replaceall.java

新闻发布系统

package dsp.utils;

/**
 * <p>Title: DSP实验室</p>
 * <p>Description: DSP教学网
 *                 字符串替换
 * </p>
 * <p>Copyright: Copyright (c) 2004</p>
 * <p>Company: </p>
 * @author 李艳生
 * @version 1.0
 */

public class ReplaceAll {
	/** 字符替换函数
	 */
	public static String replace(String source,String oldString,String newString) {
		if(source == null)
			return null;
		StringBuffer output = new StringBuffer();
		int lengOfsource = source.length();
		int lengOfold = oldString.length();
		int posStart = 0;
		int pos;
		while((pos = source.indexOf(oldString,posStart)) >= 0) {
			output.append(source.substring(posStart,pos));
			output.append(newString);
			posStart = pos + lengOfold;
		}
		if(posStart < lengOfsource) {
			output.append(source.substring(posStart));
		}
		return output.toString();
	}
}