setContentType and Setcharacterencoding

Request.setcharacterencoding () is the setting of the value taken from the request or the value taken from the database
Response.setcontenttype ("text/html;charset=gb2312") is the Chinese encoding in the settings page
The former is to set the dynamic text (parameters, database), the latter set the page static text

RESPONSE.SETCONTENTTYPE Specifies the encoding of the HTTP response and specifies the encoding that the browser displays.
Response.setcharacterencoding sets the encoding of the HTTP response, if the encoding format was previously set using Response.setcontenttype, Overwrites the previous setting with the encoding format specified by response.setcharacterencoding. As with Response.setcontenttype, this method is called, Must precede getwriter execution or before response is committed.

setContentType and Setcharacterencoding