本文目录导读:

我理解您想要实现一个针对 JEditorPane 和 HTMLEditorKit 的 HTML 解析器环绕(Parser Around)功能,以下是几种实现方案:
基础 HTML 解析器环绕
import javax.swing.*;
import javax.swing.text.html.*;
import javax.swing.text.*;
import java.io.*;
public class JEditorPaneHTMLParserWrapper {
private JEditorPane editorPane;
public JEditorPaneHTMLParserWrapper() {
editorPane = new JEditorPane();
editorPane.setContentType("text/html");
editorPane.setEditable(true);
// 创建自定义 HTMLEditorKit
CustomHTMLEditorKit kit = new CustomHTMLEditorKit();
editorPane.setEditorKit(kit);
}
// 自定义 HTMLEditorKit
class CustomHTMLEditorKit extends HTMLEditorKit {
@Override
public ViewFactory getViewFactory() {
return new CustomHTMLFactory();
}
}
// 自定义 ViewFactory
class CustomHTMLFactory extends HTMLEditorKit.HTMLFactory {
@Override
public View create(Element elem) {
// 在创建 View 之前进行环绕处理
System.out.println("Creating view for: " + elem.getName());
return super.create(elem);
}
}
// 自定义 Parser 回调
class CustomParserCallback extends HTMLEditorKit.ParserCallback {
@Override
public void handleText(char[] data, int pos) {
System.out.println("Text: " + new String(data));
super.handleText(data, pos);
}
@Override
public void handleStartTag(HTML.Tag t, MutableAttributeSet a, int pos) {
System.out.println("Start Tag: " + t);
super.handleStartTag(t, a, pos);
}
@Override
public void handleEndTag(HTML.Tag t, int pos) {
System.out.println("End Tag: " + t);
super.handleEndTag(t, pos);
}
}
// 解析 HTML 字符串
public String parseHTML(String html) {
try {
CustomParserCallback callback = new CustomParserCallback();
HTMLEditorKit.Parser parser = new HTMLEditorKit().getParser();
// 这里的 Parse 方法需要特殊处理
StringReader reader = new StringReader(html);
parser.parse(reader, callback, true);
// 返回处理后的 HTML
return html;
} catch (Exception e) {
e.printStackTrace();
return html;
}
}
// 设置 HTML 内容
public void setHTML(String html) {
// 解析并处理 HTML
String processedHTML = parseHTML(html);
editorPane.setText(processedHTML);
}
}
使用装饰器模式
import javax.swing.text.html.*;
import javax.swing.text.*;
import java.io.*;
public class HTMLParserDecorator {
private HTMLEditorKit originalKit;
private JEditorPane editorPane;
public HTMLParserDecorator(JEditorPane editorPane) {
this.editorPane = editorPane;
this.originalKit = (HTMLEditorKit) editorPane.getEditorKit();
}
// 装饰后的 HTMLEditorKit
class DecoratedHTMLEditorKit extends HTMLEditorKit {
@Override
public void read(InputStream in, Document doc, int pos) throws IOException, BadLocationException {
// 在读取前处理
String html = new String(in.readAllBytes());
String processedHTML = processHTML(html);
// 使用处理后的 HTML
ByteArrayInputStream processedStream = new ByteArrayInputStream(processedHTML.getBytes());
super.read(processedStream, doc, pos);
}
@Override
public Document createDefaultDocument() {
// 创建自定义文档
return new CustomHTMLDocument();
}
}
// 自定义 HTML 文档
class CustomHTMLDocument extends HTMLDocument {
@Override
public HTMLEditorKit.ParserCallback getReader(int pos) {
return new CustomParserCallback(super.getReader(pos));
}
}
// 自定义 Parser Callback
class CustomParserCallback extends HTMLEditorKit.ParserCallback {
private HTMLEditorKit.ParserCallback original;
public CustomParserCallback(HTMLEditorKit.ParserCallback original) {
this.original = original;
}
@Override
public void handleText(char[] data, int pos) {
// 在文本处理前包裹
String text = new String(data);
System.out.println("Processing text at position " + pos + ": " + text);
// 可以在这里修改文本
original.handleText(data, pos);
}
@Override
public void handleStartTag(HTML.Tag t, MutableAttributeSet a, int pos) {
// 在标签开始前包裹
System.out.println("Processing start tag: " + t);
// 可以在这里修改属性
original.handleStartTag(t, a, pos);
}
@Override
public void handleEndTag(HTML.Tag t, int pos) {
// 在标签结束前包裹
System.out.println("Processing end tag: " + t);
original.handleEndTag(t, pos);
}
@Override
public void handleSimpleTag(HTML.Tag t, MutableAttributeSet a, int pos) {
System.out.println("Processing simple tag: " + t);
original.handleSimpleTag(t, a, pos);
}
@Override
public void handleComment(char[] data, int pos) {
System.out.println("Processing comment: " + new String(data));
original.handleComment(data, pos);
}
@Override
public void handleError(String errorMsg, int pos) {
System.out.println("Error at " + pos + ": " + errorMsg);
original.handleError(errorMsg, pos);
}
@Override
public void flush() throws BadLocationException {
System.out.println("Flush called");
original.flush();
}
}
// HTML 预处理方法
private String processHTML(String html) {
// 在这里实现您的 HTML 处理逻辑
// 添加、修改或删除标签
// 示例:在所有 <p> 标签周围添加 <div>
html = html.replaceAll("<p>", "<div class='paragraph-wrapper'><p>");
html = html.replaceAll("</p>", "</p></div>");
return html;
}
}
完整的环绕解析器示例
import javax.swing.*;
import javax.swing.text.html.*;
import javax.swing.text.*;
import java.awt.*;
import java.io.*;
public class HTMLParserAroundDemo extends JFrame {
private JEditorPane editorPane;
private JTextArea logArea;
public HTMLParserAroundDemo() {
setTitle("HTML Parser Around Demo");
setLayout(new BorderLayout());
// 创建编辑器面板
editorPane = new JEditorPane();
editorPane.setContentType("text/html");
JScrollPane editorScroll = new JScrollPane(editorPane);
// 创建日志面板
logArea = new JTextArea(10, 40);
JScrollPane logScroll = new JScrollPane(logArea);
// 分割面板
JSplitPane splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT, editorScroll, logScroll);
add(splitPane, BorderLayout.CENTER);
// 应用环绕解析器
applyParserWrapper();
// 设置示例 HTML
String sampleHTML = "<html><body><h1>Test</h1><p>Hello World</p></body></html>";
editorPane.setText(sampleHTML);
setSize(600, 400);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
}
private void applyParserWrapper() {
// 替换编辑器套件
editorPane.setEditorKit(new WrappedHTMLEditorKit());
}
// 包裹的 HTML 编辑器套件
class WrappedHTMLEditorKit extends HTMLEditorKit {
@Override
public Document createDefaultDocument() {
// 创建包裹的文档
return new WrappedHTMLDocument();
}
}
// 包裹的 HTML 文档
class WrappedHTMLDocument extends HTMLDocument {
@Override
public HTMLEditorKit.ParserCallback getReader(int pos) {
return new LoggingParserCallback(super.getReader(pos));
}
}
// 日志记录回调
class LoggingParserCallback extends HTMLEditorKit.ParserCallback {
private HTMLEditorKit.ParserCallback original;
private int elementCount = 0;
public LoggingParserCallback(HTMLEditorKit.ParserCallback original) {
this.original = original;
}
@Override
public void handleStartTag(HTML.Tag t, MutableAttributeSet a, int pos) {
elementCount++;
String msg = String.format("[%d] Start Tag: <%s> at position %d", elementCount, t, pos);
logArea.append(msg + "\n");
// 可以在这里修改属性
// a.addAttribute("data-wrapper", "true");
original.handleStartTag(t, a, pos);
}
@Override
public void handleEndTag(HTML.Tag t, int pos) {
String msg = String.format("[%d] End Tag: </%s> at position %d", elementCount, t, pos);
logArea.append(msg + "\n");
elementCount--;
original.handleEndTag(t, pos);
}
@Override
public void handleText(char[] data, int pos) {
String text = new String(data).trim();
if (!text.isEmpty()) {
logArea.append("Text: \"" + text + "\" at position " + pos + "\n");
}
original.handleText(data, pos);
}
@Override
public void handleSimpleTag(HTML.Tag t, MutableAttributeSet a, int pos) {
logArea.append("Simple Tag: <" + t + "/> at position " + pos + "\n");
original.handleSimpleTag(t, a, pos);
}
@Override
public void flush() throws BadLocationException {
logArea.append("--- Document Parsed ---\n");
original.flush();
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> new HTMLParserAroundDemo());
}
}
使用说明
- 方案一:基础实现,重写 ParserCallback 方法来拦截解析过程
- 方案二:装饰器模式,更加灵活,可以包裹原始解析器
- 方案三:完整示例,包含日志记录,便于调试
这些实现允许您在 HTML 解析的各个阶段插入自定义逻辑,实现"环绕"效果,您可以根据具体需求选择合适的实现方式。