jsp标记中的动态属性

Question

我想要一个带有动态属性的标签,比如简单的html标签,例如:

<tags:superTag dynamicAttribute1="value" someOtherAttribute="valueOfSomeOther"/>

在我的标签实现中我希望有这样的东西:

public class DynamicAttributesTag {

    private Map<String,String> dynamicAttributes;

    public Map<String, String> getDynamicAttributes() {
        return dynamicAttributes;
    }

    public void setDynamicAttributes(Map<String, String> dynamicAttributes) {
        this.dynamicAttributes = dynamicAttributes;
    }

    @Override
    protected int doTag() throws Exception {
        for (Map.Entry<String, String> dynamicAttribute : dynamicAttributes.entrySet()) {
            // do something
        }
        return 0;
    }
}

我想指出这些动态属性将由jsp中的手写入,而不是像Map一样传递${someMap}.有没有办法实现这个目标？

Answer 1

您必须在 TLD 中启用动态属性，如下所示：

<tag>
    ...
    <dynamic-attributes>true</dynamic-attributes>
</tag>

然后让你的标签处理程序类实现DynamicAttributes接口：

public class DynamicAttributesTag extends SimpleTagSupport implements DynamicAttributes {
    ...
    public void setDynamicAttribute(String uri, String localName, Object value) throws JspException {
        // This gets called every time a dynamic attribute is set
        // You could add the (localName,value) pair to your dynamicAttributes map here
    }
    ...
}