The Java Server client program is blocked by a firewall when it is running in a runtime

Recently wrote on the MyEclipse online chess code, including server side and client, let a friend to run the client after downloading, not even on the server I opened, but I shut down his firewall before he connected, I tried to set the program as a firewall credit procedures, but no, ask God Guide!! Hope you can leave a message, help a busy, I self-taught Java, some things are not too understanding! Essay at least 150 words, the following is the number of words

RFID Basic function simulation of application system

　

"Problem description"

Design and develop an application that can connect the platform of the experimental system and do the following:

1. Identify electronic labels
2. Reading data from a single block or multiple blocks
3. Write tag data in a single block
4. Perform operations that enable electronic labels to enter a silent state
5. Executable to re-enter the e-label activation state

"Task Requirements"

1. Connect the experimental system platform through the serial port method.

2, can identify the label, that is, read the UID data of the label.

3, can read the UID tag in a single block of data or block address from a location (user input), a total of n (user input) block data, and display.

4, according to the UID number to select the label to write, according to the need to write the address (user input) and data (user input) to write the tag corresponding block, and the write data operation results This state information is converted to success or error display.

5, the label of the selected UID into a silent state, the label only responds to the reset to the Ready command, and the result of the operation is converted to success or error display.

6. Return the label of the corresponding UID from the silent state to the active state, and convert the result of the operation to success or error display.

The Java Server client program is blocked by a firewall when it is running in a runtime