request.getParameterMap() 獲取表單提交的鍵值對 並且 也能獲取動態表單的key

Map<String,String[]> map = request.getParameterMap();
Set<String> keys = map.keySet(); 獲取表單的name
for(String key:keys){
    String[] values = request.getParameterValues(key); 獲取數組型 值 因為不止單選 還有多選  干脆都用多選
    for (String value:values) {
        System.out.println(value);
    }
}