多sheet导出核心代码

package com.jeecg.excelout;
import java.io.File;
import java.io.FileInputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

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.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.hssf.util.Region;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;

    /**
     * 报表导出工具类
     * 
     * @author xuebls
     本工具是根据POI对Excel2003进行报表导出 本工具类可根据模板进行Excel的导出
     *  并且可根据提供的模板Sheet页进行复制 从而实现多个Sheet页的需求
     *  使用本工具类时,如果需求是每个Sheet页中的数据都不一致,但是表格样式和模板都一样
     *  那么只需要在实际情况中根据 sql 来查询要添加的数据源 (只需更改数据源即可)
     */
    public class ExcelUtil {
     /**
      * 根据模板导出报表，可导出多个Sheet页
      * 
      * @param 导出的Excel文件名
      * @param 模板路径 (全路径)
      * @param 数据源
      * @param 返回请求
      * @param 生成的Sheet页的名称集合
      * @param 数据源中Map集合的key值 (key值对应的value值顺序要列名顺序一致)
      * @param 开始 循环写入数据 的行数(从第几行开始写入数据)
      */
     public static void ExcelByModel(String ExcelName, String ModelURl, List<Map<String, String>> dataSource, 
       HttpServletResponse response, String[] sheetNames, String[] keyNames, int rowNum) throws Exception {
      // 设置导出Excel报表的导出形式
      response.setContentType("application/vnd.ms-excel");
      // 设置导出Excel报表的响应文件名
      String fileName = new String(ExcelName.getBytes("utf-8"), "ISO-8859-1");
      response.setHeader("Content-disposition", "attachment;filename=" + fileName + ".xls");
      // 创建一个输出流
      OutputStream fileOut = response.getOutputStream();
      // 读取模板文件路径
      File file = new File(ModelURl);
      FileInputStream fins = new FileInputStream(file);
      POIFSFileSystem fs = new POIFSFileSystem(fins);
      // 读取Excel模板
      HSSFWorkbook wb = new HSSFWorkbook(fs);
      // 设置边框样式
      HSSFCellStyle style = wb.createCellStyle();
      style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
      style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
      style.setBorderRight(HSSFCellStyle.BORDER_THIN);
      style.setBorderTop(HSSFCellStyle.BORDER_THIN);
      // 设置边框样式的颜色
      style.setBottomBorderColor(HSSFColor.BLACK.index);
      style.setLeftBorderColor(HSSFColor.BLACK.index);
      style.setRightBorderColor(HSSFColor.BLACK.index);
      style.setTopBorderColor(HSSFColor.BLACK.index);
      // 模板页
      HSSFSheet sheetModel = null;
      // 新建的Sheet页
      HSSFSheet newSheet = null;
      // 创建行
      HSSFRow row = null;
      // 创建列
      HSSFCell cell = null;
      // 循环建立Sheet页
      for (int i = 0; i < sheetNames.length; i++) {
       // 读取模板中模板Sheet页中的内容
       sheetModel = wb.getSheetAt(0);
       // 设置新建Sheet的页名
       newSheet = wb.createSheet(sheetNames[i]);
       // 将模板中的内容复制到新建的Sheet页中
       copySheet(wb, sheetModel, newSheet, sheetModel.getFirstRowNum(), sheetModel.getLastRowNum());
       //获取到新建Sheet页中的第一行为其中的列赋值
       row=newSheet.getRow(0);
       row.getCell(1).setCellValue("这是为表代码赋的值");
       //注意 合并的单元格也要按照合并前的格数来算
       row.getCell(6).setCellValue("这是为外部代码赋的值");
       //获取模板中的第二列，并赋值
       row=newSheet.getRow(1);
       row.getCell(1).setCellValue("表名称赋值");
       //注意 合并的单元格也要按照合并前的格数来算
       row.getCell(6).setCellValue("这是为是否系统表赋的值");
       // 遍历数据源 开始写入数据(因为Excel中是从0开始,所以减一)
       int num = rowNum - 1;
       for (Map<String, String> item : dataSource) {
        // 循环遍历,新建行
        row = newSheet.createRow((short) num);
        //判断有多少列数据
        for (int j = 0; j < keyNames.length; j++) {
         // 设置每列的数据   设置每列的样式   设置每列的值
         cell = row.createCell(j); cell.setCellStyle(style); cell.setCellValue(item.get(keyNames[j]));
        }
        num++;
       }
       // break 加break可以测试只添加一个Sheet页的情况
      }
      // 写入流
      wb.write(fileOut);
      // 关闭流
      fileOut.close();
     }
     /**
      * 
      * @param Excel工作簿对象
      * @param 模板Sheet页
      * @param 新建Sheet页
      * @param 模板页的第一行
      * @param 模板页的最后一行
      */
     private static void copySheet(HSSFWorkbook wb, HSSFSheet fromsheet, HSSFSheet newSheet, int firstrow, int lasttrow) {
      // 复制一个单元格样式到新建单元格
      if ((firstrow == -1) || (lasttrow == -1) || lasttrow < firstrow) {
       return;
      }
      // 复制合并的单元格
      Region region = null;
      for (int i = 0; i < fromsheet.getNumMergedRegions(); i++) {
       region = fromsheet.getMergedRegionAt(i);
       if ((region.getRowFrom() >= firstrow) && (region.getRowTo() <= lasttrow)) {
        newSheet.addMergedRegion(region);
       }
      }
      HSSFRow fromRow = null;
      HSSFRow newRow = null;
      HSSFCell newCell = null;
      HSSFCell fromCell = null;
      // 设置列宽
      for (int i = firstrow; i < lasttrow; i++) {
       fromRow = fromsheet.getRow(i);
       if (fromRow != null) {
        for (int j = fromRow.getLastCellNum(); j >= fromRow.getFirstCellNum(); j--) {
         int colnum = fromsheet.getColumnWidth((short) j);
         if (colnum > 100) {
          newSheet.setColumnWidth((short) j, (short) colnum);
         }
         if (colnum == 0) {
          newSheet.setColumnHidden((short) j, true);
         } else {
          newSheet.setColumnHidden((short) j, false);
         }
        }
        break;
       }
      }
      // 复制行并填充数据
      for (int i = 0; i < lasttrow; i++) {
       fromRow = fromsheet.getRow(i);
       if (fromRow == null) {
        continue;
       }
       newRow = newSheet.createRow(i - firstrow);
       newRow.setHeight(fromRow.getHeight());
       for (int j = fromRow.getFirstCellNum(); j < fromRow.getPhysicalNumberOfCells(); j++) {
        fromCell = fromRow.getCell((short) j);
        if (fromCell == null) {
         continue;
        }
        newCell = newRow.createCell((short) j);
        newCell.setCellStyle(fromCell.getCellStyle());
        int cType = fromCell.getCellType();
        newCell.setCellType(cType);
        switch (cType) {
         case HSSFCell.CELL_TYPE_STRING:
          newCell.setCellValue(fromCell.getRichStringCellValue());
          break;
         case HSSFCell.CELL_TYPE_NUMERIC:
          newCell.setCellValue(fromCell.getNumericCellValue());
          break;
         case HSSFCell.CELL_TYPE_FORMULA:
          newCell.setCellValue(fromCell.getCellFormula());
          break;
         case HSSFCell.CELL_TYPE_BOOLEAN:
          newCell.setCellValue(fromCell.getBooleanCellValue());
          break;
         case HSSFCell.CELL_TYPE_ERROR:
          newCell.setCellValue(fromCell.getErrorCellValue());
          break;
         default:
          newCell.setCellValue(fromCell.getRichStringCellValue());
          break;
        }
       }
      }
     }
     
     /**
      * 测试多Sheet页导出数据表格方法
      */
     public static void ExcelTest(HttpServletResponse response){
      //构建数据源
      List<Map<String, String>> dataSourceList=new ArrayList<Map<String,String>>(){
       {
        add(new HashMap<String, String>(){{
         put("字段编号", "1");
         put("字段代码", "BUSINESS_ID");
         put("字段含义", "业务id");
         put("数据类型", "VARCHAR");
         put("长度", "64");
         put("主键", "是");
         put("主码", "");
        }});
        add(new HashMap<String, String>(){{
         put("字段编号", "2");
         put("字段代码", "PROC_INST_ID");
         put("字段含义", "流程实例编号");
         put("数据类型", "VARCHAR");
         put("长度", "64");
         put("主键", "");
         put("主码", " ");
        }});
        add(new HashMap<String, String>(){{
         put("字段编号", "3");
         put("字段代码", "PROC_STATE");
         put("字段含义", "流程状态");
         put("数据类型", "VARCHAR");
         put("长度", "64");
         put("主键", " ");
         put("主码", " ");
        }});
        add(new HashMap<String, String>(){{
         put("字段编号", "4");
         put("字段代码", "APPLICANT");
         put("字段含义", "申请人");
         put("数据类型", "VARCHAR");
         put("长度", "64");
         put("主键", " ");
         put("主码", " ");
        }});
        add(new HashMap<String, String>(){{
         put("字段编号", "5");
         put("字段代码", "LEAVE_TYPE");
         put("字段含义", "请假类型");
         put("数据类型", "VARCHAR");
         put("长度", "64");
         put("主键", " ");
         put("主码", " ");
        }});
        add(new HashMap<String, String>(){{
         put("字段编号", "6");
         put("字段代码", "REASON");
         put("字段含义", "请假事因");
         put("数据类型", "VARCHAR");
         put("长度", "64");
         put("主键", " ");
         put("主码", " ");
        }});
        add(new HashMap<String, String>(){{
         put("字段编号", "7");
         put("字段代码", "BEGIN_TIME");
         put("字段含义", "起始时间");
         put("数据类型", "TIMESTAMP");
         put("长度", "");
         put("主键", " ");
         put("主码", " ");
        }});
        add(new HashMap<String, String>(){{
         put("字段编号", "8");
         put("字段代码", "END_TIME");
         put("字段含义", "结束时间");
         put("数据类型", "TIMESTAMP");
         put("长度", "");
         put("主键", " ");
         put("主码", " ");
        }});
        add(new HashMap<String, String>(){{
         put("字段编号", "9");
         put("字段代码", "INSERT_PERSON");
         put("字段含义", "登记人");
         put("数据类型", "VARCHAR");
         put("长度", "64");
         put("主键", " ");
         put("主码", " ");
        }});
        add(new HashMap<String, String>(){{
         put("字段编号", "10");
         put("字段代码", "APPROVEDBY");
         put("字段含义", "批准人");
         put("数据类型", "VARCHAR");
         put("长度", "64");
         put("主键", " ");
         put("主码", " ");
        }});
       }
      };
      //构建数据源中的key值
      String[] keysStrings={"字段编号","字段代码","字段含义","数据类型","长度","主键","主码"};
      //每页的名称
      String [] sheetNameStrings={"Sheet1","Sheet2","Sheet3","Sheet4","Sheet5","Sheet6"};
      String modelURLString="D:\model\model.xls";
      try {
       ExcelUtil.ExcelByModel("测试模板导出", modelURLString, dataSourceList, response, sheetNameStrings, keysStrings, 6);
      } catch (Exception e) {
       e.printStackTrace();
      }
     }
}