java使用poi导出Excel的方法

package hyss.util.common;import java.io.IOException;import java.io.OutputStream;import java.net.URLEncoder;import java.util.ArrayList;import java.util.List;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.HSSFColor;import org.apache.poi.ss.util.CellRangeAddress;/** * Excel导出工具类 * @author ts */public class ExportExcelUtil { //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 ExportExcelUtil(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);   rowm.setHeightInPoints(25);           //设置标题行默认行高      //sheet样式定义【getColumnTopStyle()/getStyle()均为自定义方法 - 在下面 - 可扩展】   HSSFCellStyle columnTitleStyle = this.getTitleTopStyle(workbook);//获取标题行样式   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(columnTitleStyle);   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)   rowRowName.setHeightInPoints(25);       //将列头设置默认行高   // 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    row.setHeightInPoints(20); //将创建出的行设置默认行高    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 = title + DateTime.getSystemDateTime("yyyy-MM-dd") + ".xls";　　　　　　　　　　　　　//因 response已经封装成工具类所以下面这段代码注释掉//     response =ServletActionContext.getResponse();//     response.setContentType("APPLICATION/OCTET-STREAM");//     response.setHeader("Content-Disposition", headStr);//     OutputStream out = response.getOutputStream();          //解决中文乱码      Struts2Util.getResponse().setCharacterEncoding("UTF-8");     //解决中文乱码     Struts2Util.getResponse().setHeader("Content-Disposition", "attachment;filename*=UTF-8''" + URLEncoder.encode(fileName,"UTF-8"));     //文件下载     Struts2Util.getResponse().setContentType("APPLICATION/OCTET-STREAM");     OutputStream out = Struts2Util.getResponse().getOutputStream();     workbook.write(out);    }    catch (IOException e)    {     e.printStackTrace();    }   }  }catch(Exception e){   e.printStackTrace();  }   }  /*   * 设置标题样式  */   public HSSFCellStyle getTitleTopStyle(HSSFWorkbook workbook) {      // 设置字体   HSSFFont font = workbook.createFont();   //设置字体大小   font.setFontHeightInPoints((short)24);   //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();   //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();   //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("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;    } }

/** 实现方法*/public void exportExcel() throws Exception{  String  String[] rowsName = new String[]{"序号","列头1","列头2","列头3","列头4","列头5"};  List<Object[]> dataList = new ArrayList<Object[]>();  Object[] objs = null;  for (int i = 0; i < 10; i++) {   objs = new Object[rowsName.length];   objs[0] = i;   objs[1] = "测试1";   objs[2] = "测试2";   objs[3] = "测试3";   objs[4] = "测试4";   objs[5] = "测试5";   dataList.add(objs);  }  ExportExcelUtil ex = new ExportExcelUtil(title, rowsName, dataList);  ex.export();   }