package com.sprucetec.tms.fee.utils;
import java.util.HashMap;
import java.util.Map;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
* 配置文件或模板中的占位符替換工具類.
* Created by duyinqiang on 2016/12/12.
*/

public class PlaceholderUtils {

private static final Logger logger = LoggerFactory.getLogger(PlaceholderUtils.class);

/**
* 占位符前綴: "${"
*/
public static final String PLACEHOLDER_PREFIX = "${";
/**
* 占位符的后綴: "}"
*/
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= "我們都是好孩子,${num}說是嘛？ 我覺得${people}是傻蛋!";
Map<String, String> map = new HashMap<String, String>();
map.put("num","小二比");
map.put("people","衛強");
System.out.println(PlaceholderUtils.resolvePlaceholders(aa, map));
}

}

轉載于:https://www.cnblogs.com/duyinqiang/p/6206623.html

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