有这个东西，做缓存就很方便了
Map map = new HashMap();
FileOutputStream fos = new FileOutputStream("d:\\111.conf");
ObjectOutputStream o = new ObjectOutputStream(fos);
o.writeObject(map);
fos.close();
o.close();
FileInputStream fis = new FileInputStream(new File("d:\\111.conf"));
ObjectInputStream ois = new ObjectInputStream(fis);
Map map = (Map)ois.readObject();
System.out.println(map.size());
fis.close();
ois.close();
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