Java实现占位符名称替换值

import java.util.Map;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class StringFormatUtil {

     private static final Pattern pattern = Pattern.compile( "\\{(.*?)\\}" );

     private static Matcher matcher;

     private StringFormatUtil(){}

     /**

      * 格式化字符串 字符串中使用{key}表示占位符

      *

      * @param sourStr

      *            需要匹配的字符串

      * @param param

      *            参数集

      * @return

      */

     public static String format(String sourStr, Map<String, Object> param) {

         String tagerStr = sourStr;

         if (param == null )

             return tagerStr;

         try {

             matcher = pattern.matcher(tagerStr);

             while (matcher.find()) {

                 String key = matcher.group();

                 String keyclone = key.substring( 1 , key.length() - 1 ).trim();

                 Object value = param.get(keyclone);

                 if (value != null )

                     tagerStr = tagerStr.replace(key, value.toString());

             }

         } catch (Exception e){

             return null ;

         }

         return tagerStr;

     }

     //public static void main(String[] args) {

     //    String url = "https://xxx.com/cfes?c={campaign_name}&af_siteid={af_siteid}&clickid={clickid}&android_id={android_id}&advertising_id={advertising_id}&idfa={idfa}";

     //    Map<String, Object> map = new LinkedHashMap<>();

     //    map.put("campaign_name", "111");

     //    map.put("af_siteid", "222");

     //    map.put("clickid", "333");

     //    map.put("android_id", "444");

     //    map.put("advertising_id", "555");

     //    map.put("idfa", "");

     //    System.out.println(format(url, map));

     //}

}