Apache project: POI-HSSF-Java API to access Microsoft Excel format files (zt)

Introduction:

Jakarta_poi uses Java to read and write Excel (97-2002) files, which can meet most of the requirements.
Because this tool was used by a project, it took some time to translate poi itself.
A guide is provided with some reductions and modifications. I hope you can get started with this project.
Under poi, there are several self-projects: hssf is used to read and write excel. The following is the home page of hssf.
Http://jakarta.apache.org/poi/hssf/index.html

The following describes the translation based on the following addresses:
Http://jakarta.apache.org/poi/hssf/quick-guide.html

The current version of 1.51 should be a stable version for a long time, but the sample provided by hssf is not based on
1.51, so pay attention to it when using it.
In fact, several sub-projects under poi focus on the development of HDF with different read/write words.
FOP (http://xml.apache.org/fop/index.html) under XML)
PDF files can be output, which is also a good tool

Directory:
Create a workbook
Create a sheet
Create Cells
Created on cells
Set cell format

Note:
The following classes may be used:
Import org. Apache. Poi. hssf. usermodel. hssfcell;
Import org. Apache. Poi. hssf. usermodel. hssfcellstyle;
Import org. Apache. Poi. hssf. usermodel. hssfdataformat;
Import org. Apache. Poi. hssf. usermodel. hssffont;
Import org. Apache. Poi. hssf. usermodel. hssfrow;
Import org. Apache. Poi. hssf. usermodel. hssfsheet;
Import org. Apache. Poi. hssf. usermodel. hssfworkbook;
Import org. Apache. Poi. hssf. util. hssfcolor;

Create a workbook

Hssfworkbook WB = new hssfworkbook ();
// Use the default constructor to create a workbook
Fileoutputstream fileout = new fileoutputstream ("workbook.xls ");
// Specify the file name
WB. Write (fileout );
// Output to file
Fileout. Close ();

Create a sheet

Hssfworkbook WB = new hssfworkbook ();
Hssfsheet sheet1 = WB. createsheet ("new sheet ");
// Create a sheet in the workbook
Hssfsheet sheet2 = WB. createsheet ("second sheet ");
// Create another sheet in the workbook
Fileoutputstream fileout = new fileoutputstream ("workbook.xls ");
WB. Write (fileout );
Fileout. Close ();

Create Cells
Hssfworkbook WB = new hssfworkbook ();
Hssfsheet sheet = WB. createsheet ("new sheet ");
// Note that the parameters of many methods in the following code are short rather than int, so a type conversion is required.
Hssfrow ROW = sheet. createrow (short) 0 );
// Create a row in sheet
Hssfcell cell = row. createcell (short) 0 );
// Create a cell in the row
Cell. setcellvalue (1 );
// Set the cell value
// The value type parameters include multiple double, String, Boolean,
Row. createcell (short) 1). setcellvalue (1.2 );
Row. createcell (short) 2). setcellvalue ("this is a string ");
Row. createcell (short) 3). setcellvalue (true );

// Write the output to a file
Fileoutputstream fileout = new fileoutputstream ("workbook.xls ");
WB. Write (fileout );
Fileout. Close ();

Created on cells
Hssfworkbook WB = new hssfworkbook ();
Hssfsheet sheet = WB. createsheet ("new sheet ");

Hssfrow ROW = sheet. createrow (short) 0 );

Hssfcell cell = row. createcell (short) 0 );
// Set the value to date
Cell. setcellvalue (new date ());

Hssfcellstyle cellstyle = WB. createcellstyle ();
// Specify the date display format
Cellstyle. setdataformat (hssfdataformat. getformat ("m/D/yy H: mm "));
Cell = row. createcell (short) 1 );
Cell. setcellvalue (new date ());
// Set the display format of the cell date
Cell. setcellstyle (cellstyle );

Fileoutputstream fileout = new fileoutputstream ("workbook.xls ");
WB. Write (fileout );
Fileout. Close ();

Set cell format
Cell format settings include cell alignment and content font settings,
Cell background color, because there are many forms, only some examples are given. The following example shows
Poi1.5 may change.
..........
// Aqua background
Hssfcellstyle style = WB. createcellstyle ();
// Create a style
Style. setfillbackgroundcolor (hssfcellstyle. Aqua );
// Set the background color fill for this style
Style. setfillpattern (hssfcellstyle. big_spots );

// Fill type of the style.
// There are multiple styles such:
// Hssfcellstyle. big_spots
// Hssfcellstyle. fine_dots
// Hssfcellstyle. sparse_dots, etc.
Style. setalignment (hssfcellstyle. align_center );
// Align
Style. setfillbackgroundcolor (hssfcolor. Green. Index );
// Set the background color of the Unit.
Style. setfillforegroundcolor (hssfcolor. Red. Index );
// Set the cell display color
Hssfcell cell = row. createcell (short) 1 );
Cell. setcellvalue ("X ");
Cell. setcellstyle (style );

 

 

After a POI hssf file is generated
There is a main Workbook (equivalent to an Excel file) Method
Workbook. Write (outputstream) can be written to response. getoutputstream ()
If the contenttype of response is set to excel and the name of the downloaded attachment, you can download the Excel file.

Hssfworkbook book = _ proxy. expertexcel (_ formbean, _ login );

If (book! = NULL)
{
Response. setcontenttype ("application/MS-excel ");
Response. setheader ("content-disposition ",
"Attachment; filename =" + new string ("Export excel.xls". getbytes (), "iso-8859-1 "));
Book. Write (response. getoutputstream ());
}

Here, expertexcel is nothing more than getting data from the database or other places to create an Excel file.