需求，要求批量新增或者改动一个List，在Spring MVC中是不支持以下代码的写法

@RequestMapping(value = "/update", method = RequestMethod.POST)	public String update(List
     
       productCollocations ,HttpServletRequest request, RedirectAttributes redirectAttributes) {		for (ProductCollocation productCollocation : productCollocations) {
     			productCollocation.setModifyDate(DateUtil.getDate());			productCollocationService.update(productCollocation, "create_date","product","collocation","description");		}		addFlashMessage(redirectAttributes, SUCCESS_MESSAGE);		return "redirect:list.jhtml";	}
     

nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [java.util.List]:

新增一个Form

public class ProductCollocationForm {	List
     
       productCollocations;	/**	 * @return the productCollocations	 */	public List
      
        getProductCollocations() {		return productCollocations;	}	/**	 * @param productCollocations the productCollocations to set	 */	public void setProductCollocations(List
       
         productCollocations) {		this.productCollocations = productCollocations;	}}
       
      
     

@RequestMapping(value = "/update", method = RequestMethod.POST)	public String update(ProductCollocationForm productCollocationForm ,HttpServletRequest request, RedirectAttributes redirectAttributes) {		for (ProductCollocation productCollocation : productCollocationForm.getProductCollocations()) {			productCollocation.setModifyDate(DateUtil.getDate());			productCollocationService.update(productCollocation, "create_date","product","collocation","description");		}		addFlashMessage(redirectAttributes, SUCCESS_MESSAGE);		return "redirect:list.jhtml";	}