用java替换字符串中所有标签的最佳方法-bestwayofreplacingalltagsinastringwithjava

Basically you want to copy the execution of Matcher.replaceAll() like so:

基本上你想复制Matcher.replaceAll()的执行,如下所示:

public static String replaceTags(String message, Map tags) {
  Pattern p = Pattern.compile("#(\\w+)#");
  Matcher m = p.matcher(message);
  boolean result = m.find();
  if (result) {
    StringBuffer sb = new StringBuffer();
    do {
      m.appendReplacement(sb, tags.containsKey(m.group(1) ? tags.get(m.group(1)) : "");
      result = m.find();
    } while (result);
    m.appendTail(sb);
    message = sb.toString();
  }
  return message;
}

Note: I've made an assumption about the valid tag (namely \w in the regex). You will need to cater this for what's really valid (eg "#([\w_]+)#").

注意:我已经假设有效标记(即正则表达式中的\ w)。你需要为真正有效的东西提供这个(例如“#([\ w _] +)#”)。

I've also assumed the tags above looks something like:

我还假设上面的标签看起来像:

Map tags = new HashMap();
tags.add("firstName", "Skippy");

and not:

tags.add("#firstName#", "Skippy");

If the second is correct you'll need to adjust accordingly.

如果第二个是正确的,您需要相应调整。

This method makes exactly one pass across the message string so it doesn't get much more efficient than this.

这种方法只对消息字符串进行一次传递,因此它不会比这更有效。

Thanks for your help guys. Certainly learned more about java. Here is my solution. It is this way to support different looking tags and tags within tags:

谢谢你的帮助。当然更多地了解了java。这是我的解决方案。这种方式可以支持标签中不同的标签和标签:

private static String replaceAllTags(String message, Map tags)
{
    StringBuilder sb = new StringBuilder( message );
    boolean tagFound = false;
    /**
     * prevent endless circular text replacement loops
     */
    long recurrancyChecker = 5000;

    do
    {
        tagFound = false;
        Iterator it = tags.entrySet().iterator();
        while( it.hasNext() )
        {
            Map.Entry pairs = (Map.Entry) it.next();

            int start = sb.indexOf( pairs.getKey().toString() );

            while( start > -1 && --recurrancyChecker > 0 )
            {
                int length = pairs.getKey().toString().length();
                sb.replace( start, start + length, pairs.getValue().toString() );
                start = sb.indexOf( pairs.getKey().toString() );
                tagFound = true;
            }
        }
    }
    while( tagFound && --recurrancyChecker > 0 );
    return sb.toString();
}