some characters cannot be mapped using iso-8859-1

中文显示为乱码，解决方法如下，亲测有效

ISO-8859-1改为UTF-8

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>

改为
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>