Java 如何使用log4j写入文本文件？
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how to write to a text file using to log4j?
提问by RanZilber
I'm wondering how to convert the following code to output those lines into a text file, and not to standard output:
我想知道如何将以下代码转换为将这些行输出为文本文件，而不是标准输出：
import org.apache.log4j.Logger; import org.apache.log4j.PropertyConfigurator;
public class HelloWorld {
static final Logger logger = Logger.getLogger(HelloWorld.class);
public static void main(String[] args) {
PropertyConfigurator.configure("log4j.properties");
logger.debug("Sample debug message");
logger.info("Sample info message");
logger.warn("Sample warn message");
logger.error("Sample error message");
logger.fatal("Sample fatal message");
}
}
The properties file is :
属性文件是：
log4j.rootLogger=DEBUG, CA
log4j.appender.CA=org.apache.log4j.ConsoleAppender
log4j.appender.CA.layout=org.apache.log4j.PatternLayout
log4j.appender.FA.layout.ConversionPattern=%m%n
Thanks.
谢谢。
采纳答案by DwB
Change the ConsoleAppender to a FileAppender.
将 ConsoleAppender 更改为 FileAppender。
I find the org.apache.log4j.RollingFileAppenderto be useful.
If you use this,
you must add a property for the fileName and
may want to set the maxFileSize as well.
Here is an example (put these in the log4j.properties file):
我觉得org.apache.log4j.RollingFileAppender很有用。如果使用它，则必须为 fileName 添加一个属性，并且可能还想设置 maxFileSize。这是一个示例（将它们放在 log4j.properties 文件中）：
log4j.appender.NotConsole=org.apache.log4j.RollingFileAppender
log4j.appender.NotConsole.fileName=/some/path/to/a/fileName.log
log4j.appender.NotConsole.maxFileSize=20MB
There are other appenders.
DailyRollingFileAppenderrolls based on time.
FileAppenderdoes not roll.
If you use the RollingFileAppender,
you will need to guess as to a good value for maxFileSize and
then address the size at a future date if it is causing issues.
还有其他附加程序。
DailyRollingFileAppender根据时间滚动。
FileAppender不滚动。如果您使用RollingFileAppender，则需要猜测 maxFileSize 的合适值，然后在未来某个日期解决导致问题的大小。
回答by AlexR
Shortly use FileAppender instead of ConsoleAppender.
很快使用 FileAppender 而不是 ConsoleAppender。
Here is a simple example of configuration. It additionally configures the layout. You can omit it for the first approach.
下面是一个简单的配置示例。它还配置了布局。对于第一种方法，您可以省略它。
log4j.appender.F=org.apache.log4j.FileAppender
log4j.appender.F.File=mylog.log
log4j.appender.F.layout=org.apache.log4j.PatternLayout
log4j.appender.F.layout.ConversionPattern=%d{MM-dd@HH:mm:ss} %-5p (%13F:%L) %3x - %m%n
回答by Muhammad Abid
following configuration should aslo work
以下配置应该也可以工作
direct log messages to stdout ###
将日志消息直接发送到标准输出 ###
log4j.appender.stdout=org.apache.log4j.FileAppender
log4j.appender.stdout.fileName=error.log
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n
log4j.appender.stdout=org.apache.log4j.FileAppender
log4j.appender.stdout.fileName=error.log
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=% d{绝对} %5p %c{1}:%L - %m%n
回答by Thailand
in log4j.properties
在 log4j.properties 中
# Define the root logger with file appender
log4j.logger.App = DEBUG ,CA
#set file text
log4j.appender.CA = org.apache.log4j.RollingFileAppender
log4j.appender.CA.File = D:\database.log
log4j.appender.CA.maxFileSize = 20MB
log4j.appender.CA.MaxBackupIndex=10
log4j.appender.CA.layout=org.apache.log4j.PatternLayout
log4j.appender.CA.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n
回答by harshainfo
The following would be helpful:
以下内容会有所帮助：
Class containing main method
包含主要方法的类
package abc;
import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;
public class ClassOne {
static Logger logger = Logger.getLogger(ClassOne.class);
public static void main(String[] args) {
PropertyConfigurator.configure("log4j.info"); //log4j.info file should be in the class path(same location as ClassOne.class)
logger.info("Program started.... "); //Whenever you want to write something to the log text file use logger.info("Log Message")
}
}
log4j.info file
log4j.info 文件
log4j.rootLogger=INFO, FILE
# Define the file appender
log4j.appender.FILE=org.apache.log4j.FileAppender // Replacing ConsoleAppender with FileAppender gives text file logging
# Set the name of the file
log4j.appender.FILE.File=src/abc/log.out //Here you can specify either absolute or relative path
# Set the immediate flush to true (default)
log4j.appender.FILE.ImmediateFlush=true
# Set the threshold to debug mode
log4j.appender.FILE.Threshold=debug
# Set the append to false, overwrite
log4j.appender.FILE.Append=false
# Define the layout for file appender
log4j.appender.FILE.layout=org.apache.log4j.PatternLayout
log4j.appender.FILE.layout.conversionPattern=%d %m%n
