java写入日志文件

首先要定义日志的四个等级:info,debug,error,fatal，还要建日志输出方式,如console,file,html,database;以上信息可以放到.properties文件中。
建类，来实现各种方式的输出。如：

private static Log log = new Log();
private Log()
{

}

public static Log getLog()
{
return log;
}

private void getInfoBylogShow(String logShow,String logStr)
{
String fileName   = Thread.currentThread().getStackTrace()[2].getFileName();
String className  = Thread.currentThread().getStackTrace()[2].getClassName();
String methodName = Thread.currentThread().getStackTrace()[2].getMethodName();
int lineNumber    = Thread.currentThread().getStackTrace()[2].getLineNumber();
Date date = new Date(System.currentTimeMillis());
SimpleDateFormat simpleFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
if(logShow.indexOf("console") != -1)
{
System.out.printf("%s--%-20s%-30s%-15s%-6d%-40s\n", simpleFormat.format(date),
fileName, className, methodName, lineNumber, logStr);
}
if(logShow.indexOf("file") != -1)
{
FileWriter fileWriter;
try
{
fileWriter = new FileWriter(NewsConfig.FileName,true);
fileWriter.write("时间:" + simpleFormat.format(date).toString() + "\r");
fileWriter.write("文件名:" + fileName + "\r");
fileWriter.write("类名:" + className + "\r");
fileWriter.write("方法名:" + methodName + "\r");
fileWriter.write("行号:" + lineNumber + "行\r");
fileWriter.write("信息:" + logStr + "\r\n");
fileWriter.flush();
fileWriter.close();
}
catch (IOException e)
{
e.printStackTrace();
}
}
if(logShow.indexOf("html") != -1)
{

}
if(logShow.indexOf("database") != -1)
{

}
}

3.在操作方法中调用日志类

Log.getLog().info("获取分页列表！");