如果你使用的是mysql.创建一个log4j.properties文件.这对我有用.

把它放在你的应用程序的根文件夹中.即所有包裹的根.我也有一个包含字段id,日期,用户,消息和类的表日志.

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它.

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 = new ThreadLocal();

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();

}

}