Log4j记录日志到数据库

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1.自定义输出消息

/**
 * 参数化消息
 * @author Johnson.Lee
 *
 */
public interface ParameterizedMessage extends Serializable {

	/**
	 * 获取参数列表
	 * @return 返回参数列表
	 */
	public Object[] getParameters();
	
	/**
	 * 获取指定索引位置的参数
	 * @param index 索引位置
	 * @return 返回参数列表中指定索引位置的参数值
	 * @throws IndexOutOfBoundsException 当index >= 参数列表个数时，抛出此异常
	 * @see #getParameterCount()
	 */
	public Object getParameter(int index) throws IndexOutOfBoundsException;
	
	/**
	 * 获取参数个数
	 * @return 返回参数个数
	 */
	public int getParameterCount();
	
}

/**
 * JDBC日志消息
 * @author Johnson.Lee
 *
 */
public class JDBCLogMessage implements ParameterizedMessage {
	private static final long serialVersionUID = 1709063421963292637L;
	private Object[] params;
	
	public JDBCLogMessage(Object... params) {
		this.params = params;
	}

	public Object[] getParameters() {
		return this.params;
	}

	public Object getParameter(int index) throws IndexOutOfBoundsException {
		return this.params[index];
	}

	public int getParameterCount() {
		return this.params.length;
	}

	@Override
	public String toString() {
		return Arrays.toString(this.params);
	}
}

2.继承Log4j的AppenderSkeleton

/**
 * 使用纯JDBC连接将日志记录到数据库中
 * @author Johnson.Lee
 *
 */
public class JDBCAppender extends AppenderSkeleton {
	private String driver;
	private String url;
	private String userName;
	private String password;
	private String sql;

	@Override
	protected void append(LoggingEvent e) {
		Connection conn = null;
		PreparedStatement pstmt = null;
		try {
			Class.forName(this.driver);
			conn = DriverManager.getConnection(this.url, this.userName, this.password);
			if (e.getMessage() instanceof ParameterizedMessage) {
				try {
					pstmt = conn.prepareStatement(sql);
					Object[] params = ((ParameterizedMessage) e.getMessage()).getParameters();
					for (int i = 0; i < params.length; i++) {
						pstmt.setObject(i + 1, params[i]);
					}
					pstmt.executeUpdate();
				} catch (SQLException ex) {
					this.errorHandler.error("log into database failed!", ex, 0);
				} finally {
					AbstractJDBCDao.close(pstmt);
					AbstractJDBCDao.close(conn);
				}
			}
		} catch (ClassNotFoundException ex) {
			this.errorHandler.error("load jdbc driver [" + this.driver + "] failed!", ex, 0);
		} catch (SQLException ex) {
			this.errorHandler.error("establish connect failed!", ex, 0);
		}
	}
	
	@Override
	public void close() {
	}

	@Override
	public boolean requiresLayout() {
		return false;
	}

	/**
	 * 设置JDBC驱动
	 * @param driver JDBC驱动类名
	 */
	public void setDriver(String driver) {
		this.driver = driver;
	}

	/**
	 * 设置连接字符串
	 * @param url 数据库连接字符串
	 */
	public void setUrl(String url) {
		this.url = url;
	}

	/**
	 * 设置数据库用户名
	 * @param userName 用户名
	 */
	public void setUserName(String userName) {
		this.userName = userName;
	}

	/**
	 * 设置数据库密码
	 * @param password 密码
	 */
	public void setPassword(String password) {
		this.password = password;
	}

	/**
	 * 设置插入日志的SQL语句
	 * @param sql
	 */
	public void setSql(String sql) {
		this.sql = sql;
	}
	
}

3.配置log4j.properties

log4j.rootLogger=INFO, stdout, jdbc

#std appender
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d %p [%c] - %m%n

#file appender
#log4j.appender.file=org.apache.log4j.DailyRollingFileAppender
#log4j.appender.file.File=${application.context}
#log4j.appender.file.DatePattern='_'yyyyMMdd'.log'
#log4j.appender.file.layout=org.apache.log4j.PatternLayout
#log4j.appender.file.layout.ConversionPattern=%d %p [%c] - %m%n

#jdbc appender
log4j.appender.jdbc=net.kinginfo.framework.log.JDBCAppender
log4j.appender.jdbc.driver=com.microsoft.jdbc.sqlserver.SQLServerDriver
log4j.appender.jdbc.url=jdbc:microsoft:sqlserver://192.172.10.106:1433;databaseName=tempdb
log4j.appender.jdbc.userName=sa
log4j.appender.jdbc.password=sa
log4j.appender.jdbc.sql=insert into LogInfo(time, type, info) values(getDate(),?,?)

4.创建日志表

use tempdb;

create table LogInfo (
	id int identity(1,1) primary key not null,
	time datetime,
	type int,
	info varchar(255)
);

select * from LogInfo;

5.编写测试类

public class TestJDBCAppender {
	
	public static void main(String[] args) {
		Logger logger = Logger.getRootLogger();
		ParameterizedMessage msg = new JDBCLogMessage(1, "日志测试");
		logger.info(msg);
	}
}

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评论

2 楼 johnson.lee 2009-12-05  

sunrie 写道

能不能做到异步的记录到数据库呢？

1楼所指的异步是指多线程并发的记录日志到数据库中吧？异步记录应该是没问题的，像对HTTP请求做处理时，就有并发的情况，用log4j记录日志是没问题的。

1 楼 sunrie 2009-12-01  

能不能做到异步的记录到数据库呢？