java读取excel内容

原文出自：博客园@龚明秋

借助于apathe的poi.jar，由于上传文件不支持.jar所以请下载后将文件改为.jar，在应用程序中添加poi.jar包，并将需要读取的excel文件放入根目录即可

本例使用java来读取excel的内容并展出出结果，代码如下：

 

 

import java.io.BufferedInputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.text.DecimalFormat;

import java.text.SimpleDateFormat;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.Date;

import java.util.List;

 

import org.apache.poi.hssf.usermodel.HSSFCell;

importorg.apache.poi.hssf.usermodel.HSSFDateUtil;

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.poifs.filesystem.POIFSFileSystem;

 

publicclass ExcelOperate {

 

    publicstaticvoid main(String[] args)throws Exception {

       File file  = new File("ExcelDemo.xls");

       String[][]  result = getData(file, 1);

        int rowLength = result.length;

        for(int i=0;i<rowLength;i++) {

            for(int j=0;j<result[i].length;j++)  {

               System.out.print(result[i][j]+"\t\t");

            }

            System.out.println();

        }

       

    }

    /**

     *读取Excel的内容，第一维数组存储的是一行中格列的值，二维数组存储的是多少个行

     *@paramfile读取数据的源Excel

     *@paramignoreRows读取数据忽略的行数，比喻行头不需要读入忽略的行数为1

     *@return读出的Excel中数据的内容

     *@throwsFileNotFoundException

     *@throwsIOException

     */

    publicstatic String[][] getData(File file,int ignoreRows)

            throws FileNotFoundException, IOException {

        List<String[]> result = new ArrayList<String[]>();

        int rowSize = 0;

        BufferedInputStream in =new BufferedInputStream(new FileInputStream(

               file));

        // 打开HSSFWorkbook

        POIFSFileSystem fs = new POIFSFileSystem(in);

        HSSFWorkbook wb = new HSSFWorkbook(fs);

       HSSFCell  cell = null;

        for (int sheetIndex = 0; sheetIndex < wb.getNumberOfSheets(); sheetIndex++)  {

            HSSFSheet st = wb.getSheetAt(sheetIndex);

            // 第一行为标题，不取

            for (int rowIndex = ignoreRows; rowIndex <= st.getLastRowNum(); rowIndex++)  {

               HSSFRow row = st.getRow(rowIndex);

               if (row ==null)  {

                   continue;

               }

               int tempRowSize = row.getLastCellNum() + 1;

               if (tempRowSize > rowSize) {

                   rowSize = tempRowSize;

               }

               String[] values =new String[rowSize];

               Arrays.fill(values,"");

               boolean hasValue =false;

               for (short columnIndex = 0; columnIndex <= row.getLastCellNum(); columnIndex++)  {

                   String value ="";

                   cell = row.getCell(columnIndex);

                   if (cell !=null)  {

                      //  注意：一定要设成这个，否则可能会出现乱码

                      cell.setEncoding(HSSFCell.ENCODING_UTF_16);

                      switch (cell.getCellType()) {

                      case HSSFCell.CELL_TYPE_STRING:

                          value = cell.getStringCellValue();

                          break;

                      case HSSFCell.CELL_TYPE_NUMERIC:

                          if (HSSFDateUtil.isCellDateFormatted(cell))  {

                             Date date = cell.getDateCellValue();

                             if (date !=null)  {

                                 value = new SimpleDateFormat("yyyy-MM-dd")

                                       .format(date);

                             } else {

                                 value = "";

                             }

                          } else {

                             value =new DecimalFormat("0").format(cell

                                    .getNumericCellValue());

                          }

                          break;

                      case HSSFCell.CELL_TYPE_FORMULA:

                          // 导入时如果为公式生成的数据则无值

                          if (!cell.getStringCellValue().equals(""))  {

                             value = cell.getStringCellValue();

                          } else {

                             value = cell.getNumericCellValue() +"";

                          }

                          break;

                      case HSSFCell.CELL_TYPE_BLANK:

                          break;

                      case HSSFCell.CELL_TYPE_ERROR:

                          value ="";

                          break;

                      case HSSFCell.CELL_TYPE_BOOLEAN:

                          value = (cell.getBooleanCellValue() ==true ?"Y"

                                 : "N");

                          break;

                      default:

                          value ="";

                      }

                   }

                   if (columnIndex == 0 && value.trim().equals(""))  {

                      break;

                   }

                   values[columnIndex] =rightTrim(value);

                   hasValue = true;

               }

 

               if (hasValue) {

                   result.add(values);

               }

            }

        }

        in.close();

       String[][]  returnArray =new String[result.size()][rowSize];

        for (int i = 0; i < returnArray.length;  i++) {

            returnArray[i] = (String[]) result.get(i);

        }

        return returnArray;

    }

   

    /**

     *去掉字符串右边的空格

     *@paramstr要处理的字符串

     *@return处理后的字符串

     */

     publicstatic String rightTrim(String str) {

        if (str ==null)  {

            return"";

        }

        int length = str.length();

        for (int i = length - 1; i >= 0; i--) {

            if (str.charAt(i) != 0x20) {

               break;

            }

            length--;

        }

        return str.substring(0, length);

    }

}