JavaBean生成excel

package com.xls;

import java.beans.IntrospectionException;
import java.beans.PropertyDescriptor;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.List;

import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFColor;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class DealxlsImpl {
	
	
	/**@author johngf
	 *  传入一个list，将其写入指定的excel文件*/

	public boolean generateXls(List<?> objs,File file) 
	{
		if(objs.size()<=0)
		{
			return false;	
		}else if(!file.exists())
		{
			try {
				file.createNewFile();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}else if(file.exists())
		{
			file.delete();
			try {
				file.createNewFile();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		
		  //Create Blank workbook
		Class<?> clazz = objs.get(0).getClass();
	      XSSFWorkbook workbook = new XSSFWorkbook(); 
	      int number = objs.size()/104857 + 1 ;
	      System.out.println("需要工作表的个数是"+number);
	      for(int i=0;i<number;i++)
	      {
	    	  XSSFSheet sheet = workbook.createSheet("sheet"+i);  
	    	  Field[] fields = objs.get(0).getClass().getDeclaredFields();
	    	  System.out.println("列数是 "+fields.length);
	    	 // String[] titles = getTitle(objs.get(0));
	    	  //写标题行
	    	  Row row = sheet.createRow(0);
	    	  XSSFCellStyle style = workbook.createCellStyle();
	    	  style.setFillBackgroundColor(new XSSFColor(new byte[]{100,25,13}));
	    	  for(int j =0 ;j<fields.length;j++)
	    	  {
	    		  Cell c = row.createCell(j);
	    		  c.setCellValue(fields[j].getName());
	    		  c.setCellStyle(style);
	    	  }
	    	  //标题已经写入
	    	  
	    	 System.out.println("i="+i+"对象数"+ objs.size());
	    	 System.out.println(objs.size()-(104587 * i ));
	    	  for(int m = 104587 * i ;m < objs.size()-(104587 * i ); m++)
	    	  { 
	    		 row = sheet.createRow( m + 1 );
	    		 System.out.println("已创建行 "+(m+1));
	    		 for(int n =0 ;n < fields.length;n++)
	    		 {
	    			 try {
						PropertyDescriptor pd = new PropertyDescriptor(
								fields[n].getName(), clazz);
						Method method = pd.getReadMethod();
						row.createCell(n).setCellValue(method.invoke(objs.get(m), null).toString());
						
					} catch (IntrospectionException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					} catch (IllegalAccessException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					} catch (IllegalArgumentException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					} catch (InvocationTargetException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
	    			
	    			 
	    		 }
	    		  
	    	 } 
	    	  
	      }
	      
	      
	      
	      //Create file system using specific name
	      FileOutputStream out;
		try {
			out = new FileOutputStream(file);
			workbook.write(out);
			workbook.close();
		    out.close();
		    
			
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	      //write operation workbook using file out object 
 catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	      
	     
		
		
		
	
		return false;
	}

	public boolean parseXls(File file) {
		// TODO Auto-generated method stub
		return false;
	}


	


	

}