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1. POI
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2. JXL
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3. OpenXLS
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// read file
WorkBook workbook = new WorkBookHandle(new FileInputStream(new File("d:/openxlsTest.xls")));
// protect
workbook.setProtected(true);
// write file
workbook.writeBytes(new FileOutputStream(new File("d:/openxlsProtect.xls")));
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