htmlunit输入提交返回同一页

import com.gargoylesoftware.htmlunit.WebClient;
import com.gargoylesoftware.htmlunit.html.HtmlPage;
import com.gargoylesoftware.htmlunit.html.HtmlForm;
import com.gargoylesoftware.htmlunit.html.HtmlTextInput;
import com.gargoylesoftware.htmlunit.html.HtmlSubmitInput;

public class HtmlUnitExample {
    public static void main(String[] args) throws Exception {
        try (WebClient webClient = new WebClient()) {
            // 打开目标网页
            HtmlPage page = webClient.getPage("http://example.com");

            // 找到表单
            HtmlForm form = page.getFormByName("formName");

            // 找到输入框并设置值
            HtmlTextInput input = form.getInputByName("inputName");
            input.setValueAttribute("inputValue");

            // 找到提交按钮并点击
            HtmlSubmitInput submit = form.getInputByName("submitName");
            HtmlPage resultPage = submit.click();

            // 获取返回的页面内容
            String content = resultPage.asXml();
            System.out.println(content);
        }
    }
}