java 정규img 태그의 src 값을 바꾸는 방법

package com.junlenet.common.util;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
 * html 
 * @author huweijun
 * @date 2016 7 13   7:25:09
 */
public class HtmlUtils {
	/**
	 *  
	 * @param str  
	 * @param tag  
	 * @param tagAttrib  
	 * @param startTag  
	 * @param endTag  
	 * @return
	 * @author huweijun
	 * @date 2016 7 13   7:15:32
	 */
	public static String replaceHtmlTag(String str, String tag, String tagAttrib, String startTag, String endTag) {
		String regxpForTag = "<\\s*" + tag + "\\s+([^>]*)\\s*" ;
		String regxpForTagAttrib = tagAttrib + "=\\s*\"([^\"]+)\"" ;
		Pattern patternForTag = Pattern.compile (regxpForTag,Pattern. CASE_INSENSITIVE );
		Pattern patternForAttrib = Pattern.compile (regxpForTagAttrib,Pattern. CASE_INSENSITIVE ); 
		Matcher matcherForTag = patternForTag.matcher(str);
		StringBuffer sb = new StringBuffer();
		boolean result = matcherForTag.find();
		while (result) {
			StringBuffer sbreplace = new StringBuffer( "<"+tag+" ");
		 Matcher matcherForAttrib = patternForAttrib.matcher(matcherForTag.group(1));
  	if (matcherForAttrib.find()) {
  		String attributeStr = matcherForAttrib.group(1);
  		matcherForAttrib.appendReplacement(sbreplace, startTag + attributeStr + endTag);
  	}
  	matcherForAttrib.appendTail(sbreplace);
  	matcherForTag.appendReplacement(sb, sbreplace.toString());
  	result = matcherForTag.find();
		}
		matcherForTag.appendTail(sb);   
		return sb.toString();
	}
 
 public static void main(String[] args) {
 	StringBuffer content = new StringBuffer();
 	content.append("<ul class=\"imgBox\"><li><img id=\"160424\" src=\"uploads/allimg/160424/1-160424120T1-50.jpg\" class=\"src_class\"></li>");
 	content.append("<li><img id=\"150628\" src=\"uploads/allimg/150628/1-15062Q12247.jpg\" class=\"src_class\"></li></ul>");
  System.out.println(" :"+content.toString());
  String newStr = replaceHtmlTag(content.toString(), "img", "src", "src=\"http://junlenet.com/", "\"");
  System.out.println("   :"+newStr);
 } 
 
}