配置 log4j 属性文件以存储在 mysql 数据库中

Question

我开始使用 log4j 已经有一段时间了；非常酷的日志框架。我已经完成了其他类型的日志记录，例如控制台和文件日志记录。因此，尝试使用带有 mysql 的数据库适配器进行数据库日志记录。因此，我创建了以下名为 log4j.properties 的属性文件 -

# Define the root logger with appender file
log4j.rootLogger = DEBUG, DB

# Define the DB appender
log4j.appender.DB=org.apache.log4j.jdbc.JDBCAppender

# Set JDBC URL
log4j.appender.DB.URL=jdbc:mysql://localhost:3306/test

# Set Database Driver
log4j.appender.DB.driver=com.mysql.jdbc.Driver

# Set database user name and password
log4j.appender.DB.user=root
log4j.appender.DB.password=

# Set the SQL statement to be executed.
log4j.appender.DB.sql=insert into log(date,level,message) values("%d","%p","%m")

# Define the layout for file appender
log4j.appender.DB.layout=org.apache.log4j.PatternLayout

并以下列方式在测试类中使用它 -

 public class DBLoggerTest {
    static Logger logger;

    public DBLoggerTest() {
        //System.setProperty("log4j.configuration", "log4j.properties");
        logger = Logger.getLogger(DBLoggerTest.class.getName());

    }

    public static void main(String[] args) {
        new DBLoggerTest();
        logger.info("This is a test info");
        logger.error("This is an error messsage");
    }
}

但我收到以下错误 -

log4j:WARN No appenders could be found for logger (com.satyam.logger.test.DBLoggerTest).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

请帮忙...？

Answer 1

如果你使用的是 mysql。创建一个文件 log4j.properties。这对我有用。 将其放在应用程序的根文件夹中。即所有包的根。我也有一个表日志，其中包含字段 id、日期、用户、消息和类。

log4j.rootLogger=DEBUG,DB
log4j.appender.DB=org.apache.log4j.jdbc.JDBCAppender
log4j.appender.DB.URL=jdbc:mysql://localhost:3306/test
log4j.appender.DB.user=root
log4j.appender.DB.password=root
log4j.appender.DB.sql=INSERT INTO logs(date, user, message,class) VALUES ('%d{yyyy-MM-dd HH:mm:ss}', '%X{User}','%m','%c')
log4j.appender.DB.layout=org.apache.log4j.PatternLayout
log4j.appender.CA.layout.ConversionPattern=INSERT INTO logs (date, user,message,class) VALUES ('%d{yyyy-MM-dd HH:mm:ss}', '%X{User}','%m','%c')

log4j.category.ke.co=ERROR
log4j.category.ke.co.appender-ref=DB

然后按如下方式使用。

package com.zeddarn;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import org.apache.log4j.Logger;
import org.apache.log4j.MDC;

public class MySQLDatabaseConnector {

static ThreadLocal<Connection> connection = new ThreadLocal<Connection>();
private static Logger logger = Logger.getLogger(MySQLDatabaseConnector.class);

public static Connection getDBConnection() {

    //check if a mysql connection already exits. This is to avoid reconnecting 
   if (connection.get() == null) {
        try {
            //loading the mysql driver. This means you also have to add mysql libary. You can add manually or via maven
            Class.forName("com.mysql.jdbc.Driver");
        } catch (ClassNotFoundException e) {
            //do something to deal with the error of missing mysql driver e.g notification to the user.
             MDC.put("User", "loggeduser");
            logger.error(e.getMessage());
            MDC.getContext().clear();
        }
        try {

            connection.set(DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "root"));

        } catch (SQLException e) {               
            MDC.put("User", "loggeduser");
            logger.error(e.getMessage());
            MDC.getContext().clear();
      }
    }
    return connection.get();
}

public static void main(String args[]) {
      MDC.put("User", "loggeduser");
            logger.error("message from exception.getMessage() method");
            MDC.getContext().clear();
}

}