POI经常使用功能整理

1.读取excel文件 读取.xlsx常见方式有：web 1. Workbook wb = new XSSFWorkbook(new FileInputStream(fileName)); 2. Workbook wb = WorkbookFactory.create( new File(filename)); 读取.xls常见的方式有：svg 1. Workbook wb = new HSSFW

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