Tomcat日志之所以出现中文乱码问题是因为日志输出的编码格式没有设置成UTF-8格式。
首先打开Tomcat目录下的apache-tomcat-6.0.53conflogging.properties文件，
我的日志配置文件如下：
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You 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.
handlers = 1catalina.org.apache.juli.FileHandler, 2localhost.org.apache.juli.FileHandler, 3manager.org.apache.juli.FileHandler, 4host-manager.org.apache.juli.FileHandler, java.util.logging.ConsoleHandler
.handlers = 1catalina.org.apache.juli.FileHandler, java.util.logging.ConsoleHandler
############################################################
# Handler specific properties.
# Describes specific configuration info for Handlers.
############################################################
1catalina.org.apache.juli.FileHandler.level = FINE
1catalina.org.apache.juli.FileHandler.directory = ${catalina.base}/logs
1catalina.org.apache.juli.FileHandler.prefix = catalina
1catalina.org.apache.juli.AsyncFileHandler.encoding = UTF-8.
2localhost.org.apache.juli.FileHandler.level = FINE
2localhost.org.apache.juli.FileHandler.directory = ${catalina.base}/logs
2localhost.org.apache.juli.FileHandler.prefix = localhost
2localhost.org.apache.juli.AsyncFileHandler.encoding = UTF-8.
3manager.org.apache.juli.FileHandler.level = FINE
3manager.org.apache.juli.FileHandler.directory = ${catalina.base}/logs
3manager.org.apache.juli.FileHandler.prefix = manager
3manager.org.apache.juli.AsyncFileHandler.encoding = UTF-8.
4host-manager.org.apache.juli.FileHandler.level = FINE
4host-manager.org.apache.juli.FileHandler.directory = ${catalina.base}/logs
4host-manager.org.apache.juli.FileHandler.prefix = host-manager
4host-manager.org.apache.juli.AsyncFileHandler.encoding = UTF-8.
java.util.logging.ConsoleHandler.level = FINE
java.util.logging.ConsoleHandler.formatter = java.util.logging.SimpleFormatter
java.util.logging.ConsoleHandler.encoding = UTF-8
############################################################
# Facility specific properties.
# Provides extra control for each logger.
############################################################
org.apache.catalina.core.Containerbase.[Catalina].[localhost].level = INFO
org.apache.catalina.core.Containerbase.[Catalina].[localhost].handlers = 2localhost.org.apache.juli.FileHandler
org.apache.catalina.core.Containerbase.[Catalina].[localhost].[/manager].level = INFO
org.apache.catalina.core.Containerbase.[Catalina].[localhost].[/manager].handlers = 3manager.org.apache.juli.FileHandler
org.apache.catalina.core.Containerbase.[Catalina].[localhost].[/host-manager].level = INFO
org.apache.catalina.core.Containerbase.[Catalina].[localhost].[/host-manager].handlers = 4host-manager.org.apache.juli.FileHandler
# For example, to log debug messages in ContextConfig and HostConfig
# classes and to log only warnings and errors in other
# org.apache.catalina.** classes, uncomment these lines:
#org.apache.catalina.startup.ContextConfig.level = FINE
#org.apache.catalina.startup.HostConfig.level = FINE
#org.apache.catalina.level = WARNING
其中，这是catalina输出控制台的编码格式
1catalina.org.apache.juli.AsyncFileHandler.encoding = UTF-8.
其中，这是本地控制台的编码格式
2localhost.org.apache.juli.AsyncFileHandler.encoding = UTF-8.
其中，这是Java控制台的编码格式
java.util.logging.ConsoleHandler.encoding = UTF-8
设置完这三个编码格式以后，Tomcat就不会出现中文乱码问题啦~
