JxBrowser DOM API提供了允许计算 XPath 表达式的功能。您可以在DOMDocument 或指定的 DOMNode范围内计算XPath表达式 。DOMDocument 和的DOMNode实现 SearchContext 接口，提供了以下方法： * XPathResult evaluate（字符串表达式） * XPathResult evaluate（String表达式，XPathResultType类型） 示例代码： ``` DOMDocument document = browser.getDocument(); XPathResult result = document.evaluate("count(//div)"); ``` 评估结果存储在 XPathResult 对象中。首先，您需要确保结果不是错误并且评估已成功完成： ``` if (result.isError()) { System.out.println("Error: " + result.getErrorMessage()); return; } ``` 然后，您需要确保结果包含期望值类型（例如，Number，Boolean，String，DOMNode）并提取值本身： ``` if (result.isNumber()) { System.out.println("Result: " + result.getNumber()); } ``` 要么 ``` if (result.isString()) { System.out.println("Result: " + result.getString()); } ``` 要么 ``` if (result.isSingleNode()) { DOMNode node = result.getSingleNode(); System.out.println("Result: " + node.getTextContent()); } ``` ``` import com.teamdev.jxbrowser.chromium.Browser; import com.teamdev.jxbrowser.chromium.XPathResult; import com.teamdev.jxbrowser.chromium.dom.DOMDocument; import com.teamdev.jxbrowser.chromium.events.FinishLoadingEvent; import com.teamdev.jxbrowser.chromium.events.LoadAdapter; import com.teamdev.jxbrowser.chromium.swing.BrowserView; import javax.swing.*; import java.awt.*; /** * This sample demonstrates how to evaluate the XPath expression and work with the result. */ public class XPathSample { public static void main(String[] args) { final Browser browser = new Browser(); BrowserView browserView = new BrowserView(browser); JFrame frame = new JFrame(); frame.getContentPane().add(browserView, BorderLayout.CENTER); frame.setSize(800, 600); frame.setLocationRelativeTo(null); frame.setVisible(true); browser.addLoadListener(new LoadAdapter() { @Override public void onFinishLoadingFrame(FinishLoadingEvent event) { if (event.isMainFrame()) { DOMDocument document = browser.getDocument(); XPathResult result = document.evaluate("count(//div)"); // If the expression is not a valid XPath expression or the document // element is not available, we'll get an error. if (result.isError()) { System.out.println("Error: " + result.getErrorMessage()); return; } // Make sure that result is a number. if (result.isNumber()) { System.out.println("Result: " + result.getNumber()); } } } }); browser.loadURL("http://www.teamdev.com/jxbrowser"); } } ```