jsp标记中的动态属性 [英] Dynamic attributes in a jsp tag

问题描述

我想要一个带有动态属性的标签，例如简单的html标签，例如 :

I want to have a tag with dynamic attributes, like simple html tags, e.g. something like this:

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

在我的代码实现中，我想要这样的东西:

And in my implementation of tag I want to have something like this:

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;
    }
}

我想指出的是，这些动态属性将由jsp手动编写，而不仅仅是像${someMap}这样作为Map传递.那么有什么办法可以做到这一点?

I want to point out that these dynamic attributes are going to be written by hands in a jsp, not just passed as Map like ${someMap}. So is there any way to achieve this?

推荐答案

您将必须在TLD中启用动态属性，就像这样:

You will have to enable dynamic attributes in your TLD, like so:

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

然后让您的标记处理程序类实现DynamicAttributes接口:

And then have your tag handler class implement the DynamicAttributes interface:

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
    }
    ...
}

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