commons-logging提供了通用得接口和各种log得实现接合,我原来使用得log4j,所以就想 把log4j得代码改成commons-logging,找了一篇文章就照着做,把我原来得一个类改了下: public class JdbcMap extends BaseMap { /** * All logging goes through this logger */ private static Log log = LogFactory.getLog(JdbcMap.class); private Statement sta = null; /** * 通过session获得connection * @return 当前session得connection */ public Connection getConnection() throws HibernateException{ return getSession().connection(); } public Statement getStatement() throws HibernateException, SQLException{ if (sta == null){ sta = getSession().connection().createStatement(); } return sta; } public void closeStatement() throws SQLException{ if (sta != null){ sta.close(); sta = null; } } /** * 执行查询 * * @param sql 查询sql * @return * @throws HibernateException if can't get connection from session * @throws SQLException if can't executequery from connection */ public ResultSet executeQuery(String sql) throws HibernateException, SQLException{ if (log.isDebugEnabled()) { log.debug("debug execute query: " + sql); } if (log.isInfoEnabled()) { log.info("info execute query: " + sql); } Statement sta = getStatement(); ResultSet res = sta.executeQuery(sql); return res; } public static void main(String[] args) { if (log.isDebugEnabled()) { log.debug("debug execute query: " ); } if (log.isInfoEnabled()) { log.info("info execute query: " ); } } } 我在web-inf/classses目录下建了commons-logging.properties和log4j.properties,我建了两个appender, commons-logging.properties内容: org.apache.commons.logging.Log=org.apache.commons.logging.impl.Log4JLogger log4j.properties内容: log4j.rootLogger=debug, dest1,dest2 log4j.appender.dest1=org.apache.log4j.ConsoleAppender log4j.appender.dest1.layout=org.apache.log4j.PatternLayout log4j.appender.dest1.layout.ConversionPattern=%d %-5p %-5c{3} %x -> %m%n log4j.appender.dest2=org.apache.log4j.RollingFileAppender log4j.appender.dest2.File=c://bridge.log log4j.appender.dest2.MaxFileSize=100KB # Keep one backup file log4j.appender.dest2.MaxBackupIndex=3 log4j.appender.dest2.layout=org.apache.log4j.PatternLayout log4j.appender.dest2.layout.ConversionPattern=%d [%t] %-5p %-5c{3}(%L) %x -> %m%n 并把commons-logging.jar和log4j.jar都拷贝到了web-inf/lib目录下,所有准备工作都做完了,然后 我建立了一个servlet,调用了 jdbcmap map= new jdbcmap(); map.executeQuery(sql); 但是运行servlet后,只在控制台打出了这一句log.info("info execute query: " + sql); c://bridge.log 这个文件没有建立,所以得出结论commons-logging没有调用log4j,而是调用得jdklog(commons-logging默认先 找log4j,找不到就用jdk1.4log,要不然就simplelog),于是我就直接运行JdbcMap(见main函数),结果得到了我 想要得结果,c://bridge.log建立了,里面得内容和控制台打出得一样,log.debug("debug execute query: " ) 这一句也打了出来. 终于说完了,有点罗嗦,大家帮我看看,最好试一试,有知道得就告诉我, 我怀疑是不是classloader得问题. 
|