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 title = "测试";
  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();
  
 }