How do I deal with the Chinese to submit my website

I encountered such a problem in the development of coding, Ask for help:
I use of winNet.dll library to  submit data to my website,GET way, the data in Chinese,  I founded
the parameters were garbled, mywebsite use of Java language development, encoding is UTF-8
Would you please tell me how to make submissions Chinese not garbled? 
How do I deal with the Chinese in the MQL file? I receive the parameter directly in the backstage, carries on the code conversion, then I should use what code to transform these Chinese parameters?