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modelAttribute and commandName atributes in form tag in Spring

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查了一些源码，发现commandName其实是set get modelAttribute的org.springframework.web.servlet.tags.form.FormTag

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public class FormTag extends AbstractHtmlElementTag {

    //other codes

    /** The default attribute name: "command" */
    public static final String DEFAULT_COMMAND_NAME = "command";

        private String modelAttribute = DEFAULT_COMMAND_NAME;

    /**
     * Set the name of the form attribute in the model.
     * <p>May be a runtime expression.
     */
    public void setModelAttribute(String modelAttribute) {
        this.modelAttribute = modelAttribute;
    }

    /**
     * Get the name of the form attribute in the model.
     */
    protected String getModelAttribute() {
        return this.modelAttribute;
    }

    /**
     * Set the name of the form attribute in the model.
     * <p>May be a runtime expression.
     * @see #setModelAttribute
     */
    public void setCommandName(String commandName) {
        this.modelAttribute = commandName;
    }

    /**
     * Get the name of the form attribute in the model.
     * @see #getModelAttribute
     */
    protected String getCommandName() {
        return this.modelAttribute;
    }

    //other codes
}