If tshark can support “export objects” like wireshark for GUI

Could you explain me why tshark doesn't support "export objects" like wireshark? I

because nobody had the time and/or interest to implement that feature yet.

If the "export objects" feature in GUI does not work for you (because you want to automate it), there are other (CLI) tools.

http://code.google.com/p/nfex/
https://isc.sans.edu/diary/Tools+for+extracting+files+from+pcaps/6961

Maybe one of those will help you.

Regards
Kurt

As of Wireshark 2.3.0, you can export HTTP objects with tshark. (Wireshark 2.3.0 hasn't been released yet, so you can grab a daily build from here.)

To extract HTTP objects from the command-line, run the following command:

tshark -r mypcap.pcap --export-objects "http,destdir"