本文目录导读：
我来详细解释一下 JEditorPane、HTMLEditorKit 和 HTML 解析搜索的相关算法。
JEditorPane 基本概念
JEditorPane 是 Swing 中的文本组件，可以显示和编辑多种格式的内容，包括 HTML 和 RTF。
JEditorPane editor = new JEditorPane();
editor.setContentType("text/html");
editor.setText(htmlContent);
HTMLEditorKit 与解析器
HTMLEditorKit 架构
HTMLEditorKit kit = new HTMLEditorKit(); editor.setEditorKit(kit);
获取文档和解析器
HTMLDocument doc = (HTMLDocument) editor.getDocument(); HTMLEditorKit.Parser parser = kit.getParser();
文本搜索算法实现
1 基础文本搜索
public class HTMLTextSearch {
// 简单文本搜索
public List<Integer> searchPlainText(JEditorPane editor, String keyword) {
List<Integer> positions = new ArrayList<>();
try {
HTMLDocument doc = (HTMLDocument) editor.getDocument();
String content = doc.getText(0, doc.getLength());
int index = 0;
while ((index = content.indexOf(keyword, index)) != -1) {
positions.add(index);
index += keyword.length();
}
} catch (BadLocationException e) {
e.printStackTrace();
}
return positions;
}
}
2 基于正则表达式的搜索
public class RegexHTMLSearch {
public List<Integer> searchWithRegex(JEditorPane editor, String regex) {
List<Integer> positions = new ArrayList<>();
try {
HTMLDocument doc = (HTMLDocument) editor.getDocument();
String content = doc.getText(0, doc.getLength());
Pattern pattern = Pattern.compile(regex, Pattern.CASE_INSENSITIVE);
Matcher matcher = pattern.matcher(content);
while (matcher.find()) {
positions.add(matcher.start());
}
} catch (BadLocationException e) {
e.printStackTrace();
}
return positions;
}
}
3 高级搜索算法 - 多线程搜索
public class ParallelHTMLSearch {
public List<Integer> parallelSearch(JEditorPane editor, String keyword, int numThreads) {
List<Integer> positions = Collections.synchronizedList(new ArrayList<>());
try {
HTMLDocument doc = (HTMLDocument) editor.getDocument();
String content = doc.getText(0, doc.getLength());
ExecutorService executor = Executors.newFixedThreadPool(numThreads);
int segmentSize = content.length() / numThreads;
for (int i = 0; i < numThreads; i++) {
int start = i * segmentSize;
int end = (i == numThreads - 1) ? content.length() : (i + 1) * segmentSize;
executor.submit(() -> {
int localIndex = start;
while ((localIndex = content.indexOf(keyword, localIndex)) != -1 && localIndex < end) {
positions.add(localIndex);
localIndex += keyword.length();
}
});
}
executor.shutdown();
executor.awaitTermination(1, TimeUnit.MINUTES);
} catch (Exception e) {
e.printStackTrace();
}
Collections.sort(positions);
return positions;
}
}
HTML 标签解析搜索
1 基于标签的搜索
public class TagBasedSearch {
// 搜索特定标签内的文本
public List<String> searchInTags(JEditorPane editor, String tag, String keyword) {
List<String> results = new ArrayList<>();
HTMLEditorKit.ParserCallback callback = new HTMLEditorKit.ParserCallback() {
boolean inTargetTag = false;
StringBuilder text = new StringBuilder();
@Override
public void handleText(char[] data, int pos) {
if (inTargetTag) {
String content = new String(data);
if (content.toLowerCase().contains(keyword.toLowerCase())) {
results.add(content.trim());
}
}
}
@Override
public void handleStartTag(HTML.Tag t, MutableAttributeSet a, int pos) {
if (t.toString().equalsIgnoreCase(tag)) {
inTargetTag = true;
}
}
@Override
public void handleEndTag(HTML.Tag t, int pos) {
if (t.toString().equalsIgnoreCase(tag)) {
inTargetTag = false;
}
}
};
try {
HTMLEditorKit kit = (HTMLEditorKit) editor.getEditorKit();
Reader reader = new StringReader(editor.getText());
kit.getParser().parse(reader, callback, true);
} catch (Exception e) {
e.printStackTrace();
}
return results;
}
}
2 属性搜索
public class AttributeSearch {
// 搜索特定属性的值
public List<String> searchAttributes(JEditorPane editor, String attribute) {
List<String> attributeValues = new ArrayList<>();
HTMLEditorKit.ParserCallback callback = new HTMLEditorKit.ParserCallback() {
@Override
public void handleStartTag(HTML.Tag t, MutableAttributeSet a, int pos) {
Object value = a.getAttribute(attribute);
if (value != null) {
attributeValues.add(value.toString());
}
}
};
try {
HTMLEditorKit kit = (HTMLEditorKit) editor.getEditorKit();
Reader reader = new StringReader(editor.getText());
kit.getParser().parse(reader, callback, true);
} catch (Exception e) {
e.printStackTrace();
}
return attributeValues;
}
}
搜索高亮功能
1 高亮搜索结果
public class SearchHighlighter {
public void highlightSearchResults(JEditorPane editor, String keyword, Color highlightColor) {
try {
HTMLDocument doc = (HTMLDocument) editor.getDocument();
String content = doc.getText(0, doc.getLength());
Highlighter highlighter = editor.getHighlighter();
highlighter.removeAllHighlights();
int index = 0;
while ((index = content.indexOf(keyword, index)) != -1) {
highlighter.addHighlight(index, index + keyword.length(),
new DefaultHighlighter.DefaultHighlightPainter(highlightColor));
index += keyword.length();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
2 自定义高亮样式
public class CustomHighlightPainter extends DefaultHighlighter.DefaultHighlightPainter {
public CustomHighlightPainter(Color color) {
super(color);
}
@Override
public Shape paintLayer(Graphics g, int offs0, int offs1,
Shape bounds, JTextComponent c, View view) {
Rectangle rect = bounds.getBounds();
g.setColor(getColor());
g.fillRoundRect(rect.x, rect.y, rect.width, rect.height, 5, 5);
return rect;
}
}
性能优化算法
1 缓存搜索
public class CachedSearch {
private Map<String, List<Integer>> searchCache = new HashMap<>();
private String lastContent = "";
public List<Integer> searchWithCache(JEditorPane editor, String keyword) {
try {
String currentContent = editor.getText();
// 如果内容没有变化，使用缓存
if (currentContent.equals(lastContent)) {
return searchCache.getOrDefault(keyword, new ArrayList<>());
}
// 内容变化，重新搜索并缓存
lastContent = currentContent;
searchCache.clear();
List<Integer> positions = searchPlainText(editor, keyword);
searchCache.put(keyword, positions);
return positions;
} catch (Exception e) {
e.printStackTrace();
return new ArrayList<>();
}
}
private List<Integer> searchPlainText(JEditorPane editor, String keyword) {
// 实现基本的文本搜索
return new ArrayList<>();
}
}
2 增量搜索
public class IncrementalSearch {
private int lastSearchIndex = 0;
private String lastKeyword = "";
public int incrementalSearch(JEditorPane editor, String keyword, boolean forward) {
try {
HTMLDocument doc = (HTMLDocument) editor.getDocument();
String content = doc.getText(0, doc.getLength());
int result = -1;
if (forward) {
result = content.indexOf(keyword, lastSearchIndex);
} else {
result = content.lastIndexOf(keyword, lastSearchIndex);
}
if (result != -1) {
lastSearchIndex = result + (forward ? keyword.length() : 0);
}
return result;
} catch (BadLocationException e) {
e.printStackTrace();
return -1;
}
}
}
完整搜索示例
public class HTMLSearchDemo {
public static void main(String[] args) {
JEditorPane editor = new JEditorPane();
editor.setContentType("text/html");
editor.setText("<html><body>" +
"<h1>标题</h1>" +
"<p>这是第一段文本内容</p>" +
"<a href='link1'>链接1</a>" +
"<p>这是第二段文本内容</p>" +
"</body></html>");
HTMLSearchEngine searchEngine = new HTMLSearchEngine(editor);
// 基础搜索
List<Integer> positions = searchEngine.basicSearch("文本");
// 高亮结果
searchEngine.highlightResults(positions, Color.YELLOW);
// 标签内搜索
List<String> paragraphContent =
searchEngine.searchInTag("p", "内容");
// 属性搜索
List<String> links =
searchEngine.searchAttribute("href");
}
}
这些算法和方法提供了完整的 HTML 内容搜索解决方案，可以根据具体需求选择合适的实现方式。
