mirror of https://github.com/apache/poi.git
Add util method to check date formatting in Excel, submitted by Jason Hoffman
git-svn-id: https://svn.apache.org/repos/asf/jakarta/poi/trunk@352695 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Avik Sengupta
parent
34de41e82a
commit
40c021bec3
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@ -37,7 +37,7 @@
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Does HSSF support protected spreadsheets?
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</question>
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<answer>
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Protecting a spreadsheet encripts it. We wont touch encription because we're not legally educated
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Protecting a spreadsheet encrypts it. We wont touch encryption because we're not legally educated
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and don't understand the full implications of trying to implement this. If you wish to have a go
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at this feel free to add it as a plugin module. We wont be hosting it here however.
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</answer>
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@ -48,20 +48,15 @@
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</question>
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<answer>
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Excel stores dates as numbers therefore the only way to determine if a cell is
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actually stored as a date is to look at the formatting. This solution from
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Jason Hoffman:
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<p>
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Okay, here is a little code I used to determine if the cell was a number or
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date, and then format appropriately. I hope it helps. I keep meaning to
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submit a patch with the helper method below.... but just haven't had a
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chance.
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</p>
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actually stored as a date is to look at the formatting. There is a helper method
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in HSSFDateUtil (since after 1.6.0-dev) that checks for this.
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Thanks to Jason Hoffman for providing the solution.
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<source>
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/////// code snippet ////////////
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case HSSFCell.CELL_TYPE_NUMERIC:
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case HSSFCell.CELL_TYPE_NUMERIC:
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double d = cell.getNumericCellValue();
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// test if a date!
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if (isCellDateFormatted(cell)) {
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if (HSSFDateUtil.isCellDateFormatted(cell)) {
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// format in form of M/D/YY
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cal.setTime(HSSFDateUtil.getJavaDate(d));
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cellText =
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@ -70,45 +65,13 @@ case HSSFCell.CELL_TYPE_NUMERIC:
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cal.get(Calendar.DAY_OF_MONTH) + "/" +
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cellText;
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}
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/////// end code snippet ////////////
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// HELPER METHOD BELOW TO DETERMINE IF DATE
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// method to determine if the cell is a date, versus a number...
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public static boolean isCellDateFormatted(HSSFCell cell) {
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boolean bDate = false;
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double d = cell.getNumericCellValue();
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if ( HSSFDateUtil.isValidExcelDate(d) ) {
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HSSFCellStyle style = cell.getCellStyle();
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int i = style.getDataFormat();
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switch(i) {
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// Internal Date Formats as described on page 427 in
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// Microsoft Excel Dev's Kit...
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case 0x0e:
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case 0x0f:
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case 0x10:
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case 0x11:
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case 0x12:
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case 0x13:
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case 0x14:
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case 0x15:
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case 0x16:
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case 0x2d:
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case 0x2e:
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case 0x2f:
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bDate = true;
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break;
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default:
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bDate = false;
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break;
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}
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}
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return bDate;
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}
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</source>
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</answer>
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</faq>
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<faq>
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<question>
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I'm trying to stream an XLS file from a servlet and I'm having some trouble. What's the problem?
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</question>
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@ -125,8 +88,9 @@ public static boolean isCellDateFormatted(HSSFCell cell) {
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The problem in most versions of IE is that it does not use the mime type on
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the HTTP response to determine the file type; rather it uses the file extension
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on the request. Thus you might want to add a <strong>.xls</strong> to your request
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string. For example http://yourserver.com/myServelet.xls?param1=xx. Sometimes
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a request like http://yourserver.com/myServelet?param1=xx&dummy=file.xls is also
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string. For example <em>http://yourserver.com/myServelet.xls?param1=xx</em>. This is
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easily accomplished through URL mapping in any servlet container. Sometimes
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a request like <em>http://yourserver.com/myServelet?param1=xx&dummy=file.xls</em> is also
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known to work.
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</p>
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<p>
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@ -137,7 +101,7 @@ public static boolean isCellDateFormatted(HSSFCell cell) {
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request as mentioned above.)
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</p>
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<p>
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Note also that sometimes when you request a document that is opened with an
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Note also that when you request a document that is opened with an
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external handler, IE sometimes makes two requests to the webserver. So if your
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generating process is heavy, it makes sense to write out to a temporary file, so that multiple
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requests happen for a static file.
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@ -142,6 +142,46 @@ public class HSSFDateUtil
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}
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}
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/**
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* Check if a cell contains a date
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* Since dates are stored internally in Excel as double values
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* we infer it is a date if it is formatted as such.
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*/
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public static boolean isCellDateFormatted(HSSFCell cell) {
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if (cell == null) return false;
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boolean bDate = false;
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double d = cell.getNumericCellValue();
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if ( HSSFDateUtil.isValidExcelDate(d) ) {
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HSSFCellStyle style = cell.getCellStyle();
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int i = style.getDataFormat();
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switch(i) {
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// Internal Date Formats as described on page 427 in
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// Microsoft Excel Dev's Kit...
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case 0x0e:
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case 0x0f:
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case 0x10:
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case 0x11:
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case 0x12:
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case 0x13:
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case 0x14:
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case 0x15:
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case 0x16:
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case 0x2d:
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case 0x2e:
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case 0x2f:
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bDate = true;
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break;
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default:
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bDate = false;
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break;
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}
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}
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return bDate;
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}
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/**
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* Given a double, checks if it is a valid Excel date.
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*
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