setCharacterEncoding compilation error

response.setCharacterEncoding(“gbk”);

The jar package has been imported, and the following error is prompted:

The method setCharacterEncoding(String) is undefined for the type HttpServletResponse
Simply put, the setCharacterEncoding method is undefined.

Solution one:

response.setCharacterEncoding("gbk"); is not available in Servlet2.3, at least version 2.4 is required, if it is lower than version 2.4, you can use the following method:
response.setContentType("text/html;charset=gbk") ;

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Origin blog.csdn.net/xiaoxiamimm/article/details/114358807