为什么会提示打不开Connection连接

![![![![图片说明](https://img-ask.csdn.net/upload/201611/27/1480232641_946158.png)图片说明](https://img-ask.csdn.net/upload/201611/27/1480232623_57230.png)图片说明](https://img-ask.csdn.net/upload/201611/27/1480232619_786368.png)图片说明](https://img-ask.csdn.net/upload/201611/27/1480232609_824972.png)图片说明

conntion.设成公共的呢。public