实际上算不上框架，只是自己对日志框架的一点理解。
核心接口：Logger，供调用者完成不同等级的日志输出
package com.lichmama.log.service; public interface Logger
{
public void debug(String msg); public void debug(String format, Object... args); public void info(String msg); public void info(String format, Object... args); public void warn(String msg); public void warn(String format, Object... args); public void error(String msg); public void error(String format, Object... args); public void fatal(String msg); public void fatal(String format, Object... args);
}
核心接口：LogWriter，内部使用，完成日志输出到文件或控制台的过程
package com.lichmama.log.service; public interface LogWriter
{
public void log(String log);
}
核心接口：LoggerBuilder，日志实例的生成器，提供对不同类型的日志实例的生成接口
package com.lichmama.log.service; public interface LoggerBuilder
{
//运行时日志
public Logger getRunLogger(Class<?> T); //命令行日志
public Logger getConLogger(Class<?> T);
}
日志类型枚举：LogType
package com.lichmama.log.service; public enum LogType
{
RUNTIME, CONSOLE
}
接口实现类：LogWriterImpl，具体实现日志输出行为
package com.lichmama.log.service.impl; import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer; import com.lichmama.log.service.LogType;
import com.lichmama.log.service.LogWriter; public class LogWriterImpl implements LogWriter
{
private Writer logWriter; public LogWriterImpl(LogType logType)
{
try
{
switch (logType)
{
case RUNTIME:
logWriter = new OutputStreamWriter(new FileOutputStream("D:\\log\\test\\runtime.log", true));
break;
case CONSOLE:
logWriter = new OutputStreamWriter(System.out);
break;
}
}
catch (Exception e)
{
e.printStackTrace();
} } @Override
public void log(String log)
{
try
{
logWriter.write(log);
logWriter.flush();
}
catch (IOException e)
{
e.printStackTrace();
}
} }
接口实现类：LoggerFactory，日志工厂类，用来生成不同类型的日志示例
package com.lichmama.log.service.impl; import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map; import com.lichmama.log.service.LogType;
import com.lichmama.log.service.LogWriter;
import com.lichmama.log.service.Logger;
import com.lichmama.log.service.LoggerBuilder; public class LoggerFactory implements LoggerBuilder
{
private LoggerFactory(){} private static class SingletonHolder
{
private static final LoggerFactory instance = new LoggerFactory();
} public static final LoggerFactory getInstance()
{
return SingletonHolder.instance;
} private static ThreadLocal<Map<String, Logger>> loggers = new ThreadLocal<Map<String, Logger>>() {
@Override
public Map<String, Logger> initialValue()
{
return new HashMap<String, Logger>();
}
}; @Override
public Logger getRunLogger(Class<?> T)
{
return getLogger(T, LogType.RUNTIME);
} @Override
public Logger getConLogger(Class<?> T)
{
return getLogger(T, LogType.CONSOLE);
} private Logger getLogger(Class<?> T, LogType logType)
{
String tagName = T.getName() + "@" + logType;
Logger logger = loggers.get().get(tagName);
if (logger == null)
{
logger = new LoggerInstance(T.getName(), new LogWriterImpl(logType));
loggers.get().put(tagName, logger);
}
return logger;
} private class LoggerInstance implements Logger
{
private LogWriter logWriter;
private String module;
private SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss"); public LoggerInstance(String module, LogWriter logWriter)
{
this.module = module;
this.logWriter = logWriter;
} @Override
public void debug(String msg)
{
log(msg, "DEBUG");
} @Override
public void info(String msg)
{
log(msg, "INFO");
} @Override
public void warn(String msg)
{
log(msg, "WARN");
} @Override
public void error(String msg)
{
log(msg, "ERROR");
} @Override
public void fatal(String msg)
{
log(msg, "FATAL");
} private void log(String msg, String logLevel)
{
String logText = String.format("%s-[%s] [%s] %s\r\n", sdf.format(new Date()), module, logLevel, msg);
logWriter.log(logText);
} @Override
public void debug(String format, Object... args)
{
String logText = String.format(format, args);
debug(logText);
} @Override
public void info(String format, Object... args)
{
String logText = String.format(format, args);
info(logText);
} @Override
public void warn(String format, Object... args)
{
String logText = String.format(format, args);
warn(logText);
} @Override
public void error(String format, Object... args)
{
String logText = String.format(format, args);
error(logText);
} @Override
public void fatal(String format, Object... args)
{
String logText = String.format(format, args);
fatal(logText);
}
}
}
使用：
public class Test
{
public static void main(String[] args)
{
Logger logger = LoggerFactory.getInstance().getConLogger(Test.class);
logger.warn("winter is coming");
logger.debug("%s said, 'valar morghulis'", "Jaqen H'ghar");
logger.info("%s answered: %s", "Arya", "Valar Dohaeris");
}
}
####################################################################################
CONSOLE OUTPUT:
####################################################################################
20160728171925-[com.lichmama.log.service.test.Test] [WARN] winter is coming
20160728171925-[com.lichmama.log.service.test.Test] [DEBUG] Jaqen H'ghar said, 'valar morghulis'
20160728171925-[com.lichmama.log.service.test.Test] [INFO] Arya answered: Valar Dohaeris