spring boot使用log4j2将日志写入mysql数据库

log4j2官方例子在spring boot中报错而且还是用的是org.apache.commons.dbcp包

我给改了一下使用org.apache.commons.dbcp2包

1.log4j2.xml如下:

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="error">
    <Appenders>
        <Console name="Console" target="SYSTEM_OUT">
            <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" />
        </Console>
        <JDBC name="DBLogger" tableName="MicroServiceLogHandle">
            <ConnectionFactory class="com.malls.common.tool.LogConnectionFactory"
                method="getDatabaseConnection" />
            <Column name="RequestKey" pattern="${sd:RequestKey}" />
            <Column name="LogType" pattern="${sd:LogType}" />
            <Column name="RequestUrl" pattern="${sd:RequestUrl}" />
            <Column name="UserName" pattern="${sd:UserName}" />
            <Column name="OrderNo" pattern="${sd:OrderNo}" />
            <Column name="Content" pattern="${sd:Content}" />
            <Column name="Keyword" pattern="${sd:Keyword}" />
            <Column name="ClientIP" pattern="${sd:ClientIP}" />
            <Column name="TimeLong" pattern="${sd:TimeLong}" />
            <Column name="LogTime" pattern="${sd:LogTime}" />
            <Column name="DBCreateTime" literal="now()" />
            <Column name="ServerDesc" pattern="${sd:ServerDesc}" />
            <Column name="LogLevel" pattern="${sd:LogLevel}" />
            <Column name="RequestServerIP" pattern="${sd:RequestServerIP}" />
            <Column name="ServerIP" pattern="${sd:ServerIP}" />
            <Column name="CurrentApiRequestKey" pattern="${sd:CurrentApiRequestKey}" />
        </JDBC>
    </Appenders>
    <Loggers>
        <AsyncLogger name="AsyncDBLogger" level="debug"
            includeLocation="true">
            <AppenderRef ref="DBLogger" />
        </AsyncLogger>
        <Root level="info">
            <AppenderRef ref="Console" />
        </Root>
    </Loggers>
</Configuration>

AsyncLogger 表示是异步插入.需要在pom.xml中插入disruptor引用

        <dependency>
            <groupId>com.lmax</groupId>
            <artifactId>disruptor</artifactId><!-- log4j异步插入用到 -->
            <version>3.4.1</version>
        </dependency>

2.创建LogConnectionFactory类:

package com.malls.common.tool;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

import javax.sql.DataSource;

import org.apache.commons.dbcp2.ConnectionFactory;
import org.apache.commons.dbcp2.DriverManagerConnectionFactory;
import org.apache.commons.dbcp2.PoolableConnection;
import org.apache.commons.dbcp2.PoolableConnectionFactory;
import org.apache.commons.dbcp2.PoolingDataSource;
import org.apache.commons.pool2.ObjectPool;
import org.apache.commons.pool2.impl.GenericObjectPool;

import com.malls.common.model.DBConfig;

public class LogConnectionFactory {

    private static interface Singleton {
        final LogConnectionFactory INSTANCE = new LogConnectionFactory();
    }

    private DataSource dataSource;

    private LogConnectionFactory() {

    }

    private void initDataSource() {

        try {
            //
            // First, we'll create a ConnectionFactory that the
            // pool will use to create Connections.
            // We'll use the DriverManagerConnectionFactory,
            // using the connect string passed in the command line
            // arguments.
            DBConfig dbConfig = ApplicationConfig.GetDbConfig("dblog");
            ConnectionFactory connectionFactory = new DriverManagerConnectionFactory(dbConfig.getUrl(),
                    dbConfig.getUserName(), dbConfig.getPassword());

            //
            // Next we'll create the PoolableConnectionFactory, which wraps
            // the "real" Connections created by the ConnectionFactory with
            // the classes that implement the pooling functionality.
            //
            PoolableConnectionFactory poolableConnectionFactory = new PoolableConnectionFactory(connectionFactory,
                    null);

            //
            // Now we'll need a ObjectPool that serves as the
            // actual pool of connections.
            //
            // We'll use a GenericObjectPool instance, although
            // any ObjectPool implementation will suffice.
            //
            ObjectPool<PoolableConnection> connectionPool = new GenericObjectPool<>(poolableConnectionFactory);

            // Set the factory's pool property to the owning pool
            poolableConnectionFactory.setPool(connectionPool);

            //
            // Finally, we create the PoolingDriver itself,
            // passing in the object pool we created.
            //
            dataSource = new PoolingDataSource<>(connectionPool);
        } catch (Exception e) {
            // TODO 自动生成的 catch 块
            e.printStackTrace();
            dataSource = null;
        }

    }

    int i = 0;
    private static Lock lock = new ReentrantLock(); 

    public static Connection getDatabaseConnection() throws SQLException {
        if (Singleton.INSTANCE.i == 0) {
            //这儿如果第一次直接返回连接池的话会报错
            //因为PoolableConnectionFactory也使用了log4j记录日志
            //这儿是重点
            Singleton.INSTANCE.i++;
            DBConfig dbConfig = ApplicationConfig.GetDbConfig("dblog");
            return DriverManager.getConnection(dbConfig.getUrl(), dbConfig.getUserName(), dbConfig.getPassword());
        }
        if (Singleton.INSTANCE.dataSource == null) {
            lock.lock();
            try {
                if (Singleton.INSTANCE.dataSource == null) {
                    Singleton.INSTANCE.initDataSource();
                }
            } finally {
                lock.unlock();
            }
        }
        return Singleton.INSTANCE.dataSource.getConnection();
    }
}

要注意注释的地方,第二次才返回连接池

3.创建DBLog类:

package com.malls.common.tool;

import java.time.Duration;
import java.time.LocalDateTime;
import java.util.UUID;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.message.StructuredDataMessage;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;

import com.malls.common.model.RequestModel;

public class DBLog {
    private static final Logger LOGGER = LogManager.getLogger("AsyncDBLogger");

    public static void process(String logType, String content) {
        process(logType, content, "");
    }

    public static void process(String logType, String content, String keyWord) {
        StructuredDataMessage msg = getataMessage(logType, content, keyWord);
        addMsg(msg, "logLevel", "Process");
        LOGGER.info(msg);
    }

    public static void error(String logType, String content) {
        error(logType, content, "");
    }

    public static void error(String logType, String content, String keyWord) {
        StructuredDataMessage msg = getataMessage(logType, content, keyWord);
        addMsg(msg, "logLevel", "Error");
        LOGGER.error(msg);
    }

    public static void handle(String logType, String content) {
        handle(logType, content, "");
    }

    public static void handle(String logType, String content, String keyWord) {
        StructuredDataMessage msg = getataMessage(logType, content, keyWord);
        addMsg(msg, "LogLevel", "Handle");
        LOGGER.info(msg);
    }

    private static StructuredDataMessage getataMessage(String logType, String content, String keyWord) {
        String confirm = UUID.randomUUID().toString().replace("-", "");
        StructuredDataMessage msg = new StructuredDataMessage(confirm, "", "transfer");
        RequestAttributes req = RequestContextHolder.currentRequestAttributes();
        RequestModel requestModel = null;
        if (req != null) {
            requestModel = (RequestModel) req.getAttribute("RequestModel", RequestAttributes.SCOPE_REQUEST);
        }
        if (requestModel == null) {
            requestModel = new RequestModel();
        }
        addMsg(msg, "RequestKey", requestModel.getRequestKey());
        addMsg(msg, "RequestUrl", requestModel.getRequestUrl());
        addMsg(msg, "UserName", String.valueOf(requestModel.getCurrentUserId()));
        addMsg(msg, "OrderNo", requestModel.getOrderNo());
        addMsg(msg, "LogType", logType);
        addMsg(msg, "Content", content);
        addMsg(msg, "Keyword", keyWord);
        addMsg(msg, "ClientIP", requestModel.getClientIP());
        long timeLong = Duration.between(requestModel.getBeginRequestTime(), LocalDateTime.now()).toMillis();
        addMsg(msg, "TimeLong", String.valueOf(timeLong));
        addMsg(msg, "ServerDesc", "777");
        addMsg(msg, "RequestServerIP", requestModel.getRequestServerIP());
        addMsg(msg, "ServerIP", requestModel.getServerIP());
        addMsg(msg, "CurrentApiRequestKey", requestModel.getCurrentApiRequestKey());
        addMsg(msg, "LogTime", LocalDateTime.now().toString());
        return msg;
    }

    private static void addMsg(StructuredDataMessage msg, String key, String val) {
        if (val == null) {
            msg.put(key, "");
        } else {
            msg.put(key, val);
        }
    }
}

这样就可以了.