Java 异常处理

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
public class ExceptionDefaultHandler
{
private final static String _relativeExceptionLogPath = "log";
private final static String _defaultExceptionLogFileName = "exception.log";

// private static boolean hasFile = false;

private static void generateDefaultLogFile()
{
String absoluteFilePath = ProjectConfig.getNFSCAbsolutePath() +
File.separator + _relativeExceptionLogPath + File.separator +
_defaultExceptionLogFileName;

File file = new File(absoluteFilePath);
if(!file.exists())
{
try
{
file.createNewFile();
}
catch(IOException EX)
{
System.out.println(EX.toString());
}
}
}

private static void generateLogFile(String fileName)
{
String absoluteFilePath = ProjectConfig.getNFSCAbsolutePath() +
File.separator + _relativeExceptionLogPath + File.separator + fileName;

File file = new File(absoluteFilePath);
if(!file.exists())
{
try
{
file.createNewFile();
}
catch(IOException ex)
{
System.out.println(ex.toString());
}
}
}

public static void handle(Exception ex, String fileName)
{
generateLogFile(fileName);

String absoluteFilePath = ProjectConfig.getNFSCAbsolutePath() +
File.separator + _relativeExceptionLogPath+ File.separator + fileName;

File file = new File(absoluteFilePath);
if(file.canWrite())
{
boolean appendFlag = true;
if(file.length() > 1000000)
{
appendFlag = false;
}
PrintWriter streamWriter = null;
try
{
streamWriter = new PrintWriter(new FileOutputStream(file, appendFlag));
streamWriter.write("----------------------------------------------------------------");
streamWriter.write(DateTimeUtil.getCurrentDateLocalFormatString());
streamWriter.write("---------------------------------------------------