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    1. POI
        POIµÄHSSFWorkbookÀàÓÐwriteProtectWorkbook(password, username)¡£Õâ±ß¿ÉÒÔÉèÖÃÃÜÂëºÍÊÂË­±£»¤µÄ£¬µ«Õâ¸ö¹ËÃû˼Òå¾Íд±£»¤£¬ÊµÏÖºÍExcelµÄbook±£»¤ÓгöÈë¡£
        µ±È»£¬sheet±£»¤µÄ»°ÓÃHSSFSheetÀàµÄprotectSheet(password)·½·¨¾Í¿ÉÒÔÁË¡£
    2. JXL
         WorkbookÀàµÄsetProtected£¨boolean£©·½·¨¸Ð¾õÊÇÓÃÀ´×öbook±£»¤µÄ£¬µ«¿´ÁË˵Ã÷ÊÇÉèÖÃsheet±£»¤µÄ¡£Òò´ËÒ²ÊÇʵÏÖ²»ÁËbook±£»¤µÄЧ¹û¡£
   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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