java中将对象写到临时文件，并让临时文件在何时的时候自动删除

import java.io.File;
import java.io.FileOutputStream;
import java.io.ObjectOutputStream;


try
{
File fl = null;
FileOutputStream fos = null;
ObjectOutputStream out = null;
try
{
fl = File.createTempFile("smxttmp", ".txt");
fos = new FileOutputStream(fl);
System.out.println(fl.getAbsolutePath());
out = new ObjectOutputStream(fos);
out.writeObject("good");
}
finally
{
if(null != out)
{
out.flush(); // 如果没有这行就会发生严重的貌似JVM bug的超级异常错误，详细见http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6406859
out.close();
}
if(null != fos)
fos.close();
if(null != fl)
{
fl.deleteOnExit(); // 令临时文件在JVM关闭的时候自动删除
fl.delete(); // 立刻删除临时文件
}
}

}catch(Exception e)
{
e.printStackTrace();
}