log4j利用数据库连接池（dbcp）

最近写程序有个问题郁闷了好久，开始写的时候很多操作频繁的对数据库进行增删改查操作，有些操作中就出现了效率低下的问题。研究之后将所有对数据库的连接方式改用了数据库连接池（dbcp）的方式，果然各个操作的效率提高了很多，不过出现了一个问题，我的日志部分是利用log4j来实现的，在我对数据库操作中与一个功能是对数据库的备份和恢复，由于恢复数据库的功能的要kill掉进程再恢复，我发现dbcp是有自动重连机制的，所以恢复数据库后其他操作都正常，但是日志不再写入数据库，纠结了很久发现是log4j的配置，之前log4j是自己连数据库，在kill之后他没有重连，所以无法写入数据库，那么我就改了配置，让log4j也利用数据库连接池，问题就解决了。

之前的配置：

log4j.rootLogger = debug,stdout,D,E,db

### \u8F93\u51FA\u4FE1\u606F\u5230\u63A7\u5236\u62AC ###
log4j.appender.stdout = org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target = System.out
log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern = [%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n

### \u8F93\u51FADEBUG \u7EA7\u522B\u4EE5\u4E0A\u7684\u65E5\u5FD7\u5230=E://logs/error.log ###
log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
log4j.appender.D.DatePattern='.'yyyy-MM-dd
log4j.appender.D.File = logs/log.log
log4j.appender.D.Append = true
log4j.appender.D.Threshold = DEBUG 
log4j.appender.D.layout = org.apache.log4j.PatternLayout
log4j.appender.D.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n

### \u8F93\u51FAERROR \u7EA7\u522B\u4EE5\u4E0A\u7684\u65E5\u5FD7\u5230=E://logs/error.log ###
log4j.appender.E = org.apache.log4j.DailyRollingFileAppender
log4j.appender.D.DatePattern='.'yyyy-MM-dd
log4j.appender.E.File =logs/error.log 
log4j.appender.E.Append = true
log4j.appender.E.Threshold = ERROR 
log4j.appender.E.layout = org.apache.log4j.PatternLayout
log4j.appender.E.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n
 ###JDBCAppender
 log4j.appender.db = org.apache.log4j.jdbc.JDBCAppender
 log4j.appender.db.BufferSize=1
 log4j.appender.db.driver=com.microsoft.sqlserver.jdbc.SQLServerDriver
 log4j.appender.db.user=sa
 log4j.appender.db.password=123456
 log4j.appender.db.URL=jdbc:sqlserver://localhost:1433;DatabaseName=RMS_Station
 
 log4j.appender.db.sql=insert into T_ResLog (LogName,UserName,Class,Mothod,createTime,LogLevel,MSG) values ('%X{userId}','%X{userName}','%C','%M','%d{yyyy-MM-dd HH:mm:ss}','%p','%m')  
 log4j.appender.db.layout=org.apache.log4j.PatternLayout 

改之后：

## \u8BBE\u7F6E###
log4j.rootLogger = debug,stdout,D,E,db

### \u8F93\u51FA\u4FE1\u606F\u5230\u63A7\u5236\u62AC ###
log4j.appender.stdout = org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target = System.out
log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern = [%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n

### \u8F93\u51FADEBUG \u7EA7\u522B\u4EE5\u4E0A\u7684\u65E5\u5FD7\u5230=E://logs/error.log ###
log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
log4j.appender.D.DatePattern='.'yyyy-MM-dd
log4j.appender.D.File = logs/log.log
log4j.appender.D.Append = true
log4j.appender.D.Threshold = DEBUG 
log4j.appender.D.layout = org.apache.log4j.PatternLayout
log4j.appender.D.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n

### \u8F93\u51FAERROR \u7EA7\u522B\u4EE5\u4E0A\u7684\u65E5\u5FD7\u5230=E://logs/error.log ###
log4j.appender.E = org.apache.log4j.DailyRollingFileAppender
log4j.appender.D.DatePattern='.'yyyy-MM-dd
log4j.appender.E.File =logs/error.log 
log4j.appender.E.Append = true
log4j.appender.E.Threshold = ERROR 
log4j.appender.E.layout = org.apache.log4j.PatternLayout
log4j.appender.E.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n
 ###JDBCAppender
# log4j.appender.db = org.apache.log4j.jdbc.JDBCAppender
# log4j.appender.db.BufferSize=1
# log4j.appender.db.driver=com.microsoft.sqlserver.jdbc.SQLServerDriver
# log4j.appender.db.user=sa
# log4j.appender.db.password=123456
# log4j.appender.db.URL=jdbc:sqlserver://localhost:1433;DatabaseName=RMS_Station
 
# log4j.appender.db.sql=insert into T_ResLog (LogName,UserName,Class,Mothod,createTime,LogLevel,MSG) values ('%X{userId}','%X{userName}','%C','%M','%d{yyyy-MM-dd HH:mm:ss}','%p','%m')  
# log4j.appender.db.layout=org.apache.log4j.PatternLayout
log4j.appender.db.sql=insert into T_ResLog (LogName,UserName,Class,Mothod,createTime,LogLevel,MSG) values ('%X{userId}','%X{userName}','%C','%M','%d{yyyy-MM-dd HH:mm:ss}','%p','%m')  
log4j.appender.db=com.sm.tools.JDBCPoolAppender
log4j.appender.db.layout=org.apache.log4j.PatternLayout

重写

/**
 * 重写log4j的数据库连接池（DBCP）连接
 */

package com.sm.tools;

import java.sql.Connection;
import java.sql.SQLException;

import org.apache.log4j.spi.ErrorCode;

import com.sm.db.DBManager;

public class JDBCPoolAppender extends org.apache.log4j.jdbc.JDBCAppender {
	/**数据库连接对象*/ 


	protected Connection connection;  


	public JDBCPoolAppender() {  
	super();  
	}  


	@Override 
	protected void closeConnection(Connection con) {  
	try {  
	if (connection != null && !connection.isClosed())  
	connection.close();  
	} catch (SQLException e) {  
	errorHandler.error("Error closing connection", e, ErrorCode.GENERIC_FAILURE);  
	}  
	}  


	@Override 
	protected Connection getConnection() throws SQLException {  
	try {
	//connection=JdbcUtils.getConnection();
		connection=DBManager.getConn();
		System.out.println("log4j连接标记");
	} catch (Exception e) {  
	System.out.println(e.getMessage());  
	}  
	return connection;  
	}  
}