我正在向JTextPane添加一些基于html的格式化功能。想法是用户将在JTextPane中选择文本，然后单击按钮（粗体，斜体等）以在适当的位置插入html标记。我可以毫不费力地使用JTextPane.getSelectionStart（）和.getSelectionEnd（）方法。
我的问题是我还想扫描JTextPane中的每个字符以索引所有html标记位置 - 这样软件就可以检测到JTextPane插入符与html标记相关的位置。如果用户想要删除格式化标签，则使用此信息。 我在将此字符索引与JTextPane中的插入符位置同步时遇到困难。这是我一直在使用的代码：
public void scanHTML(){
try {
boolean blnDocStartFlag = false;
alTagRecords = new ArrayList(25);
alTextOnlyIndex = new ArrayList();
String strTagBuild = "";
int intTagIndex = 0; // The index for a tag pair record in alTagRecords.
int intTextOnlyCount = 0; // Counts each text character, ignoring all html tags.
// Loop through HTMLDoc character array:
for (int i = 0; i <= strHTMLDoc.length() -1; i ++){
// Look for the "<" angle bracket enclosing the tag keyword ...
if (strHTMLDoc.charAt(i) == '<'){// It is a html tag ...
int intTagStartLocation = i; // this value will go into alTagFields(?,0) later ...
while (strHTMLDoc.charAt(i) != '>'){
strTagBuild += strHTMLDoc.charAt(i);
i ++; // continue incrementing the iterator whilst in this sub loop ...
}
strTagBuild += '>'; // makes sure the closing tag is not missed from the string
if (!strTagBuild.startsWith("</")){
// Create new tag record:
ArrayList<Integer> alTagFields = new ArrayList(3);
alTagFields.add(0, intTagStartLocation); // Tag start location index ...
alTagFields.add(1, -1); // Tag end not known at this stage ...
alTagFields.add(2, getTagType(strTagBuild));
alTagRecords.add(intTagIndex, alTagFields); // Tag Type
System.out.println("Tag: " + strTagBuild);
intTagIndex ++; // Increment the tag records index ...
} else { // find corresponding start tag and store its location in the appropriate field of alTagFields:
int intManipulatedTagIndex = getMyOpeningTag(getTagType(strTagBuild));
ArrayList<Integer> alManipulateTagFields = alTagRecords.get(intManipulatedTagIndex);
alManipulateTagFields.set(1, (intTagStartLocation + strTagBuild.length() -1) ); // store the position of the end angled bracket of the closing tag ...
alTagRecords.set(intManipulatedTagIndex, alManipulateTagFields);
System.out.println("Tag: " + strTagBuild);
}
strTagBuild = "";
} else {
// Create the text index:
if (blnDocStartFlag == false){
int intAscii = (int) strHTMLDoc.charAt(i);
if (intAscii >= 33){ // Ascii character 33 is an exclamation mark(!). It is the first character after a space.
blnDocStartFlag = true;
}
}
// Has the first non space text character has been reached? ...
if (blnDocStartFlag == true){ // Index the character if it has ...
alTextOnlyIndex.add(i);
intTextOnlyCount ++;
}
}
}
} catch (Exception ex){
System.err.println("Error at HTMLTagIndexer.scanHTML: " + ex);
}
}
上面代码的问题是字符串变量 strHTMLDoc 是使用 JTextPane.getText 获得的，这似乎在字符串中插入了一些额外的空格字符。因此，这使其与文本窗格中的相应插入符号位置不同步。
有人可以提出另一种方法来实现我想要实现的目标吗？
非常感谢