Java parses {variable names and text content replacement operations

/**

 * Get the list of variable names in the text according to the regular expression

 * @param pattern

 * @param content

 * @return

 */

public static List<String> getParams(String pattern, String content) {

 Pattern p = Pattern.compile(pattern);

 Matcher m = p.matcher(content);



 List<String> result = new ArrayList<String>();

 while (m.find()) {

 result.add(m.group(1));

 }

 return result;

}



/**

 * Replace the variables in the text with the actual data according to the regular expression

 * @param pattern

 * @param content

 * @param data

 * @return

 */

public static String parse(String pattern, String content, Map<String, String> data) {

 Pattern p = Pattern.compile(pattern);

 Matcher m = p.matcher(content);



 StringBuffer sb = new StringBuffer();

 while (m.find()) {

 String key = m.group(1);

 String value = data.get(key);

 m.appendReplacement(sb, value == null ? "" : value);

 }

 m.appendTail(sb);

 return sb.toString();

}



public static void main(String[] args) {

 String content = " Congratulations {{ full name }} Successful registration , Please show your registration number {[code]} Go to the scene and take part in activities ";

 String reg = "\\{\\{(.+?)\\}\\}";

 List<String> params = getParams(reg, content);

 System.out.println(params);



 Map<String, String> data = new HashMap<String, String>();

 data.put(" full name ", " Zhang Sanfeng ");

 data.put("code", "930118");

 String text = parse(reg, content, data);

 System.out.println(text);

}


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