java导出包含多个sheet的Excel数据

要导出多个sheet，关键就是Excel导出的时间设定，在执行导出文件之前，创建多个工作表

HSSFSheet sheet = workbook.createSheet(sheettitle); 

这样每创建一个工作表，便会生成一个新的sheet表，在最后导出Excel的时候一次性导出。

Java类：

try { 
  HSSFWorkbook workbook = new HSSFWorkbook(); 
  OutputStream out = response.getOutputStream(); 
  for(int j=0;j<n;j++){ 
    BaseResult<List<T>> teasalList = service.select(teasal); 
    //接下来循环list放到Excel表中 
    if(teasalList.isSuccess()&&teasalList.getResult().size()>0){ 
      //文件标题 
      SimpleDateFormat formatter1 = new SimpleDateFormat("yyyy-MM-dd"); 
      String nowdate = formatter1.format(new Date()); 
      String title = null; 
      title = "excel表格标题-" + nowdate + ".xls"; 
      String sheettitle = "sheet表名"; 
      //设置表格标题行 
      String oneheaders = "首行标题" ; 
      String dateheaders = nowdate ; 
      String[] headers = new String[] {"列1","列2","列3","列4"}; 
      List<Object[]> dataList = new ArrayList<Object[]>(); 
      Object[] objs = null; 
      for(int i =0; i<3 ; i++){ //循环每一条数据 
        objs = new Object[headers.length]; 
        objs[1] = "张三";  //姓名 
        objs[2] = "3"; //序号 
        //数据添加到excel表格 
        dataList.add(objs); 
      } 
      //使用流将数据导出 
      //防止中文乱码 
      String headStr = "attachment; filename=\"" + new String( title.getBytes("gb2312"), "ISO8859-1" ) + "\""; 
      response.setContentType("octets/stream"); 
      response.setContentType("APPLICATION/OCTET-STREAM"); 
      response.setHeader("Content-Disposition", headStr); 
      ExportExcelDownFee ex ; 
      ex = new ExportExcelDownFee(sheettitle, oneheaders, dateheaders,headers, dataList);//没有标题 
      ex.export(workbook,out); 
    } 
  } 
  workbook.write(out); //循环生成多个sheet之后在导出Excel
  out.close(); //关闭流
} catch (Exception e) { 
  e.printStackTrace(); 
}

工具类：

public class ExportExcelDownFee { 
 
  //导出表的列名 
  private String[] rowName ; 
  //导出表的小标题 
  private String oneheaders; 
  //导出表的日期 
  private String dateheaders; 
  //sheet表表名 
  private String sheettitle; 
 
  private List<Object[]> dataList = new ArrayList<Object[]>(); 
 
  HttpServletResponse response; 
   
  //构造方法2，传入要导出的数据 
  public ExportExcelDownFee( String sheettitle, String oneheaders, String dateheaders, String[] rowName,List<Object[]> dataList){ 
    this.dataList = dataList; 
    this.oneheaders = oneheaders; 
    this.dateheaders = dateheaders; 
    this.rowName = rowName; 
    this.sheettitle = sheettitle; 
  } 
   
  /* 
   * 导出数据 
   * */ 
  public void export(HSSFWorkbook workbook,OutputStream out) throws Exception{ 
    try{ 
      HSSFSheet sheet = workbook.createSheet(sheettitle);         // 创建工作表 
 
      HSSFCellStyle columnTopStyle = this.getColumnTopStyle(workbook);//获取列头样式对象 
      HSSFCellStyle style = this.getStyle(workbook);         //单元格样式对象 
 
      //第一行 
      HSSFRow rowfirstName = sheet.createRow(0); 
      HSSFCell oneCellRowName = rowfirstName.createCell(0);        //创建列头对应个数的单元格 
      oneCellRowName.setCellType(HSSFCell.CELL_TYPE_STRING);       //设置列头单元格的数据类型 
      HSSFRichTextString onetext = new HSSFRichTextString(oneheaders); 
      oneCellRowName.setCellValue(onetext);                 //设置列头单元格的值 
      //合并单元格CellRangeAddress构造参数依次表示起始行，截至行，起始列， 截至列  
      sheet.addMergedRegion(new CellRangeAddress(0,0,0,3));  
      oneCellRowName.setCellStyle(columnTopStyle);            //设置列头单元格样式 
       
      //第二行 
      HSSFRow rowDateName = sheet.createRow(1); 
      HSSFCell DateCellRowName = rowDateName.createCell(3); 
      DateCellRowName.setCellValue(dateheaders); 
      DateCellRowName.setCellStyle(columnTopStyle);  
       
      // 定义所需列数 
      int columnNum = rowName.length; 
      HSSFRow rowRowName = sheet.createRow(2);        // 在索引2的位置创建行(最顶端的行开始的第二行) 
 
      // 将列头设置到sheet的单元格中 
      for(int n=0;n<columnNum;n++){ 
        HSSFCell cellRowName = rowRowName.createCell(n);        //创建列头对应个数的单元格 
        cellRowName.setCellType(HSSFCell.CELL_TYPE_STRING);       //设置列头单元格的数据类型 
        HSSFRichTextString text = new HSSFRichTextString(rowName[n]); 
        cellRowName.setCellValue(text);                 //设置列头单元格的值 
        cellRowName.setCellStyle(style);            //设置列头单元格样式 
      } 
 
      //将查询出的数据设置到sheet对应的单元格中 
      for(int i=0;i<dataList.size();i++){ 
 
        Object[] obj = dataList.get(i);//遍历每个对象 
        HSSFRow row = sheet.createRow(i+3);//创建所需的行数（从第二行开始写数据） 
 
        for(int j=0; j<obj.length; j++){ 
          HSSFCell cell = null;  //设置单元格的数据类型 
          if(j == 0){ 
            cell = row.createCell(j,HSSFCell.CELL_TYPE_NUMERIC); 
            cell.setCellValue(i+1);  
          }else{ 
            cell = row.createCell(j,HSSFCell.CELL_TYPE_STRING); 
            if(!"".equals(obj[j]) && obj[j] != null){ 
              cell.setCellValue(obj[j].toString());            //设置单元格的值 
            } 
          } 
          cell.setCellStyle(style);                  //设置单元格样式 
        } 
      } 
       
      //让列宽随着导出的列长自动适应 
      for (int colNum = 0; colNum < columnNum; colNum++) { 
        int columnWidth = sheet.getColumnWidth(colNum) / 256; 
        for (int rowNum = 0; rowNum < sheet.getLastRowNum(); rowNum++) { 
          HSSFRow currentRow; 
          //当前行未被使用过 
          if (sheet.getRow(rowNum) == null) { 
            currentRow = sheet.createRow(rowNum); 
          } else { 
            currentRow = sheet.getRow(rowNum); 
          } 
          if (currentRow.getCell(colNum) != null) { 
            HSSFCell currentCell = currentRow.getCell(colNum); 
            if (currentCell.getCellType() == HSSFCell.CELL_TYPE_STRING) { 
              int length = 0; 
              try { 
                length = currentCell.getStringCellValue().getBytes().length; 
              } catch (Exception e) { 
                e.printStackTrace(); 
              } 
              if (columnWidth < length) { 
                columnWidth = length; 
              } 
            } 
          } 
 
        } 
        if(colNum == 0){ 
          sheet.setColumnWidth(colNum, (columnWidth-2) * 256); 
        }else{ 
          sheet.setColumnWidth(colNum, (columnWidth+4) * 256); 
        } 
      } 
 
    }catch(Exception e){ 
      e.printStackTrace(); 
    } 
  } 
 
  /* 
   * 列头单元格样式 
   */   
  public HSSFCellStyle getColumnTopStyle(HSSFWorkbook workbook) { 
 
     // 设置字体 
     HSSFFont font = workbook.createFont(); 
     //设置字体大小 
     font.setFontHeightInPoints((short)11); 
     //字体加粗 
     //font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); 
     //设置字体名字  
     font.setFontName("宋体"); 
     //设置样式;  
     HSSFCellStyle style = workbook.createCellStyle(); 
     //在样式用应用设置的字体;  
     style.setFont(font); 
     //设置自动换行;  
     style.setWrapText(false); 
     //设置水平对齐的样式为居中对齐;  
     style.setAlignment(HSSFCellStyle.ALIGN_CENTER); 
     //设置垂直对齐的样式为居中对齐;  
     style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); 
 
     return style; 
 
  } 
 
  /*  
   * 列数据信息单元格样式 
   */  
  public HSSFCellStyle getStyle(HSSFWorkbook workbook) { 
     // 设置字体 
     HSSFFont font = workbook.createFont(); 
     //设置字体名字  
     font.setFontName("宋体"); 
     //设置样式;  
     HSSFCellStyle style = workbook.createCellStyle(); 
     //设置底边框;  
     style.setBorderBottom(HSSFCellStyle.BORDER_THIN); 
     //设置底边框颜色;  
     style.setBottomBorderColor(HSSFColor.BLACK.index); 
     //设置左边框;   
     style.setBorderLeft(HSSFCellStyle.BORDER_THIN); 
     //设置左边框颜色;  
     style.setLeftBorderColor(HSSFColor.BLACK.index); 
     //设置右边框;  
     style.setBorderRight(HSSFCellStyle.BORDER_THIN); 
     //设置右边框颜色;  
     style.setRightBorderColor(HSSFColor.BLACK.index); 
     //设置顶边框;  
     style.setBorderTop(HSSFCellStyle.BORDER_THIN); 
     //设置顶边框颜色;  
     style.setTopBorderColor(HSSFColor.BLACK.index); 
     //在样式用应用设置的字体;  
     style.setFont(font); 
     //设置自动换行;  
     style.setWrapText(false); 
     //设置水平对齐的样式为居中对齐;  
     style.setAlignment(HSSFCellStyle.ALIGN_CENTER); 
     //设置垂直对齐的样式为居中对齐;  
     style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); 
 
     return style; 
 
   } 
}