Java读取excel文件 将Excel文件变为二维String数组 .

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;

import org.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;

 

public class ExcelOperate {

 

    public static void 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();

       }

      

    }

   

    public static 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;

    }

   

   

     public static 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);

    }

}