异常的日志信息

import java.io.;
import java.util.;
import java.text.*;
class ExceptionInfo
{
public static void main(String[] args)throws IOException
{
try
{
int[] arr = new int[2];
System.out.println(arr[3]);
}
catch (Exception e)
{

		try
		{
			Date d = new Date();
			SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
			String s = sdf.format(d);

			PrintStream ps = new PrintStream("exeception.log");
			ps.println(s);
			System.setOut(ps);

			
		}
		catch (IOException ex)
		{
			throw new RuntimeException("日志文件创建失败");
		}
		e.printStackTrace(System.out);
	}
}

}
//log4j

系统信息
import java.util.;
import java.io.;
class SystemInfo
{
public static void main(String[] args) throws IOException
{
Properties prop = System.getProperties();

	//System.out.println(prop);
	prop.list(new PrintStream("sysinfo.txt"));
}

}