java 엑셀파일 다운 코딩

JAVA - List<Map<String, Object>> excelList = new ArrayList<Map<String,Object>>(); excelList = testService.selectList(testVo);   List<Object> titleList = new ArrayList<Object>();   titleList.add("순위" ); titleList.add("순위2" ); titleList.add("순위3" ); titleList.add("순위4" ); titleList.add("순위5" ); titleList.add("순위6" ); titleList.add("순위7" );   List<Object> dataList = new ArrayList<Object>();   for(int i = 0; excelList .size(); i++;) {     List<Object> subList = new ArrayList<Object>();'      subList .add(excelList.get(i).get("rank1") == null ? "" :  subList .add(excelList.get(i).get("rank1"));     subList .add(excelList.get(i).get("rank2") == null ? "" :  subList .add(excelList.get(i).get("rank2"));     subList .add(excelList.get(i).get("rank3") == null ? "" :  subList .add(excelList.get(i).get("rank3"));     subList .add(excelList.get(i).get("rank4") == null ? "" :  subList .add(excelList.get(i).get("rank4"));     subList .add(excelList.get(i).get("rank5") == null ? "" :  subList .add(excelList.get(i).get("rank5"));     subList .add(excelList.get(i).get("rank6") == null ? "" :  subList .add(excelList.get(i).get("rank6"));     subList .add(excelList.get(i).get("rank7") == null ? "" :  subList .add(excelList.get(i).get("rank7"));       dataList .add(subList); }   model.put("titleList ",titleList ) model.put("list",dataList) model.put("name","rank") model.put("sheetName","순위") return "excelView";