The placeholder replacement tool class in the configuration file or template, and the template tool class

The placeholder replacement tool class in the configuration file or template, and the template tool class

Sometimes, a lot of text is stored in a database or file, and some variables or templates may have placeholders. However, each read, strings are removed one by one. replace replacement is very troublesome, so a placeholder replacement tool class is written.

Code:

Import java. util. hashMap; import java. util. map; import org. slf4j. logger; import org. slf4j. loggerFactory;/*** Replace the tool class with a placeholder in the configuration file or template * Date: 15-5-8 * Time: */public class PlaceholderUtils {private static final Logger logger = LoggerFactory. getLogger (PlaceholderUtils. class);/*** Prefix for system property placeholders: "$ {" */public static final String PLACEHOLDER_PREFIX = "$ {";/*** Suffix for syst Em property placeholders: "}" */public static final String PLACEHOLDER_SUFFIX = "}"; public static String resolvePlaceholders (String text, Map <String, String> parameter) {if (parameter = null | parameter. isEmpty () {return text;} StringBuffer buf = new StringBuffer (text); int startIndex = buf. indexOf (PLACEHOLDER_PREFIX); while (startIndex! =-1) {int endIndex = buf. indexOf (PLACEHOLDER_SUFFIX, startIndex + PLACEHOLDER_PREFIX.length (); if (endIndex! =-1) {String placeholder = buf. substring (startIndex + PLACEHOLDER_PREFIX.length (), endIndex); int nextIndex = endIndex + PLACEHOLDER_SUFFIX.length (); try {String propVal = parameter. get (placeholder); if (propVal! = Null) {buf. replace (startIndex, endIndex + PLACEHOLDER_SUFFIX.length (), propVal); nextIndex = startIndex + propVal. length ();} else {logger. warn ("cocould not resolve placeholder '" + placeholder + "' in [" + text + "]") ;}} catch (Exception ex) {logger. warn ("cocould not resolve placeholder '" + placeholder + "' in [" + text + "]:" + ex);} startIndex = buf. indexOf (PLACEHOLDER_PREFIX, nextIndex);} else {s TartIndex =-1 ;}} return buf. toString ();} public static void main (String [] args) {String aa = "we are all good children, $ {num} said yes? I think $ {people} is dumb! "; Map <String, String> map = new HashMap <String, String> (); map. put ("num", ""); map. put ("people", "James"); System. out. println (PlaceholderUtils. resolvePlaceholders (aa, map ));}}

Output result:

We are all good children. What do we mean by Xiaoer? I think James is dumb.

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