mybatis的日志級別可以在源碼中找到：trace，debug，warn，error，當mybatis想使用jdk的log實現類時，需要一個適配器進行轉化，因為log在jdk中實現的級別比mybatis多，適配器的類為Jdk14LoggingImpl

/** Copyright ${license.git.copyrightYears} the original author or authors.** Licensed under the Apache License, Version 2.0 (the "License");* you may not use this file except in compliance with the License.* You may obtain a copy of the License at** http://www.apache.org/licenses/LICENSE-2.0** Unless required by applicable law or agreed to in writing, software* distributed under the License is distributed on an "AS IS" BASIS,* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.* See the License for the specific language governing permissions and* limitations under the License.*/ package org.apache.ibatis.logging.jdk14;import java.util.logging.Level; import java.util.logging.Logger;import org.apache.ibatis.logging.Log;/*** @author Clinton Begin*/ //jdk log的適配器 public class Jdk14LoggingImpl implements Log {//真正提供日志能力的jdk日志類private final Logger log;public Jdk14LoggingImpl(String clazz) {log = Logger.getLogger(clazz);}@Overridepublic boolean isDebugEnabled() {return log.isLoggable(Level.FINE);}@Overridepublic boolean isTraceEnabled() {return log.isLoggable(Level.FINER);}@Overridepublic void error(String s, Throwable e) {log.log(Level.SEVERE, s, e);}@Overridepublic void error(String s) {log.log(Level.SEVERE, s);}@Overridepublic void debug(String s) {log.log(Level.FINE, s);}@Overridepublic void trace(String s) {log.log(Level.FINER, s);}@Overridepublic void warn(String s) {log.log(Level.WARNING, s);}}

可以看見完美的將jdk的log實現轉為mybatis的log實現

總結

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