JEditorPaneHTMLEditorKitParserAround环绕

wen java案例 1

本文目录导读:

JEditorPaneHTMLEditorKitParserAround环绕

  1. 方案一:基础 HTML 解析器环绕
  2. 方案二:使用装饰器模式
  3. 方案三:完整的环绕解析器示例
  4. 使用说明

我理解您想要实现一个针对 JEditorPaneHTMLEditorKit 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

  1. 方案一:基础实现,重写 ParserCallback 方法来拦截解析过程
  2. 方案二:装饰器模式,更加灵活,可以包裹原始解析器
  3. 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。

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