将 h:selectBooleanCheckbox 值绑定到 int/Integer 而不是 boolean/Boolean

问题描述

我有一个 <h:selectBooleanCheckbox value="#{someBean.prop}"> 其中 prop 是 int.真的不能马上生效吗?我是否必须实现自定义转换器才能将 Boolean 转换为 int?有没有人碰巧有库存的转换器代码?我读到 JSF 2.0 中有一些错误会阻止处理 的转换器.谁能确认一下?

I have a <h:selectBooleanCheckbox value="#{someBean.prop}"> where prop is a property of type int. Is it really not working straight away? Do I have to implement a custom converter to convert Boolean to int? Does anyone happen to have converter code for that at stock? I read that there is some bug in JSF 2.0 that prevents converters for <h:selectBooleanCheckbox> to be processed. Can anyone confirm that?

我使用 MyFaces 2、Tomahawk 和 Tomcat 6.

I use MyFaces 2, Tomahawk and Tomcat 6.

推荐答案

，正如它的名字所说，应该绑定到一个 boolean或 Boolean 属性.没有其他的.它允许 converter 属性实际上是规范中的一个 错误.它不应该允许它.

The <h:selectBooleanCheckbox> should, as its name say, be bound to a boolean or Boolean property. Nothing else. That it allows a converter attribute is actually a bug in the spec. It should never have allowed it.

问题更多出在您的模型中，为什么要使用 int 来表示布尔状态?改变你的模型，让它成为一个完整的boolean.

The problem is more in your model, why would you use an int to represent a boolean state? Change your model to let it be a fullworthy boolean.

如果由于某种原因(第 3 方 API、愚蠢的架构师或愚蠢的业务限制等)无法更改模型，则将模型 getter/setter 包装在支持 bean 中，如下所示

If changing the model isn't an option for some reason (a 3rd party API, a stupid architect, or stupid business restrictions, etc), then wrap the model getter/setter in the backing bean like follows

public boolean isChecked() {
    return someModel.getSomeInt() != 0;
}

public void setChecked(boolean checked) {
    someModel.setSomeInt(checked ? 1 : 0);
}

并将其用作 <h:selectBooleanCheckbox value="#{bean.checked}"/>.

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