Searching for words in textarea

问题

I am building a custom a find and replace in java. I browse a text file and load the contents in a textarea. Now I have a textBox, where I input a text that needs to be searched.

What is the best way to search the text. I know a way using string.indexOf(), but I also need highlighting. So please help me out.

回答1:

First of all read Text and New Lines for information on how to get the text to search.

Then to highlight the text your find you need to use a Highlighter. The code is something like:

Highlighter.HighlightPainter painter = 
    new DefaultHighlighter.DefaultHighlightPainter( Color.cyan );

int offset = text.indexOf(searchWord);
int length = searchWord.length();

while ( offset != -1)
{
    try
    {
        textPane.getHighlighter().addHighlight(offset, offset + length, painter);
        offset = text.indexOf(searchWord, offset+1);
    }
    catch(BadLocationException ble) { System.out.println(ble); }
}

回答2:

indexOf is the easiest way, but might not be the fastest way.

Why isn't indexOf working for you? You will get the index of the match, and you know the length of the match, so just highlight the text that matched.

回答3:

I am having the same problem with my text editor. I didn't use a highlighter though, I used

textArea.select(int i1, int i2); //where i1 is where your selection begins and i2 is where it ends.

also an easy way to find and replace is:

textArea.setText(textArea.getText().replaceAll(String string1, String string2));

回答4:

final String inputValue = JOptionPane.showInputDialog("Find What?");
final int l1 = jTextArea1.getText().indexOf(inputValue);
final int l2 = inputValue.length();

if (l1 == -1) {
    JOptionPane.showMessageDialog(null, "Search Value Not Found");
} else {
    jTextArea1.select(l1, l2+l1);
}

来源：https://stackoverflow.com/questions/5909419/searching-for-words-in-textarea