公共POI导出Excel方法详解

package com.hwt.glmf.common; import java.io.IOException;import java.io.OutputStream;import java.util.ArrayList;import java.util.List; import javax.servlet.http.HttpServletResponse; import org.apache.poi.hssf.usermodel.HSSFCell;import org.apache.poi.hssf.usermodel.HSSFCellStyle;import org.apache.poi.hssf.usermodel.HSSFFont;import org.apache.poi.hssf.usermodel.HSSFRichTextString;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.hssf.util.CellRangeAddress;import org.apache.poi.hssf.util.HSSFColor; /** * 导出Excel公共方法 * @version 1.0 *  * @author wangcp * */public class ExportExcel extends ActionSupport implements ServletRequestAware{		//显示的导出表的标题	private String title;	//导出表的列名	private String[] rowName ;		private List<Object[]> dataList = new ArrayList<Object[]>();		HttpServletResponse response;		//构造方法，传入要导出的数据	public ExportExcel(String title,String[] rowName,List<Object[]> dataList){		this.dataList = dataList;		this.rowName = rowName;		this.title = title;	}				/*	 * 导出数据	 * */	public void export() throws Exception{		try{			HSSFWorkbook workbook = new HSSFWorkbook();						// 创建工作簿对象			HSSFSheet sheet = workbook.createSheet(title);		 			// 创建工作表						// 产生表格标题行	 HSSFRow rowm = sheet.createRow(0);	 HSSFCell cellTiltle = rowm.createCell(0);	 	 //sheet样式定义【getColumnTopStyle()/getStyle()均为自定义方法 - 在下面 - 可扩展】	 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	 	 sheet.addMergedRegion(new CellRangeAddress(0, 1, 0, (rowName.length-1))); 	 cellTiltle.setCellStyle(columnTopStyle);	 cellTiltle.setCellValue(title); 					// 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(columnTopStyle);						//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								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 = currentCell.getStringCellValue().getBytes().length;	   if (columnWidth < length) {	    columnWidth = length;	   }	   }	  }	  }	  if(colNum == 0){	  	sheet.setColumnWidth(colNum, (columnWidth-2) * 256);	  }else{	  	sheet.setColumnWidth(colNum, (columnWidth+4) * 256);	  }	 }						if(workbook !=null){				try			 {			 String fileName = "Excel-" + String.valueOf(System.currentTimeMillis()).substring(4, 13) + ".xls";			 String headStr = "attachment; filename=/"" + fileName + "/"";			 response = getResponse();			 response.setContentType("APPLICATION/OCTET-STREAM");			 response.setHeader("Content-Disposition", headStr);			 OutputStream out = response.getOutputStream();			 workbook.write(out);			 }			 catch (IOException e)			 {			 e.printStackTrace();			 }			} 		}catch(Exception e){			e.printStackTrace();		}			}  /** * 获取response **/ private HttpServletResponse getResponse(){ HttpServletResponse response = ServletActionContext.getResponse();		return response; }		/* 	 * 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("Courier New"); 	 //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; 	  	} 	 	/* 	 * 列数据信息单元格样式	 */  	public HSSFCellStyle getStyle(HSSFWorkbook workbook) {	 	 // 设置字体	 	 HSSFFont font = workbook.createFont();	 	 //设置字体大小	 	 //font.setFontHeightInPoints((short)10);	 	 //字体加粗	 	 //font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);	 	 //设置字体名字 	 	 font.setFontName("Courier New");	 	 //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; 	 	}}

String title = Message.getString("manifestIExportTitle"); 	String[] rowsName = new String[]{"序号","货物运输批次号","提运单号","状态","录入人","录入时间"}; 		List<Object[]> dataList = new ArrayList<Object[]>(); 		Object[] objs = null; 		for (int i = 0; i < manifestIMainList.size(); i++) { 			ManifestIMain man = manifestIMainList.get(i); 			objs = new Object[rowsName.length]; 			objs[0] = i; 			objs[1] = man.getTranNo(); 			objs[2] = man.getBillNo(); 			objs[3] = man.getStatusFlagCnName(); 			objs[4] = man.getLoginName(); 			SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); 			String date = df.format(man.getModiDate()); 			objs[5] = date; 			dataList.add(objs); 		} 		ExportExcel ex = new ExportExcel(title, rowsName, dataList); 		ex.export();