Java读取Excel内容

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;

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();

       }

      

    }

    /**

     * 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

     * @param file 读取数据的源Excel

     * @param ignoreRows 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

     * @throws FileNotFoundException

     * @throws IOException

     */

    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;

    }

   

    /**

     * 去掉字符串右边的空格

     * @param str 要处理的字符串

     * @return 处理后的字符串

     */

     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);

    }

}

 兼容性更高代码：

package com.shuilangyizu.util;

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.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.openxml4j.opc.OPCPackage;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
/**
 * 重写平台导入功能
 * @author Administrator
 * 2019-03-19
 */
public class ExcelsUtil {
    /**
     * 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
     * @param file 读取数据的源Excel
     * @param ignoreRows 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
     * @throws FileNotFoundException
     * @throws IOException
     * @throws InvalidFormatException 
     */
    public static String[][] getData(File file, int ignoreRows)
           throws Exception {
       List<String[]> result = new ArrayList<String[]>();
       int rowSize = 0;
       BufferedInputStream in = new BufferedInputStream(new FileInputStream(
              file));
       String[][] returnArray = null;
　　　　// xls
       if (POIFSFileSystem.hasPOIFSHeader(in)) {
           // 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();
           returnArray = new String[result.size()][rowSize];
           for (int i = 0; i < returnArray.length; i++) {
               returnArray[i] = (String[]) result.get(i);
           }
　　　　// xlsx
       }else{
           XSSFWorkbook wb = new XSSFWorkbook(OPCPackage.open(in));
           XSSFCell cell = null;
           for (int sheetIndex = 0; sheetIndex < wb.getNumberOfSheets(); sheetIndex++) {
               XSSFSheet st = wb.getSheetAt(sheetIndex);
               // 第一行为标题，不取
               for (int rowIndex = ignoreRows; rowIndex <= st.getLastRowNum(); rowIndex++) {
                  XSSFRow 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();
           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
     * @param str 要处理的字符串
     * @return 处理后的字符串
     */
     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);
    }
}