Servlet running jump page into a download interface, or Chinese garbled

1. The problem is this place, had the wrong Setvlet not recognize HTML file, into a download. 
2. This is to prevent the Chinese garbled

 // set the response content type 
response.setContentType ( "text / html; charset = utf-8 ");

 // handle Chinese garbage problem 
request.setCharacterEncoding (" UTF-8 "); 
response.setCharacterEncoding (" UTF-8 ");