方法一：
int N = Integer.parseInt(vars.get("build_matchNr"));
log.info(N.toString());
List list = new ArrayList();
for(int i=1;i<=N;i++){
String dig = vars.get("build_"+i+"_g1");
log.info(dig);
list.add(dig);
}
log.info(list.toString());
String id_data = String.join(",", list);
vars.put("id_list", id_data);
方法二：
int N = Integer.parseInt(vars.get("build_matchNr"));
log.info(N.toString());
String das = "";
for(int i=1;i<=N;i++){
String dig = vars.get("build_"+i+"_g1");
log.info(dig);
das += dig + ",";
}
log.info(das);
vars.put("id_list", das);
