如何在java中从客户端发送到服务器之后暂停特定字符串？

I have done a small application that search for Bluetooth devices and gets its Bluetooth address. After getting the Bluetooth address the application will check in a text file (this file contain a number of Bluetooth addresses) if the discovered Bluetooth address matches any of the ones in the text file then send that address to the server (this process will repeated many times because it is a loop). Note: the Bluetooth address is stored in a String.I have done a small application that search for