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.  
 
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