java导出excel时合并同一列中相同内容的行

一、有时候导出Excel时需要按类别导出,一大类下好几个小类,小类下又有好几个小小类,就像下图:

图片描述

要实现这个也不难,

思路如下:按照大类来循环,如上就是按照张江校区、徐汇校区、临港校区三个大类循环,然后再处理小类,因为本例小小类不涉及合并,所以只涉及处理小类,如果需要处理小小类,还需要在处理一下,具体实现原理同小类;

     每次循环时记录下此次循环的房屋类型和上次循环的房屋类型,两者相同时,要合并的结束行++,否者,说明这个房屋类型已经循环完毕(前提是各类型都按顺序order by 了,保证相同类型相邻),开始融合。具体实现如下:

二、实现代码,具体思路已经在注释中了

public void expStatistics(String filePath,String campuscode) {
        try {
            WritableWorkbook wwb = Workbook.createWorkbook(new File(filePath));
            JxlFormatUtil Jfu = new JxlFormatUtil();
            WritableSheet ws = wwb.createSheet("房屋报表统计", 0);
            
            String[] tableHead = {"校区名称:20","房屋类型:30","房屋用途:30","使用面积(㎡):20"};
            for (int i = 0; i < tableHead.length; i++) {//每一列的标题样式
                ws.addCell(new Label(i, 0, tableHead[i].split(":")[0], JxlFormatUtil.wcHead));
                ws.setColumnView(i, Integer.valueOf(tableHead[i].split(":")[1]));
            }
            int col = 1;//从第1行开始
            
            //以下变量用来融合相同内容 的行
            int perCol = col;
            String perPurpose = "";//上一个用途类型
            String purpose = "";//当前用途类型
            int startMergeCol = 1;//要融合的第一行
            int endMergeCol = 0;//要融合的最后行
            boolean flag = true;//用来记录是否是第一次循环
            
            //根据搜索条件导出
            List<FcxtCampus> campusList = new ArrayList<FcxtCampus>();
            if(null != campuscode &amp;&amp; !"".equals(campuscode)){
                campusList = campusdao.findCampusByCode(campuscode);
            }else {
                campusList =campusdao.findCampus();
            }
            
            for (FcxtCampus campus : campusList) {
                List<FcxtBuild> builds = builddao.statisticsBuilds(campus.getCampuscode());//获取所有房屋信息
                if(null != builds &amp;&amp; builds.size() > 0){
                    for (FcxtBuild build : builds) {
                        int row = 0;//从第0列开始
                        ws.addCell(new Label(row++, col, campus.getCampusname(), JxlFormatUtil.wcCenter));
                        purpose = build.getUsefulpurpose();
                        if(flag){//如果是第一次循环,将perPurpose初始化,以便后面的第一次判断
                            perPurpose = purpose;
                            flag = false;
                        }
                        ws.addCell(new Label(row++, col, FcxtBuild.BUILD_USEFULPURPOSE.get(build.getUsefulpurpose()), JxlFormatUtil.wcCenter));
                        if(purpose.equals(perPurpose)){
                            endMergeCol++;
                        }else{//两者不相同时,融合之前相同的行
                            ws.mergeCells(1, startMergeCol, 1, endMergeCol);
                            startMergeCol = col;
                            endMergeCol = startMergeCol;
                            perPurpose = purpose;
                        }
                        ws.addCell(new Label(row++, col, FcxtBuild.BUILD_BUILDINGTYPE.get(build.getBuildingtype()), JxlFormatUtil.wcCenter));
                        ws.addCell(new Label(row++, col, build.getBuildarea().toString(), JxlFormatUtil.wcCenter));
                        col++;
                    }
                    ws.mergeCells(0, perCol, 0, col-1);
                    perCol = col;
                }
            }
            
            wwb.write();
            wwb.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }