getTotalPrice()

最新推荐文章于 2022-05-23 18:52:48 发布

原创最新推荐文章于 2022-05-23 18:52:48 发布 · 1.5k 阅读

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本文探讨了在JSP中使用EL表达式调用对象字段时的注意事项，强调了get…()方法命名的重要性，避免出现PropertyNotFoundException错误。通过具体代码示例展示了如何正确调用totalPrice字段。

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jsp调用字段时注意事项

前端用${SHOPPINGCART_IN_SESSION.totalPrice}调用totalPrice时，getTotalPrice()方法的命名需要遵从get…()的原则。
否则报错：

严重: Servlet.service() for servlet [jsp] in context with path [] threw exception [javax.el.PropertyNotFoundException: Property 'totalPrice' not found on type com._520it._02shoppingcart.ShoppingCart] with root cause
javax.el.PropertyNotFoundException: Property 'totalPrice' not found on type com._520it._02shoppingcart.ShoppingCart
	at javax.el.BeanELResolver$BeanProperties.get(BeanELResolver.java:291)
	at javax.el.BeanELResolver$BeanProperties.access$300(BeanELResolver.java:243)
	at javax.el.BeanELResolver.property(BeanELResolver.java:378)
	at javax.el.BeanELResolver.getValue(BeanELResolver.java:97)
	at org.apache.jasper.el.JasperELResolver.getValue(JasperELResolver.java:104)
	at org.apache.el.parser.AstValue.getValue(AstValue.java:184)
	at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:190)

public BigDecimal getTotalPrice() {
		BigDecimal totalPrice = BigDecimal.ZERO;
		for (CartItem item : items) {
			totalPrice=totalPrice.add(item.getPrice().multiply(new BigDecimal(item.getNum())));
			System.out.println(totalPrice);
		}
		return totalPrice;
	}