request.getParameterMap() 获取表单提交的键值对 并且 也能获取动态表单的key

Map<String,String[]> map = request.getParameterMap();
Set<String> keys = map.keySet(); 获取表单的name
for(String key:keys){
    String[] values = request.getParameterValues(key); 获取数组型 值 因为不止单选 还有多选  干脆都用多选
    for (String value:values) {
        System.out.println(value);
    }
}