java读取excel(xlsx格式)内容为string

	public static String xlsx2String(File file){
		String result = "";
		try {
			FileInputStream fis = new FileInputStream(file);
			StringBuilder sb = new StringBuilder();
			XSSFWorkbook xssfWorkbook = new XSSFWorkbook(fis);
			
			//read the sheet
			for(int numSheet=0;numSheet

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