如何用Java得到Excel中Formula的值

工具1：POI
POI是常用的读取Office文件的开源工具。但是在它正式发布的版本中没有提供得到Excel中Formula值的功能。
这个POI还在开发中的功能。相关信息 请看 http://jakarta.apache.org/poi/hssf/eval.html

工具2：JExcelAPI
Java Excel API - A Java API to read, write, and modify Excel spreadsheets
http://jexcelapi.sourceforge.net/
目前的最新版本是2.6 

Some Features
* Reads data from Excel 95, 97, 2000, XP, and 2003 workbooks
* Reads and writes formulas (Excel 97 and later only)
* Generates spreadsheets in Excel 2000 format
* Supports font, number and date formatting
* Supports shading, bordering, and coloring of cells
* Modifies existing worksheets
* Is internationalized, enabling processing in almost any locale, country, language, or character encoding (formulas are currently only supported in English, French, * * Spanish, and German, but more can be added if translated)
* Supports copying of charts
* Supports insertion and copying of images into spreadsheets
* Supports logging with Jakarta Commons Logging, log4j, JDK 1.4 Logger, etc
...and much more

　

  1  import  java.io.BufferedWriter;
  2  import  java.io.File;
  3  import  java.io.IOException;
  4  import  java.io.OutputStream;
  5  import  java.io.OutputStreamWriter;
  6  import  java.io.UnsupportedEncodingException;
  7 
  8  import  java.util.ArrayList;
  9  import  java.util.Iterator;
 10 
 11  import  jxl.Cell;
 12  import  jxl.CellType;
 13  import  jxl.FormulaCell;
 14  import  jxl.Sheet;
 15  import  jxl.Workbook;
 16  import  jxl.biff.CellReferenceHelper;
 17  import  jxl.biff.formula.FormulaException;
 18 
 19  /**
 20   * Goes through each cell in the workbook, and if the contents of that cell is a
 21   * formula, it prints out the last calculated value and the formula string
 22    */
 23  public   class  Formulas {
 24 
 25       public   static   void  main(String[] args) {
 26          String file  =   " jxlrwtest.xls " ;
 27          String encoding  =   " UTF8 " ;
 28           try  {
 29              Workbook w  =  Workbook.getWorkbook( new  File(file));
 30              Formulas f  =   new  Formulas(w, System.out, encoding);
 31              w.close();
 32          }  catch  (Exception e) {
 33              e.printStackTrace();
 34          }
 35      }
 36 
 37       /**
 38       * Constructor
 39       * 
 40       *  @param  w
 41       *            The workbook to interrogate
 42       *  @param  out
 43       *            The output stream to which the CSV values are written
 44       *  @param  encoding
 45       *            The encoding used by the output stream. Null or unrecognized
 46       *            values cause the encoding to default to UTF8
 47       *  @exception  java.io.IOException
 48        */
 49       public  Formulas(Workbook w, OutputStream out, String encoding)
 50               throws  IOException {
 51           if  (encoding  ==   null   ||   ! encoding.equals( " UnicodeBig " )) {
 52              encoding  =   " UTF8 " ;
 53          }
 54 
 55           try  {
 56              OutputStreamWriter osw  =   new  OutputStreamWriter(out, encoding);
 57              BufferedWriter bw  =   new  BufferedWriter(osw);
 58 
 59              ArrayList parseErrors  =   new  ArrayList();
 60 
 61               for  ( int  sheet  =   0 ; sheet  <  w.getNumberOfSheets(); sheet ++ ) {
 62                  Sheet s  =  w.getSheet(sheet);
 63 
 64                  bw.write(s.getName());
 65                  bw.newLine();
 66 
 67                  Cell[] row  =   null ;
 68                  Cell c  =   null ;
 69 
 70                   for  ( int  i  =   0 ; i  <  s.getRows(); i ++ ) {
 71                      row  =  s.getRow(i);
 72 
 73                       for  ( int  j  =   0 ; j  <  row.length; j ++ ) {
 74                          c  =  row[j];
 75                           if  (c.getType()  ==  CellType.NUMBER_FORMULA
 76                                   ||  c.getType()  ==  CellType.STRING_FORMULA
 77                                   ||  c.getType()  ==  CellType.BOOLEAN_FORMULA
 78                                   ||  c.getType()  ==  CellType.DATE_FORMULA
 79                                   ||  c.getType()  ==  CellType.FORMULA_ERROR) {
 80                              FormulaCell nfc  =  (FormulaCell) c;
 81                              StringBuffer sb  =   new  StringBuffer();
 82                              CellReferenceHelper.getCellReference(c.getColumn(),
 83                                      c.getRow(), sb);
 84 
 85                               try  {
 86                                  bw.write( " Formula in  "   +  sb.toString()
 87                                           +   "  value:   "   +  c.getContents());
 88                                  bw.flush();
 89                                  bw.write( "  formula:  "   +  nfc.getFormula());
 90                                  bw.flush();
 91                                  bw.newLine();
 92                              }  catch  (FormulaException e) {
 93                                  bw.newLine();
 94                                  parseErrors
 95                                          .add(s.getName()  +   ' ! '   +  sb.toString()
 96                                                   +   " :  "   +  e.getMessage());
 97                              }
 98                          }
 99                      }
100                  }
101              }
102              bw.flush();
103              bw.close();
104 
105               if  (parseErrors.size()  >   0 ) {
106                  System.err.println();
107                  System.err.println( " There were  "   +  parseErrors.size()
108                           +   "  errors " );
109 
110                  Iterator i  =  parseErrors.iterator();
111                   while  (i.hasNext()) {
112                      System.err.println(i.next());
113                  }
114              }
115          }  catch  (UnsupportedEncodingException e) {
116              System.err.println(e.toString());
117          }
118      }
119  }

两篇中文的介绍：
http://www.chinaitpower.com/A/2005-03-03/109739.html
http://www.myfaq.com.cn/A200507/2005-07-24/166992.html