使用poi导出excel根据指定列自动合并行

ゞ浴缸里的玫瑰 2022-05-22 07:50 243阅读 0赞

一、效果图

![70][]

二、js代码

三、后台代码

（1）controller

@RequestMapping(value="jee/VAssessEvaluationSummaryC")
    @Controller
    public class VAssessEvaluationSummaryController extends BaseEntityController<VAssessEvaluation>{
    
    	public VAssessEvaluationSummaryController(){
    		super(VAssessEvaluation.class);
    	}
    	
    	@Resource
    	private VAssessEvaluationSummaryService vAssessEvaluationSummaryService;
    
    	
    	@ResponseBody
    	@SystemControllerLog(description="考核评价汇总--导出功能")
    	@RequestMapping(value="exportExecl")
    	public ReturnDatas exportExecl(String[] key_columns,String[] value_columns,HttpServletResponse response){
    		ReturnDatas returnDatas = ReturnDatas.getSuccessReturnDatas();
    		try {
    			response.setCharacterEncoding("UTF-8");
                response.setContentType("application/msexcle");   
                response.setHeader("content-disposition", "attachment;filename="+new String("考核评价".getBytes("gb2312"),"ISO8859-1")+".xlsx");
                HSSFWorkbook workbook = vAssessEvaluationSummaryService.exportExecl(key_columns,value_columns);
                //写入Excel文件  
                OutputStream outputStream =  response.getOutputStream();  
                workbook.write(outputStream);  
                outputStream.close();  
    			returnDatas.setStatus(ReturnDatas.SUCCESS);
    			return returnDatas;
    		} catch (Exception e) {
    			e.printStackTrace();
    			LogUtil.error("考核评价汇总--导出功能异常："+e.getMessage(),e);
    			returnDatas.setStatus(ReturnDatas.ERROR);
    			returnDatas.setMessage("考核评价汇总--导出功能异常。");
    		}
    		return returnDatas;
    	}
    }

注：excel文件中文名乱码使用"+new String("考核评价".getBytes("gb2312"),"ISO8859-1")+".xlsx"解决

（2）service

@Service("vAssessEvaluationSummaryService")
    public class VAssessEvaluationSummaryServiceImpl implements VAssessEvaluationSummaryService {
    	private List<VAssessEvaluation> list;
    	@Resource
    	private IbaseInfoService baseInfoService;
    	
    	/**
    	 * 
    	 * @Description 考核评价汇总--查询操作 
    	 * @param rows
    	 * @param page
    	 * @param sort
    	 * @param order
    	 * @param key
    	 * @param start_time
    	 * @param end_time
    	 * @param id_postduty
    	 * @param question_type
    	 * @return PageResult
    	 * @throws Exception 
    	 *
    	 */
    	@Override
    	public PageResult listAllVassessEvaluationSummary(int rows,int page,String sort, String order,String key,String start_time, String end_time,
    			String id_postduty,String question_type) throws Exception {
    		if(StringUtils.isBlank(key)) {
    			key = "";
    		}
    		List<Object> ls_param = new ArrayList<Object>();
    		String hql = "select u from VAssessEvaluation u where (del_flag is null or del_flag != '1')";
    		String hqlCount = "select count(u) from VAssessEvaluation u where (del_flag is null or del_flag != '1')";
    		if(StringUtils.isNotBlank(key)) {
    			hql+= " and ( instr(type,?) > 0 or instr(updateuser,?)>0 or instr(updatetime,?)>0 )";
    			hqlCount += " and ( instr(type,?) > 0 or instr(updateuser,?)>0 or instr(updatetime,?)>0 )";
    			ls_param.add(key);
    			ls_param.add(key);
    			ls_param.add(key);
    		}
    		if(StringUtils.isNotBlank(start_time)) {
    			hql += " and find_date >= ?";
    			hqlCount += " and find_date >= ?";
    			ls_param.add(start_time);
    		}
    		if(StringUtils.isNotBlank(end_time)) { 
    			hql += " and find_date <= ?";
    			hqlCount += " and find_date <= ?";
    			ls_param.add(end_time);
    		}
    		if(StringUtils.isNotBlank(question_type)) { 
    			hql += " and id_question_type = ?";
    			hqlCount += " and id_question_type = ?";
    			ls_param.add(question_type);
    		}
    		if(StringUtils.isNotBlank(id_postduty)) { 
    			hql += " and id_postduty = ?";
    			hqlCount += " and id_postduty = ?";
    			ls_param.add(id_postduty);
    		}
    		if(StringUtils.isNotBlank(sort)&&StringUtils.isNotBlank(order)) {
    			hql += " order by " + sort + " " + order;
    		}
    		list = baseInfoService.listQueryByHql(hql,ls_param,rows,page);
    		Object total = baseInfoService.getObjectByHql(hqlCount,ls_param);
    		PageResult result = new PageResult();
    		if (list != null) {
    			result.setRows(list);
    			if (total != null) {
    				result.setTotal(Integer.parseInt(total.toString()));
    			} else {
    				result.setTotal(0);
    			}
    		}
    		return result;
    	}
    	
    	/**
    	 * 
    	 * @Description 考核评价汇总--导出功能 
    	 * @param key_columns
    	 * @param value_columns
    	 * @return HSSFWorkbook
    	 * @throws Exception 
    	 *
    	 */
    	@Override
    	public HSSFWorkbook exportExecl(String[] key_columns, String[] value_columns) throws Exception {
    		List<List<String>> list1 = new ArrayList<>();
    		for (VAssessEvaluation v : list) {
    			List<String> list2 = new ArrayList<>();
    			for (int i = 0; i < key_columns.length; i++) {
    				String field = ExportUtil.getFiled(v, key_columns[i]);
    				if("performance".equals(key_columns[i])){
    					if(v.getPerformance()!=0) {
    						list2.add("-"+field);
    					}else {
    						list2.add(field);
    					}
    				}else {
    					list2.add(field);
    				}
    			}
    			list1.add(list2);
    		}
    		int[] arr = {1,2,3}; //要合并的列，从0开始
    		int judge = 10; //判断字段，没有则为-1
    		return ExportUtil.exportAutoCell("考核评价汇总",key_columns,value_columns,list1,arr,judge);
    	}
    	
    }

（3）导出工具类

public class ExportUtil {
        
        /**
         * 
         * @Date 2018年6月19日 下午3:46:27
         * @Description 导出自动合并单元格 
         * @Fcunction exportAutoCell
         * @param sheetName
         * @param key_columns
         * @param value_columns
         * @param list
         * @param field_arr
         * @param judge
         * @return HSSFWorkbook
         *
         */
        public static HSSFWorkbook exportAutoCell(String sheetName,String[] key_columns,String[] value_columns,List<List<String>> list,int[] field_arr,int judge){
            //创建一个Excel文件
            HSSFWorkbook workbook = new HSSFWorkbook();
            //创建一个工作表
            HSSFSheet sheet = workbook.createSheet(sheetName);
            //添加表头行
            HSSFRow hssfRow = sheet.createRow(0);
            //设置单元格格式
            HSSFCellStyle cellStyle = workbook.createCellStyle();
            //设置单元格边框
            cellStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
            cellStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
            cellStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
            cellStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
            cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER); //水平居中
            cellStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); //垂直居中
            for (int i = 0; i < value_columns.length; i++) {
            	//添加表头内容
                HSSFCell headCell = hssfRow.createCell(i);
                headCell.setCellValue(value_columns[i]);
                headCell.setCellStyle(cellStyle);
    		}
            //把数据添加到excel
            for (int i = 0; i < list.size(); i++) { //每一行
            	hssfRow = sheet.createRow(i + 1);
            	for (int j = 0; j < list.get(i).size(); j++) { //每一行的每一格
            		//创建单元格，并设置值
            		HSSFCell cell = hssfRow.createCell(j);
            		cell.setCellValue(list.get(i).get(j));
            		cell.setCellStyle(cellStyle);
    				
    			}
            }
            
            //自动合并
        	for (int k = 0; k < field_arr.length; k++) {
        		int field = field_arr[k]; //要排序的字段
        		int d = 0; //下次要合并的行
                int n = list.size()-1; //当前合并的行
        		for (int i = list.size()-1; i >= 1; i--) { //每一行
        			if(i!=(n-d)) {
        				continue;
        			}
        			if(list.get(i).get(field).equals(list.get(i-1).get(field))){ //相邻的上下两行
        				if(judge!=-1) {
    						if(!list.get(i).get(judge).equals(list.get(i-1).get(judge))){
    							break;
    						}
    					}
        				int rowspan = 2;
        				d = rowspan;
        				for (int j = 2; i-j >= 0; j++) { //判断上下多行内容一样
        					n = i;
        					if(!list.get(i).get(field).equals(list.get(i-j).get(field))){
        						break;
        					}else{
        						if(judge!=-1) {
        							if(!list.get(i).get(judge).equals(list.get(i-j).get(judge))){
        								break;
        							}
        						}
        						rowspan = j+1;
        						d = rowspan;
        					}
        				}
        				sheet.addMergedRegion(new CellRangeAddress(i-rowspan+2, i+1, field, field)); 
        			}else {
        				d = 0;
        				n = i-1;
        			}
        			
        		}
        	}
            return workbook;
        }
    
        /**
         * 
         * @Author zhangshizhe
         * @Date 2018年6月15日 下午1:53:52
         * @Description 利用反射获取get方法 
         * @Fcunction getFiled
         * @param object
         * @param field
         * @return String
         *
         */
        public static String getFiled(Object object, String field) {
            Class<? extends Object> clazz  = object.getClass();
            PropertyDescriptor pd = null;
            Method getMethod = null;
            try {
                pd = new PropertyDescriptor(field, clazz);
                if (null != pd) {
                    // 获取  这个 field 属性 的get方法
                    getMethod = pd.getReadMethod();
                    Object invoke = getMethod.invoke(object);
                    if(invoke==null) {
                    	invoke = "";
                    }
                    return invoke.toString();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            return "";
        }
        
    }

注：合并导org.apache.poi.ss.util.CellRangeAddress包，org.apache.poi.hssf.util.CellRangeAddress包已废弃；

import org.apache.poi.ss.util.CellRangeAddress;

合并addMergedRegion方法四个属性分别是（开始行，结束行，开始列，结束列）

sheet.addMergedRegion(new CellRangeAddress(0, 1, 0, 1));

[70]: /images/20220522/828de7c52a544424958ce453d26078bb.png