POI读取Excel 初步支持对象封装功能

package com.randy;

import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.text.DateFormat;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.beanutils.PropertyUtils;
import org.apache.commons.collections.MapUtils;
import org.apache.commons.lang.ArrayUtils;
import org.apache.commons.lang.BooleanUtils;
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;

public  class ExcelReader {
  
   final SimpleDateFormat format =  new SimpleDateFormat( "yyyy-MM-dd");
  
   private FileInputStream inputStream;
   private HSSFWorkbook workbook;
   private  int sheetIndex;
   /**
    * 开始读取数据行
    */
   private  int startRow =0;
   /**
    * 开始读取数据列
    */
   private  int startColumn=0;
   /**
    * 指定输入流
    * 初始化WorkBook对象
    */
   private  void initWorkbook() {
     if (workbook ==  null) {
       try {
        workbook =  new HSSFWorkbook(inputStream);
      }  catch (IOException e) {
        e.printStackTrace();
      }
    }
  }
   /**
    * 获取所有行
    * @return
    */
   public List<HSSFRow> readHSSFRows(){
    HSSFSheet sheet = workbook.getSheetAt(sheetIndex);
     //实际存在的行数
     int rows = sheet.getPhysicalNumberOfRows();
    List<HSSFRow> hssfRows =  new ArrayList<HSSFRow>();
    
     for ( int count = startRow; count <=rows-1; count++) {
      HSSFRow row = sheet.getRow(count);
       if(row != null){
        hssfRows.add(row);
      }
    }
     return hssfRows;
  }
   /**
    * 读取行数据
    * @param hssfRow
    * @return
    */
   public String[] readCellsValue(HSSFRow hssfRow){
    
     int cells = hssfRow.getPhysicalNumberOfCells(); //列数
    System.out.println( "\nROW " + hssfRow.getRowNum() +  " has " + cells
        +  " cell(s).");
    String[] cellValues =  new String[cells];
     for ( int counter = startColumn; counter < cells; counter++) {
      HSSFCell cell = hssfRow.getCell(counter);
      String value =  null;
       switch (cell.getCellType()) {
         case HSSFCell.CELL_TYPE_FORMULA:
          value = cell.getCellFormula();
           break;
         case HSSFCell.CELL_TYPE_NUMERIC:
          value = String.valueOf(cell.getNumericCellValue());
                                         if (HSSFDateUtil.isCellDateFormatted(cell)) {
                                                Date date = cell.getDateCellValue();
                                                 if (date !=  null) {
              value = format.format(date);
                                                }  else {
                                                        value = "";
                                                }
                                        }  else {
                                                value =  new DecimalFormat( "0").format(cell.getNumericCellValue());
                                        }
          
           break;
         case HSSFCell.CELL_TYPE_STRING:
          value = cell.getStringCellValue();
           break;
         default:
          value = "9999";
      }
      cellValues[counter] = value;
    } //end for
     return cellValues;
  }
  
  
   /**
    * 
    * 根据传入的Map;将cell的数值依次对应赋值给对象属性
    * @param propertiesMap:格式為[-1:class,0:filedname1;1:filedname2.....]
    * 其中：0代表第0个cell;1代表第1个cell
    * @param cells
    * @return
    */
  @SuppressWarnings( "unchecked")
   public Object genVOFromCells(Map<Integer,String> propertiesMap,String cells[]){
     //存放对象属性描述信息
    Map<String,PropertyDescriptor> propMap =  new HashMap<String,PropertyDescriptor>();
    Object obj =  null;
    String className = propertiesMap.get(-1);
    Map properDesc =  null;
     try {
      Class cls = Class.forName(className);
      obj = cls.newInstance();
       //获取对象的描述信息
      BeanInfo bi = Introspector.getBeanInfo(cls);
      PropertyDescriptor[] pds = bi.getPropertyDescriptors();
       for(PropertyDescriptor p:pds){
        propMap.put(p.getName(), p);
      }      
      properDesc = BeanUtils.describe(obj);
      Set<Integer> keys = propertiesMap.keySet();
      Iterator<Integer> iter = keys.iterator();
       while(iter.hasNext()){
        Integer index = iter.next();
         if(index.intValue() == -1){ continue;}
        String property = propertiesMap.get(index);
         if(properDesc.containsKey(property)){
           //获取对象类型
          Class<?> propertyType = propMap.get(property).getPropertyType();
          System.out.println(property+ ".class:"+propertyType);
          String value = cells[index];
           if(String. class.equals(propertyType)){
            PropertyUtils.setProperty(obj, property, value);
          } else  if(Date. class.equals(propertyType)){
            Date d;
             try {
              d = format.parse(value);
            }  catch (Exception e) {
              d =  new Date();
            }
            PropertyUtils.setProperty(obj,property,d);
          } else  if( int. class.equals(propertyType)|| Integer. class.equals(propertyType)){
             int i = 0; 
             try{
              i = Integer.parseInt(value);
            } catch (NumberFormatException e) {
              i = 0;
            }
            PropertyUtils.setProperty(obj,property,i);
          } else  if( double. class.equals(propertyType) || Double. class.equals(propertyType)){
             double d = 0; 
             try{
              d = Double.parseDouble(value);
            } catch (NumberFormatException e) {
              d = 0.0;
            }
            PropertyUtils.setProperty(obj,property,d);            
          } else  if( long. class.equals(propertyType) || Long. class.equals(propertyType)){
             long l = 0; 
             try{
              l = Long.parseLong(value);
            } catch (NumberFormatException e) {
              l = 0l;
            }
            PropertyUtils.setProperty(obj,property,l);            
          } else  if( float. class.equals(propertyType) || Float. class.equals(propertyType)){
             float f = 0; 
             try{
              f = Float.parseFloat(value);
            } catch (NumberFormatException e) {
              f = 0l;
            }
            PropertyUtils.setProperty(obj,property,f);            
          } else{ //boolean
            Boolean b = BooleanUtils.toBooleanObject(value);
            PropertyUtils.setProperty(obj,property,b);
          }
        }
      }
    }  catch (Exception e) {
      e.printStackTrace();
    }
     return obj;
  }
   /**
    * 设置输入流；
    * 必须为Excel指定输入流
    * @param inputStream
    */
   public  void setInputStream(FileInputStream inputStream) {
     this.inputStream = inputStream;
    initWorkbook();
  }
   /**
    * 设置读取sheet
    * @param sheetIndex
    */
   public  void setSheetIndex( int sheetIndex) {
     this.sheetIndex = sheetIndex;
  }
   /**
    * 设置读取数据起始行
    * 默认从0开始
    * @param startRow
    */
   public  void setStartRow( int startRow) {
     this.startRow = startRow;
  }
   /**
    * 设置行数据，读取数据起始列
    * 默认从0开始
    * @param startColumn
    */
   public  void setStartColumn( int startColumn) {
     this.startColumn = startColumn;
  }
   public  static  void main(String args[]){
    
    Map<Integer,String> propertiesMap =  new HashMap<Integer,String>();
    propertiesMap.put(-1,  "com.randy.VO");
    propertiesMap.put(0,  "num");
    propertiesMap.put(1,  "str");
    propertiesMap.put(2,  "date");
    
    ExcelReader reader =  new ExcelReader();
    FileInputStream excelFile =  null;
     try {
      excelFile =  new FileInputStream( "F:\\workbook.xls");
    }  catch (FileNotFoundException e) {
      e.printStackTrace();
    }
    reader.setInputStream(excelFile);
    List<HSSFRow> rows = reader.readHSSFRows();
     for(HSSFRow row:rows){
      String[] values = reader.readCellsValue(row);
       for(String v:values){
        System.out.print(v+ "\t");
      }
      System.out.println();
      Object obj = reader.genVOFromCells(propertiesMap,values);
      System.out.println(obj);
    }
    

    
  }
}