Excel工具

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import  java.io.FileNotFoundException;
import  java.io.FileOutputStream;
import  java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.sql.Date;
import  java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.List;

import  org.apache.poi.hssf.usermodel.HSSFCell;
import  org.apache.poi.hssf.usermodel.HSSFCellStyle;
import  org.apache.poi.hssf.usermodel.HSSFDataFormat;
import  org.apache.poi.hssf.usermodel.HSSFRow;
import  org.apache.poi.hssf.usermodel.HSSFSheet;
import  org.apache.poi.hssf.usermodel.HSSFWorkbook;
public class XLSExport {
   //  定制日期格式
    private   static  String DATE_FORMAT  =   "m/d/yy h:mm" ;  //  "m/d/yy h:mm"
   //  定制浮点数格式
   private   static  String NUMBER_FORMAT  =   " #,##0.00 " ;
   private  String xlsFileName;
   private  HSSFWorkbook workbook;
   private  HSSFSheet sheet;
   private  HSSFRow row;
   public  XLSExport()  {
       this .workbook  =   new  HSSFWorkbook();
       this .sheet  =  workbook.createSheet();
  }
   /**
   * 初始化Excel
   *  @param  fileName
   *            导出文件名
    */
    public  XLSExport(String fileName)  {
       this .xlsFileName  =  fileName;
       this .workbook  =   new  HSSFWorkbook();
       this .sheet  =  workbook.createSheet();
  }
    /**
     * 导出Excel文件
     *  @throws  XLSException
      */
      public   void  exportXLS()  throws  XLSException  {
         try   {
            FileOutputStream fOut  =   new  FileOutputStream(xlsFileName);
            workbook.write(fOut);
            fOut.flush();
            fOut.close();
        }   catch  (FileNotFoundException e)  {
             throw   new  XLSException("生成导出Excel文件出错! " );
        }   catch  (IOException e)  {
             throw   new  XLSException("写入Excel文件出错! ");
        }
    }
      /**
       * 导出 excel  能够穿 response.getOutputStream
       * @param os
       * @throws XLSException
       */
      public   void  exportXLS(OutputStream os)  throws  XLSException  {
          try   {
             workbook.write(os);
             os.flush();
             os.close();
         }   catch  (FileNotFoundException e)  {
              throw   new  XLSException("生成导出Excel文件出错! " );
         }   catch  (IOException e)  {
              throw   new  XLSException("写入Excel文件出错! ");
         }
     }
      /**
       * 使用ByteArrayOutputStream  
       * 将 Workbook内容写到此输出流  再经过toByteArray方法获取数据源 
       * 再  new ByteArrayInputStream();
       * @return
       */
      public InputStream  getExcelInputStream(){
    	  ByteArrayOutputStream bos = new ByteArrayOutputStream();
    	  try {
			workbook.write(bos);
		} catch (IOException e) {
			e.printStackTrace();
		}
  		  return new ByteArrayInputStream(bos.toByteArray());
      }
    /**
   * 增长一行
   *  @param  index
   *            行号
    */
   public   void  createRow( int  index)  {
       this .row  =   this .sheet.createRow(index);
  }
   /**
    * 建立表头
    * @param index
    * @param headName
    */
   public void createTableHead(int  index,String...headName){
	   createRow(index);
	   //添加表头信息
	   for(int i = 0;i<headName.length;i++){
		   setCell(i,headName[i]);
	   }
   }
   /**
    * 根据传进来的集合  生成excel
    * @param list
    * @param flag  :true  表明有表头  false 没有
    */
   public void createExcelByList(List  list,boolean flag){
	   for(int i = 0;i<list.size();i++){
		   //建立行
		   createRow(flag?i+1:i);
		   //获取对象及反射对象
		   Object obj = list.get(i);
		   Class c = obj.getClass();
		   //获取全部属性
		   Field[] fieldArray = c.getDeclaredFields();
		   //遍历全部属性
		   try {
			for(int j = 0;j<fieldArray.length;j++){
				   //获取属性对应的值
				   String getter = GetNameUtil.getGetter(fieldArray[j]);
				   Method m = c.getDeclaredMethod(getter);
				   Object value = m.invoke(obj);
				   if(value != null){
					   Class type = fieldArray[j].getType();//获取属性类型
					   if(type==Integer.class||type==int.class){
						   setCell(j, (Integer)value);
					   }else if(type==Double.class||type==double.class){
						   setCell(j, (Double)value);
					   }else if(type==Date.class){//java.sql.Date日期处理
						   Date d = (Date)value;
						   GregorianCalendar gc = new GregorianCalendar();
						   gc.setTime(d);
						   setCell(j, gc);
					   }else if(type==String.class){
						   setCell(j, (String)value);
					   }
				   }
			   }
		} catch (Exception e) {
			e.printStackTrace();
		}
	   }
   }
    /**
   * 设置单元格
   *  @param  index
   *            列号
   *  @param  value
   *            单元格填充值
    */
    public   void  setCell( int  index, String value)  {
      HSSFCell cell  =   this .row.createCell(index);
      cell.setCellType(HSSFCell.CELL_TYPE_STRING);
      cell.setCellValue(value);
  }

    /**
   * 设置单元格
   *  @param  index
   *            列号
   *  @param  value
   *            单元格填充值
    */
    public   void  setCell( int  index, Calendar value)  {
      HSSFCell cell  =   this .row.createCell(index);
      cell.setCellValue(value.getTime());
      HSSFCellStyle cellStyle  =  workbook.createCellStyle();  //  创建新的cell样式
       cellStyle.setDataFormat(HSSFDataFormat.getBuiltinFormat(DATE_FORMAT));  //  设置cell样式为定制的日期格式
       cell.setCellStyle(cellStyle);  //  设置该cell日期的显示格式
      sheet.setColumnWidth(index, 10000);
   }

    /**
   * 设置单元格
   *  @param  index
   *            列号
   *  @param  value
   *            单元格填充值
    */
    public   void  setCell( int  index,  int  value)  {
    	
      HSSFCell cell  =   this .row.createCell(index);
      cell.setCellType(HSSFCell.CELL_TYPE_NUMERIC);
      cell.setCellValue(value);
  }

    /**
   * 设置单元格
   *  @param  index
   *            列号
   *  @param  value
   *            单元格填充值
    */
    public   void  setCell( int  index,  double  value)  {
      HSSFCell cell  =   this .row.createCell(index);
      cell.setCellType(HSSFCell.CELL_TYPE_NUMERIC);
      cell.setCellValue(value);
      HSSFCellStyle cellStyle  =  workbook.createCellStyle();  //  创建新的cell样式
       HSSFDataFormat format  =  workbook.createDataFormat();
      cellStyle.setDataFormat(format.getFormat(NUMBER_FORMAT));  //  设置cell样式为定制的浮点数格式
       cell.setCellStyle(cellStyle);  //  设置该cell浮点数的显示格式
   }
	public String getXlsFileName() {
		return xlsFileName;
	}
	public void setXlsFileName(String xlsFileName) {
		this.xlsFileName = xlsFileName;
	}
	public HSSFWorkbook getWorkbook() {
		return workbook;
	}
	public void setWorkbook(HSSFWorkbook workbook) {
		this.workbook = workbook;
	}
	public HSSFSheet getSheet() {
		return sheet;
	}
	public void setSheet(HSSFSheet sheet) {
		this.sheet = sheet;
	}
	public HSSFRow getRow() {
		return row;
	}
	public void setRow(HSSFRow row) {
		this.row = row;
	}
    
}