如何从一个可选块中获取文本框的值，从jelly到java？

Question

我刚刚开始使用Jelly进行编码，我有一个问题： 我想打印我在文本框中写的值。文本框位于我检查的可选块中。但是当我想打印它的值时，它会打印＆＃34; null＆＃34;。我认为没有保存该值，或者我必须检查是否检查了checbox ... 以下是我的代码，感谢您的帮助

config.jelly

<f:block>
    <table>
        <f:optionalBlock name="toRemote" title="Remote">
            <f:entry title="Full parameter name">
                <f:textbox name="parameter_name" value="${it.parameter_name}"/>
            </f:entry>
        </f:optionalBlock>
    </table>
</f:block>

HelloWorldBuilder.java

public class HelloWorldBuilder extends Builder {

    private final String parameter_name;

    /**
     * This annotation tells Hudson to call this constructor, with
     * values from the configuration form page with matching parameter names.
     */
    @DataBoundConstructor
    public HelloWorldBuilder(String parameter_name) {
        this.parameter_name = parameter_name;
    }

    /**
     * We'll use this from the <tt>config.jelly</tt>.
     */
    public String getParameter_ame() {
        return parameter_name;
    }

    @Override
    public boolean perform(AbstractBuild build, Launcher launcher, BuildListener listener) throws IOException {
        // this is where you 'build' the project
        // since this is a dummy, we just say 'hello world' and call that a build

        listener.getLogger().println("Parameter name = " + parameter_name + "!");
        build.save();
        return true;
    }