cannot be mapped using "ISO-8859-1" character encoding

今天在修改JSP页面时，修改了部分要显示的字符为中文，然后保存提示问题如下："Reason: some
characters cannot be mapped using "ISO-8859-1" character encoding. Either change the encoding or remove the characters which are not supported by
the "ISO-8859-1" character encoding. "

提示框中有三个选项，选择保存为UTF-8。

为防止下次同样提示出现，可用如下办法解决： 

Window->Preferences->General->Content Types->Text->Jsp中设置Default encoding，把ISO-8859-1改为UTF-8，然后Update->OK。