替换html字符串中img标签src的值.

package com.junlenet.common.util;
 
import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
/**
 * html处理工具类
 * @author huweijun
 * @date 2016年7月13日 下午7:25:09
 */
public class HtmlUtils {
 
    /**
     * 替换指定标签的属性和值
     * @param str 需要处理的字符串
     * @param tag 标签名称
     * @param tagAttrib 要替换的标签属性值
     * @param startTag 新标签开始标记
     * @param endTag  新标签结束标记
     * @return
     * @author huweijun
     * @date 2016年7月13日 下午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("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);
    }