1、bean中寫法：

	/** 標題 */
	@Length(max = 30, message = "只允許輸入30個字")
	@NotBlank(message = "請輸入標題")
	private String name;
	
	/** 獎勵額度 */
	@Digits(integer = 8, fraction = 2)
	@NotBlank(message = "請輸入獎勵額度")
	private String price_setting;
	
	/** 達幣數量 */
	@Digits(integer = 8, fraction = 2)
	@NotNull()
	private BigDecimal money;
 

2、controller中，根據情況判斷，顯示不同校驗資訊：

	/**
	 * 修改
	 * @param B008003Bean 畫面Bean
	 * @param request
	 * @return 返回上級頁面
	 */
	@RequestMapping("/update.do")
	public String update(@ModelAttribute("b008003Bean") @Validated B008003Bean b008003Bean,BindingResult errors,HttpServletRequest request,Model model){
		String strprice_setting = b008003Bean.getPrice_setting();
		String strupperprice = b008003Bean.getUpperprice();
		BigDecimal price_setting = new BigDecimal(strprice_setting);
		// 分情況顯示校驗資訊
		if(price_setting.compareTo(new BigDecimal("0.01")) == -1){
			errors.rejectValue("price_setting","","獎勵額度不可小於0.01。");
		}
		if(!strprice_setting.equals("") && !strupperprice.equals("")){
			BigDecimal upperprice = new BigDecimal(strupperprice);
			if(price_setting.compareTo(upperprice) == 1){
				errors.rejectValue("price_setting","","獎勵額度不允許超出限額。");
			}
		}
		if(errors.hasErrors()){
			// 資料重新複製回頁面中
			List<B008002TypeBean> categoryList = b008002Service.getCategorys();
			b008003Bean.setCategoryList(categoryList);
			model.addAttribute("b008003Bean", b008003Bean);
			return "/b008/b008003";
		}
		b008003Service.update(b008003Bean);
		// 返回上級頁面
		return "redirect:/b008/b008001/init.do";
	}
 

3、jsp中程式碼：
 

<div class="form-group">
	<label class="col-sm-2 control-label"><i style = "color:red;padding-right: 5px;">*</i>完成獎勵:</label>
	<div class="col-sm-8">
		<sf:input type="text" onkeyup="this.value= this.value.match(/\d+(\.\d{0,2})?/) ? this.value.match(/\d+(\.\d{0,2})?/)[0] : ''" 
		path="price_setting" placeholder="完成獎勵" class="form-control" required="" value="${b008003Bean.price_setting}"/>
		<sf:errors path="price_setting" cssStyle="color:red"/>
	</div>
</div>