Spring Boot log4j实现把日志存入mongodb

准备工作

　　１．自定义appender的实现

　　log4j提供的输出器实现自Appender接口，要自定义appender输出到MongoDB，只需要继承AppenderSkeleton类，并实现几个方法即可完成。

　　在pom.xml中引入下面依赖:

<dependency>
    <groupId>org.mongodb</groupId>
    <artifactId>mongodb-driver</artifactId>
    <version>3.2.</version>
</dependency>

　　实现MongoAppender

/**
 * 自定义appender
 */
public class MongoAppender extends AppenderSkeleton{

    private MongoClient mongoClient;
    private MongoDatabase mongoDatabase;
    private MongoCollection<BasicDBObject> logsCollection;

    /**
     * mongodb链接url
     */
    private String connectionUrl;

    /**
     * 记录日志的数据库
     */
    private String databaseName;

    /**
     * 记录日志的集合
     */
    private String collectionName;

    /**
     * 根据log4j.properties中的配置创建mongodb连接
     * LoggingEvent提供getMessage()函数来获取日志消息
     * 往配置的记录日志的collection中插入日志消息
     * @param loggingEvent
     */
    @Override
    protected void append(LoggingEvent loggingEvent) {
        if(mongoDatabase == null){
            MongoClientURI connectionString = new MongoClientURI(connectionUrl);
            mongoClient = new MongoClient(connectionString);
            mongoDatabase = mongoClient.getDatabase(databaseName);
            logsCollection = mongoDatabase.getCollection(collectionName, BasicDBObject.class);
        }
        logsCollection.insertOne((BasicDBObject) loggingEvent.getMessage());
    }

    @Override
    public void close() {
        if(mongoClient != null){
            mongoClient.close();
        }
    }

    @Override
    public boolean requiresLayout() {
        return false;
    }
}

　　配置log4j.properties

log4j.logger.mongodb=INFO, mongodb
# mongodb输出
log4j.appender.mongodb=com.ysl.appender.MongoAppender
log4j.appender.mongodb.connectionUrl=mongodb://localhost:27017
log4j.appender.mongodb.databaseName=logs
log4j.appender.mongodb.collectionName=logs_request

　　使用mongodb logger

• logger取名为mongodb的
• 通过getBasicDBObject函数从HttpServletRequest和JoinPoint对象中获取请求信息，并组装成BasicDBObject
  • getHeadersInfo函数从HttpServletRequest中获取header信息
• 通过logger.info()，输出BasicDBObject对象的信息到mongodb

@Aspect
@Order()
@Component
public class WebLogAspect {

    private Logger logger = Logger.getLogger("mongodb");

    @Pointcut("execution(public * com.didispace.web..*.*(..))")
    public void webLog(){}

    @Before("webLog()")
    public void doBefore(JoinPoint joinPoint) throws Throwable {
        // 获取HttpServletRequest
        ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
        HttpServletRequest request = attributes.getRequest();
        // 获取要记录的日志内容
        BasicDBObject logInfo = getBasicDBObject(request, joinPoint);
        logger.info(logInfo);
    }

    private BasicDBObject getBasicDBObject(HttpServletRequest request, JoinPoint joinPoint) {
        // 基本信息
        BasicDBObject r = new BasicDBObject();
        r.append("requestURL", request.getRequestURL().toString());
        r.append("requestURI", request.getRequestURI());
        r.append("queryString", request.getQueryString());
        r.append("remoteAddr", request.getRemoteAddr());
        r.append("remoteHost", request.getRemoteHost());
        r.append("remotePort", request.getRemotePort());
        r.append("localAddr", request.getLocalAddr());
        r.append("localName", request.getLocalName());
        r.append("method", request.getMethod());
        r.append("headers", getHeadersInfo(request));
        r.append("parameters", request.getParameterMap());
        r.append("classMethod", joinPoint.getSignature().getDeclaringTypeName() + "." + joinPoint.getSignature().getName());
        r.append("args", Arrays.toString(joinPoint.getArgs()));
        return r;
    }

    private Map<String, String> getHeadersInfo(HttpServletRequest request) {
        Map<String, String> map = new HashMap<>();
        Enumeration headerNames = request.getHeaderNames();
        while (headerNames.hasMoreElements()) {
            String key = (String) headerNames.nextElement();
            String value = request.getHeader(key);
            map.put(key, value);
        }
        return map;
    }

}