log4j日志输出到文件乱码

 如上图，输出乱码，原因是log4j.propertites 中缺少指定字符集

# Define the root logger with appender X
log = D:/logs
log4j.rootLogger = info, console,file

# \u8F93\u51FA\u5230\u63A7\u5236\u53F0
log4j.appender.console=org.apache.log4j.ConsoleAppender
log4j.appender.console.layout=org.apache.log4j.PatternLayout
log4j.appender.console.layout.conversionPattern=[%-20d{yyyy-MM-dd HH:mm:ss}] [%-5p] [%l]  - %m%n

#\u8F93\u51FA\u5230\u6587\u4EF6
log4j.appender.file=org.apache.log4j.RollingFileAppender
log4j.appender.file.File=${log}/sydsunew2/error2.log
log4j.appender.file.ImmediateFlush=true
log4j.appender.file.Threshold = info
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.conversionPattern=[%-20d{yyyy-MM-dd HH:mm:ss}] [%-5p] [%l]  - %m%n

解决办法：在log4j.propertites 文件里加上：

log4j.appender.file.Encoding=UTF-8

即可解决！