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);}@Testpublic 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…