如何在JTextArea中为文本生成html？ [英] How to generate html for text in JTextArea?
问题描述
我在为给定字符串生成html代码时遇到问题，该字符串来自
I have a problem in generating html code for a given string which is from
JTextArea textArea=new JTextArea(10,10);
String textToHtml=textArea.getText();
在此生成的html代码中，它应包含所有 html 标记与给定的字符串相关。
In this generated html code, it should contain with all html tags which are related to the given string.
喜欢< p>类似这样的< / p> ，< br> ; 等等。
此外，这不是一个Web应用程序。如果您有任何想法如何做到这一点。建议我。谢谢。
Like <p>something like this</p>, <br> and etc.
Also this is not a web application. If you have any idea how do this. Suggest me. Thanks.
更新
例如，如果我输入带换行符的文字，它应自动插入< br> 或< p> 。 Dreamweaver中提供了此类功能。当您开始填充网页中的内容时，它会自动插入代码。问题是，我不希望非技术性的用户在编写段落时输入HTML代码，因为默认情况下会插入
标签和所有内容。输入此文本后，我会直接向用户发送电子邮件，因此格式化非常重要。
For an example, if I type a text with line breaks, it should automatically insert <br> or <p>. This kind of function is available in Dreamweaver. It automatically inserts the code when you start filling the content in the webpage. The issue is so I don't want the non-technical usres to type the HTML code when they are writing paragraphs, because by default the
tag and all are inserted. I will be emailing this directly to the user after this text is typed, so this formatting is essential.
重要的是要注意我不知道用户是什么会打字，这完全取决于他。所以无论我使用什么方法应该能够识别它可以放置标签的地方（如段落标签）并继续前进
It is important to note that I don't know what the user will type, it is all upto him. so whatever the method I use should be capable of identfying the places where it could put tags (like paragraph tag) and move on
推荐答案
例如，如果我输入带换行符的文本，它应自动插入
< br>或< ; p>
基本要求是使用 DocumentFilter 在他们输入时输入你的标记
The basic requirement would be to use a DocumentFilter to inject your markup when ever they type enter
import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.text.AbstractDocument;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.DocumentFilter;
public class TestMarkup {
public static void main(String[] args) {
new TestMarkup();
}
public TestMarkup() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public static class TestPane extends JPanel {
public TestPane() {
setLayout(new BorderLayout());
JTextArea ta = new JTextArea(10, 20);
add(new JScrollPane(ta));
((AbstractDocument) ta.getDocument()).setDocumentFilter(new DocumentFilter() {
@Override
public void replace(DocumentFilter.FilterBypass fb, int offset, int length, String text, AttributeSet attrs) throws BadLocationException {
if (text.endsWith("\n")) {
super.replace(fb, offset, 0, "<br>", attrs);
offset += 4;
}
super.replace(fb, offset, length, text, attrs);
}
});
}
}
}
插入< p> / < / p> 可能会更难，但是，如果您认为第一行以< p> ，这只是在换行符和
Inserting <p>/</p> "might" be more difficult, but, if you assume that your first line starts with <p>, it's just a matter of inject </p> before the newline and <p> after it, then append the remaining text...
更新了段落支持和粘贴
显然我不能走开......
Apparently I just can't walk away...
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.util.StringJoiner;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.text.AbstractDocument;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;
import javax.swing.text.DocumentFilter;
import javax.swing.text.Element;
public class TestMarkup {
public static void main(String[] args) {
new TestMarkup();
}
public TestMarkup() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public static class TestPane extends JPanel {
public TestPane() {
setLayout(new BorderLayout());
JTextArea ta = new JTextArea(10, 20);
add(new JScrollPane(ta));
((AbstractDocument) ta.getDocument()).setDocumentFilter(new DocumentFilter() {
protected String getLastLineOfText(Document document) throws BadLocationException {
// Find the last line of text...
Element rootElem = document.getDefaultRootElement();
int numLines = rootElem.getElementCount();
Element lineElem = rootElem.getElement(numLines - 1);
int lineStart = lineElem.getStartOffset();
int lineEnd = lineElem.getEndOffset();
String lineText = document.getText(lineStart, lineEnd - lineStart);
return lineText;
}
@Override
public void replace(DocumentFilter.FilterBypass fb, int offset, int length, String text, AttributeSet attrs) throws BadLocationException {
if (text.length() > 1) {
String lastLineOfText = getLastLineOfText(fb.getDocument());
if (!lastLineOfText.startsWith("<p>")) {
if (!text.startsWith("<p>")) {
text = "<p>" + text;
}
}
// Replace any line breaks with a new line
String[] lines = text.split("\n");
if (lines.length > 0) {
StringJoiner sj = new StringJoiner("<br>\n");
for (String line : lines) {
sj.add(line);
}
text = sj.toString();
}
if (!text.endsWith("</p>")) {
text += "</p>";
}
super.replace(fb, offset, length, text, attrs);
} else {
String postInsert = null;
if (text.endsWith("\n")) {
// Find the last line of text...
String lastLineOfText = getLastLineOfText(fb.getDocument());
lastLineOfText = lastLineOfText.substring(0, lastLineOfText.length() - 1);
postInsert = "<p>";
if (!lastLineOfText.endsWith("</p>")) {
super.replace(fb, offset, 0, "</p>", attrs);
offset += 4;
}
}
super.replace(fb, offset, length, text, attrs);
if (postInsert != null) {
offset += text.length();
super.replace(fb, offset, 0, "<p>", attrs);
}
}
}
});
}
}
}
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