Log4j2 JDBCAppender的使用

一.缘由

最近打算重新整理一下项目的日志系统,将系统日志和业务日志区分开,然后采用文件或是数据库来存储日志,于是上网查了一下log4j的相关配置,并将系统日志写入了数据库,但是发生了一个bug:

当写入的信息里存在单引号时,数据库就会报错

ORA-00917: 缺失逗号

查了一些资料,发现log4j已经很古老了,它对SQL基本没有做任何处理就执行存储操作,这样SQL里可能存在的一些特殊字符并没有经过处理导致上面的错误.找了好久都没有找到解决办法,所以痛定思痛告别log4j而使用log4j2

二.使用

基本的使用就不累述了,这里有Apache Log4j2官方文档,给firebug装个有道翻译插件,或者直接阅读也没什么难度,这篇博客主要讲述如何配置JDBCAppender(其实文档里也有)

1.

web.xml

配置

注意,

log4j2.xml

这个名字是默认的,放在

resource

目录下的,如果你是采用默认的,那么

web.xml

里就不需要配置.

如果需要自定义路径记得在

web.xml

里如下配置

<context-param>
<param-name>log4j2ConfigLocation</param-name>
<param-value>classpath:config/log4j2.xml</param-value>
</context-param>

2.log4j2.xml的配置

这里仅仅配置了两个输出方式,

Console

和

JDBC

也就是控制台和数据库,其中

com.amayadream.webchat.listener.PoolManager

是一个连接池管理类,

getConnection

方法是获取

Connection

对象,代码会在下面贴出.

数据库名为

syslog

,一共六个字段分别为

id

,

class

,

function

,

message

,

leavl

,

time

,类型都是

varchar2

,

id

为主键,默认值为

sys_guid()

配置中:

tableName

是数据库中日志表的表名,

Column

是数据库的字段,

pattern

是字段的值,因为我用的是

oracle

数据库,

id

用的是

sys_guid()

,所以在这里省略以实现不重复的主键效果.

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="INFO" monitorInterval="1800">
<appenders>
<Console name="consolePrint" target="SYSTEM_OUT">
<PatternLayout pattern="%d{HH:mm:ss} [%t] %-5level %logger{36} - %msg%n" />
</Console>
<JDBC name="databaseAppender" tableName="SYSLOG">
<ConnectionFactory class="com.amayadream.webchat.listener.PoolManager" method="getConnection" />
<!--<Column name="ID" pattern=""/>-->
<Column name="CLASS" pattern="%C" />
<Column name="FUNCTION" pattern="%M" />
<Column name="MESSAGE" pattern="%m" />
<Column name="LEAVL" pattern="%level" />
<Column name="TIME" pattern="%d{yyyy-MM-dd HH:mm:ss.SSS}" />
</JDBC>
</appenders>

<loggers>
<root level="info">
<appender-ref ref="consolePrint" />
<AppenderRef ref="databaseAppender" level="INFO" />
</root>
</loggers>
</Configuration>

3.Connection获取

PoolManager.java

package com.amayadream.webchat.listener;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.sql.*;
import java.util.Properties;

import org.apache.commons.dbcp.ConnectionFactory;
import org.apache.commons.dbcp.DriverManagerConnectionFactory;
import org.apache.commons.dbcp.PoolableConnectionFactory;
import org.apache.commons.dbcp.PoolingDriver;
import org.apache.commons.pool.ObjectPool;
import org.apache.commons.pool.impl.GenericObjectPool;
import org.junit.Test;

/**
* @author :  Amayadream
* @date :  2016.04.06 20:17
*/
public class PoolManager {
private static String driver = "oracle.jdbc.driver.OracleDriver";
private static String url = "jdbc:oracle:thin:@localhost:1521:XE";
private static String Name = "amayadream";
private static String Password = "123456";

private static Class driverClass = null;
private static ObjectPool connectionPool = null;

public PoolManager() {

}

/**
* 装配配置文件
*/
private static void loadProperties(){
try {
InputStream stream = PoolManager.class.getClassLoader().getResourceAsStream("jdbc.properties");
Properties props = new Properties();
props.load(stream);
driver = props.getProperty("driver");
url = props.getProperty("url");
Name = props.getProperty("username");
Password = props.getProperty("password");
} catch (FileNotFoundException e) {
System.out.println("读取配置文件异常");
} catch(IOException ie){
System.out.println("读取配置文件时IO异常");
}
}

/**
* 初始化数据源
*/
private static synchronized void initDataSource(){
if (driverClass == null) {
try{
driverClass = Class.forName(driver);
}catch (ClassNotFoundException e){
e.printStackTrace();
}
}
}

/**
* 连接池启动
*/
public static void startPool(){
loadProperties();
initDataSource();
if (connectionPool != null) {
destroyPool();
}
try {
connectionPool = new GenericObjectPool(null);
ConnectionFactory connectionFactory = new DriverManagerConnectionFactory(url, Name, Password);
PoolableConnectionFactory poolableConnectionFactory = new PoolableConnectionFactory(connectionFactory, connectionPool, null, null, false, true);
Class.forName("org.apache.commons.dbcp.PoolingDriver");
PoolingDriver driver = (PoolingDriver) DriverManager.getDriver("jdbc:apache:commons:dbcp:");
driver.registerPool("dbpool", connectionPool);
System.out.println("装配连接池OK");
} catch (Exception e) {
e.printStackTrace();
}
}

public static void destroyPool(){
try {
PoolingDriver driver = (PoolingDriver) DriverManager.getDriver("jdbc:apache:commons:dbcp:");
driver.closePool("dbpool");
} catch (SQLException e) {
e.printStackTrace();
}
}

/**
* 取得连接池中的连接
* @return
*/
public static Connection getConnection() {
Connection conn = null;
if(connectionPool == null)
startPool();
try {
conn = DriverManager.getConnection("jdbc:apache:commons:dbcp:dbpool");
} catch (SQLException e) {
e.printStackTrace();
}
return conn;
}

/**
* 获取连接
* getConnection
* @param name
* @return
*/
public static Connection getConnection(String name){
return getConnection();
}

/**
* 释放连接
* freeConnection
* @param conn
*/
public static void freeConnection(Connection conn){
if(conn != null){
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}

/**
* 释放连接
* freeConnection
* @param name
* @param con
*/
public static void freeConnection (String name,Connection con){
freeConnection(con);
}

@Test
public void test(){
try {
Connection conn = PoolManager.getConnection();
if(conn != null){
Statement statement = conn.createStatement();
ResultSet rs = statement.executeQuery("select * from syslog");
int c = rs.getMetaData().getColumnCount();
while(rs.next()){
System.out.println();
for(int i=1;i<=c;i++){
System.out.print(rs.getObject(i));
}
}
rs.close();
}
PoolManager.freeConnection(conn);
} catch (SQLException e) {
e.printStackTrace();
}
}
}

4.jdbc.properties

这里没什么要说的,主要是

PoolManager

中

getProperties()

中的key要和这里对应

driver=oracle.jdbc.driver.OracleDriver
url=jdbc:oracle:thin:@localhost:1521:XE
username=amayadream
password=123456
#定义初始连接数
initialSize=0
#定义最大连接数
maxActive=20
#定义最大空闲
maxIdle=20
#定义最小空闲
minIdle=1
#定义最长等待时间
maxWait=60000

三.Building…