Aop指面向切面编程，在spring mvc 里已经出现，springBoot作为体系之一，也包含AOP。在一个Web应用中，我希望记录所有请求的远端地址，请求客户端类型，请求URI等记录，一方面是为了做安全记录，同时也可以提供后期考虑数据分析的基础数据，具体可以通过Headers信息获取。常见的比较重要的头信息包括 user-agent, accept等，其他如URI，queryString 等在serveletRequest中得到。如果单独考虑每个方法里附加方法，太过笨拙，AOP的特性提供了很好的方案。可以按照包，类，方法，注解各个级别作为切点，拦截访问请求，做附加处理。当然，现实中各种项目也是通过AOP实现类似的功能，包括访问日志记录，验证头信息，数据库SQL分析统计，redis请求统计等。
看个图放松
基本功能已经完成，中间有遇到AOP不生效的情况，查找相关资料，有建议添加配置项spring.aop.auto=true , spring.aop.proxy-target-class=true，后者是使用CGLIB代理，可能有性能下降。其实都不需要这些配置，默认是生效的，后面解释原因；还有建议添加@EnableProxyTargetClass，原因也类似；以及建议添加@ComponentScan覆盖AOP目录。以上可能是在某些情况下的适用方案。这次遇到的问题其实是切入条件不正确，在相关例子中缺少了public前缀，导致的不生效。正确是：@Pointcut("execution (public * com.igoso.me.gallery.controller.*.*(..))")。
另外有个缺陷是，为查询记录，添加了查询的HTTP请求，本身也会被记录其中，后续再考虑在入库之前进行过滤，目前没有影响。
补充：多个Aop可以使用
@Order(n)，来控制顺序。
如下是整个Aspect的代码：
/**
* 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";
}
}
