一个替换java字符串中${}或者{}等占位符的工具类

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有时候,很多文本存入数据库或者文件中,某些变量或者模板中会存在占位符的情况,然而每次读取,一个个去字符串.replace去替换就很麻烦,于是写个占位符替换工具类

 

具体代码:

package com.flycms.core.utils;

import java.util.HashMap;
import java.util.Map;

import org.apache.commons.lang.math.NumberUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Open source house, All rights reserved
 * 版权:28844.com<br/>
 * 开发公司:28844.com<br/>
 *
 * @author sun-kaifei
 * @version 1.0 <br/>
 * @email 79678111@qq.com
 * @Date: 0:01 2018/9/8
 */

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 system 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("Could not resolve placeholder '" + placeholder + "' in [" + text + "] ");
                    }
                } catch (Exception ex) {
                    logger.warn("Could not resolve placeholder '" + placeholder + "' in [" + text + "]: " + ex);
                }
                startIndex = buf.indexOf(PLACEHOLDER_PREFIX, nextIndex);
            } else {
                startIndex = -1;
            }
        }
        return buf.toString();
    }

    public static void main(String[] args) {
        String aa= "我们都是好孩子,${num}说是嘛? 我觉得${people}是傻蛋!";
        Map<String, String> map = new HashMap<String, String>();
        map.put("num","小二比");
        map.put("people","小明");
        System.out.println(PlaceholderUtils.resolvePlaceholders(aa, map));
    }

}

 

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