jsp复选框的取值问题

jsp页面中:

购买的产品：<input   type='checkbox'   name='Products'   value='a'>   
<input   type='checkbox'   name='Products'   value='b'>   
<input   type='checkbox'   name='Products'   value='c'>   
<input   type='checkbox'   name='Products'   value='d'> 

control中:

String[] Product = request.getParameterValues("Products");
StringBuffer g = new StringBuffer();
for(int i=0;i< Product.length;i++){//字符串拼接时使用
g.append(Product[i]+" ");
}
String Products = g.toString();