java使用slf4j+log4j进行日志记录并将ERROR级别信息入库

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1.maven 坐标

        <!-- https://mvnrepository.com/artifact/log4j/log4j -->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.15</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/commons-logging/commons-logging -->
        <dependency>
            <groupId>commons-logging</groupId>
            <artifactId>commons-logging</artifactId>
            <version>1.2</version>
        </dependency>

2.log4j.properties文件（这个文件放到资源目录）

log4j.rootLogger = INFO, info, warn, error, console, db

#console level  
log4j.appender.console = org.apache.log4j.ConsoleAppender
log4j.appender.console.Target = System.out
log4j.appender.console.layout = org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern =  %d{yyyy-MM-dd HH:mm:ss} [%c]-[%p] %m%n
# 每日产生文件
log4j.appender.dailyFile=org.apache.log4j.DailyRollingFileAppender

#info level  
log4j.logger.info = info
log4j.appender.info = org.apache.log4j.DailyRollingFileAppender
log4j.appender.info.File = D:\\logs\\info.log
#log4j.appender.warn.File = /opt/logs/info.log
log4j.appender.info.Append = true
log4j.appender.info.Threshold = INFO
log4j.appender.info.layout = org.apache.log4j.PatternLayout
log4j.appender.info.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n
log4j.appender.info.filter.infoFilter = org.apache.log4j.varia.LevelRangeFilter
log4j.appender.info.filter.infoFilter.LevelMin=INFO
log4j.appender.info.filter.infoFilter.LevelMax=INFO

#warn Level
log4j.logger.warn = warn
log4j.appender.warn=org.apache.log4j.DailyRollingFileAppender
log4j.appender.warn.File = D:\\logs\\warn.log
#log4j.appender.warn.File = /opt/logs/warn.log
log4j.appender.warn.Append=true
log4j.appender.warn.Threshold=WARN
log4j.appender.warn.layout=org.apache.log4j.PatternLayout
log4j.appender.warn.layout.ConversionPattern=%-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n
log4j.appender.warn.datePattern='.'yyyy-MM-dd
log4j.appender.warn.filter.warnFilter=org.apache.log4j.varia.LevelRangeFilter
log4j.appender.warn.filter.warnFilter.LevelMin=WARN
log4j.appender.warn.filter.warnFilter.LevelMax=WARN

#error level  
log4j.logger.error = error
log4j.appender.error = org.apache.log4j.DailyRollingFileAppender
log4j.appender.error.File = D:\\logs\\error.log
#log4j.appender.warn.File = /opt/logs/error.log
log4j.appender.error.Append = true
log4j.appender.error.Threshold = ERROR
log4j.appender.error.layout = org.apache.log4j.PatternLayout
log4j.appender.error.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n
log4j.appender.error.datePattern='.'yyyy-MM-dd
log4j.appender.error.filter.errorFilter=org.apache.log4j.varia.LevelRangeFilter
log4j.appender.error.filter.errorFilter.LevelMin=ERROR
log4j.appender.error.filter.errorFilter.LevelMax=ERROR

# 数据库操作
log4j.appender.db=org.apache.log4j.jdbc.JDBCAppender
# error级别错误入库
log4j.appender.db.Threshold=ERROR
# 设置缓冲区，每10条错误入库
#log4j.appender.db.BufferSize=10
log4j.appender.db.URL=
log4j.appender.db.Driver=
log4j.appender.db.user=
log4j.appender.db.password=
log4j.appender.db.sql=
log4j.appender.db.layout=org.apache.log4j.PatternLayout

设置要插入日志信息的格式和内容的SQL解释：

%X{userId}是置取MDC中的key值，

（过滤器中是将用户id和用户姓名放入MDC中，在这里可以用%X{userId}和%X{userName}取出用户的ID和用户姓名；）

'%C'表示日志信息是来自于那个类；

%M表示日志信息来自于那个方法中；

%d{yyyy-MM-dd HH:mm:ss}表示日志信息产生的时间，{yyyy-MM-dd HH:mm:ss}表示一种时间格式，你也可以直接写成%d；

%p表示日志信息的级别（debug info warn error）；

%m表示你写入的日志信息

3.测试

import org.apache.log4j.Logger;

public class log4jTest {
    public static Logger logger1 = Logger.getLogger(log4jTest.class);

    public static void main(String[] args) {
        logger1.info("我是logger1");

    }

}

4.封装LogUtils（个人喜欢，也可以不封装，在每个类中定义）

package com.xxx;

import java.util.HashMap;
import java.util.Map;

import org.apache.log4j.*;

/**
 * @author phubing
 * 
 * 用于记录日志入库等方法
 */
public class LogUtils {
	private static Map<String,Logger> loggerMap = new HashMap<String,Logger>();

    public static void debug(Object message){
        String className = getClassName();
        Logger log = getLogger(className);
        if(log.isDebugEnabled()){
            log.debug(message);
        }
    }
    
    public static void debug(String tag, Object message){
        String className = getClassName();
        Logger log = getLogger(className);
        if(log.isDebugEnabled()){
            log.debug(new StringBuffer().append("【").append(tag).append("】").append(message).toString());
        }
    }

    public static void info(Object message){
        String className = getClassName();
        Logger log = getLogger(className);
        if(log.isInfoEnabled()){
            log.info(message);
        }
    }
    
    public static void info(String tag, Object message){
        String className = getClassName();
        Logger log = getLogger(className);
        if(log.isInfoEnabled()){
            log.info(new StringBuffer().append("【").append(tag).append("】").append(message).toString());
        }
    }
    
    public static void warn(Object message){
        String className = getClassName();
        Logger log = getLogger(className);
        log.warn(message);
    }
    
    public static void warn(String tag, Object message){
        String className = getClassName();
        Logger log = getLogger(className);
        log.warn(new StringBuffer().append("【").append(tag).append("】").append(message).toString());
    }
    
    public static void error(Object message){
        String className = getClassName();
        Logger log = getLogger(className);        
        log.error(message);
    }
    
    public static void error(String tag, Object message){
        String className = getClassName();
        Logger log = getLogger(className);
        log.error(new StringBuffer().append("【").append(tag).append("】").append(message).toString());
    }
    
    /**
     * @author phubing
     * 
     * 获取最开始的调用者所在类
     */
    private static String getClassName(){
        Throwable th = new Throwable();
        StackTraceElement[] stes = th.getStackTrace();
        StackTraceElement ste = stes[2];
        return ste.getClassName();
    }
    /**
     * @author phubing
     * 
     * 根据类名获得logger对象
     */
    private static Logger getLogger(String className){
        Logger log = null;
        if(loggerMap.containsKey(className)){
            log = loggerMap.get(className);
        }else{
            try {
                log = Logger.getLogger(Class.forName(className));
                loggerMap.put(className, log);
            } catch (ClassNotFoundException e) {
                e.printStackTrace();
            }
        }
        return log;
    }
    
    
    public void insertLog() {
    	
    }
    
    
	
}

5.具体类中使用

LogUtils.error("This is error message");

6.在Logj.properties中配置了数据库连接信息，就会自动入库