POI导出Excel--合并单元格

package com.test.util;  
  
import java.io.FileNotFoundException;  
import java.io.FileOutputStream;  
import java.io.IOException;  
import java.io.OutputStream;  
import java.net.URLEncoder;  
import java.util.ArrayList;  
import java.util.Collections;  
import java.util.Comparator;  
import java.util.HashSet;  
import java.util.Iterator;  
import java.util.List;  
import java.util.Set;  
  
import javax.servlet.http.HttpServletResponse;  
import javax.swing.JOptionPane;  
  
import org.apache.commons.collections.CollectionUtils;  
import org.apache.poi.hssf.usermodel.HSSFCell;  
import org.apache.poi.hssf.usermodel.HSSFCellStyle;  
import org.apache.poi.hssf.usermodel.HSSFDataFormat;  
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;  
import org.apache.poi.ss.util.CellReference;  
  
/** 
 * @author zhanghk 
 */  
public class ExcelUtil_Extend {  
    /** 
     * @param fileName 文件名称 
     * @param headers 表头 
     * @param dataset 数据集 
     * @param isSortDataSet 是否对数据排序 
     * @param response HttpServletResponse 
     * @param mergeBasis 合并基准列 可选 
     * @param mergeCells 要合并的列 可选 
     * @param sumCellsMap 要求和的列 可选 
     * @param timeCells 时间列 可选 
     * @throws IOException 
     */  
    public static void exportExelMerge(String fileName,final String[] headers,List<String[]> dataset,boolean isSortDataSet,HttpServletResponse response, final Integer[] mergeBasis, final Integer[] mergeCells, final Integer[] sumCells, final Integer[] timeCells) throws IOException{  
        String title = "Sheet1";  
        response.setContentType("application/vnd.ms-excel;charset=utf-8");   
        response.setHeader("Content-disposition", "attachment;filename=" + URLEncoder.encode(fileName, "utf-8"));  
          
        createExcelMerge(title,headers,dataset,isSortDataSet,response.getOutputStream(),mergeBasis,mergeCells,sumCells,timeCells);  
          
        response.setStatus(HttpServletResponse.SC_OK);  
        response.flushBuffer();  
    }  
      
    /** 
     * @param title 文件名称 
     * @param headers 表头 
     * @param dataset 数据集 
     * @param isSortDataSet 是否对数据排序 
     * @param out OutputStream 
     * @param mergeBasis 合并基准列 可选 
     * @param mergeCells 要合并的列 
     * @param sumCells 要求和的列 
     * @param timeCells 时间列 可选 
     */  
    public static void createExcelMerge(String title, final String[] headers,List<String[]> dataset,boolean isSortDataSet, OutputStream out, final Integer[] mergeBasis, final Integer[] mergeCells, final Integer[] sumCells, final Integer[] timeCells){  
        HSSFWorkbook workbook = new HSSFWorkbook();  
        HSSFSheet sheet = workbook.createSheet(title);  
          
        sheet.setDefaultColumnWidth(15); // 设置表格默认列宽度为15个字节    
          
        HSSFCellStyle headStyle = createHeadStyle(workbook); // 生成头部样式   
        HSSFCellStyle commonDataStyle = createCommonDataStyle(workbook); // 生成一般数据样式    
        HSSFCellStyle numStyle = createNumStyle(workbook); //生成数字类型保留两位小数样式  
        HSSFCellStyle sumRowStyle = createSumRowStyle(workbook); //生成合计行样式  
  
        if(headers == null || headers.length <= 0){  
            return;  
        }  
          
        HSSFRow row = sheet.createRow(0); // 产生表格标题行    
        for (int i = 0; i < headers.length; i++) {  
            HSSFCell cell = row.createCell(i);  
            cell.setCellStyle(headStyle);  
            HSSFRichTextString text = new HSSFRichTextString(headers[i]);  
            cell.setCellValue(text);  
        }  
          
        if(isSortDataSet && mergeBasis != null && mergeBasis.length > 0){ //是否排序数据  
            Collections.sort(dataset, new Comparator<String[]>() {  
                public int compare(String[] o1, String[] o2) {  
                    String s1 = "";  
                    String s2 = "";  
                    for(int i = 0 ; i < mergeBasis.length ; i++){  
                        s1+=(o1[mergeBasis[i].intValue()]+Character.valueOf((char)127).toString());  
                        s2+=(o2[mergeBasis[i].intValue()]+Character.valueOf((char)127).toString());  
                    }  
                    if(timeCells != null && timeCells.length > 0){  
                        for(int i = 0 ; i < timeCells.length ; i++){  
                            s1+= o1[timeCells[i].intValue()];  
                            s2+= o2[timeCells[i].intValue()];  
                        }  
                    }  
                    if(s1.compareTo(s2) < 0){  
                        return -1;  
                    }else if(s1.compareTo(s2) == 0){  
                        return 0;  
                    }else{  
                        return 1;  
                    }  
                }  
            });  
        }  
        // 遍历集合数据，产生数据行    
        Iterator<String[]> it = dataset.iterator();    
        int index = 0;    
        while (it.hasNext()) {  
            index++;    
            row = sheet.createRow(index);    
            String[] dataSources = it.next() ;  
            for (int i = 0; i < dataSources.length; i++) {    
                HSSFCell cell = row.createCell(i);    
                cell.setCellStyle(commonDataStyle);  
                cell.setCellValue(dataSources[i]);  
            }  
        }    
        try {    
            if(mergeBasis != null && mergeBasis.length > 0 && mergeCells != null && mergeCells.length > 0){  
                for(int i = 0 ; i < mergeCells.length ; i++){  
                    mergedRegion(sheet,mergeCells[i],1,sheet.getLastRowNum(),workbook,mergeBasis);  
                }  
            }  
            if(sumCells != null && sumCells.length > 0){  
                createSumRow(sheet, row, headers, sumCells, sumRowStyle, numStyle);  
            }  
            workbook.write(out);    
        } catch (IOException e) {    
            e.printStackTrace();    
        } finally {  
            try {  
                out.close();  
            } catch (IOException e) {  
                e.printStackTrace();  
            }  
        }  
    }  
      
    /** 
     * 创建合计行 
     * @param sheet 
     * @param row 
     * @param headers 
     * @param sumCells 
     * @param sumRowStyle 
     * @param numStyle 
     */  
    private static void createSumRow(HSSFSheet sheet , HSSFRow row , final String[] headers, final Integer[] sumCells , HSSFCellStyle sumRowStyle,HSSFCellStyle numStyle){  
        row=sheet.createRow(sheet.getLastRowNum()+1);  
        for (int i = 0; i < headers.length; i++) {  
            HSSFCell cell = row.createCell(i);  
            cell.setCellStyle(sumRowStyle);  
        }  
        for(int i = 1 ; i < sheet.getLastRowNum() ; i++){  
            for(int j = 0 ; j < sumCells.length ; j++){  
                sheet.getRow(i).getCell(sumCells[j]).setCellValue(Double.parseDouble(sheet.getRow(i).getCell(sumCells[j]).getStringCellValue()));  
                sheet.getRow(i).getCell(sumCells[j]).setCellStyle(numStyle);  
            }  
        }  
        HSSFCell sumCell = row.getCell(0);  
        sumCell.setCellValue("合计：");  
        String sumFunctionStr = null;  
        for(int i = 0 ; i < sumCells.length ; i++){  
            sumFunctionStr = "SUM("+CellReference.convertNumToColString(sumCells[i])+"2:"+CellReference.convertNumToColString(sumCells[i])+sheet.getLastRowNum()+")";  
            row.getCell(sumCells[i]).setCellFormula(sumFunctionStr);  
        }  
    }  
      
    /** 
     * 合并单元格 
     * @param sheet 
     * @param cellLine 
     * @param startRow 
     * @param endRow 
     * @param workbook 
     * @param mergeBasis 
     */  
    private static void mergedRegion(HSSFSheet sheet, int cellLine,int startRow, int endRow, HSSFWorkbook workbook, Integer[] mergeBasis) {  
        HSSFCellStyle style = workbook.createCellStyle();           // 样式对象    
        style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);  // 垂直    
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER);             // 水平    
        String s_will = sheet.getRow(startRow).getCell(cellLine).getStringCellValue();  // 获取第一行的数据,以便后面进行比较    
        int count = 0;    
        Set<Integer> set = new HashSet<Integer>();  
        CollectionUtils.addAll(set, mergeBasis);  
        for (int i = 2; i <= endRow; i++) {    
            String s_current = sheet.getRow(i).getCell(cellLine).getStringCellValue();    
            if (s_will.equals(s_current)) {   
                boolean isMerge = true;  
                if(!set.contains(cellLine)){//如果不是作为基准列的列 需要所有基准列都相同  
                    for(int j = 0 ; j < mergeBasis.length ; j++){  
                        if(!sheet.getRow(i).getCell(mergeBasis[j]).getStringCellValue()  
                                .equals(sheet.getRow(i-1).getCell(mergeBasis[j]).getStringCellValue())){  
                            isMerge = false;  
                        }  
                    }  
                }else{//如果作为基准列的列 只需要比较列号比本列号小的列相同  
                    for(int j = 0 ; j < mergeBasis.length && mergeBasis[j] < cellLine ; j++){  
                        if(!sheet.getRow(i).getCell(mergeBasis[j]).getStringCellValue()  
                                .equals(sheet.getRow(i-1).getCell(mergeBasis[j]).getStringCellValue())){  
                            isMerge = false;  
                        }  
                    }  
                }  
                if(isMerge){  
                    count++;  
                }else{  
                    sheet.addMergedRegion(new CellRangeAddress( startRow, startRow+count,cellLine , cellLine));  
                    startRow = i;    
                    s_will = s_current;  
                    count = 0;  
                }  
            } else {    
                sheet.addMergedRegion(new CellRangeAddress( startRow, startRow+count,cellLine , cellLine));    
                startRow = i;    
                s_will = s_current;  
                count = 0;  
            }    
            if (i == endRow && count > 0) {    
                sheet.addMergedRegion(new CellRangeAddress(startRow,startRow+count ,cellLine , cellLine));    
            }    
        }    
    }  
  
    /** 
     * 标题单元格样式 
     * @param workbook 
     * @return 
     */  
    private static HSSFCellStyle createHeadStyle(HSSFWorkbook workbook){  
        //标题单元格样式  
        HSSFCellStyle headStyle = workbook.createCellStyle();     
        headStyle.setFillForegroundColor(HSSFColor.SKY_BLUE.index);    
        headStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);    
        headStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);    
        headStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);    
        headStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);    
        headStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);    
        headStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);    
        //标题单元格字体    
        HSSFFont headFont = workbook.createFont();    
        headFont.setColor(HSSFColor.VIOLET.index);    
        headFont.setFontHeightInPoints((short) 12);    
        headFont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);    
        // 把字体应用到当前的样式    
        headStyle.setFont(headFont);    
        return headStyle;  
    }  
      
    /** 
     * 合计行单元格样式 
     * @param workbook 
     * @return 
     */  
    private static HSSFCellStyle createSumRowStyle(HSSFWorkbook workbook){  
        //合计行单元格样式  
        HSSFCellStyle sumRowStyle = workbook.createCellStyle();    
        sumRowStyle.setFillForegroundColor(HSSFColor.SKY_BLUE.index);    
        sumRowStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);    
        sumRowStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);    
        sumRowStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);    
        sumRowStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);    
        sumRowStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);    
        sumRowStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);   
        sumRowStyle.setDataFormat(HSSFDataFormat.getBuiltinFormat("#,##0.00"));  
        //合计行单元格字体    
        HSSFFont sumRowFont = workbook.createFont();    
        sumRowFont.setColor(HSSFColor.VIOLET.index);    
        sumRowFont.setFontHeightInPoints((short) 12);    
        sumRowFont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);    
        // 把字体应用到当前的样式    
        sumRowStyle.setFont(sumRowFont);      
        return sumRowStyle;  
    }  
      
    /** 
     * 普通数据单元格样式  
     * @param workbook 
     * @return 
     */  
    private static HSSFCellStyle createCommonDataStyle(HSSFWorkbook workbook){  
        //普通数据单元格样式   
        HSSFCellStyle commonDataStyle = workbook.createCellStyle();    
        commonDataStyle.setFillForegroundColor(HSSFColor.LIGHT_YELLOW.index);    
        commonDataStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);    
        commonDataStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);    
        commonDataStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);    
        commonDataStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);    
        commonDataStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);    
        commonDataStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);    
        commonDataStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);    
        //普通数据单元格字体    
        HSSFFont commonDataFont = workbook.createFont();    
        commonDataFont.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);    
        //把字体应用到当前的样式    
        commonDataStyle.setFont(commonDataFont);   
        return commonDataStyle;  
    }  
      
    /** 
     * 自定义保留两位小数数字单元格格式 
     * @param workbook 
     * @return 
     */  
    private static HSSFCellStyle createNumStyle(HSSFWorkbook workbook){  
        //自定义保留两位小数数字单元格格式  
        HSSFCellStyle numStyle = workbook.createCellStyle();    
        numStyle.setFillForegroundColor(HSSFColor.LIGHT_YELLOW.index);    
        numStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);    
        numStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);    
        numStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);    
        numStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);    
        numStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);    
        numStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);    
        numStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);    
        numStyle.setDataFormat(HSSFDataFormat.getBuiltinFormat("#,##0.00"));  
        //自定义保留两位小数数字单元格字体    
        HSSFFont numFont = workbook.createFont();    
        numFont.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);    
        //把字体应用到当前的样式    
        numStyle.setFont(numFont);   
        return numStyle;  
    }  
      
    public static void main(String[] args) {   
        String[] headers =  { "大区", "部门", "金额", "数量", "日期" };    
        List<String[]> dataset = new ArrayList<String[]>();    
        dataset.add(new String[] {"华东", "部门3", "35", "1", "2015-01-01"});    
        dataset.add(new String[] {"华北", "部门1", "20", "1", "2015-01-02"});    
        dataset.add(new String[] {"华北", "部门2", "25", "1", "2015-01-03"});    
        dataset.add(new String[] {"华北", "部门5", "25", "1", "2015-01-04"});    
        dataset.add(new String[] {"华南", "部门1", "15", "1", "2015-01-05"});    
        dataset.add(new String[] {"华北", "部门3", "30", "1", "2015-01-06"});    
        dataset.add(new String[] {"华北", "部门3", "30", "1", "2015-01-07"});    
        dataset.add(new String[] {"华东", "部门1", "25", "1", "2015-01-08"});    
        dataset.add(new String[] {"华南", "部门4", "30", "1", "2015-01-09"});     
        dataset.add(new String[] {"华东", "部门2", "25", "1", "2015-01-10"});    
        dataset.add(new String[] {"华东", "部门2", "25", "1", "2015-01-11"});    
        dataset.add(new String[] {"华东", "部门3", "35", "1", "2015-01-12"});    
        dataset.add(new String[] {"华南", "部门1", "15", "1", "2015-01-13"});    
        dataset.add(new String[] {"华北", "部门6", "20", "1", "2015-01-14"});    
        dataset.add(new String[] {"华南", "部门2", "25", "1", "2015-01-15"});    
        dataset.add(new String[] {"华南", "部门2", "25", "1", "2015-01-16"});    
        dataset.add(new String[] {"华东", "部门1", "25", "1", "2015-01-17"});    
        dataset.add(new String[] {"华南", "部门8", "30", "1", "2015-01-18"});     
        dataset.add(new String[] {"华东", "部门2", "35", "1", "2015-01-01"});    
        dataset.add(new String[] {"华北", "部门1", "20", "1", "2015-01-02"});    
        dataset.add(new String[] {"华北", "部门11", "25", "1", "2015-01-03"});    
        dataset.add(new String[] {"华北", "部门2", "25", "1", "2015-01-04"});    
        dataset.add(new String[] {"华南", "部门1", "15", "1", "2015-01-05"});    
        dataset.add(new String[] {"华北", "部门4", "30", "1", "2015-01-06"});    
        dataset.add(new String[] {"华北", "部门3", "30", "1", "2015-01-07"});    
        dataset.add(new String[] {"华东", "部门9", "25", "1", "2015-01-08"});    
        dataset.add(new String[] {"华南", "部门3", "30", "1", "2015-01-09"});     
        dataset.add(new String[] {"华东", "部门12", "25", "1", "2015-01-10"});    
        dataset.add(new String[] {"华东", "部门2", "25", "1", "2015-01-11"});    
        dataset.add(new String[] {"华东", "部门12", "35", "1", "2015-01-12"});    
        dataset.add(new String[] {"华南", "部门1", "15", "1", "2015-01-13"});    
        dataset.add(new String[] {"华北", "部门11", "20", "1", "2015-01-14"});    
        dataset.add(new String[] {"华南", "部门21", "25", "1", "2015-01-15"});    
        dataset.add(new String[] {"华南", "部门2", "25", "1", "2015-01-16"});    
        dataset.add(new String[] {"华东", "部门15", "25", "1", "2015-01-17"});    
        dataset.add(new String[] {"华南", "部门3", "30", "1", "2015-01-18"});     
        dataset.add(new String[] {"华东", "部门3", "35", "1", "2015-01-01"});    
        dataset.add(new String[] {"华北", "部门17", "20", "1", "2015-01-02"});    
        dataset.add(new String[] {"华北", "部门22", "25", "1", "2015-01-03"});    
        dataset.add(new String[] {"华北", "部门2", "25", "1", "2015-01-04"});    
        dataset.add(new String[] {"华南", "部门1", "15", "1", "2015-01-05"});    
        dataset.add(new String[] {"华北", "部门2", "30", "1", "2015-01-06"});    
        dataset.add(new String[] {"华北", "部门3", "30", "1", "2015-01-07"});    
        dataset.add(new String[] {"华东", "部门1", "25", "1", "2015-01-08"});    
        dataset.add(new String[] {"华南", "部门8", "30", "1", "2015-01-09"});     
        dataset.add(new String[] {"华东", "部门2", "25", "1", "2015-01-10"});    
        dataset.add(new String[] {"华东", "部门2", "25", "1", "2015-01-11"});    
        dataset.add(new String[] {"华东", "部门3", "35", "1", "2015-01-12"});    
        dataset.add(new String[] {"华南", "部门7", "15", "1", "2015-01-13"});    
        dataset.add(new String[] {"华北", "部门1", "20", "1", "2015-01-14"});    
        dataset.add(new String[] {"华南", "部门2", "25", "1", "2015-01-15"});    
        dataset.add(new String[] {"华南", "部门2", "25", "1", "2015-01-16"});    
        dataset.add(new String[] {"华东", "部门9", "25", "1", "2015-01-17"});    
        dataset.add(new String[] {"华南", "部门3", "30", "1", "2015-01-18"});     
        try {    
            OutputStream out = new FileOutputStream("E://a.xls");    
            ExcelUtil_Extend.createExcelMerge("测试.xls", headers, dataset, true, out, new Integer[]{0,1}, new Integer[]{0,1}, new Integer[]{2,3}, new Integer[]{4});    
            out.close();    
            JOptionPane.showMessageDialog(null, "导出成功!");    
            System.out.println("excel导出成功！");    
        } catch (FileNotFoundException e) {    
            e.printStackTrace();    
        } catch (IOException e) {    
            e.printStackTrace();    
        }  
    }  
}