)計等。

看個圖放松

基本功能已經(jīng)完成掸掸，中間有遇到AOP不生效的情況氯庆，查找相關(guān)資料，有建議添加配置項spring.aop.auto=true , spring.aop.proxy-target-class=true扰付，后者是使用CGLIB代理堤撵，可能有性能下降。其實都不需要這些配置羽莺，默認(rèn)是生效的实昨，后面解釋原因；還有建議添加@EnableProxyTargetClass盐固，原因也類似荒给；以及建議添加@ComponentScan覆蓋AOP目錄。以上可能是在某些情況下的適用方案刁卜。這次遇到的問題其實是切入條件不正確志电，在相關(guān)例子中缺少了public前綴，導(dǎo)致的不生效蛔趴。正確是：@Pointcut("execution (public * com.igoso.me.gallery.controller.*.*(..))")挑辆。
另外有個缺陷是，為查詢記錄孝情，添加了查詢的HTTP請求鱼蝉，本身也會被記錄其中，后續(xù)再考慮在入庫之前進(jìn)行過濾箫荡，目前沒有影響蚀乔。

補充：多個Aop可以使用@Order(n)，來控制順序菲茬。

如下是整個Aspect的代碼：

/**
 * created by igoso at 2018/5/26
 **/
@Aspect
@Component
public class HttpLogAspect {
    private static final Logger LOGGER = LoggerFactory.getLogger("HTTP_LOG");

    @Resource
    private HeaderDetailDao headerDetailDao;

    @Pointcut("execution (public * com.igoso.me.gallery.controller.*.*(..))")
    public void log() {

    }

    @Before("log()")
    public void doBefore(JoinPoint joinPoint) {
        ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
        if (null == attributes) {
            LOGGER.error("get servlet request attributes null");
            return;
        }
        HttpServletRequest request = attributes.getRequest();

        Map<String,String> headers = new HashMap<>();
        String name;
        request.getAttributeNames();
        for (Enumeration e = request.getHeaderNames(); e.hasMoreElements();) {
            name = e.nextElement().toString();
            headers.put(name, request.getHeader(name));
        }

        headers.put("uri", request.getRequestURI());
        headers.put("queryString", request.getQueryString());
        headers.put("remoteAddr", request.getRemoteAddr());
        headers.put("method", request.getMethod());
        headers.put("remoteHost",request.getRemoteHost());
        headers.put("remotePort",String.valueOf(request.getRemotePort()));
        headers.put("protocol",request.getProtocol());

        HeaderDetail headerDetail = new HeaderDetail(headers, JSON.toJSONString(headers));
        LOGGER.debug(JSON.toJSONString(headers,true));

        try {
            headerDetailDao.insert(headerDetail);
        } catch (Exception e) {
            LOGGER.error("insert header detail error:{}",e);
        }

    }

}


/**
 * created by igoso at 2018/5/26
 **/

@Getter
@Setter
@NoArgsConstructor
public class HeaderDetail extends Entity{

    private String acceptLanguage;
    private String method;
    private String remoteHost;
    private String remotePort;
    private String remoteAddr;
    private String queryString;
    private String uri;
    private String accept;
    private String localHost;
    private String acceptEncoding;
    private String userAgent;
    private String protocol;
    private String extensions;//json

    public HeaderDetail(Map<String,String> origin, String extensions) {
        this.acceptLanguage = origin.get(HeaderAttributes.ACCEPT_LANGUAGE);
        this.method = origin.get(HeaderAttributes.METHOD);
        this.remoteAddr = origin.get(HeaderAttributes.REMOTE_ADDR);
        this.remoteHost = origin.get(HeaderAttributes.REMOTE_HOST);
        this.remotePort = origin.get(HeaderAttributes.REMOTE_PORT);
        this.queryString = origin.get(HeaderAttributes.QUERY_STRING);
        this.uri = origin.get(HeaderAttributes.URI);
        this.accept = origin.get(HeaderAttributes.ACCEPT);
        this.localHost = origin.get(HeaderAttributes.LOCAL_HOST);
        this.acceptEncoding = origin.get(HeaderAttributes.ACCEPT_ENCODING);
        this.userAgent = origin.get(HeaderAttributes.USER_AGENT);
        this.protocol = origin.get(HeaderAttributes.PROTOCOL);

        this.extensions = extensions; //other
    }

    private class HeaderAttributes{
        static final String ACCEPT_LANGUAGE = "accept-language";
        static final String METHOD = "method";
        static final String REMOTE_ADDR = "remoteAddr";
        static final String REMOTE_HOST = "remoteHost";
        static final String REMOTE_PORT = "remotePort";
        static final String QUERY_STRING = "queryString";
        static final String URI = "uri";
        static final String ACCEPT = "accept";
        static final String LOCAL_HOST = "host";
        static final String ACCEPT_ENCODING = "accept-encoding";
        static final String USER_AGENT = "user-agent";
        static final String PROTOCOL = "protocol";
    }
}