java 导入到EXCEL表格

package com.fh.util;
import java.util.Date;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
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.ss.usermodel.HorizontalAlignment;
import org.apache.poi.ss.usermodel.VerticalAlignment;
import org.apache.poi.ss.usermodel.Workbook;
import org.springframework.web.servlet.view.document.AbstractXlsView;
import com.fh.util.PageData;
import com.fh.util.Tools;
/**
 * 说明：导入到EXCEL
 * 作者：FH Admin
 * from：fhadmin.cn
 */
public class ObjectExcelView extends AbstractXlsView{
  @Override
  protected void buildExcelDocument(Map<String, Object> model,
      Workbook workbook, HttpServletRequest request,
      HttpServletResponse response) throws Exception {
    // TODO Auto-generated method stub
    Date date = new Date();
    String filename = Tools.date2Str(date, "yyyyMMddHHmmss");
    HSSFSheet sheet;
    response.setContentType("application/octet-stream");
    response.setHeader("Content-Disposition", "attachment;filename="+filename+".xls");
    HSSFWorkbook book = (HSSFWorkbook) workbook;
    sheet = book.createSheet("sheet1");
    List<String> titles = (List<String>) model.get("titles");
    int len = titles.size();
    HSSFCellStyle headerStyle = book.createCellStyle(); //标题样式
    headerStyle.setAlignment(HorizontalAlignment.CENTER);
    headerStyle.setVerticalAlignment(VerticalAlignment.CENTER);
    HSSFFont headerFont = book.createFont();      //标题字体
    headerFont.setBold(true);
    headerFont.setFontHeightInPoints((short)11);
    headerStyle.setFont(headerFont);
    short height=25*20;
    HSSFRow row = sheet.createRow(0);
    for(int i=0; i<len; i++){ //设置标题
      String title = titles.get(i);
      row.setRowStyle(headerStyle);
      row.createCell(i).setCellValue(title);  
    }
    sheet.getRow(0).setHeight(height);
    HSSFCellStyle contentStyle = book.createCellStyle(); //内容样式
    contentStyle.setAlignment(HorizontalAlignment.CENTER);
    List<PageData> varList = (List<PageData>) model.get("varList");
    int varCount = varList.size();
    for(int i=0; i<varCount; i++){
      PageData vpd = varList.get(i);
      HSSFRow rows = sheet.createRow(i+1); 
      for(int j=0;j<len;j++){
        String varstr = vpd.getString("var"+(j+1)) != null ? vpd.getString("var"+(j+1)) : "";
        rows.setRowStyle(contentStyle);
        rows.createCell(j).setCellValue(varstr);
      }
    }
  }
}