請高手來幫忙一下(JAVA)

You can try the followings:

1. This site has a zip file for windows environment, I have downloaded it and scan it with anti-virus software already. Seems to be ok:
http://www.2dtg.com/demo.html

2. http://www.softrecipe.com/Software-Development/Java-JavaScript/j4lqrcode.html

3. This site gives you a simple java code that reads QR code. It is in Chinese (big5):
http://www.javaworld.com.tw/jute/post/view?bid=26&id=184202&tpg=1&ppg=1&sty=3&age=0