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();