java正则替换img标签中src值的方法

主要功能是： 替换html字符串中img标签src的值.

代码如下：

package com.junlenet.common.util;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class HtmlUtils {
	
	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("
");
 	content.append("
");
  System.out.println("原始字符串为:"+content.toString());
  String newStr = replaceHtmlTag(content.toString(), "img", "src", "src="http://junlenet.com/", """);
  System.out.println("  替换后为:"+newStr);
 } 
 
}

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