中文乱码问题

1)
filename = new String("健康建议.xls".getBytes("ISO-8859-1"), "utf-8");
			filename = new String("健康建议.xls".getBytes(), "utf-8");
			filename = new String("健康建议.xls".getBytes(), "GBK");
			filename = new String("健康建议.xls".getBytes(), "gb2312");
			filename = new String("健康建议.xls".getBytes("ISO-8859-1"), "utf-8");
			filename = new String("健康建议.xls".getBytes("ISO-8859-1"), "GBK");
			filename = new String("健康建议.xls".getBytes("ISO-8859-1"), "gb2312");


2)
filename = new String("健康建议.xls".getBytes("gb2312"), "ISO8859-1");

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