poi读取excel内容工具类

该工具类可以读取excel2007,excel2003等格式的文件，xls、xlsx文件格式

 package com.visolink;

 import org.apache.poi.hssf.usermodel.*;
 import org.apache.poi.poifs.filesystem.POIFSFileSystem;
 import org.apache.poi.ss.usermodel.Cell;
 import org.apache.poi.ss.usermodel.Row;
 import org.apache.poi.ss.usermodel.Sheet;
 import org.apache.poi.ss.usermodel.Workbook;
 import org.apache.poi.xssf.usermodel.XSSFWorkbook;

 import java.io.*;
 import java.text.SimpleDateFormat;
 import java.util.Date;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Set;

 public class ExcelReader {
     private POIFSFileSystem fs;
     private Workbook wb;
     private Sheet sheet;
     private Row row;

     /**
      * 读取Excel表格表头的内容
      * @param file
      * @return String 表头内容的数组
      */
     public String[] readExcelTitle(File file) {
         try {
             InputStream is=new FileInputStream(file);

             if(file.getName().toLowerCase().endsWith(".xls")){
                 fs = new POIFSFileSystem(is);
                 wb = new HSSFWorkbook(fs);
             }
             else{
                 wb=new XSSFWorkbook(is);
             }
         } catch (IOException e) {
             e.printStackTrace();
         }
         sheet = wb.getSheetAt(0);
         row = sheet.getRow(0);
         // 标题总列数
         int colNum = row.getPhysicalNumberOfCells();
         System.out.println("colNum:" + colNum);
         String[] title = new String[colNum];
         for (int i = 0; i < colNum; i++) {
             //title[i] = getStringCellValue(row.getCell((short) i));
             title[i] = getCellFormatValue(row.getCell((short) i));
         }
         return title;
     }

     /**
      * 读取Excel数据内容
      * @param file
      * @return Map 包含单元格数据内容的Map对象
      */
     public Map<Integer, String> readExcelContent(File file) {
         Map<Integer, String> content = new HashMap<Integer, String>();
         String str = "";
         try {
             InputStream is=new FileInputStream(file);
             if(file.getName().toLowerCase().endsWith(".xls")){
                 //fs = new POIFSFileSystem(is);
                 wb = new HSSFWorkbook(is);
             }else{
                 wb=new XSSFWorkbook(is);
             }

         } catch (IOException e) {
             e.printStackTrace();
         }
         sheet = wb.getSheetAt(0);
         // 得到总行数
         int rowNum = sheet.getLastRowNum();
         row = sheet.getRow(0);
         int colNum = row.getPhysicalNumberOfCells();
         // 正文内容应该从第二行开始,第一行为表头的标题
         for (int i = 1; i <= rowNum; i++) {
             row = sheet.getRow(i);
             int j = 0;
             while (j < colNum) {
                 // 每个单元格的数据内容用"-"分割开，以后需要时用String类的replace()方法还原数据
                 // 也可以将每个单元格的数据设置到一个javabean的属性中，此时需要新建一个javabean
                 // str += getStringCellValue(row.getCell((short) j)).trim() +
                 // "-";
                 str += getCellFormatValue(row.getCell((short) j)).trim() + "    ";
                 j++;
             }
             content.put(i, str);
             str = "";
         }
         return content;
     }

     /**
      * 获取单元格数据内容为字符串类型的数据
      *
      * @param cell Excel单元格
      * @return String 单元格数据内容
      */
     private String getStringCellValue(HSSFCell cell) {
         String strCell = "";
         switch (cell.getCellType()) {
             case HSSFCell.CELL_TYPE_STRING:
                 strCell = cell.getStringCellValue();
                 break;
             case HSSFCell.CELL_TYPE_NUMERIC:
                 strCell = String.valueOf(cell.getNumericCellValue());
                 break;
             case HSSFCell.CELL_TYPE_BOOLEAN:
                 strCell = String.valueOf(cell.getBooleanCellValue());
                 break;
             case HSSFCell.CELL_TYPE_BLANK:
                 strCell = "";
                 break;
             default:
                 strCell = "";
                 break;
         }
         if (strCell.equals("") || strCell == null) {
             return "";
         }
         if (cell == null) {
             return "";
         }
         return strCell;
     }

     /**
      * 获取单元格数据内容为日期类型的数据
      *
      * @param cell
      *            Excel单元格
      * @return String 单元格数据内容
      */
     private String getDateCellValue(HSSFCell cell) {
         String result = "";
         try {
             int cellType = cell.getCellType();
             if (cellType == HSSFCell.CELL_TYPE_NUMERIC) {
                 Date date = cell.getDateCellValue();
                 result = (date.getYear() + 1900) + "-" + (date.getMonth() + 1)
                         + "-" + date.getDate();
             } else if (cellType == HSSFCell.CELL_TYPE_STRING) {
                 String date = getStringCellValue(cell);
                 result = date.replaceAll("[年月]", "-").replace("日", "").trim();
             } else if (cellType == HSSFCell.CELL_TYPE_BLANK) {
                 result = "";
             }
         } catch (Exception e) {
             System.out.println("日期格式不正确!");
             e.printStackTrace();
         }
         return result;
     }

     /**
      * 根据HSSFCell类型设置数据
      * @param cell
      * @return
      */
     private String getCellFormatValue(Cell cell) {
         String cellvalue = "";
         if (cell != null) {
             // 判断当前Cell的Type
             switch (cell.getCellType()) {
                 // 如果当前Cell的Type为NUMERIC
                 case HSSFCell.CELL_TYPE_NUMERIC:
                 case HSSFCell.CELL_TYPE_FORMULA: {
                     // 判断当前的cell是否为Date
                     if (HSSFDateUtil.isCellDateFormatted(cell)) {
                         // 如果是Date类型则，转化为Data格式

                         //方法1：这样子的data格式是带时分秒的：2011-10-12 0:00:00
                         //cellvalue = cell.getDateCellValue().toLocaleString();

                         //方法2：这样子的data格式是不带带时分秒的：2011-10-12
                         Date date = cell.getDateCellValue();
                         SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
                         cellvalue = sdf.format(date);

                     }
                     // 如果是纯数字
                     else {
                         // 取得当前Cell的数值
                         cellvalue = String.valueOf(cell.getNumericCellValue());
                     }
                     break;
                 }
                 // 如果当前Cell的Type为STRIN
                 case HSSFCell.CELL_TYPE_STRING:
                     // 取得当前的Cell字符串
                     cellvalue = cell.getRichStringCellValue().getString();
                     break;
                 // 默认的Cell值
                 default:
                     cellvalue = " ";
             }
         } else {
             cellvalue = "";
         }
         return cellvalue;

     }

     public static void main(String[] args) {

         try {

             System.out.println("开始");
             File file=new File("D:\\用户列表测试.xlsx");
             ExcelReader er=new ExcelReader();
             String [] titles=er.readExcelTitle(file);
             for(String title:titles){
                 System.out.println(title);
             }

             Map<Integer,String>   contents= er.readExcelContent(file);
             Set<Integer> contentsKey=contents.keySet();
             for(Integer key:contentsKey){
                 System.out.println("第"+key+"行："+contents.get(key));
             }

         }catch(Exception e){

             e.getMessage();
         }
     }
 }