调试了一上午, 蛋疼, 写代码不认真 ,记录下

	public void readFields(DataInput in) throws IOException {

		// TODO Auto-generated method stub

		//this.page = in.readUTF();

		//this.count = in.readInt();

		this.page= in.readUTF();

		this.count = in.readInt();

	}

	



	public void write(DataOutput out) throws IOException {

		// TODO Auto-generated method stub

		//out.writeUTF(this.page);

		//out.write(this.count);

		

		out.writeUTF(this.page);

		out.writeInt(this.count);

	}

数据序列化, 一定要格式相同,  检查了半天,